基于动静载试验的斜拉桥初始状态研究

Research on Initial State of Cable-stayed Bridge Based on Dynamic and Static Load Test

摘要:

由于施工阶段中存在较多的不确定性，桥梁的初始成桥状态与设计成桥状态存在误差。精确掌握桥梁初始成桥状态，对于后续运维养护具有重要意义。桥梁动静载试验是测试桥梁性能的重要方法之一。以某主跨220 m独塔斜拉桥为例，结合动静载试验的方法，测定了该桥的自振特性、在特定荷载下的动静挠度和应变等参数，并与有限元模型理论值进行比较。结果表明，该桥结构刚度、动力特性均满足设计要求，具有较好的初始成桥状态。

Abstract:

Due to many uncertainties in the construction stage, there is an error between the initial state and the design state of the finished bridges. It is of great significance to accurately grasp the initial state of the finished bridge for the subsequent operation and maintenance. The dynamic and static load test of bridge is one of the important methods to test the bridge performances. Taking a single-pylon cable-stayed bridge with a main span of 220 m as an example, combined with the method of dynamic and static load tests, the natural vibration characteristics of the bridge, the dynamic and static deflection, strain and other parameters under the specific loads are measured and compared with the theoretical values of the finite element model. The results show that the structural stiffness and dynamic characteristics of the bridge meet the design requirements with the good initial state of finished bridge.