独塔斜拉桥模型地震模拟振动台台阵试验

发布时间：2018-05-26 09:34

本文选题：独塔斜拉桥 + 振动台台阵试验　；参考：《东南大学学报(自然科学版)》2014年06期

【摘要】：为了研究独塔斜拉桥在强震作用下的地震响应特性,设计制作缩尺比例为1∶30的半漂浮体系独塔斜拉桥结构模型,进行不同地震动作用下多点激励的地震模拟振动台试验.研究结果表明:支座破坏是半漂浮体系独塔斜拉桥缩尺模型在强震作用下的一种主要破坏模式;与只考虑单向水平地震波的情况相比,考虑双向水平地震波同时作用对半漂浮体系独塔斜拉桥的加速度响应影响显著,而对动位移响应的影响较小;在双向水平地震波作用下,主梁跨中会发生不可忽略的竖向加速度响应,卓越周期较长的地震波对半漂浮体系独塔结合梁斜拉桥缩尺模型更具破坏性,强震下斜拉索要承受远大于初始索力的瞬时索力.
[Abstract]:In order to study the seismic response characteristics of single tower cable-stayed bridge under strong earthquake, the structural model of semi-floating cable-stayed bridge with a scale of 1:30 was designed, and the shaking table test of multi-point excitation under different ground motion was carried out. The results show that the support failure is one of the main failure modes of the scale model of semi-floating single-tower cable-stayed bridge under strong earthquake, and compared with considering only unidirectional horizontal seismic waves, Considering the simultaneous action of bi-directional horizontal seismic waves, the acceleration response of semi-floating single-tower cable-stayed bridge is significantly affected, but the dynamic displacement response is less affected. The vertical acceleration response can not be ignored in the middle of the main beam span, and the seismic wave with long outstanding period is more destructive to the scale model of semi-floating system single tower combined with beam cable-stayed bridge, and the instantaneous cable force which is far larger than the initial cable force is demanded by the cable-stayed bridge under strong earthquake.
【作者单位】：福州大学土木工程学院;东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178101,51378112) 招商局重庆交科院桥梁工程结构动力学国家重点实验室开放基金资助项目(201401)
【分类号】：U448.27

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