基础条件对SSDI体系动力特性的影响
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摘要
基于影响土-结构动力相互作用(SSDI)体系抗震性能和动力特性的因素除地基土特性与上部结构特性外,基础作为联系上部结构和土体的桥梁,其构造形式以及埋置深度对SSDI体系动力性能的影响不可忽视。通过采用有限元方法,对某工程高层建筑算例进行计算分析;利用ANSYS程序中重新启动法、APDL参数设计语言编制程序实现对地基土的非线性模拟,并通过土体边界、土体与结构间非线性接触的研究,对整个SSDI体系在实测地震波作用下的动力反应进行计算分析,研究桩筏基础、桩箱基础2种不同基础形式以及不同基础埋深条件对上部结构动力反应效应的影响。研究结果表明:桩箱基础条件时上部结构动力反应较小,基础埋深越大,上部结构动力反应越小。研究成果为工程抗震设计考虑基础条件对土-结构动力相互作用效应的影响提供了理论依据,对完善抗震设计规范具有参考价值。
Based on the fact that the influence factors of dynamic characteristics and aseismic capability for soil-structure-dynamic-interaction(SSDI) system include the soil characteristics and structural characteristics,and the foundation acted as a bridge associating structure with soil,its forms,as well as embedded depth cannot be ignored.Using the ANSYS program of finite element method,non-linear simulation of the soil and dynamic responses of SSDI system was achieved with restart method,APDL parameter design language program and simulating soil boundaries,soil and structure nonlinear contact under the action of seismic waves was measured.Many issues were studied such as the changes of the structural dynamic characteristics under pile-raft foundation and pile-box foundation conditions,as well as the dynamic response effects of upper structure in different foundation embedments.The results show that dynamic response of upper structure is small in pile-box foundation condition,and the foundation embedment is bigger,the upper structure dynamic response is smaller.Theoretical evidence is provided for the seismic design by considering foundation conditions of soil-structure-dynamic-interaction system,and the research results have reference value for the code of seismic design.
Based on the fact that the influence factors of dynamic characteristics and aseismic capability for soil-structure-dynamic-interaction(SSDI) system include the soil characteristics and structural characteristics,and the foundation acted as a bridge associating structure with soil,its forms,as well as embedded depth cannot be ignored.Using the ANSYS program of finite element method,non-linear simulation of the soil and dynamic responses of SSDI system was achieved with restart method,APDL parameter design language program and simulating soil boundaries,soil and structure nonlinear contact under the action of seismic waves was measured.Many issues were studied such as the changes of the structural dynamic characteristics under pile-raft foundation and pile-box foundation conditions,as well as the dynamic response effects of upper structure in different foundation embedments.The results show that dynamic response of upper structure is small in pile-box foundation condition,and the foundation embedment is bigger,the upper structure dynamic response is smaller.Theoretical evidence is provided for the seismic design by considering foundation conditions of soil-structure-dynamic-interaction system,and the research results have reference value for the code of seismic design.
引文
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[17]孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004:88-126.SUN Jing.Laboratory experimental and application study on dynamic shear modulus ratio and damping ratio of soils[D].Harbin:China Seismological Bureau.Institute of Engineering Mechanics,2004:88-126.
[18]夏栋舟.土-结构动力相互作用(SSDI)体系阻尼性能及其地震反应分析与研究[D].长沙:湖南大学土木工程学院,2009:23-118.XIA Dong-zhou.Research on damping properties and seismic response of soil-structure-dynamic-interaction(SSDI)system[D].Changsha:Hunan University.College of Civil Engineering,2009:23-118.
[19]李培振.结构-地基动力相互作用体系的振动台试验及计算模拟分析[D].上海:同济大学结构工程与防灾研究所,2002:91-125.LI Pei-zhen.The computational analysis and shaking table test for soil-structure interaction system[D].Shanghai:Tongji University.Research Institute of Structural Engineering and Disaster Reduction.2002:91-125.of reinforced earth retaining wall[C]//Proc 11 WCEE.1996:
[2]曹志远.结构与介质相互作用理论及其应用[M].南京:河海大学出版社,1993:1-21.CAO Zhi-yuan.Theory and application for structure and medium interaction[M].Nanjing:Hohai University Press,1993:1-21.
