左右梁高不同的箱型截面柱-H型钢梁外加强环式异型节点抗震性能试验研究

Experimental study on seismic behavior of irregular panel zone with different beam depths of steel frame connected with a strengthened external diaphragm

随着建筑造型、结构形式和空间使用功能的变化,出现了一些新型的钢结构节点,例如柱两侧梁高不同的异型节点。本研究开展了3个左右两侧梁高不同的外加强环式箱型截面柱-H型钢梁异型节点的抗震性能试验研究,试验参数为左右梁的梁高比α。试验成果表明:(1)从应变片的测量结果可知所有试件均以节点域的剪切变形为主要的破坏模式。(2)异形节点的剪力-剪切角关系曲线形状饱满,具备较好的耗能能力。(3)相同条件下,异形节点域比标准形节点域的剪切变形角小,结构更安全。

With the changes in the architectural modeling,structure form and spacial function,there are some new steel joints,such as irregular joints,appear beams on both sides of the column of different elevation. Experimental methods are used with 3 specimens to investigate the seismic performance of panel zone at the connection of box section steel column and two H-shaped beams with different heigth levels. Parameter α is considered in this paper and α is the ratio of small beam depth to big beam depth. The test result reviewed that:( 1) As the results of strainmeasurement are shown,the failure modes of the panel zone are shear deformation of panel zone.( 2) The hysteretic curves of the irregular panel zone have full hysteretic loops and better energy dissipation capacity.( 3) when the story drift angle remains constant,Angles of shear deformation in irregular panel zone specimens are smaller than it in the standard specimen and the structure is more safe.