确定大跨连续刚构桥地震动输入时程方法比较
发布时间：2018-10-18 09:26
【摘要】：以上海某大跨度连续钢构桥梁的场地为例,讨论动水压力对河谷场地土层地震响应的影响,通过对建筑结构抗震规范反应谱生成时程,采用一维、二维模型分别计算得到场地地震动输入时程。对比可以看出,考虑动水压力将会大大减小场地的竖向地震动反应,而动水压力对水平向的地震响应影响不大;反应谱生成时程的方法与一维模型计算得到的时程均与采用考虑场地地形变化的二维模型的计算结果有较大的区别;二维模型计算得到的时程反应谱的卓越周期超出规范反应谱的平台段。最后,讨论了河谷场地对周围场地的影响范围,结果表明河水及河谷对周围场地水平方向的影响范围是沿河谷外侧5倍土层深度或140倍河谷深度,在该范围内的建筑物均应考虑河谷的影响。
[Abstract]:Taking the site of a large span continuous steel bridge in Shanghai as an example, this paper discusses the influence of dynamic pressure on seismic response of soil layer in valley site. By generating time history of seismic response spectrum of building structure, one dimension is adopted. The input time history of ground motion is calculated by two-dimensional model. It can be seen from the comparison that considering the dynamic water pressure will greatly reduce the vertical seismic response of the site, but the dynamic water pressure has little effect on the horizontal seismic response. The time history generated by the response spectrum method is different from that obtained by the one-dimensional model and the two-dimensional model which takes into account the site topography change. The outstanding period of the time-history response spectrum calculated by the two-dimensional model exceeds the plateau section of the gauge response spectrum. Finally, the influence range of river valley site on surrounding site is discussed. The results show that the influence range of river water and river valley on the horizontal direction of surrounding site is 5 times depth of soil layer outside the river valley or 140 times depth of river valley. The effect of the valley should be taken into account in all buildings within this area.
【作者单位】： 同济大学土木工程防灾国家重点实验室;井冈山大学建筑工程学院;
【基金】：国家自然科学基金资助(No.90915011)
【分类号】：U442.55
本文编号：2278702
[Abstract]:Taking the site of a large span continuous steel bridge in Shanghai as an example, this paper discusses the influence of dynamic pressure on seismic response of soil layer in valley site. By generating time history of seismic response spectrum of building structure, one dimension is adopted. The input time history of ground motion is calculated by two-dimensional model. It can be seen from the comparison that considering the dynamic water pressure will greatly reduce the vertical seismic response of the site, but the dynamic water pressure has little effect on the horizontal seismic response. The time history generated by the response spectrum method is different from that obtained by the one-dimensional model and the two-dimensional model which takes into account the site topography change. The outstanding period of the time-history response spectrum calculated by the two-dimensional model exceeds the plateau section of the gauge response spectrum. Finally, the influence range of river valley site on surrounding site is discussed. The results show that the influence range of river water and river valley on the horizontal direction of surrounding site is 5 times depth of soil layer outside the river valley or 140 times depth of river valley. The effect of the valley should be taken into account in all buildings within this area.
【作者单位】： 同济大学土木工程防灾国家重点实验室;井冈山大学建筑工程学院;
【基金】：国家自然科学基金资助(No.90915011)
【分类号】：U442.55
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