圆钢管柱-H形梁外环板式节点抗连续性倒塌性能试验研究

发布时间：2018-02-05 02:35

本文关键词： 钢框架梁柱节点钢管柱连续性倒塌静力试验鲁棒性传力机制　出处：《建筑结构学报》2014年07期 　论文类型：期刊论文

【摘要】：以2个圆钢管柱-H形梁外环板式节点为研究对象,采用双半跨单柱型梁柱子结构,通过对中柱施加静力荷载的大挠度试验及有限元分析考察梁柱节点在中柱失效的连续性倒塌条件下的力学性能。结果显示,试件的破坏均位于环板外伸段与梁的连接截面,发生在梁弦转角大于0.08 rad之后。全焊连接试件截面呈现自下翼缘至上翼缘的连续性断裂现象,而栓焊连接试件截面断裂可限制在下翼缘并依靠腹板螺栓传力。梁柱子结构在加载前期主要通过抗弯机制提供竖向抗力,在加载后期逐渐转变为依靠悬索机制抵抗上部荷载。栓焊混合连接试件在截面断裂后可充分发展截面轴力,因此在加载后期可通过悬索机制提供更高的承载力,表现出较全焊连接试件更为富余的后期强度储备。
[Abstract]:In the 2 round steel tube column -H beam outer ring plate node as the research object, using the double half span single column beam column structure, the large deflection test applied static load on column and finite element analysis of beam column joints in column failure of continuous collapse under the condition of mechanical properties. The results showed that: the connection section of the failure of the specimens were located in the extended section of ring plate and beam, occurred after the beam string angle is greater than 0.08 rad. The cross section of the specimen showed a continuous flange fracture phenomenon since the first flange welded connection and bolt welded joint specimen fracture section can be limited to the lower flange and rely on force transmission bolt beam column structure in the web. Loading mainly through the bending mechanism of vertical force, in the loading stage and gradually transformed into the upper load resistance mechanism. The specimens in suspension on the section after the full development of fracture section of axial force of welded bolted connection, so in loading Later, a higher bearing capacity can be provided by the suspension mechanism, showing a more residual strength reserve than the full welded joint.

【作者单位】：同济大学土木工程防灾国家重点实验室;同济大学建筑工程系;
【基金】：国家自然科学基金项目(51008220) 中央高校科研基本业务费专项资金项目(TJ2014)
【分类号】：TU391;TU317.1
【正文快照】： 0引言建筑结构因突发事件作用造成初始局部破坏可能导致相邻构件或部分结构的渐进失效,在该过程中结构鲁棒性对防止结构发生连续性倒塌至关重要。当高层建筑结构的局部竖向承重构件失效后,剩余结构各部分的有效拉结可促成传力路径的转变,被认为是阻止结构连续性倒塌的最有效方

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