考虑温度相关性的LRB隔震桥梁地震响应分析
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摘要
系统地研究了铅芯橡胶隔震支座的温度相关性,以及支座温度相关性对隔震桥梁地震响应的影响。试验温度的变化范围为-40℃至50℃,通过拟静力试验的滞回曲线测定了支座在不同温度下的屈前刚度、屈后刚度和屈服剪力。根据所测得的试验数据,采用回归分析,得出了支座的温度影响相关系数函数。建立了LRB隔震桥梁的力学模型,分析了考虑支座温度相关性对隔震桥梁地震响应的影响。比较了不同温度下支座滞回的计算结果。对比分析了不同温度下,隔震梁桥墩顶剪力、梁位移和梁加速度的计算结果,得出了若不考虑支座的温度效应墩顶剪力和梁加速度会有较大的误差,而温度效应对梁位移影响较小的结论。
The temperature properties of LRB used in isolated bridges were studied.The seismic response of isolated bridges considering temperature effect were focused.The range of temperature is from-40℃ to 50℃ and the characteristics of LRB under different temperature environmental conditions were measured through quasi-static testing.Based on experimental results and using regression analysis,the correlation function between LRB and temperature was derived.A numerical model of isolated bridges under seismic excitation taking into account the effect of LRB was presented.From the comparative analysis of the results of pier shear,deck drift and deck acceleration,it is indicated that if temperature effect is unconsidered,higher deviation will take place in the results of pier shear and deck acceleration,nevertheless,deck drift is of less influence.
The temperature properties of LRB used in isolated bridges were studied.The seismic response of isolated bridges considering temperature effect were focused.The range of temperature is from-40℃ to 50℃ and the characteristics of LRB under different temperature environmental conditions were measured through quasi-static testing.Based on experimental results and using regression analysis,the correlation function between LRB and temperature was derived.A numerical model of isolated bridges under seismic excitation taking into account the effect of LRB was presented.From the comparative analysis of the results of pier shear,deck drift and deck acceleration,it is indicated that if temperature effect is unconsidered,higher deviation will take place in the results of pier shear and deck acceleration,nevertheless,deck drift is of less influence.
引文
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[2]Thomas B.Material mechanical property behavior ofmaintenance-free rubber-metal bearings[J.]Materialpruefung/Materials Testing,1989,31:241-244.
[3]Nakano O,Taniguchi H,Nishi H.Effect of temperature onthe dynamic behavior of base-isolated bearings[C].Proceedings of the 24th Joint Meeting on Wind and SeismicEffects,American.Inst of Standards&Technology,1992.
[4]尹维祥.叠层橡胶支座稳定性极其受低温环境的影响[D].兰州:甘肃工业大学,2001:54-69.
[5]李慧,邓学晶,杜勇锋,等.寒区叠层橡胶隔震支座拟静力试验研究[J].低温建筑技术,2003,4:33-35.
[6]Ghasemi H,Higgins M S.Sizing up seismic bearings[J].Civil Engineering,1999,69(7):54-59.
[7]由世岐,刘斌,楼永林.低温环境对叠层橡胶支座变形特性影响的试验研究[J].东北大学学报(自然科学版),2005,26(3):297-299.
[8]Ahn I S,Chen S S.Nonlinear model-based system identifica-tion of lead-rubber bearings[J].Journal of Structural Engi-neering,2008,134(2):318-328.
[9]Kalpakidis I V,Constantinou M C.Effects of heating on thebehavior of lead-rubber bearings.Ⅰ:theory[J].Journal ofStructural Engineering,2009,135(12):1440-1449.
[10]Kalpakidis I V,Constantinou M C.Effects of heating on thebehavior of Lead-rubber bearings.Ⅱ:verification of theory[J].Journal of Structural Engineering,2009,135(12):1450-1461.
[11]JTGD60-2004.公路桥涵设计通用规范[S].北京:人民交通出版社2,004.
[12]GB20688.1-2007.橡胶支座:第1部分隔震橡胶支座试验方法[S].北京:中国标准出版社,2007.
[13]GB20688.2-2006.橡胶支座:第2部分桥梁隔震橡胶支座[S].北京:中国标准出版社2,006.
[14]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129.
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