[3]Novak M,Hifanwy L E L.Effect of soil-structure interaction on damping of structures[J].Earth Eng And Struct Dyn,1983,11:595-621.
[4]Stewart J P,Seed R B,Fenves G L.Seismic soil-structure interaction in building(Ⅰ):Analytical methods[J].Geotechnical and Geoenvironmental Engineering,1999,9:38-48.
[5]Enrique L J.A simple model for structural control including soil-structure interaction effects[J].Earthquake Engineering and Structural Dynamics,1998,27(3):225-242.
[6]Allison S H.Effective optimal structural control of Soil-Structure Interaction systems[J].Earthquake Engineering and Structural Dynamics,1997,26(5):549-570.
[7]Oliveto G,Santini A.Time domain response of a one-dimensional soil-structure interacting model via complex analysis[J].Engineering Structures,1996,18:425-436.
[8]Humar J L,Bagchi A,Xia H.Frequency domain analysis of soil-structure interaction[J].Computer and Structure,1998,66(23):337-351.
[9]Javier A,Martha S.Effective periods and damping of building-foundation systems including seismic wave effects[J].Engineering Structures,2002,24:553-562.
[10]Raychowdhury P.Seismic response of low-rise steel moment-resisting frame(SMRF)buildings incorporating nonlinear soil-structure interaction[J].Engineering Structures,2011,33(3):958-967.
[11]Futaki M,Tseng W S.Experiments about seismic performance 1083.
[12]Hadjian A H,Tseng W S,Chang C Y,et al.罗东(台湾)土-结构相互作用大比例模型试验的启示(I)[J].谢君斐,译.世界地震工程,1993(3):41-52.Hadjian A H,Tseng W S,Chang C Y,et al.Luodong(Taiwan)soil structure interaction of large scale model test of the enlightenment(Ⅰ)[J].XIE Jun-fei,transl.World Earthquake Engineering,1993(3):41-52.
[13]Hadjian A H,Tseng W S.罗东(台湾)土-结构相互作用大比例模型试验的启示(Ⅱ)[J].谢君斐,译.世界地震工程,1993(4):49-59.Hadjian A H,Tseng W S.Luodong(Taiwan)soil structure interaction of large scale model test of the enlightenment(Ⅱ)[J].XIE Jun-fei,transl.World Earthquake Engineering,1993(4):49-59.
[14]Wolf J P.Approximate dynamic model of embedded foundation in time domain[J].Earthquake Engineering and Structure Dynamics,1986,14:683-703.
[15]何益斌,夏栋舟,黄欣荣,等.土-桩-框架结构动力相互作用非线性有限元模拟[J].沈阳建筑大学学报:自然科学版,2008,24(3):428-432.HE Yi-bin,XIA Dong-zhou,HUANG Xin-rong,et al.Nonlinear finite element analysis of soil-pile-frame structure-interaction system[J].Journal of Shenyang Jianzhu University:Natural Science,2008,24(3):428-432.
[16]何益斌,夏栋舟,闫岩,等.基于场地土非线性性质的SSDI体系动力特性研究[J].岩土工程学报,2009,31(4):521-527.HE Yi-bin,XIA Dong-zhou,YAN Yan,et al.Dynamic behaviors of SSDI system based on nonlinearity of soil in site[J].Chinese Journal of Geotechnical Engineering,2009,31(4):521-527.
[17]孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004:88-126.SUN Jing.Laboratory experimental and application study on dynamic shear modulus ratio and damping ratio of soils[D].Harbin:China Seismological Bureau.Institute of Engineering Mechanics,2004:88-126.
[18]夏栋舟.土-结构动力相互作用(SSDI)体系阻尼性能及其地震反应分析与研究[D].长沙:湖南大学土木工程学院,2009:23-118.XIA Dong-zhou.Research on damping properties and seismic response of soil-structure-dynamic-interaction(SSDI)system[D].Changsha:Hunan University.College of Civil Engineering,2009:23-118.
[19]李培振.结构-地基动力相互作用体系的振动台试验及计算模拟分析[D].上海:同济大学结构工程与防灾研究所,2002:91-125.LI Pei-zhen.The computational analysis and shaking table test for soil-structure interaction system[D].Shanghai:Tongji University.Research Institute of Structural Engineering and Disaster Reduction.2002:91-125.of reinforced earth retaining wall[C]//Proc 11 WCEE.1996:
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