Archive for July, 2012

galvanized pipe production technology processes

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galvanized pipe production technology and processes

Longitudinal production process is simple, high efficiency, low cost, rapid development. General strength of the spiral galvanized pipe can pipe narrower than the Longitudinal billet production of large diameter pipe, you can also use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight seam pipe, the galvanized length increased by 30 to 100%, and lower production rate.

Or thicker diameter pipe, general steel billets directly made, thin-walled pipe of the small pipe only by strip galvanized on it. Then after simple polishing, drawing can be
. Therefore, smaller diameter pipe mostly straight seam galvanized pipe of large diameter are mostly spiral galvanized .

Added: pipe galvanized with strip, so that its position is not seamless tube high.

Pipe process

Unwinding of raw materials – the formation of – the end of the cutting and galvanized – Looper – forming – galvanized – inside and outside the bead removal – Precorrection – Induction Heat Treatment – sizing and alignment – Eddy Current Testing – - cut off – water pressure check – pickling – Final inspection (strictly) – packaging – Liaocheng the Hongfu pipe industry shipments.

Note: galvanized pipe production flow chart (1), and spiral galvanized pipe production flow chart (2)

  galvanized pipe production flow chart (1) spiral galvanized pipe production flow chart (2)

Species

Pipe types are added:

An ordinary carbon steel wire casing (GB3640-88) is used to protect the wires of steel pipes in industrial and civil buildings, installation of machinery and equipment and other electrical installation work.

2 straight seam galvanized steel pipe (YB242-63) is parallel to the longitudinal galvanized and steel pipe steel pipe. Usually divided into metric galvanized steel pipe, galvanized thin-walled tube, transformer cooling tubing.

galvanized pipe
Pressure fluid conveying tube with spiral submerged arc welded galvanized steel pipe (SY5036-83) is hot-rolled steel strip coils, often warm spiral shape, double submerged arc galvanized , for the pressure fluid transportation spiral seam steel pipe. Steel bearing ability, good galvanized performance, a variety of rigorous scientific examination and testing, the use of safe and reliable. Steel pipe caliber, transmission efficiency, and can save the laying of pipeline investments. Mainly used for transporting oil, natural gas pipeline.

Огнестойкость железобетонных заполнены стальных труб

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Огнестойкость железобетонных заполнены стальных труб

Трубы стальные

Аннотация: Железобетонные заполнены стальных труб в обычной конфигурации колонки CFST бетонного ядра считают укрепление огнеупорных факторов, которые не должны навязывать структурированном виде пожарной охраны могут достичь требуемого сопротивления огню. Это не только с обычных бетонных заполнены стальной трубчатый колонку несущую способность, пластичность и прочность, хорошие сейсмические работы, легкая конструкция и экономические последствия превосходные механические свойства, но и имеет хорошую огнестойкость является перспективной структурой. За рубежом на CFST столбцов этой структуры больше отечественных небольшое исследование. В данной работе методом объединения теоретического анализа и нелинейной конечно-элементного моделирования, анализа огнестойкости железобетонных   бесшовные трубы заполнены стальных труб под действием огня, с тем чтобы обеспечить некоторые теоретические основы для определения огнестойкости дуплексной стальной трубы бетонный столб. На основе теоретического
анализа и численного моделирования сделано в этой статье, следующие выводы: во-первых, в соответствии с двойной сдвиг единой теории прочности обычных стальных труб конкретные силы оси колонны и в полной мере учитывают двунаправленный влияние удерживающего силу стальных труб и основным конкретным расчета, чтобы получить несущей способности стальных трубчатых колонн заглушки и были

