作　　者： ; (黄志斌）;

机构地区： 湖南大学土木工程学院

出　　处： 《铁道学报》 2010年第6期84-89,共6页

摘　　要： 基于Timoshenko梁理论,建立船舶撞击桥墩的动力学模型,并对横向瞬态响应进行研究。桥梁基础结构和上部结构对桥墩的弹性约束分别采用抗推弹簧和抗扭弹簧来模拟,考虑上部结构对桥墩轴向压力的影响,同时基于能量泛函变分原理导出桥墩的横向振动方程。采用Laplace正变换和Crump逆变换,求解动力控制微分方程,获得桥墩时域内各种瞬态动力响应。采用有限元法进行分析,并将结果与本文方法及我国铁路规范的结果进行比较。结果表明:在弹性工作范围内,本文方法与有限元法的结果吻合较好,但与规范值相差较大。研究不同撞击位置、边界条件和上部结构轴向压力对其动力响应的影响,得出一些有益的结论。 On the basis of the theory of Timshenko,the dynamic simulation model of pier-ship collision is built and the lateral transient responses are studied.Considering the influence of the superstructure on the axial pressure of the pier,flexible constraints of the superstructure and substructure on piers are simulated by compression springs and rotational springs respectively.The lateral transient vibration equation of piers is deduced on the basis of the potential energy variation functional principle.Then,the differential equation is solved by applying Laplace transformation and Crump inverse transformation.In this way,sorts of dynamic responses of piers in the time domain are obtained.The method proposed in this paper is compared with the finite element method and current railway code,which shows that the result of the proposed method is in good agreement with that of the finite element method in the elastic stage but is of great difference with the calculation of the current railway code.Finally,the effects of different impact positions,boundary conditions and axial pressure of the superstructure on dynamics responses are studied and a number of useful conclusions are gained.

关 键 词： 桥墩 撞击 力学模型 动力响应

领　　域： [建筑科学] [交通运输工程]