行波激励下大跨度桥梁考虑SSI效应的地震响应分析
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摘要
为了研究行波效应和SSI效应对大跨度钢筋混凝土刚构—连续梁组合桥非线性地震响应的影响规律,选取ElCentro地震波、唐山地震北京波,分析了某六跨钢筋混凝土刚构—连续梁组合桥在一致激励和行波激励下的非线性地震响应,研究了行波效应和SSI效应对该刚构—连续梁组合桥地震响应的影响规律。结果表明,行波效应增大了箱梁的受力,箱梁应力峰值随视波速增大单调递减;行波效应使墩梁固结桥墩的受力和变形呈非单调变化规律,地震响应峰值随视波速增大而先减小后增加;SSI效应增大了桥梁结构地震响应,其峰值随剪切波速增大单调递减;同时考虑行波效应和SSI效应,地震响应峰值随视波速变化曲线的拐点位置和切线斜率均发生改变,其地震响应幅值不是两种效应影响下的简单叠加;行波效应和SSI效应对桥梁地震响应的影响程度随地震波和墩梁约束条件的不同而有所差异。
Nonlinear seismic response analysis of rigid-frame continuous girder combination bridges is conducted considering traveling wave effect and soil-structure interaction. The results show that the seismic responses of the box-section girders increases due to traveling wave effects. However,the dynamic responses of bridge piers perform a non-monotonic variation. The seismic responses of bridge also increase due to SSI. The peak of the responses monotonously decreases as the shear wave velocity increases. When the two factors are simultaneously considered,the inflection points and the tangent slopes of peak amplitude-apparent velocity curves are both changed. The corresponding responses cannot be evaluated by simply superposition on the individual responses due to either traveling wave effects or SSI. The influence magnitudes of traveling wave effects or SSI are different in terms of earthquake waves and the constraints between the beams and bridge piers.
Nonlinear seismic response analysis of rigid-frame continuous girder combination bridges is conducted considering traveling wave effect and soil-structure interaction. The results show that the seismic responses of the box-section girders increases due to traveling wave effects. However,the dynamic responses of bridge piers perform a non-monotonic variation. The seismic responses of bridge also increase due to SSI. The peak of the responses monotonously decreases as the shear wave velocity increases. When the two factors are simultaneously considered,the inflection points and the tangent slopes of peak amplitude-apparent velocity curves are both changed. The corresponding responses cannot be evaluated by simply superposition on the individual responses due to either traveling wave effects or SSI. The influence magnitudes of traveling wave effects or SSI are different in terms of earthquake waves and the constraints between the beams and bridge piers.
引文
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[2]蒋通,田治见宏.地基-结构动力相互作用分析方法:薄层法原理及应用[M].上海:同济大学出版社,2009
[3]Tzanetos N,Elnashai A S,Hamdan F H,et al.Inelastie Dynamic Response of RC Bridges Subjected to Spatial Non-synchronous Earthquake Motion Anlaysis[J].Advances in Structural Engineering,2000,3(3):191~214
[4]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50~53Wang Lei,Zhao Cheng-gang,Wang Zhi-feng.Seismic Response Analysis of Continuous Rigid-framed Bridge with High Piers Considering Topographic Effects and Multi-support Excitations[J].China Civil Engineering Journal,2006,39(1):50~53(in Chinese)
[5]李忠献,黄健,丁阳.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48~53Li Zhong-xian,Huang Jian,Ding Yang.Seismic Responses of Long-span Cable-stayed Bridges under Different Patterns of Earthquake Excitations[J].China Journal of Highway and Transport,2005,18(3):48~53(in Chinese)
[6]SOYLU K K,DUMANOGLU A A,TUNA M E.Random Vibration and Deterministic Analysis of Cablestayed Bridges to Asynchronous Ground Motion[J].Structural Engineering and Mechanics,2004,18(2):231~246
[7]Nutti C,Vanzi I.Influence of Earthquake Spatial Variability on Differential Soil Displacements and SDF System Response[J].Earthquake Engineering and Structure Dynamics,2005,34:1353~1374
[8]Lou L,Zerva A.Effects of Spatially Variable Gound Motions on the Seismic Response of A Skewed,Multispan,RC Highway Bridge[J].Soil Dynamics and Earthquake Engineering,2005,25:729~740
[9]Murat Dicleli,Semih Erhan.Effects of Soil-bridge Interaction on the Magnitude of Internal Force in Integral Abutment Bridge Components Due to Live Load Effects[J].Engineering Structures,2010,32:129~145
[10]Moghaddasi M,Cubrinovski M,Chase J G,et al.Effects of Soil-foundation-structure Interaction on Seismic Structural Response Via Robust Monte Carlo Simulation[J].Engineering Structures,2011,33:1338~1347
[11]Edward H.Stehmeyer,Dimitris C.Rizos.Considering Dynamic Soil Structure Interaction Effects on Seismic Isolation Retrofit Efficiency and the Important of Natural Frequency Ratio[J].Soil Dynamics and Earthquake Engineering,2008,28:468~479
[12]Sextos A G,Pitilakis K D,Kappos A J.Inelastic Dynamic Analysis of RC Bridges Accounting for Spatial Variability of Ground Motion,Site Effects and Soilstructure Interaction Phenomena.Part 2:Parametric Study[J].Earthquake Engineering and Structure Dynamics,2003,32:629~652
[13]闫晓宇.多点激励下大跨度钢筋混凝土桥梁地震响应振动台阵试验研究[D].天津:天津大学博士论文,2013Yan Xiao-yu.Shaking Tables Test on Seismic Responses of Long-span Reinforced Concrete Bridges under Multisupport Excitations[D].Tianjin:Tianjin University,2013(in Chinese)
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