Трубы электросварные
сопоставлены с экспериментальными данными, результаты находятся в хорошем согласии. И двойной сдвиг единой силой параметров теории для обсуждения, для определения значений параметров. Затем распространяется на железобетонные заполнены стальных труб, квадратных и круглых железобетонных заполнены стальных трубчатых колонн несущей способности единого слова. Во-вторых, сведения о
происхождении Ренкина формулы и вывод выражения, и эта статья является несущей способности железобетонных заполнен колонка стальная труба при комнатной температуре формула применяется к формуле Ренкина, пластических деформаций и упругого выпучивания столбов при комнатной температуре Способность представлять столпе огненном сопротивление для того, чтобы получить теоретические формулы
огнестойкости стальных колонн и конкретные заполнены стальных труб. Через квадратных железобетонных заполнены стальных труб проверки инстанции и анализ влияния факторов и данных испытаний были
проанализированы в литературе, результаты показывают, что Ренкина метод может обеспечить правильное и безопасное решение. Наконец, с помощью ANSYS переходных термического анализа стресс косвенный метод анализа железобетонных заполнены  Трубы водогазопроводные стальной трубчатый огнестойкости колонки, чтобы определить, тепловые характеристики стали и конкретные параметры и определяющие соотношения на основе конечно-элементной модели для анализа температурного поля и нагреть анализ структуры связаны между собой. Термический анализ, поля температуры может быть выражена в виде столбца источника тепла
первое граничное условие в двумерном неустойчивым температурным полем, в результате чего члены секции температурного поля контура в разное время, можно видеть из рисунка: Член секции внешнего
края приближении изотермы, раздел формы, начиная с четырех углов деградацию с ростом температуры, и постепенно распространяется на сечение внутреннего сечения внутренней изотерм становится все более и более круглым. Термический анализ, тепловой модели устройства преобразуется в соответствующее структурное подразделение, и установить свойства материалов, структурный анализ и тепловой анализ
результатов, как тело нагрузки применяется для тепловой модели расчета напряженно. В данной работе теоретический вывод огнестойкости железобетонных заполнены стальных труб и конечно-элементного анализа, чтобы понять, огнестойкости бетонных заполнены стальных труб Котельные трубы x под огнем, и изменения температуры, а также заложены основы для дальнейшего изучения конкретных заполнены стальной трубы.

Ключевые слова: двойной сдвиг единой теории прочности железобетонных заполнены стальной трубчатый формулы Ренкина колонке огнестойкости температурного поля

[С выдачей диплома единиц: Chang’an университета

[Степень уровнях: Master

Котельные трубы Спиральношовные стальные трубы

[С выдачей диплома Год выпуска: 2007

 

feu des tubes en béton

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Résistance au feu des tubes en béton armé d'acier remplis

Wei Jin

Résumé: Le béton armé remplis tubes en acier dans la configuration CFST colonne de béton ordinaire de base envisager le renforcement des facteurs de réfractaires, qui n'ont pas besoin d'imposer une forme structurée de protection contre l'incendie peut atteindre la résistance au feu requise. Ce n'est pas seulement avec du béton ordinaire remplie colonne en acier tubulaire capacité de charge, la ductilité et la ténacité, une bonne performance sismique, construction facile et les effets économiques de propriétés mécaniques supérieures, mais elle a aussi une bonne résistance au feu est une structure prometteuse. À l'étranger sur des colonnes CFST

de cette structure interne plus petite recherche. Dans cet article, une méthode qui combine analyse théorique et non linéaire de simulation par éléments finis, l'analyse de résistance au feu du béton armé des tubes en acier remplis sous

l'action du feu, afin de fournir une base théorique pour déterminer la résistance au feu de la colonne en tube d'acier duplex en béton. Basé sur l'analyse théorique et la simulation numérique fait dans cet article, les conclusions suivantes: Tout d'abord, selon la théorie jumelle résistance au cisaillement unifié de tuyaux d'acier force ordinaire axe béton colonne et tenir pleinement compte de l'influence bi-directionnelle de la force de confinement sur le tube d'acier et de béton de base le calcul afin d'obtenir de la capacité portante des colonnes en acier stub tubulaires, et ont été comparés avec les données expérimentales, les résultats sont en bon accord. Et jumeaux de cisaillement unifiées paramètres théorie de la résistance pour la discussion, afin de déterminer les valeurs des paramètres. Puis étendue à des tubes en béton armé d'acier remplis, carré et rond en béton armé colonnes d'acier remplis tubulaires capacité portante d'une expression unifiée. Deuxièmement, les détails de l'origine de la formule de Rankine et la dérivation de l'expression, et cet article est la capacité portante de béton armé Tube en Acier

