带式浮桥在不同移动荷载作用下的动力响应分析  

Dynamic responses of ribbon bridge subjected to different moving loads

作　　者：王丙[1] 陈徐均[1] 江召兵[1,2] 黄亚新[1] 高福银[1,3] 

机构地区：[1]解放军理工大学野战工程学院,南京210007 [2]上海交通大学船舶海洋与建筑工程学院,上海200240 [3]南昌陆军学院,南昌330103

出　　处：《应用力学学报》2013年第1期43-48,144-145,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51009147);江苏省自然科学基金(BK2011121)

摘　　要：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。To analyze the influences of weight and moving velocity of moving load to the dynamic response of the floating bridge,finite element method is used to discretize the governing equations to get the system's motion equations,the displacement responses of the floating bridge are calculated by using of the self-developed programs,and the internal force response curves of floating bridge without joints and with joints under different weights and moving velocities of load are obtained by using the finite element software to post-process the solved displacement responses.The results of numerical simulation show that the displacement and the stress of floating bridge increase with the weights and the velocities of moving load.The stress of floating bridge with joints is much greater than the one of floating bridge without joints when the weight and moving velocity of moving load are the same.The maximum stress of floating bridge with joints is 114%,117%,108%,111% greater than the one of floating bridge without joints when the moving load of 230kN reach the midpoint of floating bridge in the velocity of 1m/s,5m/s,10m/s,20m/s.After solving the displacement of the floating bridge simplified as a continuous beam by using the average stiffness method,it is not good for the safety factor calculation by solving the stress directly instead of considering the influences of joints on the dynamic response of floating bridge,for the solved stress is too small.

关 键 词：浮桥 有限元 移动荷载 动力响应 

分 类 号：O353[理学—流体力学]