钢筋混凝土Z形截面双向压弯柱抗震性能试验研究

为了研究Z形截面钢筋混凝土柱的抗震性能，对缩尺比为1∶2的9根试件进行了拟静力试验，2根试件进行了单调荷载试验。分析了轴压比（n取0.30、0.45）、加载方向（加载角α为0°、45°、90°、135°）、肢高肢厚比（3∶1、4∶1）、纵筋强度等级（HRB400、HRB500）等参数对其抗震性能的影响。研究了Z形截面柱的破坏特征，得到了试件的荷载-位移滞回曲线及骨架曲线、承载力、位移延性系数等力学性能指标。研究结果表明：试件在横向反复荷载作用下的主要破坏形态为弯曲型破坏，破坏主要发生在与加载方向平行的跨中截面，滞回曲线对称、饱满，试件延性好，具有良好的抗震能力。采用数值分析方法编制了Z形截面柱承载力电算程序进行计算，计算结果与试验结果吻合较好。

Experimenta1 study on seismic behavior of Z-shaped reinforced concrete columns subjected to biaxial bending and axial compression

In order to study the seismic performance of Z-shaped reinforced concrete columns,cyclic loading tests were carried out on nine 1/2 reduced-scale specimens and monolithic loading tests on two specimens.The effect of axial compression ratio(n=0.30,0.45),lateral loading direction(α=0°,45°,90°,135°),web depth-thickness ratio(3∶ 1,4∶ 1) and strength of the longitudinal bars(HRB400,HRB500) were studied.And the failure characteristics,mechanical behaviors of Z-shaped section columns such as the loading-displacement hysteretic loops and skeleton curves,load bearing capacity and displacement ductility were analyzed.The experimental results indicate that the major failure made of the tested column is flexural failure,and the destruction mainly occurs at the mid-span cross-section which parallels the force direction.The hysteretic loops of Z-shaped section columns are symmetric and plump.The specimens have good ductility,indicating excellent seismic behavior.A computer program aiming at obtaining the bearing capacity of Z-shaped columns under axial compression and biaxial bending was compiled.The analytical results are in good agreement with the test results.