斜拉-悬索协作体系桥基于桩-土-结构相互作用的地震响应研究
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摘要
以大连湾跨海大桥协作体系桥方案为研究对象,基于大型有限元分析软件ANSYS建立了该桥的三维有限元模型,采用等效嵌固模型模拟了土-桩-结构的相互作用,以此为基础对该方案桥的自振特性进行了分析,重点研究了桩-土-结构相互作用下斜拉-悬索协作体系桥的地震响应,分析结果表明自锚式体系的加劲梁与主塔的纵向位移、塔底、主跨跨中弯矩均大于地锚式体系;但加劲梁竖向位移、主塔塔底轴力则小于地锚式体系。
Based on scheme of Dalian gulf cross-sea bridge,in this paper,a 3-dimensional FE model for self-anchored cable-stayed suspension bridge is established with finite element program ANSYS and pile-soil-structure interaction is simulated by use of the equivalent embed fixation model.Based on the FE model,model analysis is carried out and the effects of pile-soil-structure interaction on dynamic behavior of cable-stayed suspension bridge are specially studied.The analysis result show that longitudinal displacement of stiffening beam and tower,moment at bottom of tower and in middle of main span for self-anchored system is more than earth-anchored;but vertical displace of stiffening beam and axial force at bottom of tower is less than earth-anchored system.
Based on scheme of Dalian gulf cross-sea bridge,in this paper,a 3-dimensional FE model for self-anchored cable-stayed suspension bridge is established with finite element program ANSYS and pile-soil-structure interaction is simulated by use of the equivalent embed fixation model.Based on the FE model,model analysis is carried out and the effects of pile-soil-structure interaction on dynamic behavior of cable-stayed suspension bridge are specially studied.The analysis result show that longitudinal displacement of stiffening beam and tower,moment at bottom of tower and in middle of main span for self-anchored system is more than earth-anchored;but vertical displace of stiffening beam and axial force at bottom of tower is less than earth-anchored system.
引文
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[15]陆锐.群桩桥梁结构抗震简化计算方法的比较分析[D].上海:同济大学,2001.
[2]汝诚,贾丽君,薛二乐,等.斜拉-悬索协作体系的设计探索[J].土木工程学报,20003,3(5):46-51.
[3]汝诚,项海帆.斜拉-悬吊协作体系桥力学特性及其经济性能研究[J].中国公路学报1,999,12(3):43-48.
[4]黄海新.自锚式斜拉-悬吊协作体系桥动力响应研究[D].大连:大连理工大学,2006.
[5]王会利.自锚式斜拉-悬索协作体系桥结构性能分析与试验研究[D].大连:大连理工大学2,007.
[6]吴宏业.自锚式斜拉-悬索协作体系桥静力性能分析[D].大连:大连理工大学,2007.
[7]Penzien J,Scheffey C F,Parmelee R A.Seismic analysis of bridgeson long piles[J].ASCE,19649,0(3):223-254.
[8]Cai Y X,Gould P L,Desai C S.Nonlinear analysis of 3D seismicinteraction of soil-pile-structure systems and application[J].Engi-neering Structure,2000,22(2):191-199.
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1996.
[10]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[11]王克海.桥梁抗震研究[M].北京:中国铁道出版社,2007.
[12]Ahn,Gould K L.Soil-Pile-Structure Interaction Effects on theSeismic Response of Cooling Tower[J].Earth-quake Engineeringand Structure Dynamic1,989,18:593-609.
[13]George Gazetas,Ke Fan,Amir Kaynia.Dynamic Response of PileGroups with Different Configurations[J].Soil Dynamics and Earth-quake Engineering,1993(12):239-257.
[14]刘伟岸.大型高桩承台基础的地震反应分析[D].上海:同济大学,2007.
[15]陆锐.群桩桥梁结构抗震简化计算方法的比较分析[D].上海:同济大学,2001.
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