活动支座摩擦作用对连续梁桥固定支座剪力的影响
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摘要
目前认为活动支座摩擦作用对连续梁固定支座剪力起有利的降低作用,抗震分析时一般忽略活动支座摩擦作用的影响。为了研究连续梁桥活动支座摩擦作用对固定支座剪力地震反应的影响,建立了考虑活动支座摩擦作用的连续梁桥抗震分析有限元模型,计算了各种情况下的固定支座剪力。研究发现,活动支座摩擦作用并不是在任何情况下都是有利的,根据分析结果给出了需要考虑活动支座摩擦力的情况,提出固定支座剪力简化计算公式需要综合考虑结构的自振特性及场地反应谱的影响。
At present the friction action at movable support is generally considered favorable to the shear force at the fixed support of continuous beam bridge,and the friction action is neglected at most cases of seismic analysis.The seismic finite element model with friction element was established to study the effect of the friction action at movable support on the seismic response of the shear force at fixed support,and the shear forces of the fixed support under different conditions were calculated.The results indicate that the friction action of movable support is not favorable in any event,the cases that the friction action at the movable supports must be taken into account is put forward according to the results.The simplified formula for the shear force at fixed support should consider the effect of natural frequency of the bridge structure and ground spectrum.
At present the friction action at movable support is generally considered favorable to the shear force at the fixed support of continuous beam bridge,and the friction action is neglected at most cases of seismic analysis.The seismic finite element model with friction element was established to study the effect of the friction action at movable support on the seismic response of the shear force at fixed support,and the shear forces of the fixed support under different conditions were calculated.The results indicate that the friction action of movable support is not favorable in any event,the cases that the friction action at the movable supports must be taken into account is put forward according to the results.The simplified formula for the shear force at fixed support should consider the effect of natural frequency of the bridge structure and ground spectrum.
引文
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[9]Gael Bondonet,Andre Filiatrault.Frictional response of PTFE sliding bearings at high frequencies[J].Journal of Bridge Engineering,1997,2(4):139-148.
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[2]王常峰,陈兴冲,朱东生.活动支座摩擦力对桥梁抗震性能的影响参数分析[J].世界地震工程,2005,21(4):82-87.WANG Changfeng,CHEN Xingchong,ZHU Dongsheng.Analysis on the influence of the friction force at the movable supports on the seismic per-formance of a bridge[J].World Earthquake Engineering,2005,21(4):82-87.
[3]王东升,冯启民.活动支座摩擦力对简支梁桥地震反应的影响[J].地震工程与工程振动,1998,18(4):30-39.WANG Dongsheng,Feng Qimin.Effects of frictional force at movable supports on earthquake response of simply supported reinforced concretebridges[J].Earthquake Engineering and Engineering Vibration,1998,18(4):30-39.
[4]叶爱君,胡世德,范立础.桥梁支座抗震性能的模拟分析[J].同济大学学报,2001,29(1):6-9.YE Aijun,HU Shide,FAN Lichu.Simulation of seismic behavior for bridge bearings[J].Journal of Tongji University,2001,29(1):6-9.
[5]聂丽英,李建中,范立础.滑动支座竖向动反力对桥梁结构动力性能的影响[J].同济大学学报,2002,30(1):128-132.NIE Liying,LI Jianzhong,FAN Lichu.Effects of dynamic vertical resistance force of sliding bearing of bridges[J].Journal of Tongji University,2002,30(1):128-132.
[6]Sevket Atesa,Alemdar Bayraktar,Aydin Dumanoglu A.The effect of spatially varying earthquake ground motionson the stochastic response of bridg-es isolated with friction pendulum systems[J].Soil Dynamics and Earthquake Engineering.2006(26):31-44.
[7]范立础,聂丽英,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.FAN Lichu,NIE Liying,LI Jianzhong.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journal ofHighway and Transport,2003,16(4):30-35.
[8]Bhaskararao A V,Jangid R S.Seismic analysis of structures connected with friction dampers[J].Engineering Structures.2006(28):690-703.
[9]Gael Bondonet,Andre Filiatrault.Frictional response of PTFE sliding bearings at high frequencies[J].Journal of Bridge Engineering,1997,2(4):139-148.
[10]周光伟,李建中,范立础.多跨连续梁桥纵桥向动力特性研究及其地震反应谱简化分析[J].交通与计算机,2008,26(5):1-5.ZHOU Guangwei,LI Jianzhong,FAN Lichu.Dynamic characteristic of multispan continuous rridges in span direction and Its seismic analysis of re-sponse spectrum[J].Computer and Communications,2008,26(5):1-5.
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