车辆动荷载对水闸交通桥结构安全的影响

为了研究水闸与市政道路联合布置时,闸上交通桥车辆动荷载对水闸结构安全和交通安全的影响,以上海市奉贤区南门港水闸为研究对象,建立三维有限元模型,采用线性时程分析法计算了车辆动荷载下交通桥的应力分布。经计算分析,车辆动荷载产生的应力主要由交通桥主梁承担,对水闸主体结构应力影响不大,闸路结合的方案总体是合理的;在不同的车辆参数(标准车辆和吊车,车速分别为60 km/h、80 km/h、100 km/h)和不同车流量下,交通桥主梁跨中应力峰值均不相同,因此为提高水闸运行的安全性,应对过闸车辆限速限载。

Influence of Vehicle Dynamic Load on Structural Safety of Sluice Traffic Bridge

In order to study the influence of dynamic load of vehicles on sluice traffic bridge on the sluice structural safety and traffic safety when a sluice is arranged together with a municipal road,taking the Nanmen Port Sluice as the study object,a three-dimensional finite element model is established.The linear time history analysis method is used to calculate the stress distribution of the traffic bridge under the vehicle dynamic load.The calculation and analysis show that the stress generated by the dynamic load of vehicle is mainly borne by the main beam of the traffic bridge.It has little effect on the main structure stress of the sluice.The scheme of combining the sluice and road is reasonable on the whole.Under the different vehicle parameters(standard vehicle 60 km/h,80 km/h,100 km/h,and crane 60 km/h,80 km/h,100 km/h)and the different traffic flows,the stress peaks in the main beam span of traffic bridge are all different.Therefore,in order to improve the safety of the sluice operation,the speed of passing-sluice vehicle should be limited.