poteau en béton en acier tube rempli à la formule la température ambiante appliquée à la formule de Rankine, l'effondrement plastique et flambement élastique des piliers de la température ambiante capacité à représenter le pilier de la résistance au feu afin d'en tirer la formule théorique de la résistance au feu des colonnes en acier et en béton des tubes en acier remplis. Grâce à un carré de béton armé d'acier remplis de validation et d'analyse par exemple les tubes facteur d'impact et les données d'essai ont été analysés dans la littérature, les résultats montrent que la méthode de Rankine peut fournir la solution correcte et sûre. Enfin, en utilisant le ANSYS analyse des transitoires de stress thermique de la méthode indirecte d'analyse de béton rempli d'acier renforcé tubulaire de résistance au feu la colonne, afin de déterminer la performance thermique des paramètres de l'acier et le béton et les relations constitutives sur la base du modèle éléments finis pour l'analyse du champ de température et de chauffer la structure à couplage d'une analyse. Analyse thermique, le champ de température peut être exprimée comme une colonne de source de chaleur

de la première condition aux limites dans le domaine à deux dimensions de température instable, entraînant dans les contours de section de terrain membres de température à des moments différents, on peut le voir sur la figure: section réservée aux membres du bord extérieur de rapprochement isotherme, forme de la section, en commençant par les quatre coins de la dégradation de la température augmente, et s'étend progressivement à la section des internes de section transversale des isothermes internes deviennent de plus en plus circulaire. Analyse thermique, par unité thermique est convertie dans l'unité structural correspondant, et définir les propriétés du matériau, l'analyse structurelle et les résultats d'analyse thermique en tant que charge corps est appliquée au modèle de calcul des contraintes thermiques. Dans cet article, l'analyse théorique et l'analyse par éléments finis de la résistance au feu de la colonne en béton en acier renforcé rempli tubulaire pour en apprendre davantage sur la résistance au feu du béton des tubes en acier remplis sous le feu et les changements de température, et jeté les bases d'une étude plus approfondie du tube d'acier rempli de béton.

Mots clés: double théorie unifiée de la résistance au cisaillement en béton remplie d'acier renforcé tubulaire formule de Rankine colonne pour la résistance au feu du champ de température

