砌体结构的地震动潜在破坏势研究

为了研究地震动参数和砌体结构在地震作用下反应的相关性,将15个地震动参数按特性(峰值、频率、持时和能量)分成四类,将地震记录按地震动三要素(峰值、频率、持时)分成三组,求出每组记录作用下砌体结构的延性系数,计算出各个参数值和延性系数的相关系数,比较分析这些相关系数可以发现:有效峰值加速度能够体现地震动对高层砌体结构的潜在破坏势;地震动峰值加速度能够非常好的表征对短周期脆性结构的破坏势;能量参数对低层砌体反应存在一定相关性;持时参数和砌体结构的反应没有关联.

Study on the damage potential to masonry structures of earthquake ground motions

In order to study the correlation between earthquake ground motion parameters and the response of masonry structures subjected to ground motions,fifteen ground motion parameters were divided into 4 kinds according to their property and the ground motion records were grouped into 3 teams based on the three factors,that is amplitude,spectra and duration,of ground motion.The correlation coefficient between the ductility of two masonry structures subjected to each group of ground motions and the corresponding ground motion parameters were calculated.Then the analysis and comparison of correlation coefficient was conducted and the result implies that the effective peak acceleration of ground motion can reflect the damage potential to high-rise masonry structure and PGA can reflect the damage potential to brittle structure with short period very well.Also,the energy parameters of ground motion have correlation with the low-rise masonry structure to some degree.While the duration parameter of ground motion almost has no correlation with the response of masonry structures subjected to earthquake ground motions.