考虑滑移效应的钢-混组合梁桥车桥振动分析

Vehicle-bridge Vibration Analysis of Steel-concrete Composite Bridge Considering Slip Effect

采用考虑滑移效应的10自由度平面组合梁单元对钢-混组合梁桥进行模拟,结合10自由度列车模型及轮轨切线线性近似模型建立了列车-轨道-组合梁桥系统分析模型,并引入了表征组合简支梁连接程度的滑移刚度系数.采用MATLAB软件编写相应程序对系统方程组进行求解,用数值算例验证了编制程序的正确性,通过一算例计算分析了不同车速、滑移刚度对组合简支梁桥竖向振动响应的影响.结果表明,实际工程中应尽量保证滑移刚度系数大于10以减小车载作用下滑移效应对组合简支梁桥的不利影响.

The steel-concrete composite bridge was simulated by the 10-degree-of-freedom planar composite beam element considering the slip effect.By combining the 10-degree-of freedom train model and the wheel-rail tangent linear approximate model,the analysis model of train-rail-composite bridge system was established,and the slip stiffness factor which characterizes the connection degree of the simply supported composite bridge was introduced.The MATLAB was used to write a corrresponding program to solve the system equations,and a numerical example was used to verify the correctness of the program.Through a numerical example,the influence of different vehicle speeds and slip stiffness on the vertical vibration response of the simply supported composite bridge was analyzed.The results show that the slip stiffness coefficient should be greater than 10 to reduce the adverse impacts of slip effect on the simply supported composite bridge under vehicle load.