矩形空心桥墩抗震性能研究

Research on the Seismic Performance of Rectangular Hollow Bridge Pier

为研究水平地震作用下矩形空心桥墩的抗震性能,对2个不同轴压比的桥墩进行了恒定竖向荷载下拟静力试验,同时还研究了试件刚度退化、承载能力、耗能能力和延性系数等抗震性能指标,并基于ABAQUS有限元软件对试验得出的抗震性能规律进行了验证。研究结果表明:该试验破坏模式为底部塑性铰区域的弯曲破坏;ABAQUS模拟结果与试验值有良好的吻合程度,对试验值有较好的验证与补充效果;较大的轴压比形成了更强的约束,限制了桥墩混凝土裂缝的开展,提高了桥墩的承载力和刚度;轴压比大的试件耗能能力和延性系数低。

In order to study the seismic behavior of rectangular hollow bridge piers under horizontal earthquake,pseudo-static tests of two bridge piers with different axial compression ratios under constant vertical loads were carried out.The seismic performance indexes such as stiffness degradation,bearing capacity,energy dissipation capacity and ductility coefficient were also studied.The seismic performance law was verified by ABAQUS finite element software.The results show that the failure mode is bending failure at the bottom of plastic hinge area;ABAQUS simulation results are in good agreement with experimental values,and good verify and supplement the experimental values;The larger axial compression ratio forms stronger constraints,limits the development of concrete cracks of bridge piers,and improves the bearing capacity and stiffness of bridge piers;The energy dissipation capacity and ductility coefficient of specimens with large axial compression ratio are low.