多点激励下LRB隔震桥梁地震反应分析
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摘要
研究了地震地面运动多点激励,即空间变化效应对装有铅芯橡胶支座(Lead Rubber Bearing)的连续梁桥地震反应的影响。首先,利用三角级数法生成了拟合规范反应谱的多点人工地震动时程;然后利用非线性时程分析法数值仿真并比较了某五跨LRB隔震连续梁桥在一致激励、仅考虑地震动行波效应、仅考虑地震动部分相干效应、同时考虑行波和部分相干效应以及同时考虑行波、部分相干和局部场地土效应等七种工况下结构的减震效果。行波效应和部分相干效应对铅芯橡胶支座隔震桥梁影响不大,而局部场地土效应对该类桥梁的地震反应分析影响很大,应该引起重视。
In the paper the influence of spatially ground motion on the longitudinal seismic response of isolated bridge with LRB(Lead Rubber Bearing) is presented. Nonlinear element models are created for the bridge and nonlinear time history analysis is conducted. First, artificial earthquake motion being compatible with code response spectrum is generated using spectral representation method. Structural vibration mitigation effects are compared each other under seven working conditions of excitation ,which uniform excitation, non-uniform excitation considering only wave passage effect, only incoherence effect, non-uniform excitation considering both the wave passage effect and incoherence effect, and non-uniform excitation considering wave passage effect, incoherence effect and local site effect are included. For the medium and small span bridge isolated with LRB, the wave passage effect and incoherent effect are not significant, and can be ignored for simplicity. But the local site effect has significant effect on the seismic response of the isolated bridge, and must be considered in the seismic response analysis.
In the paper the influence of spatially ground motion on the longitudinal seismic response of isolated bridge with LRB(Lead Rubber Bearing) is presented. Nonlinear element models are created for the bridge and nonlinear time history analysis is conducted. First, artificial earthquake motion being compatible with code response spectrum is generated using spectral representation method. Structural vibration mitigation effects are compared each other under seven working conditions of excitation ,which uniform excitation, non-uniform excitation considering only wave passage effect, only incoherence effect, non-uniform excitation considering both the wave passage effect and incoherence effect, and non-uniform excitation considering wave passage effect, incoherence effect and local site effect are included. For the medium and small span bridge isolated with LRB, the wave passage effect and incoherent effect are not significant, and can be ignored for simplicity. But the local site effect has significant effect on the seismic response of the isolated bridge, and must be considered in the seismic response analysis.
引文
[1]范立础,王志强.桥梁减隔震设计[M].北京,人民交通出版社,2001.
[2]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.
[3]Tzanetos N.,Elnashai,etc.Inelastic dynamic response of RC bridges subjected to spatial non-synchronous earthquake motion[J].Advances instructural engineering,2000,3(3):191-214.
[4]Kim S H,Feng MQ.Fragility analysis of bridges under ground motion with spatial variation[J].Journal of nonlinear mechanics,2003,38(5):705-721.
[5]Lou L,Zerva A.Effects of spatially variable ground motions on the seismic response of a skewed,multi-span,RC highway bridge[J].Soil Dy-namics and Earthquake Engineering,2005,25(10):729-740.
[6]Ates S.,Bayraktar.Stochastic response of seismically isolated highway bridges with friction pendulum systems to spatially varying earthquakeground motions[J].Engineering Structures,2005,27(12):1843-1858.
[7]江宜城,杨德喜,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,26(1):104-107.
[8]Hao H,Oliveira C S,Penzien J.Multiple-station ground motion processing and simulation based on smart-1 array data[J].Nuclear Engineer-ing and Design 1989,111(3):293-310.
[9]Deodatis G.Non-stationary stochastic vector processes:seismic ground motion applications[J].Probabilistic Engineering Mechanics,1996,11(3):149-168.
[10]张治勇,孙柏涛,宋天舒.新抗震规范地震动功率谱模型参数的研究[J].世界地震工程,2000,16(3):33-38.
[11]Harichandran R S,Vanmarke E H.Stochastic variation of earthquake ground motion in space and time[J].Journal of Engineering Mechanics,1986,112(2):154-175.
[12]潘晓东.非平稳随机地震下堤坝非线性有效应力动力响应可靠度分析[D].浙江大学,2004.
[2]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.
[3]Tzanetos N.,Elnashai,etc.Inelastic dynamic response of RC bridges subjected to spatial non-synchronous earthquake motion[J].Advances instructural engineering,2000,3(3):191-214.
[4]Kim S H,Feng MQ.Fragility analysis of bridges under ground motion with spatial variation[J].Journal of nonlinear mechanics,2003,38(5):705-721.
[5]Lou L,Zerva A.Effects of spatially variable ground motions on the seismic response of a skewed,multi-span,RC highway bridge[J].Soil Dy-namics and Earthquake Engineering,2005,25(10):729-740.
[6]Ates S.,Bayraktar.Stochastic response of seismically isolated highway bridges with friction pendulum systems to spatially varying earthquakeground motions[J].Engineering Structures,2005,27(12):1843-1858.
[7]江宜城,杨德喜,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,26(1):104-107.
[8]Hao H,Oliveira C S,Penzien J.Multiple-station ground motion processing and simulation based on smart-1 array data[J].Nuclear Engineer-ing and Design 1989,111(3):293-310.
[9]Deodatis G.Non-stationary stochastic vector processes:seismic ground motion applications[J].Probabilistic Engineering Mechanics,1996,11(3):149-168.
[10]张治勇,孙柏涛,宋天舒.新抗震规范地震动功率谱模型参数的研究[J].世界地震工程,2000,16(3):33-38.
[11]Harichandran R S,Vanmarke E H.Stochastic variation of earthquake ground motion in space and time[J].Journal of Engineering Mechanics,1986,112(2):154-175.
[12]潘晓东.非平稳随机地震下堤坝非线性有效应力动力响应可靠度分析[D].浙江大学,2004.
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