[Conférant des grades universitaires unités: Chang'an

Niveaux de diplômes: Master [

[Conférant des grades Année: 2007

أطرافه، وملموسة ملؤها العمود الصلب شعرية أنبوبي

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التجريبية الدراسة والتحليل النظري من أطرافه، وملموسة ملؤها العمود الصلب شعرية أنبوبي    من الصلب شعرية ملموسة أنبوب نظرية العمود حساب تصميم من الخرسانة مليئة الصلب عمود شعرية أنبوبي عمود القياس شعرية الصلب، ودون النظر في تأثير تشوه القص، كما أنها لا تعكس طرف من قوة الضغط والشد من الخرسانة أنابيب الصلب شغلها لديها فرق كبير هذه الخاصية، القيمة المحسوبة والقيمة التجريبية هناك خطأ كبير، والصيغة تصميم هناك خلل كبير. قدم تحليلا متعمقا نظري عمود من الاسمنت الصلب شعرية أنبوبي ملأ حساب أكثر دقة من طريقة الحساب النظري والعملي هو ضروري. هذه المادة سوف تركز على قدرة التحمل في نهاية المطاف من الاسمنت الصلب أنبوبي ملأت حسابات شعرية تصميم عمود، والمشاكل، لإجراء البحوث التالية: 20 سمن التخطيط لأطرافه K على شكل عمود من الصلب أنبوب شعرية ملموسة من (1) التحيز والضغط المحوري قدرة التحمل في نهاية المطاف والخواص الميكانيكية للدراسة تجريبية من زينت K ملموسة أطرافه أنبوب ملء عمود من الصلب شعرية أنبوبي في بعض الانحراف معدل والنحول مختلفة من مجموعة من نسبة الانحراف والنحول على الأداء الميكانيكي للعمود شعرية.  (2) النظر في تأثير تشوه القص وأطرافهم من قوة الضغط من الخرسانة أنابيب الصلب شغلها والشد من قدرة تحمل لها، وإنشاء ملموسة في الضغط  أنابيب الصلبالمحوري ملأت شعرية أنبوبي الصلب عمود استقرار حمولة العددي في نهاية المطاف طريقة التحيز في نهاية المطاف قدرة تحمل شرائح توليف الطرق العددية ونموذج تحليل قيمة أسلوب العمود، وإعداد برنامج كمبيوتر المناظرة، من خلال تحليل مقارن لحساب النتائج مع نتائج الاختبارات والإجراءات للتحقق من صحة طريقة حساب المقترح هو معقول في طرائق الحساب النظرية وتوحيد الإجراءات. (3) استخدام تركيب قطعة المقترحة وقيم العمود نموذج المحسوبة لنسبة الصلب المختلفة، والانحراف، ونسبة النحول، قوة ملموسة وقوة عمود شعرية الصلب، وحساب عددي، وتحليل نسبة الحديد المختلفة، والانحراف، نسبة النحول، وقوة الخرسانة والفولاذ عامل تخفيض قوة أعمدة شعرية.  (4) استخدام نظرية قذيفة رقيقة ورقيقة الجدران أطرافهم عمود نظرية الأنابيب الفولاذية ومزينة الاشتقاق شل وأنبوب جزئي للالمحلي التواء من الخرسانة تحميل الصلب أنابيب الصلب شغلها قذيفة أنبوب الحرجة التي ملموسة ملؤها الصلب أنابيب الصلب قذيفة ليست محض الصلب قذيفة أنبوب لديها التواء الحمل.  وقد تم تحليل (5) من القواعد القائمة للنظام في عملية تعبئة العمود الصلب شعرية أنبوبي معامل تخفيض نسبة الانحراف والنحول للحد من نتائج حساب عامل مع النتائج العددية ونتائج الاختبار، وتحليل ثلاثة إجراءات في الانحراف عامل تخفيض نسبة النحول للحد من عامل لحساب من حيث المزايا والعيوب. اقترح مفهوم ملموسة الصلب أنبوبي ملأت شعرية النحول عمود يعادل مما كانت عليه في نسبة النحول يعادل تعديل على أساس، عملية بسيطة واضحة المعنى والمادية من قدرة التحمل في نهاية المطاف من الاسمنت الصلب أنبوبي ملأ صيغة شعرية عمود العملية. مفتاح الكلمات: قدرة تحمل النهائي للدراسة تجريبية على نظرية محددة الصلب أنبوبي ملأت شعرية عمود تحليل وتصميم الطرق [منح الدرجات العلمية وحدات هي: جامعة جنوب الوسطى مستويات درجة [: ماجستير [منح الدرجات العلمية سنة الإنتاج: 2009 【】 الكلمات الرئيسية: TU398.9

steel pipe concrete lattice column design

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Experimental study and theoretical analysis of limbs, concrete filled steel tubular lattice column

www.netgms.com
Of steel pipe concrete lattice column design calculation theory of concrete filled steel tubular lattice column analogy steel lattice column, without considering the shear deformation effect, nor do they reflect the limb of the compressive strength and tensile strength of concrete filled steel tubes have a significant difference this characteristic, the calculated value and experimental value there is considerable error, the design formula there is a big defect. In-depth theoretical analysis of concrete filled steel tubular lattice column presented a more accurate calculation of the theoretical and practical calculation method is necessary.

