社区尺度斜入射波场下场地-建筑群耦合作用模拟方法  

A simulation approach for solving the site-city-interaction effects under oblique incident waves on a community-scale

作　　者：巴振宁[1,2,3] 付继赛 王方博 梁建文[1] 牛嘉琪 BA Zhenning;FU Jisai;WANG Fangbo;LIANG Jiamen;NIU Jiaqi(School of Civil Engineering,Tianjin University,Tianjin 300354,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education,Tianjin University,Tianjin 300350,China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300354 [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 [3]天津大学中国地震局地震工程综合模拟与城乡抗震韧性重点实验室,天津300350

出　　处：《振动与冲击》2024年第4期1-11,37,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金(U2139208;52178495);天津市研究生科研创新项目(2022BKY054);2023年度天津大学优秀博士学位论文培育基金。

摘　　要：场地-城市相互作用(site-city interaction,SCI)效应会显著改变场地地震波场分布及建筑反应,基于SCI效应理论计算研究方法的发展现状,发挥谱元(spectral element,SE)法可快速高效求解三维地震波场传播和多自由度(multi-degree of freedom,MDOF)模型计算量小且可同时模拟大量建筑的优势,同时,结合频率波数域(frequency wave number analysis,FK)方法,以等效地震荷载的方式施加地震波场,建立了FK-SE-MDOF耦合方法,实现了SE-MDOF耦合模型中多种波型(P波、SV波和SH波)的斜入射输入,解决了当前三维SCI效应研究方法中未能同时考虑建筑非线性、频谱特性、地震波波型及入射角度影响的问题。首先对方法原理进行了介绍;然后,通过与振动台试验的对比,验证了方法的正确性;进而,采用该方法建立理想场地-城市建筑群相互作用耦合模型,主要探讨了入射角度和地震波波型对SCI效应的影响,得到了一些有益结论。该方法较为真实地反映SCI效应影响的同时,可反映建筑基础轮廓对地震波场的影响,适用于需考虑建筑轮廓信息的社区尺度SCI效应研究,可为城市规划、抗震设计、风险评估以及震后救援等工作提供定量指导。Site-city interaction(SCI)effect may drastically modify the seismic wave field and the response of buildings.Based on the development status of SCI effect simulation approach,taking advantages of the spectral element(SE)method and the multi-degree of freedom(MDOF)model,(i.e.,SE methool can efficiently simulate the threedimensional seismic wave field propagation,and MDOF can simulate a large number of buildings at the same time),and combining with the frequency wave number analysis(FK)method to input the seismic wave field by applying equivalent seismic loads,the FK-SE-MDOF approach was established.The approach can simulate the oblique incidence input of multiple wave-types(P,SV and SH)in the SE-MDOF coupling model,and solved the problem that the influence of nonlinear characteristics of buildings,spectrum characteristics,seismic wave-type and incidence angle cannot be considered simultaneously in previous three-dimensional SCI effect simulations.Firstly,the theory of the approach was introduced;Then,the correctness of the approach was verified by simulating an existing shaking table test.Furthermore,a series of ideal site-city-interaction models were established,and the influence of incident angle and wave-type on SCI effect was mainly discussed.Finally,some useful conclusions were obtained.The approach can realistically reflect the impact of SCI effects while reflecting the influence of building foundation contours on the seismic wave field.It is suitable for community-scale buildings where it is necessary to consider foundation contour information and can provide quantitative guidance for urban planning,seismic design,risk assessment,and post-earthquake rescue.

关 键 词：场地-城市相互作用(SCI) 频率波数域-谱元-多自由度模型(FK-SE-MDOF)方法 斜入射 建筑群 社区尺度 

分 类 号：TU435[建筑科学—岩土工程]