大跨度拱桥随机地震响应分析
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摘要
基于随机振动理论,研究了大跨度拱桥在不同的地震动空间条件下的平稳随机地震响应特征,分析了局部场地效应、部分相干效应和行波效应对大跨度拱桥地震响应的影响,揭示了地震动空间变化对大跨度拱桥随机地震响应的影响规律。阐明了局部场地效应对大跨度拱桥地震响应的影响与其构造特性、位置、边界条件等因素有关;考虑空间相干效应可减小大跨度拱桥的地震反应;地震内力响应随地震视波速的增大而减少。
Based on the theory of random vibration,the stationary random seismic response characteristics on long-span arch bridge under different condition of the spatical variable ground motions was investigated,and the influence of seismic response on long-span arch bridge under the local site effect,part of coherent effect and traveling wave effect was analysed,then the influence of the spatical variable ground motions on the long-span arch bridge random seismic response was demonstrated.It is showed that the influence of seismic response on long-span arch bridge is relative with its structure characteristics,position,boundary conditions;Considering the part of coherent effect,the seismic response increases insignificantly,while the seismic response of long-span arch bridge show an increasing trend with the seismic shear wave velocities increasing.
Based on the theory of random vibration,the stationary random seismic response characteristics on long-span arch bridge under different condition of the spatical variable ground motions was investigated,and the influence of seismic response on long-span arch bridge under the local site effect,part of coherent effect and traveling wave effect was analysed,then the influence of the spatical variable ground motions on the long-span arch bridge random seismic response was demonstrated.It is showed that the influence of seismic response on long-span arch bridge is relative with its structure characteristics,position,boundary conditions;Considering the part of coherent effect,the seismic response increases insignificantly,while the seismic response of long-span arch bridge show an increasing trend with the seismic shear wave velocities increasing.
引文
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[2]徐兆.多自由度线性阻尼系统的随机振动分析[J].中山大学学报:自然科学版,1984(1):77-82.
[3]苏敏邦,戎海武.Vander Pol-Duffing单边约束系统的随机响应[J].中山大学学报:自然科学版,2009,48(2):20-26.
[4]LU Z H,GE H B,Tsutomu Usami.Applicability of push-over analysis-based seismic performance evaluation pro-cedure for steel arch bridges[J].Engineering Structures,2004,26:1957-1977.
[5]LU Z H,GE H,USAMI T.Applicability of pushover anal-ysis-based seismic performance evaluation procedure forsteel arch bridges[J].Engineering Structures,2004,26:1957-1977.
[6]刘爱荣,张俊平,禹奇才,等.多点激励下大跨度连续刚架拱组合桥的空间地震响应分析[J].暨南大学学报,2007,28(3):246-250.
[7]LIU Airong,ZHANG Junping,YUQicai1.Study of seismicresponse of long span continuous rigid-frame arch bridge[J].Journal of Shenzhen University,2007,24(4):228-233.
[8]LIU Airong,ZHANG Junging,YU Qicai,et al.Study ondynamic properties and traveling wave effeit of XinguangBridge[J].Journal of Guangzhou University,2007,6(4):74-80.
[9]李正英,李正良.空间地震动作用下大跨度拱桥地震响应分析[J].重庆大学学报,2009,32(8):920-924.
[10]丁阳,林伟,李忠献.大跨度空间结构多维多点非平稳随机地震反应分析[J].工程力学,2007,24(3):6-14.
[11]RUIZ P,PENZIEN J.Probabilistic study of the behaviorof structures during earthquakes[C]∥Report No.EE-RC 69-03.California:Earthquake Engineering CenterUniversity of California,1969.
[12]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.
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