板式橡胶支座滑动的地震响应分析
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摘要
支座是桥梁中的支承部分,是连接桥梁上部结构和下部结构的重要构件,板式橡胶支座常直接放置于墩顶,水平力传递完全靠接触面间的摩擦力作用,在地震作用下可能会发生滑动。通过建立单墩计算模型,对板式橡胶支座滑动的动力性能进行分析。为了克服由于板式橡胶支座滑动引起的梁体移位震害的不足,以一连续梁桥为研究背景,利用Midas软件进行了非线性时程反应分析,探讨目前板式橡胶支座桥梁所存在的问题,提出将梁桥中对称桥墩处改置一铅芯橡胶支座的地震位移控制方法。结果表明:该方法能够有效地控制支座以及其上梁体的地震位移,减少落梁震害的发生。
Support is an important component of bridge. The rubber support is usually placed on the top of the pier directly and the shear force is transmitted to it from the superstructure due to the friction. In the earthquake condition, sliding may occur in the interface between the support and the pier. The model of a single pier and a laminated rubber support is established and the dynamic characteristic of the laminated rubber support in the sliding is analyzed. Taking a continuousbeam bridge as the object, the Midas code is used to conduct the seismic response analysis of the bridge structure based on nonlinear time- history method. The possible defects of the laminated rubber support are discussed. A new method for controlling girder's seismic displacement is proposed, in which the laminated rubber supports on symmetrical piers in the continuous- beam bridge are replaced by lead- rubber supports. The results show that the new method is effective in controlling the support and girder's seismic displacement and avoiding the girder's falling disaster.
Support is an important component of bridge. The rubber support is usually placed on the top of the pier directly and the shear force is transmitted to it from the superstructure due to the friction. In the earthquake condition, sliding may occur in the interface between the support and the pier. The model of a single pier and a laminated rubber support is established and the dynamic characteristic of the laminated rubber support in the sliding is analyzed. Taking a continuousbeam bridge as the object, the Midas code is used to conduct the seismic response analysis of the bridge structure based on nonlinear time- history method. The possible defects of the laminated rubber support are discussed. A new method for controlling girder's seismic displacement is proposed, in which the laminated rubber supports on symmetrical piers in the continuous- beam bridge are replaced by lead- rubber supports. The results show that the new method is effective in controlling the support and girder's seismic displacement and avoiding the girder's falling disaster.
引文
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[2]Ye Kun,Li Li,Zhu Hongping.A modified Kelvin impact model for pounding simulation of base-isolated building with adjacent structures[J].Earthquake Engineering and Engineering Vibrationibration,2009,8(3):433-446.
[3]贡金鑫,张勤,王雪婷.从汶川地震桥梁震害看现行国内外桥梁的抗震设计方法(一)[J].公路交通科技,2010,27(9):45-46.
[4]杜修力,韩强,李忠献,等.5.12汶川地震中山区公路桥梁震害及启示[J].北京工业大学学报,2008,34(12):44-53.
[5]范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路公路,2009(5):122-128.
[6]刘健新,赵国辉.5.12汶川地震典型桥梁震害分析[J].建筑科学与工程学报,2009,26(2):92-97.
[7]涂建维,任伟,吴平.叠层型磁流变弹性体智能隔震支座及其磁场有限元分析[J].噪声与振动控制,2010,(5):169-172.
[8]汤虎,李建中.连续梁桥固定墩减震设计方法研究[J].土木工程学报,2011,44(12):64-72.
[9]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.
[10]宋一凡.公路桥梁动力学[M].北京:人民交通出版社,2000.
[11]叶爱君.桥梁抗震[M].北京:人民交通出版社,2002.4.
[12]张宇旭.多向地震作用下地下结构响应分析[J].噪声与振动控制,2012,(2):99-101.
[13]Hwang J S Chiou J M.An equivalent linear model of lead rubber seismic isolation bearings.engineering structures[M].1996,18(7):525-566.
[14]范立础,袁万城.桥梁橡胶支座减、隔震性能研究[J].同济大学学报,1989,17(4):447-455.
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