基于地震动加速度反应谱的三维隔震结构摇摆性能研究  

Rocking performance of three-dimensional base isolated structures based on acceleration response spectra

作　　者：石运东 王宇辰[1] 王旋 丁阳 李忠献[1,2] SHI Yun-dong;WANG Yu-chen;WANG Xuan;DING Yang;LI Zhong-xian(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300350

出　　处：《振动工程学报》2023年第2期400-409,共10页Journal of Vibration Engineering

基　　金：土木工程防灾国家重点实验室开放课题基金资助项目(SLDRCE18-03);中国地震局工程力学研究所基本科研业务费专项资助项目(2019EEEVL0302);国家自然科学基金资助项目(51978463)。

摘　　要：三维隔震结构在地震作用下存在显著的摇摆现象,影响三维隔震技术的隔震效果。而不同类型的地震动作用对三维隔震结构的摇摆特性影响不同。由此提出一种基于地震动竖向与水平向加速度反应谱谱值之比对三维隔震结构摇摆性能进行评估的方法,并利用有限元模拟进行验证。基于1567条不同类型的地震动记录,分析不同震源机制、震中距、场地类型对三维隔震结构摇摆特性的影响规律。结果表明,震源机制、震中距、场地条件对三维隔震结构摇摆的影响显著。当不同地震动作用调幅后结构竖向加速度响应相同时,在典型三维隔震结构隔震周期范围内(水平向2.0~5.0 s,竖向0.3~1.0 s),逆断层和走滑断层地震动相比正断层地震动所造成的三维隔震结构摇摆角更大;远场地震动相比近场地震动所造成的三维隔震结构摇摆角更大;地震动在软土场地条件下相比其在硬土场地条件下所造成的三维隔震结构摇摆角更大。Significant rocking behavior appears in three-dimensional(3D)base isolated structures under earthquake ground motions and it affects the isolation effect of the 3D isolation technology.Different types of earthquake ground motions result in different in⁃fluence effects to the rocking performance of 3D base isolated structures.1567 earthquake ground motions with different characteris⁃tics are selected and classified.A method to evaluate the rocking performance of 3D base isolated structures is proposed based on the ratio of the vertical and horizontal acceleration response spectrum values and it is verified by finite element method.The influ⁃ences of different focal mechanism,epicenter distance and site type on the rocking performance of 3D isolated structure are ana⁃lyzed.The results show that the influences of different focal mechanism,epicenter distance and site type on the rocking of three-di⁃mensional isolated structure are significant.Different types of earthquake ground motions are adjusted to have the same vertical ac⁃celeration response of the structures.In the typical isolation range(i.e.,2.0~5.0 s for horizontal isolation,and 0.3~1.0 s for verti⁃cal isolation),the rocking angle of the 3D isolated structure is larger under reverse fault and strike slip fault earthquakes than that under normal fault earthquakes.It is larger under far-field earthquakes than that under near-field earthquakes,and it is generally larger under the earthquakes in soft soil site than that in hard soil site.

关 键 词：三维隔震 摇摆角 加速度反应谱 震源机制 场地条件 

分 类 号：TU352.12[建筑科学—结构工程]