预应力混凝土空心板桥梁的结构可靠性评估

Structural Reliability Evaluation of Prestressed Concrete Hollow Slab Bridge

通过对某预应力混凝土空心板桥梁进行现状调查、混凝土强度、碳化试验及静动力性能试验,建立有限元空间模型对桥梁进行了仿真分析及可靠性评估。结果表明,此桥梁桥墩碳化深度较大,空心板前5阶振型以弯曲振型为主,冲击系数接近规定值;基于动测参数刚度评价与静力试验刚度评价具有同等的可靠性;该桥技术状况评定等级为四类,需尽快进行大修或改造。

In order to conduct the reliability assessment of a certain bridge,the status quo of a prestressed concrete hollow slab and a spatial finite element model were carried out and developed for numerical simulation,and the concrete strength test,carbonization test,relevant static and dynamic mechanical test were also conducted for providing relative data.The results show that the depth of carbonation of the bridge pier is comparatively great,the main mode of the first five vibration modes of the concrete hollow slab is bending mode and the impact coefficient is closed to the regulated value.The stiffness evaluation based on the parameters obtained by dynamic test has the same reliability as that based on the parameters obtained by static test.It is revealed that the technical condition of this bridge is ranked as 4th,which indicates that further overhaul or reconstruction are required.