近断层地震动作用下大跨度曲线刚构桥台阵试验研究

发布时间：2018-07-11 10:24

本文选题：近断层地震动 + 曲线刚构桥　；参考：《振动与冲击》2017年05期

【摘要】：为了研究近断层地震动对大跨度曲线刚构桥抗震性能的影响,以某一大跨度曲线刚构桥为原型,设计制作1/40缩尺比例模型,选取同一地震中的近断层地震动记录和远场地震动记录,利用多子台积木式模拟振动台台阵系统,完成了横向、纵向、横向+纵向一致输入及行波输入的对比试验。研究结果表明:近断层地震动中所含的速度脉冲会对曲线刚构桥的动力响应产生显著影响,并且行波效应会进一步提升其对结构响应的放大作用;近断层效应的放大作用对刚度较大的结构或者结构某一个方向更为明显,而行波效应对结构的影响主要取决于由多点激励所激发的高阶反对称模态;与直线桥相比较,曲率半径会增大曲线梁桥的水平刚度,从而使近断层效应和行波效应对曲线桥的动力响应产生更不利的影响。因此,在靠近断层的区域遭受同样的地震作用,曲线梁桥将产生更为严重的破坏,建议在抗震设计中应特别注意处于断层附近的曲线桥结构。
[Abstract]:In order to study the effect of near-fault ground earthquake on the seismic behavior of a long-span curved rigid frame bridge, a 1 / 40 scale model was designed and made with a large span curved rigid frame bridge as a prototype. Based on the near fault ground motion records and far field ground motion records of the same earthquake, the horizontal, longitudinal, horizontal and vertical consistent input and traveling wave input are completed by using the multi-substation building block simulation platform array system. The results show that the velocity pulse contained in the near-fault earthquake will have a significant effect on the dynamic response of curved rigid frame bridge, and the traveling wave effect will further enhance the amplification of the structural response. The amplification effect of near-fault effect is more obvious to the structure with larger stiffness or in a certain direction, while the effect of traveling wave effect on the structure depends mainly on the high-order antisymmetric mode excited by the multi-point excitation, which is compared with the linear bridge. The curvature radius will increase the horizontal stiffness of the curved girder bridge, which makes the near-fault effect and traveling wave effect more unfavorable to the dynamic response of the curved bridge. Therefore, the curved girder bridge will suffer more serious damage due to the same earthquake action in the area near the fault. It is suggested that special attention should be paid to the curved bridge structure near the fault in seismic design.
【作者单位】：西南交通大学土木工程学院;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：国家自然基金项目(51508473) 中央高校基本科研业务费专项资金科技创新项目(10101B10096037)
【分类号】：U442.55;U448.23

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