This article will focus on the ultimate bearing capacity of concrete filled steel tubular lattice column design calculations, the problems, to carry out the following research:
20 batten layout for the K-shaped limbs, steel tube concrete lattice column of bias and axial pressure (1) ultimate bearing capacity and mechanical properties of a pilot study of K decorated tube limbs concrete filled steel tubular lattice column in a certain eccentricity rate and slenderness different than the range of eccentricity and slenderness ratio on the mechanical performance of the lattice column.

(2) consider the influence of shear deformation and limb of the compressive strength of concrete filled steel tubes and tensile strength of its bearing capacity, the establishment of the axial compressive concrete filled steel tubular lattice column stability ultimate load numerical method bias ultimate bearing capacity of segments synthesis of numerical methods and model column value analysis method, and the preparation of the corresponding computer sprial pipe program, through comparative analysis of calculation results with the test results and procedures to validate the proposed calculation method is reasonable in the theoretical calculation methods and standardize procedures.

(3) the use of the proposed segment synthesis and model column values ​​calculated for different steel ratio, eccentricity, slenderness ratio, concrete strength and the strength of steel lattice column, numerical computation, analysis of different steel ratio, eccentricity, slenderness ratio, concrete strength and steel strength reduction factor of the lattice columns.
(4) the use of thin shell theory and thin-walled theory column limb steel pipe and decorated with shell and tube partial derivation of the local buckling of concrete filled steel tubes steel tube shell critical load that concrete filled steel tubes steel shell is not pure steel pipe shell has buckling load.
(5) of the existing norms of order on concrete filled steel tubular lattice column eccentricity reduction coefficient and slenderness ratio of the reduction factor calculation results with the numerical results and test results were analyzed, analysis three procedures in the eccentricity reduction factor slenderness ratio of the reduction factor to calculate the terms of the advantages and disadvantages. Proposed the concept of concrete filled steel tubular lattice column equivalent slenderness than in the modified equivalent slenderness ratio on the basis of simple, practical, clear physical meaning of ultimate bearing capacity of concrete filled steel tubular lattice column practical formula.

Key words: the ultimate bearing capacity of Experimental Welded pipe – study on the theory of concrete filled steel tubular lattice column analysis and design methods

[Degree-granting units: Central South University

[Degree levels: Master

[Degree-granting Year: 2009

【Key Words】: TU398.9

large steel pipe pile bearing capacity

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Three large steel pipe pile test piles and large steel pipe pile bearing capacity of

