Experimental Validation of Finite Element Models for Open-to-CHS Column Connections

Rajarshi Das, Alper Kanyilmaz, Herve Degee
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Abstract

The conventional ways to construct an open-to-circular hollow section (CHS) connection are either to directly weld the open section to the CHS column wall or to use local stiffeners (e.g., diaphragms) and gusset plates to connect the two structural components. These construction methods often subject the CHS to severe local distortions and/or require high welding quantities, hindering the real-life application of hollow sections. To overcome such difficulties, this study proposes two types of moment-resisting “passing-through” connection configurations, developed within the European research project “LASTEICON”. These configurations consist of main beams connected to the CHS column via either an I-section or individual steel plates passing through the CHS column. The passing-through system is implemented using laser cut and weld technology and efficiently avoids excessive use of stiffening plates, local damages on the CHS wall and premature flange failures. The proposed configurations are investigated experimentally and numerically under two different load cases in order to characterize their structural behaviour. Finite element models have been developed and calibrated with respect to the experimental force–displacement behaviour of the connections as well as their observed failure modes. The efficiency, benefits, and limitations of the modelling approach were discussed through a detailed comparison study between the experimental and numerical results.
开放- chs柱连接有限元模型的试验验证
传统的构造开口到圆形空心截面(CHS)连接的方法是要么直接将开口截面焊接到CHS柱壁上,要么使用局部加强筋(例如,隔板)和折板来连接两个结构部件。这些施工方法通常会使CHS遭受严重的局部变形和/或需要高焊接量,从而阻碍了空心截面的实际应用。为了克服这些困难,本研究提出了两种类型的抗力矩“穿过”连接配置,这是在欧洲研究项目“lasticon”中开发的。这些结构由主梁组成,主梁通过工字截面或穿过CHS柱的单个钢板连接到CHS柱。该直通系统采用激光切割和焊接技术,有效避免了加强板的过度使用、CHS壁的局部损坏和法兰过早失效。在两种不同的荷载情况下,对所提出的结构进行了实验和数值研究,以表征其结构性能。根据连接的试验力-位移行为及其观察到的破坏模式,已经开发和校准了有限元模型。通过对实验结果和数值结果的详细对比研究,讨论了建模方法的效率、优点和局限性。
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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