斜拉桥地震响应与地震动参数相关性分析

发布时间：2018-05-04 00:01

本文选题：斜拉桥 + 地震响应　；参考：《结构工程师》2017年01期

【摘要】：对于斜拉桥结构而言,目前的研究很少能够给出与地震响应相关性较好的地震动参数,从而使得计算的结构风险并不合理。因而,对地震动参数与斜拉桥地震响应之间的相关性进行了研究。以一座主跨400 m的双塔斜拉桥为例,采用OpenSees建立了非线性的有限元模型,选取195条实测地震记录进行计算,提取了桥塔的剪力、弯矩、曲率、塔顶位移等响应,并对这些响应与地震动参数的相关性进行了分析。结果表明:目前常用的PGA、PGV、反应谱加速度峰值、反应谱速度峰值等参数与斜拉桥地震响应的相关性总体较好,但是仍存在一定的局限性;Housner强度、持续最大速度、Arias强度等参数与斜拉桥地震响应也有较好的相关性,可选为反映斜拉桥响应的地震动强度指标;而PGV/PGA、PGD和位移均方根值等参数与斜拉桥地震响应相关性很差,不宜选为地震动强度指标。
[Abstract]:For cable-stayed bridge structures, the seismic parameters with good correlation with seismic response are rarely given in the present research, which makes the calculated structural risk unreasonable. Therefore, the correlation between seismic parameters and seismic response of cable-stayed bridges is studied. Taking a two-tower cable-stayed bridge with a main span of 400m as an example, a nonlinear finite element model is established by using OpenSees, and 195 seismic records are selected to calculate the responses of the tower, such as shear force, bending moment, curvature, tower top displacement, etc. The correlation between these responses and seismic parameters is analyzed. The results show that the commonly used parameters such as the peak of response spectrum acceleration and the peak of response spectrum velocity have a good correlation with the seismic response of cable-stayed bridges, but there are still some limitations in the strength of Housner. The parameters such as Arias intensity and the seismic response of cable-stayed bridge have good correlation, and can be selected as the index of seismic intensity to reflect the response of cable-stayed bridge, while the parameters such as PGV / PGA _ (PGD) and displacement root mean square value (RMS) have poor correlation with the seismic response of cable-stayed bridge. It is not suitable to select the index of ground motion intensity.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：土木工程防灾国家重点实验室基金资助项目(SLDRCE14-B-14) 国家自然科学基金资助项目(51478339,51278376,91315301) 国家科技支撑计划课题(20151BAK17B04)
【分类号】：U448.27;U442.55

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