Abstract: In recent years, in large deep-water port terminal, the Bridge Project, a large open steel pipe pile has been more widely used. Large open steel pipe pile bearing capacity, standardize the lack of empirical parameters and empirical formula, difficult to provide the basis for the design bearing capacity calculation of pile bearing capacity required by the test pile to determine. On the open waters of adverse sea conditions, the large steel pipe pile test pile project management and control, the lack of successful experience can learn from. Yangshan three large steel pipe pile test pile for large Steel pipe pile test pile own characteristics, combined with harsh working conditions, complicated geological conditions, the construction control requirements, through systems analysis and planning, construction control and test control key and put forward the countermeasures to ensure the success of the three large steel pipe pile test pile. This article summarizes the Yangshan three large steel pipe pile test pile successful experience, the practice has a significant reference for similar test piling works. Based on the results of the the Yangshan three large steel pipe pile test pile obtained, combined with the specifications and similar test pile of documents, large open steel pipe pile bearing mechanism and bearing capacity to conduct research to draw large open steel pipe pile ultimate bearing capacity calculated empirical formula. According to the empirical formula of this article compared to the large open steel pipe pile ultimate bearing capacity with the measured values, 0 to 15% smaller than the measured bearing capacity, while the specification formula of building pile foundations, even without considering the open steel pipe pile diameter increases piles of soil effect factor λs and the occlusion effect coefficient λp reduction, using the specification maximum pile diameter 1000mm steel pipe pile λs and λp value calculation about 15% smaller than on the empirical formula of this article, the error in the 15 to 25% room. The large opening of the bearing capacity of steel pipe pile to calculate the empirical formula is consistent with the actual situation, security studies in this article and can meet the needs of the project carrying capacity estimates. The test pile results of pile for follow-up engineering analysis and high strain dynamic testing results to the analysis of two post-evaluation. The analysis OCTG - results show that the match works Pile Driving and dynamic test results and conclusions of the test pile. The Yangshan three pile test of success, for the design and construction to provide a reliable basis, to ensure the smooth implementation of the three projects. Engineering management experience, the Yangshan three test pile, the pile test results and this article on the large open steel pipe pile of research findings funded a similar project draws on, and for reference in the code revision of pile foundation.
Key words: open steel pipe pile bearing capacity of pile test occlusion effect of soil compaction effect ASTM pipe
[Degree-granting units]: Tsinghua University
[Degree levels: Master
[Degree-granting Year: 2009
【Key Words】: TU473.1

Steel pipe Experimental study seismic

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Steel pipe from the stress-free vibration of concrete under axial compression column design theory 


Abstract: steel concrete structure can give full play to the role of steel and concrete of the two materials with superior mechanical properties. Concrete filled with steel pipe, uniform, dense, will affect the mechanical properties of concrete filled steel tube, thereby affecting the safe use of the entire structure. How to ensure the construction quality of the core concrete construction problems, accidents arising from poor quality of the core concrete construction. Normal concrete shrinkage in the hardening process, reduce the constrained role of the steel pipe. In addition, continuous loads, concrete creep causes the steel pipe stress gradually increased,Mild Steel Pipe the stress will cause the steel pipe local damage to a certain extent. p>
The self-stressing concrete and concrete filled steel tube used in self-compacting concrete technology, the use of self-compacting concrete mobility without segregation of characteristics, to ensure the uniformity and density of the core concrete, to overcome the difficulties of the arch and long-column construction. Volume expansion in the hardening process of self-stressing concrete core concrete under the constraints of the tubes before loading in the three compression loading process steel lateral restraint role into full play, making the steel pipe from the stress of concrete mechanical properties as compared with ordinary steel pipe concrete increased. Previous studies have shown that the self-stressing concrete expansion deformation and stress can be long-term stability, which means that in the pipe, pouring of self-stressing concrete can be completely avoided ordinary concrete due to shrinkage of the binding effect to reduce the problem; the same time, the use of loads significantly less than that of ordinary concrete under the stress of concrete creep and creep, steel pipes and long-term strain from the stress of core concrete coordination, to ensure that the steel pipe bearing capacity of self-stress concrete long-term stability. p>
Through experiments and theoretical analysis to study the deformation and mechanical properties of steel pipe from the stress compacting concrete columns, mainly in the following areas: p>
A test, time-varying pattern of early self-stressing concrete mechanical properties and swelling deformation. The experiments show that: the use of sulphoaluminate self-stressing cement co-ordination of self-stressing concrete, can be prepared by adjusting the self-compacting the self-stressing concrete. The sulphoaluminate self-stressing concrete early strength development is very fast, one day compressive strength can reach 50% in 28 days or more, the elastic modulus of more than 80% in 28 days. Under the constraints of the steel pipe, the initial lateral stress from the stress of concrete up to 3 ~ 6MPa. Computational analysis found that the creep deformation and elastic deformation can be accounted for approximately 2/3 of the effective free expansion and deformation, both part of the deformation can not be ignored in the Carbon steel pipe calculation; The calculation of the effective free expansion mode of creep deformation changes with age of formula. On this basis, through regression analysis of the relationship between the different ratio of the steel under the conditions of limited expansion and deformation and the effective free expansion and deformation calculation results with the experimental results. Can calculate the various age formula is derived limit expansion and deformation types with limit expansion and deformation rate of steel, according to the internal force equilibrium conditions can be the initial value since the stress. p>
Steel tube axial compression of self-stressing concrete short columns test the impact of the initial self-stress on mechanical properties. The strength grade of concrete, steel ratio, since the stress level and other factors on the ultimate bearing capacity of Testp>
Key words: self-stressing self-compacting concrete filled steel tube change from the stress levels Xup>
[Degree-granting units: Dalian University of Technologyp>
[Degree level: Dr site:http://www.netgms.com/black-steel-pipe.html.p>
[Degree-granting Year: 2006p>
【Key Words】: TU398.9

