多维地震激励下人字形桥梁地震模拟振动台试验研究

发布时间：2018-04-11 14:17

本文选题：人字形桥梁 + 多维激励　；参考：《振动与冲击》2016年07期

【摘要】：为研究人字形桥梁在地震作用下的动力响应,以某人字形桥梁为原型,制作了一座相似比为1∶20的模型桥梁,采用El-Centro波对其进行了不同地震烈度的多维激励地震模拟振动台试验和有限元分析。研究结果表明:随着地震烈度的增加,模型结构自振频率降低阻尼比增大;桥墩墩顶顺桥向加速度响应基本不受竖向地震分量影响;计算桥墩墩底应变响应时进行水平双向地震激励即可满足要求;梁体跨中竖向加速度响应,主梁和分支梁间的伸缩缝宽度取值,伸缩缝处的碰撞响应等均与地震波输入维度有关。因此,对于人字形桥梁在进行抗震设计时应针对不同的设计目的对其进行选择性的多维地震激励。
[Abstract]:In order to study the dynamic response of a herringbone bridge under earthquake action, a model bridge with a similar ratio of 1:20 was made using someone's zigzag bridge as the prototype.The shaking table test and finite element analysis of multi-dimensional excitation seismic simulation with different seismic intensity are carried out by using El-Centro wave.The results show that with the increase of seismic intensity, the natural frequency of the model structure decreases the damping ratio increases, and the acceleration response of the piers is not affected by the vertical seismic component.The horizontal and bidirectional seismic excitation can be used to calculate the strain response at the bottom of the pier, the vertical acceleration response of the beam span and the width of the expansion joint between the main beam and the branch beam can be obtained.The collision response at the expansion joint is related to the dimension of seismic wave input.Therefore, in seismic design of herringbone bridges, selective multi-dimensional seismic excitation should be carried out for different design purposes.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金(51078306);国家自然科学基金青年基金(51408453) 陕西省自然科学基础研究计划资助项目(2013JQ7007)
【分类号】：U442.55

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