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Effects of material variability on the ductility of composite beams and overstrength coefficients

机译：材料变异性对复合材料梁延性和超强度系数的影响

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摘要

The aim of this paper is to investigate the plastic rotation capacity of composite beams as well as the over-strength factors for composite joints considering the actual European steel production. It relies on the statistical data of the mechanical properties of steel profiles and reinforcement bars produced in several European steel mills that have been collected during the European research project OPUS. Several steel and composite structures have been designed following the EN 1998 rules, and the effect of the statistical distribution of the steel properties on the design has been analyzed. In such structures, the first attainment of the rotation capacity is expected to happen in the hogging region. The plastic rotation capacity was evaluated using the so-called standard beam concept. The moment-rotation curve was constructed by joining together the pre-buckling branch, determined using a fiber model, and the post-buckling part derived by considering the local plastic failure mechanism as suggested by Gioncu. A program in MATLAB (MATLAB version 7.10.0. Natick, Massachusetts: The MathWorks Inc., 2010) was developed to establish such curve for arbitrary composite beams. The predictions of the model compare favorably against the experimental results. On the basis of the probabilistic model for the mechanical properties of steel, we derive the statistical distribution of the maximum rotation defined at the intersection of the pre-buckling and post-buckling curves. Next, we estimate the so-called overstrength factors.
机译：本文的目的是研究考虑欧洲实际钢产量的复合梁的塑性旋转能力以及复合节点的超强度因素。它依赖于在欧洲研究项目OPUS期间收集的几家欧洲钢厂生产的钢型材和钢筋的机械性能的统计数据。按照EN 1998规则设计了几种钢结构和复合结构，并分析了钢特性统计分布对设计的影响。在这样的结构中，旋转能力的首次获得预计将在叉齿区域中发生。使用所谓的标准梁概念来评估塑料旋转能力。弯矩-旋转曲线是通过将使用纤维模型确定的预屈曲分支与考虑了Gioncu建议的局部塑性破坏机制而得出的后屈曲部分连接在一起而构建的。开发了MATLAB中的程序（MATLAB版本7.10.0，马萨诸塞州内蒂克：MathWorks Inc.，2010年）以建立任意复合梁的曲线。该模型的预测与实验结果相比具有优势。基于钢的力学性能的概率模型，我们得出在屈曲前和屈曲后的曲线的交点处定义的最大旋转的统计分布。接下来，我们估计所谓的超强度因素。

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  • 来源
    《Earthquake Engineering & Structural Dynamics》 |2013年第7期|953-972|共20页
  • 作者

    Srour Nofal; Hugues Somja; Mohammed Hjiaj; Quang Huy Nguyen;

  • 作者单位

    Universite Europeenne de Bretagne/INSA de Rennes, Structural Engineering Research Group/LGCGM, 20 avenue des Suites de Coesmes, CS 70839-35748, Rennes Cedex 7, France;

    Universite Europeenne de Bretagne/INSA de Rennes, Structural Engineering Research Group/LGCGM, 20 avenue des Suites de Coesmes, CS 70839-35748, Rennes Cedex 7, France;

    Universite Europeenne de Bretagne/INSA de Rennes, Structural Engineering Research Group/LGCGM, 20 avenue des Suites de Coesmes, CS 70839-35748, Rennes Cedex 7, France;

    Universite Europeenne de Bretagne/INSA de Rennes, Structural Engineering Research Group/LGCGM, 20 avenue des Suites de Coesmes, CS 70839-35748, Rennes Cedex 7, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    composite frame; rotation capacity; overstrength; material variability; local plastic buckling;

    机译：复合框架旋转能力过度的力量材料变异性;局部塑料屈曲;

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