大跨度新型桥梁地震动力可靠度分析
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摘要
通过分析两座新型桥梁的地基情况和结构特点,指出了动力可靠性研究的必要性.基于地基土卓越周期公式,根据可靠度理论建立了极限状态方程和功能函数,以剪切波速为随机变量进行了统计分析和分布假设检验,检验结果表明,剪切波速符合正态分布.提出了大跨度新型桥梁可靠度计算步骤,编制了电算程序,计算得到了两座新型桥梁的可靠度指标,柳林桥为4.70,吉兆桥为4.75,表明两座新型桥梁满足结构动力可靠度的要求,采用的方法可为类似工程结构的研究提供参考.
Through analysis of the ground condition and structural characteristic of two new-pattern bridges,the necessary to carry out the research on dynamic reliability under earthquake was indicated. Considering the eigen period formula of ground,limit state equation and functional function were established based on the reliability theory. Statistical parameter of wave shear velocity from geological exploration was calculated and its distribution checked which was testified to be of Gaussian distribution. Furthermore,zooming procedure was programmed with reliability theory to calculate the possibility of earthquake resonance disaster. Result indicated that the reliable index of Liulin Bridge was 4.70 and that of Jizhao Bridge was 4.75. It could be concluded that both new-pattern bridges meet the requirement of structural dynamic reliability to avoid earthquake resonance disaster. The method is a reference for researches of similar engineering structures.
Through analysis of the ground condition and structural characteristic of two new-pattern bridges,the necessary to carry out the research on dynamic reliability under earthquake was indicated. Considering the eigen period formula of ground,limit state equation and functional function were established based on the reliability theory. Statistical parameter of wave shear velocity from geological exploration was calculated and its distribution checked which was testified to be of Gaussian distribution. Furthermore,zooming procedure was programmed with reliability theory to calculate the possibility of earthquake resonance disaster. Result indicated that the reliable index of Liulin Bridge was 4.70 and that of Jizhao Bridge was 4.75. It could be concluded that both new-pattern bridges meet the requirement of structural dynamic reliability to avoid earthquake resonance disaster. The method is a reference for researches of similar engineering structures.
引文
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[2]郝敏,谢礼立,李伟.从集集地震看建筑物震害与地震动参数的关系[J].地震工程与工程振动,2005,25(6):12-15.Hao Min,Xie Lili,Li Wei.Study on relationship be-tween building damage and ground motion parameters from Chi-Chi earthquake[J].Earthquake Engineering and Engineering Vibration,2005,25(6):12-15(in Chinese).
[3]刘俊杰,王家全.场地卓越周期的讨论与场地建筑的共振现象[J].广西工学院学报,2005,16(3):47-50.Liu Junjie,Wang Jiaquan.The discussion of predomi-nant period of site and resonance phenomenon of the site building[J].Journal of Guangxi University of Technol-ogy,2005,16(3):47-50(in Chinese).
[4]Tehranizadeh M.Dynamic behavior of tall building soil-structure interaction[C]//Advances in Civil and Struc-tural Engineering Computing for Practice.Edinburgh:Civil-Comp Press,1998:281-288.
[5]谭振东,王广东,张宇,等.基于逼近算法的结构共振震害定量风险分析[J].辽宁工程技术大学学报,2007,26(5):697-699.Tan Zhendong,Wang Guangdong,Zhang Yu,et al.Quantitative risk analysis of structure resonance disaster during earthquake based on approximation algorithm[J].Journal of Liaoning Technical University,2007,26(5):697-699(in Chinese).
[6]Christensen Thoft,Baker M J.Structural ReliabilityTheory and Its Applications[M].Berlin:Springer Ver-lag,1982.
[7]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1996.Li Guohao.Stability and Vibration of Bridge Structures[M].Beijing:China Railway Publishing House,1996(in Chinese).
[8]窦远明,刘晓立,赵少伟,等.砂垫层隔震性能的试验研究[J].建筑结构学报,2005,26(1):125-128.Dou Yuanming,Liu Xiaoli,Zhao Shaowei,et al.An experimental study of isolating properties of sand cush-ion[J].Journal of Building Structures,2005,26(1):125-128(in Chinese).
[9]Rahman M S,Ei Zahaby,Khalid M.Probabilistic liq-uefaction risk analysis including fuzzy variables[J].Soil Dynamics and Earthquake Engineering,1997,16(1):63-79.
[10]Yu X P,Togashi H.Oscillations in a coupled bay-river system.2.Numerical method[J].Coastal Engineering,1996,28(1/2/3/4):165-182.
[11]Berrill J B,Davis R O.Energy dissipation and seismic liquefaction of sands:Revised model[J].Soils and Foundations,1985,25(2):106-118.
[12]Baziar M H,Ghorbani A.Evaluation of lateral spread using neural-networks[J].Soil Dynamics and Earth-quake Engineering,2005,25(1):1-10.
[13]Pawlak Z.Rough sets[J].International Journal of Paral-lel Programming,1982,5(11):341-356.
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