Ultimate strength of box section steel bridge compression members in comparison with specifications

Case Studies in Structural Engineering Pub Date : 2014-12-01 DOI:10.1016/j.csse.2014.07.001

Lilya Susanti, Akira Kasai, Yuki Miyamoto

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引用次数: 6

Abstract

Initial distortion and residual stress are well known as the most important initial imperfection factors and have a significant effect in decreasing the ultimate strength of compression members. The present work focuses on predicting the ultimate strength of welded box section steel compression members regarding initial imperfection factors. Beam compared with shell type of Finite Element (FE) models varied in slenderness ratio and initial distortion are used to assess the accuracy of present numerical results. The comparison of result between FE models and design strength formulations in some specifications are used to assess the ultimate strength formulations of bridge specifications according to the behavior of current steel compression members. It can be observed from numerical results that FE models and design strength by JSHB 2012 and AISC 2005/AASHTO 2010 have good agreement each other which means that the specifications have good capability in assessing the ultimate strength of steel compression members. Parametric study of the ultimate strain varied in slenderness ratio and load versus displacement curves of compression members are also introduced in order to perform more detail steel columns displacement behaviour. Finally, present work proposed a flowchart in designing steel compression members with the expectation that it will be helpful as reference for researchers and engineers in practical fields.

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箱式型钢桥梁抗压构件极限强度与规范的比较

初始变形和残余应力是最重要的初始缺陷因素，对压缩构件的极限强度有显著影响。本文主要研究了考虑初始缺陷因素的焊接箱式型钢受压构件的极限强度预测。采用不同长细比和初始变形的梁壳型有限元模型对数值结果的准确性进行了评价。根据现有钢受压构件的受力情况，将有限元模型的计算结果与部分规范的设计强度公式进行比较，对桥梁规范的极限强度公式进行评定。数值结果表明，JSHB 2012和AISC 2005/AASHTO 2010的有限元模型和设计强度具有较好的一致性，说明JSHB 2012和AISC 2005/AASHTO 2010对钢受压构件的极限强度评定具有较好的能力。为了更详细地研究钢柱的位移行为，还引入了极限应变随长细比变化和受压构件荷载-位移曲线的参数化研究。最后，本文提出了钢结构压缩构件的设计流程图，希望能对实际领域的研究人员和工程师有所帮助。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case Studies in Structural Engineering

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