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Experimental tests of different types of bolted steel beam-column joints under a central-column-removal scenario

机译：中心柱拆除方案下不同类型螺栓连接的钢梁柱节点的试验测试

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摘要

Several structural collapse incidents indicate that failure usually started from beam-column joints when exposed to abnormal loads. If the connections are sufficiently robust and there is adequate axial restraint from adjoining structures, catenary action usually forms and gives rise to alternate load paths when affected columns are severely damaged, resulting in large deformations in adjoining beams and slabs. This paper presents seven experimental tests of the performance of common types of bolted steel beam-column joints under a central-column-removal scenario. The joint types including web cleat, top and seat angle, top and seat with web angle (TSWA) (8 mm angle), fin plate, flush end plate, extended end plate and TSWA(12 mm angle) are studied under the central-column-removal scenario. This study provides the behaviour and failure modes of different connections, including their abilities to deform in catenary mode. The test results indicate that the web cleat connection has the best performance in the development of catenary action, and the flush end plate, fin plate and TSWA connections could also deform in a ductile manner and develop catenary action prior to failure. It is worthy to note that tensile capacities of beam-column joints after undergoing large rotations usually control the failure mode and the formation of catenary action. A new tying resistance expression is proposed to consider the effect of large rotation. If large rotation is not considered in the design stage, the joints with poor rotation capacities would fail to achieve the design tying resistances. The test results also demonstrate that the rotation capacities of beam-column joints based on the experimental results in this study were much higher than the recommended values.
机译：几次结构倒塌事故表明，当暴露于异常载荷时，破坏通常是从梁柱节点开始的。如果连接足够牢固，并且相邻结构有足够的轴向约束，则通常会形成悬链线作用，并在受影响的立柱受到严重破坏时产生交替的荷载路径，从而导致相邻梁和楼板大变形。本文介绍了在中心柱拆除情况下常见类型的螺栓连接钢梁-柱节点的性能的七个实验测试。接头类型包括腹板夹板，顶板和阀座角度，顶板和腹板角度（TSWA）（8毫米角），散热片，齐平端板，延伸端板和TSWA（12毫米角）。列删除方案。这项研究提供了不同连接的行为和失效模式，包括它们在悬链线模式下变形的能力。测试结果表明，腹板防滑钉连接在悬链作用的发展方面具有最佳性能，齐平端板，翅片板和TSWA连接也可能会延展变形，并在破坏前产生悬链作用。值得一提的是，经过大的旋转后，梁柱节点的抗拉能力通常控制破坏模式和悬链线作用的形成。考虑到大旋转的影响，提出了一种新的绑扎阻力表达式。如果在设计阶段不考虑大旋转，则旋转能力较弱的接头将无法实现设计约束力。测试结果还表明，基于这项研究中的实验结果，梁柱节点的旋转能力远远高于推荐值。

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  • 来源
    《Engineering Structures》 |2013年第9期|112-130|共19页
  • 作者

    Bo Yang; KangHaiTan;

  • 作者单位

    College of Civil Engineering, Chongqing University. Chongqing 400044. China,School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;

    School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Progressive collapse; Connection; Beam-column joints; Catenary action; Large deformation; Experimental tests; Steel;

    机译：逐渐崩溃;连接;梁柱节点;悬链动作;大变形;实验测试;钢;

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