摘要
利用《中国地震动参数区划图》采用的地震动参数衰减关系,以及《中国地震动参数区划图》中地震动峰值加速度和地震动加速度反应谱特征周期反推不同设防烈度和设计地震分组对应的震级和震中距,再根据《建筑抗震设计规范》中各设防水准的峰值加速度确定对应的震级和震中距,进而根据地震动强度包线参数与震级和震中距关系计算地震动强度包线参数的取值,为基于强度包线函数生成人工地震动提供参考,并讨论强度包线参数的取值规律:(1)随着设防烈度的提高,加速度时程曲线上升段持续时间t_(1)和平稳段持续时间t_(s)减小,下降段衰减指数c增大;(2)随着地震水准和设计地震分组的提高,加速度时程曲线上升段持续时间t_(1)和平稳段持续时间t_(s)增加,下降段衰减指数c减小;(3)在生成人工地震动时,除考虑峰值加速度和设计地震分组影响外,还需要考虑设防烈度影响。
On the basis of the attenuation relation of ground motion parameters,the peak ground acceleration,and the characteristic period of seismic acceleration response spectrum adopted in the Seismic Ground Motion Parameters Zonation Map of China,the magnitude and epicentral distance corresponding to different fortification intensity and design earthquake classification were deduced in this paper.Then,the corresponding magnitude and epicentral distance were determined according to the peak acceleration of each fortification level given by the Code for Seismic Design of Buildings.Finally,the value of the intensity envelope function was calculated according to its relation with the magnitude and epicentral distance,thus providing a reference for generating artificial ground motions based on the intensity envelope function.The parameter determination rule of intensity envelope function was also discussed:(1)With the increase in the fortification intensity,the rising duration t_(1) and the stable duration t_(s) of the acceleration time-history curve decrease,and the attenuation index c increases;(2)With the increase in the ground motion intensity and design earthquake classification,t_(1) and t_(s) increase,and c decrease;(3)When generating artificial ground motion,the influence of fortification intensity should also be considered aside from the influence of peak acceleration and design earthquake classification.
作者
余文正
吴宗谦
杨瑞欣
兰香
YU Wenzheng;WU Zongqian;YANG Ruixin;LAN Xiang(School of Construction Engineering,Kunming University,Kunming 650214,Yunnan,China;Yunnan Land and Resources Vocational College,Kunming 652501,Yunnan,China)
出处
《地震工程学报》
CSCD
北大核心
2022年第5期1151-1159,共9页
China Earthquake Engineering Journal
基金
云南省教育厅科学研究基金项目(2020J0512)
昆明学院引进人才科研项目(YJL2106)
云南省教育厅科学研究基金项目(2020J0511)
云南省大学生创新创业训练计划项目(202111393006)。
关键词
人工地震动
强度包线函数
震级
震中距
地震动持时
artificial ground motion
intensity envelope function
magnitude
epicentral distance
ground motion duration
