为研究Q460高强钢管柱-H形梁焊接节点在地震作用下的力学行为，对11个梁翼缘板与柱段焊接组成的节点进行了低周循环拉伸性能试验，研究了梁翼缘板与钢管宽度比 α、厚度比 β 以及钢管宽厚比 λ 等参数对节点破坏模式、承载力、延性和耗能能力的影响规律。结果表明：在循环拉伸荷载作用下，Q460高强钢管柱-H形梁焊接节点的失效模式主要分为连接处焊缝断裂、连接处钢管面板断裂或梁翼缘板被拉断三种；高强钢梁翼缘板与钢管宽度比、钢管柱宽厚比对焊接节点的受力行为影响较大，当宽厚比 α 由25.0减小到18.75时，节点的应变能减小了134%；当节点破坏时，具有新型焊接通过孔构造的焊接节点极限位移超过传统构造节点近2倍，前者延性性能较好。研究成果可为高强钢管柱与梁焊接节点的抗震设计以及进一步的理论研究提供依据。
Abstract
To study the mechanical behavior of tube column and H beam welded joint with Q460 high strength steel (HSS) under earthquake, 11 specimens consisting of flange plate of H-shaped beams that were welded to rectangular columns at flange plates were tested under a cyclic tensile condition. The effects of the width ratio of the beam flange plate to the tube column, thickness ratio of the tube column on the failure mode, bearing capacity, ductility and energy dissipation capacity of the joint are studied. The results show that the failure modes of the tube column and H beam welded joint using Q460 HSS are mainly divided into three types after the cyclic tensile test: weld fracture at the connection, fracture failure of the tube column panel at the connection or tensile fracture of the beam flange; The width ratio α and the width thickness ratio λ have a greater impact on the mechanical behavior of welded joints with HSS, when α decreases from 25.0 to 18.75, the strain energy of the joint decreases by 134%; In addition, when a joint was damaged, the ultimate displacement of a welded joint with a new type of welded access hole construction is nearly two times greater than that of a traditional construction joint, and the former has better ductility. The research results can provide a basis for seismic design and further theoretical research of tube column and H beam welded joint with HSS.
关键词
高强钢 /
焊接节点 /
循环拉伸试验 /
破坏模式 /
耗能能力
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Key words
high strength steel /
welded joint /
cyclic tensile test /
failure mode /
energy-dissipating capacity
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