钢筋混凝土空心矩形桥墩振动台试验

Shake Table Test for Reinforced Concrete Hollow Rectangular Pier

通过地震模拟振动台试验研究了钢筋混凝土空心矩形桥墩的抗震性能,以某空心矩形桥墩为原型设计了2个具有不同配箍率的空心矩形桥墩模型试件,并对其进行地震模拟振动台试验,选取El Centro波、Taft波和人工兰州波作为地震动激励,分析了各工况荷载下桥墩顶部的加速度响应、动力放大系数和墩顶位移响应等参数;利用大型通用有限元软件ABAQUS建立了桥墩有限元模型,将试验采集的加速度和位移响应同有限元计算结果进行对比分析。结果表明:2个模型试件均具有良好的抗震性能;不同地震波激励作用下,桥墩顶部加速度和位移响应不同;配箍率越高,墩身裂缝分布越密集,裂缝宽度越小;配箍率对加速度和速度响应无显著影响;验证了利用ABAQUS软件建立的有限元模型的可行性。

The seismic performance of reinforced concrete hollow rectangular bridge piers was studied by seismic simulation shaking table test.Two hollow rectangular bridge piers with different stirrup rates were designed with a hollow rectangular bridge pier as the prototype.The seismic simulation shaking table test was carried out about the piers,and El Centro wave,Taft wave and Lanzhou wave were selected as the dynamic excitation.The acceleration response of the pier top,the dynamic magnification coefficient and the displacement response at the pier top were analyzed.The finite element model of the pier was established by using the large general finite element software ABAQUS,and the acceleration and displacement vibration responses of the test were compared with the finite element calculation results.The results show that the two model specimens have good seismic performance.Under the action of different seismic waves,the acceleration and the displacement vibration response of the pier are different.The higher the ratio of the stirrup,the more dense the crack distribution is,the smaller the width of the crack is.The stirrup rate has no significant influence on the acceleration and the velocity response,and the finite element model established by using the ABAQUS is feasible.