考虑SSI及地形效应的整体渡槽隔震性能分析  

Seismic isolation analysis of integrated aqueduct considering soil-structure interaction and topographic effect

作　　者：韩钟骐 敖选年 蒋继彬 王海深 潘鹏[1,3] HAN Zhongqi;Ao Xuannian;JIANG Jibin;WANG Haishen;PAN Peng(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Central Yunnan Water Diversion Engineering Co.,Ltd.,Kunming 650000,China;Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education of China,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]云南省滇中引水工程有限公司,昆明650000 [3]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2024年第7期1090-1099,共10页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划项目(2021YFB2600502);云南省重大科技专项计划项目(202102AF080001)。

摘　　要：该文以滇中引水工程松林渡槽为例,分析了桩土相互作用(soil-structure interaction,SSI)及地形效应(主要为V形河谷效应)对隔震渡槽结构地震响应的影响。采用大型通用有限元软件ABAQUS建模,通过m法及等效刚度桩考虑SSI,采用简化弹簧质量模型考虑流固耦合作用。结果表明:考虑SSI后,槽墩变形、槽段间相对位移及支座变形有所增大,其中支座变形接近设计限值,有破坏风险。考虑在V形河谷效应下水平偏振横波相对于水平面不同入射角的工况中,渡槽结构响应的大小依次为:水平入射、45°斜入射、一致输入、垂直入射,其中45°斜入射与一致输入相近;段间相对位移及支座顺槽向显著变形,为设计关注重点。[Objective]An aqueduct is a simply supported bridge-like structure whose main purpose is to transport water over long-distance and difficult terrains.When an aqueduct is constructed in seismically active regions,base-isolation is often needed.However,current research on aqueducts that considers both the pier-soil interaction and topographic effects is lacking.This paper theoretically analysis the influences of pier-soil interaction and topographic effects(mainly V-shaped canyon effect)on the base-isolated Songlin aqueduct of Central Yunnan Water Division Project during an earthquake event.[Methods]The analysis is achieved through modelling using the universal large-scale finite element analysis(FEA)software ABAQUS.The soil-structure interaction(SSI)is simulated through m-method and the equal-stiffness pier method according to relevant standard and research,respectively.The m-method simplifies the SSI as a series of springs.The stiffness of each spring is related to the pier geometries and soil thickness considered.The fluid-structure interaction is simulated through simplified spring-mass model,which is a commonly used analytical model to simulate fluid-structure interaction.In this paper,the spring-mass model is modified for computational efficiency.The results of the modified and traditional spring-mass model are compared to verify the effectiveness of the modified model.The FEA model mainly consists of beam elements and the popular user-defined material database PQ-fiber is adopted in the analysis.Post-tensioning of the aqueduct is achieved through temperature-gradient and material expansion coefficient in ABAQUS.Three-dimensional earthquake actions selected from PEER database are inputted at the pier base of the model as accelerations to simulate the dynamic structural responses of the aqueduct.The V-shaped canyon effect is considered by transforming the time-history and peak ground acceleration(PGA)of the earthquake records.[Results]The structure periods of aqueduct were 2.81,1.72 and 1.40 s for the first th

关 键 词：渡槽 桩土相互作用 地形效应 有限元模拟 隔震 

分 类 号：TV672.3[水利工程—水利水电工程] TV312