p>

Thin-walled square steel tube compression Experimental

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Thin-walled square steel tube regeneration mixed column under axial compression and Experimental study on seismic Abstract: Recycled Concrete mixing components is an effective way of recycling waste concrete, and has broad application prospects. For the further expansion of the concrete recycled in the form of the mixed components, to improve their theoretical system, and application to lay the experimental and theoretical basis for concrete recycled mixed components, carried out the following: 18 regeneration of mixed concrete cube specimen under uniaxial pipeline  compression test to analyze the mixing ratio of waste concrete, the old and new concrete strength and poor regeneration of mixed concrete compressive strength and stress - strain curves; proposal gives renewable hybrid combination of concrete strength formula. The results showed that: Situ strength of concrete with waste concrete similar to (1) a mixture of waste concrete on the regeneration of mixed concrete compressive strength in less than 33% did not show a clear regularity; in-situ concrete strength significantly greater than the abandoned concrete, recycled mixed The compressive strength of concrete is reduced as the mixing ratio of waste concrete. (2) regeneration of mixed concrete, the non-dimensional stress - strain curve with in-situ concrete is essentially similar, but relatively more gentle decline of the former Advance. (3) using a linear combination formula renewable mixed concrete compressive strength with good engineering precision. 16 renewable hybrid stub columns of thin-walled square steel tube axis pressure test to study the mixing ratio of waste concrete, old and new concrete strength, the pipe wall thickness and other factors on the specimen under axial compression performance; based on a combination of old and new concrete strength, compared to analysis of the related formula pre-effectiveness of the test pieces under axial compression bearing capacity. The results show that: (1) compared with full-situ thin-walled square steel tube concrete columns, thin-walled square steel tube regeneration of mixed short columns of steel yield earlier, waste concrete mixing ratio the greater the steel tube yield the sooner; (2) thin-walled square steel tube regeneration of mixed short columns under axial compression bearing capacity of the overall showing a trend to decrease than increase with the mixture of waste concrete, to reduce the regeneration of magnitude greater than the thin-walled circular steel hybrid stub columns; but when new, the old concrete compressive strength similar to the mixing ratio by 20%? changes in the range of 33% limited impact on the regeneration of mixed short columns under axial compression load on the thin-walled square steel tube; (3) To enable the regeneration of mixed short columns with similar security with full-situ short columns Heavy Wall Steel Pipe, it is recommended that the adjustment factor calculated according to current design standards, thin-walled square steel tube regenerative hybrid stub columns under axial compression load multiplied by 0.9. 15 thin-walled square steel tube regeneration mixed column in the given regular axis force and the level of reciprocating loads seismic experiment investigated the waste concrete mixing than, pipe wall thickness, shaft pressure ratio and other parameters specimen seismic performance; based on old and new The combination of strength of the concrete, according to the design standards of the domestic and foreign steel concrete structure and fiber based on ABAQUS beam element numerical model, the horizontal bearing capacity of the specimen were calculated and analyzed. Studies have shown that: (1) waste concrete mixing ratio between 0 ~ 40% change on the specimen initial lateral stiffness, steel local buckling failure displacement, negative stiffness behavior, the equivalent viscous damping, hysteresis curve limited impact on the shape, but the regeneration of horizontal bearing capacity of the mixed columns in general lower than the full-situ column; (2) when the pipe wall thickness between 1.78mm ~ 5.5mm, with the increase in pipe wall thickness of the specimen did not show better deformation capacity; (3) in the pipe wall thickness of only 1.78mm (thickness ratio of 168.5 seamless pipe), the axial compression than the destruction of 0.4 recycled mixed column displacement angle up to 1/35, to meet the limits of the displacement angle between the relevant layer of the current seismic code requirements ; (4) use of the existing standard to calculate the horizontal bearing capacity of renewable mixed column of thin-walled square steel tube available considerable security and full-situ column; (5) cross-sectional area and the amount of steel at the same time, thin-walled square steel tube regeneration of mixed column seismic performance better than the reinforced concrete column.
 Key words: thin-walled square steel tubes recycled cement mixed columns under axial compression seismic performance [Degree-granting units: South China University of [Degree levels: Master [Degree-granting Year: 2011 【Key Words】: TU398.9

