桥梁结构地震与温度作用效应组合研究
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摘要
对于双塔斜拉桥和连续刚构等纵向约束较强的桥梁结构,纵向地震作用和温度作用会产生巨大的桥墩弯矩.作为随机性很强的地震作用和温度作用,规范中没有给出明确的温度作用效用组合系数.基于概率方法,建立了桥梁结构在纵向水平地震作用下,考虑温度作用的组合计算模型,利用Turkstra组合方法,考虑地震作用和温度作用的随机概率分布,得到了桥梁结构抗震设计中温度作用效应的组合系数.参数分析表明,温度作用效应的组合系数随组合效应概率分布分位值的增大而减小;随年最高和最低日平均气温出现的概率增大而增大;随地震与温度作用效应的比值增大而减小,当效应比大于6时,温度效应可以忽略.
For the bridges with strong longitudinal restraint,such as double-tower cable-stayed bridges and continuous rigid frame bridges,the longitudinal seismic action and temperature action cause large moments of piers.As the seismic and temperature actions are stochastic,the combination factor considering temperature action effects is needed in anti-seismic design of bridge,but that is not given in the codes.Based on the probability method,the model of combination of seismic action effects and temperature action effects is proposed.Using the Turkstra combination criteria and considering the stochastic probability distribution of seismic and temperature actions,the combination factors of temperature action effects are given for the seismic design of bridge.The parameters analyses show that the combination factor of temperature action effects decreases with increase of the fractile of distribution function and the ratio of seismic action effects and temperature action effects,but it increases with increase of the occurrence probability of the highest and lowest daily average temperature.When the ratio of seismic action effects and temperature action effects is higher than 6,the temperature action effects can be neglected.
For the bridges with strong longitudinal restraint,such as double-tower cable-stayed bridges and continuous rigid frame bridges,the longitudinal seismic action and temperature action cause large moments of piers.As the seismic and temperature actions are stochastic,the combination factor considering temperature action effects is needed in anti-seismic design of bridge,but that is not given in the codes.Based on the probability method,the model of combination of seismic action effects and temperature action effects is proposed.Using the Turkstra combination criteria and considering the stochastic probability distribution of seismic and temperature actions,the combination factors of temperature action effects are given for the seismic design of bridge.The parameters analyses show that the combination factor of temperature action effects decreases with increase of the fractile of distribution function and the ratio of seismic action effects and temperature action effects,but it increases with increase of the occurrence probability of the highest and lowest daily average temperature.When the ratio of seismic action effects and temperature action effects is higher than 6,the temperature action effects can be neglected.
引文
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[2]TURKSTRA C J.Load combination in codestructural design[J].Journal of the StructuralDivision,ASCE,1980,106(2):106-119
[3]PEARCE H T,WEN Y K.Stochastic combination ofload effects[J].Journal of the Structural Division,ASCE,1984,110(7):1613-1629
[4]STLUND L.Loads combination in codes[J].Structural Safety,1993,13(1-2):83-92
[5]HIDA S E.Statistical significance of less commonload combinations[J].Journal of Bridge Engineering,ASCE,2007,12(3):389-393
[6]裴文瑾.地震作用与其他荷载的组合问题[J].地震工程与工程振动,1983,3(1):15-24
[7]赵成刚,尹之潜.地震作用与其他荷载的组合方法[J].地震工程与工程振动,1987,7(3):64-72
[8]洪小健,顾明.一个关于高柔结构顺风向抗风设计中考虑地震作用组合的概率模型及求解[J].应用数学和力学,2006,27(5):555-563
[9]李扬海,鲍卫刚,郭修武,等.公路桥梁结构可靠度与概率极限状态设计[M].北京:人民交通出版社,1997
[10]沈照伟,金伟良,李海波.工程荷载随机过程模型组合方法研究[J].中国海上油气,2005,17(1):57-69
[11]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,5(1):13-22
[12]李铁夫.铁路桥梁可靠度设计[M].北京:中国铁道出版社,2006
[13]中华人民共和国交通运输部.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008
[14]范立础.桥梁抗震[M].上海:同济大学出版社,1997
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