斜拉桥复合地震易损性分析
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摘要
通过引入ANN(artificial neural network,人工神经网络)计算斜拉桥复合地震易损性,显著减少在分析结构能力随机性过程中的计算量,获得结构能力概率分布.采用IDA(incremental dynamic analysis,增量时程分析)非线性时程分析法获得结构需求概率分布.通过蒙特卡洛抽样得到各PGA(peak ground acceleration,地面峰值加速度)下结构失效概率,进而获得易损性曲线.分析结果说明,使用ANN模拟结构能力分布可以显著减少计算量;在考虑结构能力随机性的前提下,斜拉桥地震易损性有所增加.
Computation work decreases dramatically when resorting to artificial neural network(ANN) in analyzing the randomness of structure capacity.The structure demand probability distribution is obtained by using incremental dynamic analysis(IDA) method.Based on the probability distribution of structure capacity and demand,the failure probability under each peak ground acceleration(PGA) is calculated through Monte-Carlo sampling method.And the fragility curves are drawn out.Analysis results indicate that the computation work decreases dramatically due to the employ of ANN to simulate the capacity distribution;and the seismic fragility of cable-stayed bridge increases by taking the randomness of structural capacity into consideration.
Computation work decreases dramatically when resorting to artificial neural network(ANN) in analyzing the randomness of structure capacity.The structure demand probability distribution is obtained by using incremental dynamic analysis(IDA) method.Based on the probability distribution of structure capacity and demand,the failure probability under each peak ground acceleration(PGA) is calculated through Monte-Carlo sampling method.And the fragility curves are drawn out.Analysis results indicate that the computation work decreases dramatically due to the employ of ANN to simulate the capacity distribution;and the seismic fragility of cable-stayed bridge increases by taking the randomness of structural capacity into consideration.
引文
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[2]Hwang H,Jemigan J B,Lin Y W.Evaluation of seismic damage to Memphis bridges and highway systems[J].Journal of Bridge Engineering,2000,5(4):322.
[3]Shinozuka M,Feng M Q,Kim H K,et al.Nonlinear static procedure for fragility curve development[J].Journal of Engineering Mechanics,2000,126(12):1287.
[4]冯清海.特大桥梁地震易损性与风险概率分析[D].上海:同济大学桥梁工程系,2009.FENG Qinghai.Study on seismic vulnerability and risk probability analysis of super-large bridge.[D].Shanghai:Department of Bridge Engineering of Tongji University,2009.
[5]Nielson B G,DesRoches R.Seismic fragility methodology for highway bridges using a component level approach[J].Earthquake Engineering&Structural Dynamics,2007,36(6):823.
[6]Alipour A,Shafei B,Shinozuka M.Performance evaluation of deteriorating highway bridges located in high seismic areas[J].Journal of Bridge Engineering,2010,16(5):597.
[7]Casciati F,Cimellaro G P,Domaneschi M.Seismic reliability of a cable-stayed bridge retrofitted with hysteretic devices[J].Computers&Structures,2008,86(17):1769.
[8]Choi E,DesRoches R,Nielson B.Seismic fragility of typical bridges in moderate seismic zones[J].Engineering Structures,2004,26(2):187.
[9]Mazzoni S,McKenna F,Scott M H,et al.OpenSees command language manual[M].Berkeley:Pacific Earthquake Engineering Research(PEER)Center,2006.
[10]Wen Y K,Ellingwood B R,Veneziano D,et al.Uncertainty modeling in earthquake engineering[R].[S.1.]:Mid-America Earthquake Center,2003.
[11]Vamvatsikos D.Seismic performance,capacity and reliability of structures as seen through incremental dynamic analysis[D].Stanford:Stanford University,2002.
[12]韩力群.人工神经网络教程[M].北京:北京邮电大学出版社,2006.HAN Liqun.Instruction book of artificial neural network[M].Beijing:Beijing University of Posts and Telecommunications Press,2006.
[13]肖刚,李天柁.系统可靠性分析中的蒙特卡罗方法[M].北京:科学出版社,2003.XIAO Gang,LI Tiantuo.Monte Carlo Method in system reliability analysis[M].Beijing:Science Press,2003.
[14]金良超.正交设计与多指标分析[M].北京:中国铁道出版社,1988.JIN Liangchao.Orthogonal design and multi-index analysis[M].Beijing:China Railway Publishing House,1988.
[15]Scott B D,Park R,Priestley M J N.Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates[J]//ACI Journal Proceedings,1982,79(1):13.
[16]Barbate M,Gu Q,Conte J P.Probabilistic push-over analysis of structural and soil-structure systems[J].Journal of Structural Engineering,2010,136(11):1330.
[17]Stone WC,Taylor A W.Seismic performance of circular bridge columns designed in accordance with AASHTO/CALTRANS standards[M].[S.1.]:National Institute of Standards and Technology of U S Department of Commerce,1993.
[18]Yang C S,DesRoches R,Padgett J E.Fragility curves for a typical California box girder bridge[C]//Proceedines of TCLEE 2009 ASCE Technical Council on Lifeline Earthquake Engineering.Reston:ASCE,2009:1-12.
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