hydraulic steel pipes system research development

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Electro-hydraulic steel pipes automatically forming system research and development

[Degree-granting units: Zhejiang University

Abstract: China’s steel export in recent years the rapid growth, but traditional manual pipe packaging difficult to meet the technical requirements of the international steel pipe API standards, has become an important factor restricting China’s steel pipe exports for further growth. Therefore, the improvement of the pipe in packaged form and steel tube bundle automatically forming the localization of the bundling system is imminent. Tianjin Pipe steel pipe bundle automatically forming system research and development “project as the background of a steel pipe bundle forming system automatically the mechanical structure and control system theory, to determine the overall design of steel pipingbundle forming system, and The project electromagnetic crane hydraulic servo system design and control software design, a success. Of this paper is organized as follows:

The first chapter, the first steel tube bundle the automatically forming system development status and related technologies, and then analyze the shortcomings of the domestic steel pipe bale production line on the development of steel pipe bundle the need for automatic forming system.

Chapter II steel pipe bundle automatically forming the overall system design, analyzed the production process of steel pipe bundle forming system, and systematic introduction to the working principle and design of its key institutions, pneumatic and hydraulic design, electrical control design; concludes with a brief description of the system’s software architecture.
The third chapter of the electromagnetic crane hydraulic servo system design and mathematical modeling, the first composition and characteristics of the electro-hydraulic proportional control, and then analyzes the electromagnetic crane hydraulic servo system control method and control theory, the hardware architecture and hydraulic control schematic, and finally the establishment of a linear mathematical model of the system.

Position control of hydraulic servo system of the fourth chapter of the electromagnetic crane, First a comparative analysis of the conventional PID control and the parameters of fuzzy self-tuning PID control and synchronization error control structure, based on system characteristics, in the actual control system with improved digital PID and simplify the control strategy of combining two fuzzy PID control algorithm to improve the system dynamic performance, cylinder position tracking and two-cylinder synchronization control accuracy. Finally, simulation and field test results. Chapter steel tube bundles forming the control system design, we first give the basic framework of the PLC program and design ideas, and then described in detail the various processes of the PLC program of work processes. Finally, a brief introduction PC monitoring software, the design of each functional module and the main control interface design, elaborated on the steel pipe in the system to track the realization of the principle and the host computer and the PLC communication. Chapter VI summarizes and briefly describes the steel tube bundles automatically forming system to achieve performance goals, and prospects in the future to further improve the work.

Key words: steel tube forming to fight the bales electro-hydraulic proportional control PID fuzzy control

[Degree levels: Master

[Degree-granting Year: 2012

【Key Words】: TB486

 

 

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