LRB隔震桥梁遭受超高车辆撞击时的响应分析
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摘要
采用线性弹簧碰撞单元,用ANSYS有限元软件建立了超高车辆-桥梁的碰撞模型,对LRB隔震桥梁受到超高车辆正向撞击时的整体响应进行了非线性时程分析。结果表明,车桥碰撞时能产生较大撞击力;铅芯橡胶支座在超高车辆撞击桥梁时能消耗撞击能量,可有效地减小碰撞力向桥墩传播,起到"隔震"作用;影响撞击响应的主要因素是碰撞刚度、超高车辆的质量和速度。最后,为了便于工程设计提出了超高车辆-桥梁碰撞力的计算公式。
Collisions between super high vehicles and city viaducts happen frequently.The responses of lead rubber bearings(LRB) isolated bridges impacted by over-height trucks are worth further research.Based on linear spring pounding elements,a finite element model with lead rubber bearings and over-height trucks were created.Nonlinear dynamic analysis was used to investigate the behavior of the vehicle-bridge collision.The results show that the lead rubber bearings have the effect of vibration isolation,which can dissipate pounding energy and reduce the impact force transmitted to piers,then protect the bridge from damaged.It also has been determined that the primary factors affecting the pounding response are impact stiffness,the mass and speed of vehicle.At last,formula for calculating the impact force of collisions between over-height trucks and bridges were proposed.
Collisions between super high vehicles and city viaducts happen frequently.The responses of lead rubber bearings(LRB) isolated bridges impacted by over-height trucks are worth further research.Based on linear spring pounding elements,a finite element model with lead rubber bearings and over-height trucks were created.Nonlinear dynamic analysis was used to investigate the behavior of the vehicle-bridge collision.The results show that the lead rubber bearings have the effect of vibration isolation,which can dissipate pounding energy and reduce the impact force transmitted to piers,then protect the bridge from damaged.It also has been determined that the primary factors affecting the pounding response are impact stiffness,the mass and speed of vehicle.At last,formula for calculating the impact force of collisions between over-height trucks and bridges were proposed.
引文
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[11]肖波,周楚兵,吴卫国,等.船与刚性桥墩的碰撞性能分析[J].武汉理工大学学报(交通科学与工程版),2005,(6):855-857.
[2]陆新征,张炎圣,宁静,等.超高车辆与立交桥梁碰撞的高精度非线性有限元仿真[J].石家庄铁道学院学报,2007,20(1):29-34.
[3]江宜城,杨德喜,李黎,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,26(1):104-120.
[4]聂利英,李建中,范立础.地震作用下结构碰撞的模型参数及其影响分析[J].工程力学,2005,22(5):142-146.
[5]Qiao Pizhong,Yang Mijia,Mosallam Ayman S.Impact Analysis of I-lam Sandwich System for Over-height Collision Protectionof Highway Bridges[J].Engineering Structures,2004,26(7):1003-1012.
[6]秦志英,陆启韶.基于恢复系数的碰撞过程模型分析[J].动力学与控制学报,2006,4(4):294-297.
[7]樊剑,刘铁.近断层地震下摩擦型隔震结构与限位装置碰撞反应及防护研究[J].土木工程学报,2007,40(5):10-16.
[8]Mishra B K.A Review of Computer Simulation of Tumbling Mills by the Discrete Element Method:Part I—Contact Mechan-ics[J].International Journal of Mineral Processing,2003,71:73-93.
[9]Hunt K H,Crossley F R E.Coefficient of Restitution Interpreted as Damping in Vibroimpact[J].Journal of Applied Mechan-ics,1975,42(3):440-445.
[10]王君杰,颜海泉,钱铧.基于碰撞仿真的桥梁船撞力规范公式的比较研究[J].公路交通科技,2006,23(2):68-73.
[11]肖波,周楚兵,吴卫国,等.船与刚性桥墩的碰撞性能分析[J].武汉理工大学学报(交通科学与工程版),2005,(6):855-857.
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