高层建筑混合结构钢梁与混凝土墙节点低周反复加载试验研究

为研究高层建筑混合结构钢梁与混凝土墙连接节点的性能,本文进行了3个足尺钢梁-混凝土墙节点试件试验研究。通过对钢梁施加恒定剪力与反复轴力,模拟重力与地震作用的影响,研究了解高层建筑混合结构钢梁与混凝土墙节点在地震作用下的破坏机理、破坏形态和极限承载力等特性。试验表明,按现行规范规定的锚固长度,可使节点的锚筋强度充分发挥,但反复荷载作用会使锚筋强度降低,而节点的承载力可按强度理论同时考虑重力引起的剪力和弯矩及地震引起的轴力确定。

Cyclic loading tests of steel beam to concrete wall joints in steel-concrete mixed structures

In order to investigate the behavior of steel beam to concrete wall(SBCW) joints in steel concrete mixed structures under constant shear force and constant moment exerted by gravity, as well as cyclic axial force exerted by earthquakes, experiments on 3 full scale specimens of SBCW joints were conducted. The strain and slip distribution of anchor bar, load bearing capacity and destruction form of these specimens were analyzed and the effects of different cyclic axial force routine on behavior of SBCW joints were also assessed. Based on the experiments, the strength of the anchor bar, which may be reduced by cyclic loads, can be made full use of and the anchorage length requirement presented by the related national code of China for the design of concrete structures can be used for the seismic resistant design of the anchor bars in the SBCW joints. It is proposed that the moments, shear force and axial force should be considered simultaneously for the load bearing capacity of the SBCW joints.