超大承载力端板连接节点试验研究

发布时间：2018-01-18 12:33

本文关键词：超大承载力端板连接节点试验研究　出处：《土木工程学报》2017年02期 　论文类型：期刊论文

【摘要】：在大跨或重载钢结构中,当梁柱之间需要采用螺栓连接时,如果普通构造的端板连接节点和大承载力端板连接节点不能满足承载力要求,则需要采用受拉区布置12颗或16颗螺栓的超大承载力端板连接节点。为研究该类型节点受力性能,进行4个超大承载力端板连接节点足尺试件的单调加载试验,得到各节点试件的弯矩-转角曲线,分析不同螺栓直径、端板厚度和螺栓布置形式下各节点的抗弯承载力、转动刚度和受拉区螺栓拉应变增量分布的特点。结果表明,在试验试件构造条件下超大承载力端板连接节点的弯曲失效模式为端板屈服后螺栓失效,端板厚度对节点承载力影响明显;各螺栓的拉应变增量分布不均匀,角部螺栓对节点抗弯承载力影响较小,建议在设计中移除或仅按抗剪螺栓考虑;建议节点域屈服承载力仍按照现行规范计算,该类节点的等效受拉螺栓数量取为7。
[Abstract]:In large-span or heavy-load steel structures, when bolt connection is needed between Liang Zhu, if the common end-plate connection joint and large bearing capacity end-plate connection joint can not meet the bearing capacity requirements. It is necessary to use 12 or 16 bolts in tensile zone to connect the joints with super-large bearing capacity end plate. In order to study the mechanical performance of this type of joints. Through the monotonic loading test of four full-scale specimens with super-large bearing capacity end-plate connection joint, the bending moment-angle curve of each joint specimen was obtained, and the different bolt diameters were analyzed. The characteristics of the bending bearing capacity, rotational stiffness and tensile strain increment distribution of the joints in the form of end-plate thickness and bolt arrangement are discussed. The bending failure mode of end-plate connection joints with super-large bearing capacity is bolt failure after end-plate yield under the structural condition of test specimens, and the thickness of end-plate has a significant effect on the bearing capacity of joints. The tensile strain increment distribution of each bolt is uneven and the angle bolt has little effect on the bending bearing capacity of the joint. It is suggested that the bolt should be removed or only considered as shearing bolt in the design. It is suggested that the yield bearing capacity in the joint domain should still be calculated according to the current code, and the equivalent number of tensile bolts for this type of joint should be taken as 7. 5%.
【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;上海中远川崎重工钢结构有限公司;
【基金】：国家自然科学基金(51478244);国家自然科学基金优秀青年基金(51522806)
【分类号】：TU391
【正文快照】： 引言外伸式螺栓端板连接是钢结构中常用的螺栓连接形式,该节点形式具有不需要现场焊接,便于快速施工的优点,并且通过合理设计,节点可以获得较大的转动刚度和较好的延性[1-4]。传统构造的端板连接形式见图1,端板焊接于梁端,通过8颗螺栓与柱翼缘连接,在我国实际工程应用中经常采

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