车-桥碰撞动力及防护装置设计分析

Dynamic Analysis of Vehicle-bridge Collision and Design of Protective Devices

为研究超高车辆撞击下桥梁结构的动态响应,以一座预应力混凝土空心板桥为研究对象,采用非线性有限元仿真技术,模拟了车-桥碰撞过程,对超高车辆撞击下被撞梁的动态响应及损伤进行了分析。考虑到目前既有桥梁上部结构防护装置的种类匮乏,提出了一种基于ECC(超高韧性水泥基复合材料)板的组合防护装置,对防护装置的防护性能进行了分析,探讨了不同设计参数下,防护装置性能的变化特征,为工程设计人员提供参考。

In order to study the dynamic response of bridge structures under the impact of ultra-high vehicles,taking a prestressed concrete hollow slab bridge as the research object,the dynamic response and damage of the impacted beam under the impact of ultra-high vehicles are analyzed by using the nonlinear finite element simulation technology to simulate the vehicle-bridge collision process.Considering the current scarcity of types of protective devices for the upper structure of the existing bridge,a kind of composite protective device based on ECC(Engineered Cementitious Composites)plate is put forward.The protective performance of the protective device is analyzed,and the characteristics of changes in the performance of the protective device under different design parameters are discussed,so as to provide reference for the engineering designers.