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为分析浮桥上移动荷载的重量与移动速度对浮桥动力响应的影响,应用有限元方法将控制方程进行离散,得到系统的运动方程,通过编写相应的计算程序求解了浮桥的位移响应,并利用有限元软件对已求解出的位移响应进行后处理,分别得到了不带铰浮桥和带铰浮桥在不同荷载重量、不同荷载移动速度下的内力响应曲线。数值模拟结果表明:随着荷载重量和荷载移动速度的增加,浮桥的位移和应力也随之增加;当移动荷载的重量和移动速度相同时,带铰浮桥的应力比不带铰浮桥大得多,当230kN的荷载分别以1m/s、5m/s、10m/s、20m/s的速度移动到浮桥中点时,带铰浮桥的最大应力比不带铰浮桥分别大114%、117%、108%、111%。因此,将浮桥简化为连续梁用平均刚度法求解出位移响应后,不能直接求解应力,应当考虑铰对浮桥动力响应的影响,否则求解出的应力偏小,不利于浮桥安全系数的计算。
In order to analyze the influence of the weight and moving speed of moving load on the dynamic response of floating bridge, the governing equations are discretized using finite element method, and the equations of motion of the system are obtained. The displacement response of the floating bridge is solved by writing corresponding calculation program. The meta-software post-process the displacement response which has been solved, and obtain the internal force response curves of the pontoon with hinged and hinged pontoons at different load weights and different load moving speeds respectively. Numerical simulation results show that with the increase of load weight and load moving speed, the displacement and stress of the pontoon bridge also increase. When the weight and moving speed of the moving load are the same, the stress of the pontoon with pontoon is much larger than that without the pontoon bridge When the load of 230kN moves to the midpoint of the pontoon at 1m / s, 5m / s, 10m / s and 20m / s respectively, the maximum stress of the pontoon with the hinged pontoon is 114% 108%, 111%. Therefore, when the floating bridge is simplified as a continuous beam and the average stiffness of the continuous beam is used to solve the displacement response, the stress can not be solved directly. The influence of the hinge on the dynamic response of the floating bridge should be considered. Otherwise, the calculated stress is too small, which is not conducive to the calculation of the safety factor of the floating bridge.