进水塔基岩远域能量逸散数值模拟研究

英文篇名：Simulation of Far Field Energy Dissipation for Intake Tower Bedrock
中文刊名：工程抗震与加固改造
英文刊名：Earthquake Resistant Engineering and Retrofitting
作者：陈震 ; 赵顺波
英文作者：Chen Zhen ; Zhao Shun-bo(School of Civil Engineering and Communication ; North China Institute of Water Conservancy and Hydroelectric Power ; Zhengzhou 450011 ; China)
中文关键词：进水塔 ; 波动理论 ; 固定边界 ; 粘性人工边界 ; 粘弹性人工边界 ; 地震波
英文关键词：intake tower ; wave motion theories ; fixed boundary model ; viscous artificial boundary ; visco-elastic artificial boundary ; seismic wave
出版日期：2012-06-05
机构：华北水利水电学院土木与交通学院;
年：2012
期：03
出版单位：工程抗震与加固改造

摘要

在高耸结构、高坝等重大水工结构抗震动力分析中,多采用无质量固定边界模型模拟地基的影响,该模型引入了不真实的反射地震波。大量工程实践表明,刚性地基假定不尽合理,无限地基能量辐射效应的影响应予以重视,结构体系的动力反应分析应归结为开放系统中的近场波动问题。本文基于波动理论分别采用粘性人工边界和粘弹性人工边界模拟地震波的远域能量逸散效应,进而削弱固定边界虚假反射地震波的影响,并将计算结果与固定边界模型进行比较。研究结果对类似工程抗震动力分析中边界条件的选取具有一定的参考意义。
In the traditional structures seismic dynamic analysis of high-rise structure,dam and other major hydraulic structures fixed boundary model are used and the mass of foundation is not considerd,which introduces nonexistent reflection seismic wave.Large number of engineering practices show that fixed boundary model assumption is not perfectly reasonable,which should concern the effect of bedrock field energy dissipation.Dynamic analysis of structural system should be attributed to the open system near field wave motion.In order to eliminate impact of fixed boundary and consider seismic performance of intake tower,viscous boundary and visco-elastic artificial boundary are used to simulate bedrock field energy dissipation,and the calculated results are compared with fixed boundary model.The numerical simulation results are practical significant to selection of boundary conditions in seismic dynamic analysis of similar projects.

引文

[1]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002Liao Zhen-peng.Introduction to Wave Motion Theories forEngineering[M].Beijing:Science Press,2002(inChinese)
    [2]Millan M A,Young Y L,Prevost J H.Seismic Responseof Intake Towers Including Dam-tower Interaction[J].Earthquake Engineering and Structural Dynamics,2009,38(3):307～329
    [3]Goyal A,Chopra A K.Hydrodynamic and FoundationInteraction Effects in Dynamic of Intake Towers:Frequency Response Functions[J].Journal of StructuralEngineering,1989,115(6):1371～1385
    [4]Goyal A,Chopra A K.Hydrodynamic and FoundationInteraction Effects in Dynamic of Intake Towers:Earthquake Responses[J].Journal of StructuralEngineering,1989,115(6):1386～1395
    [5]Lysmer J,Kuhlemeyer R L.Finite Dynamic Model forInfinite Media[J].Journal of Engineering Mechanics,ASCE,1969,95(1):759～877
    [6]Deeks A J,Randolph M F.Axisymmetric Time-domainTransmitting Boundaries[J].Journal of EngineeringMechanics,1994,120(1):25～42
    [7]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55～64Liu Jing-bo,Lv Yan-dong.A Direct Method for Analysisof Dynamic Soil-structure Interaction[J].China CivilEngineering Journal,1998,31(3):55～64(in Chinese)
    [8]杜修力,赵密,王进廷.近场波动模拟的应力人工边界条件[J].力学学报,2006,38(1):49～56Du Xiu-li,Zhao Mi,Wang Jin-ting.A Stress ArtificialBoundary in FEA for Near-field Wave Problem[J].Chinese Journal of Theoretical and Applied Mechanics,2006,38(1):49～56(in Chinese)