考虑场地类别和断层距的地震动及结构响应参数相关性分析

Correlation analysis of ground motion parameters and structural response parameters considering the site condition and fault distance

为了研究场地条件和断层距对地震动参数及其与结构响应参数相关性的影响,本文基于NGA数据库中5 266条水平分量地震动记录,采用皮尔森相关系数,分析了不同场地条件和断层距下地震动参数之间的相关性及其与结构响应参数的关系。结果表明,场地条件和断层距对绝大部分地震动参数相关性会产生明显影响,但存在一些参数的相关性几乎不受场地条件和断层距的影响;以四层钢筋混凝土框架结构为例,发现在不同场地条件和断层距下,结构响应参数与地震动参数的相关性变化明显,这表明在研究结构响应与地震动参数相关性时需要考虑场地条件与断层距的影响。

In order to study the influence of site conditions and fault distances on the correlation of the ground motion parameters and structural response parameters, based on the 5 266 horizontal-component ground motion records chosen from the Next Generation Attenuation(NGA) Strong Motion Database, the correlation of the ground motion parameters and the structural response parameters is discussed by the Pearson coefficient under the different site conditions and Jonner-Boore fault distances. It has been found that the classification of site and the fault distance has a significant effect on the correlation of most ground motion parameters and the structural response parameters, and there are still some parameters be almost independent on the site condition and fault distance. Exampled by a four-story reinforced concrete framework building, it has been found that the correlation between structural response parameters and ground motion parameters varies significantly in different site conditions and fault distances, which indicates that the influence of site conditions and fault distances should be considered when studying the correlation between structural response parameters and ground motion parameters.