某双曲拱桥的动静力测试及承载能力评估  

The Dynamic and Static Test and Capacity Evaluation on a Double Arch Bridge

作　　者：杨勇[1] 刘能文[1] 金晶[1] 李儒[2] 

机构地区：[1]北京市市政工程设计研究总院,100082 [2]沈阳市城建局建设处,110016

出　　处：《特种结构》2012年第5期75-80,共6页Special Structures

摘　　要：本文以某双曲拱桥的承载力评估为例,在总结几种有限元模型离散方法的基础上,结合双曲拱桥的结构形式,提出采用梁板结合的模拟方法,用大型通用有限元软件ANSYS进行了双曲拱桥的模型建立。同时,阐述了双曲拱桥的动载及静载试验的试验方法与过程,包括用等代荷载的方法确定荷载车辆、各种工况的分级加载、动载及静栽试验测点的布置。依据有限元分析结果与动静力荷栽结果的对比分析,对工程实例桥的承载能力进行了评估分析,得出了该桥当前的结构性能和状况。结果表明,正确的计算模型是评定双曲拱桥承载能力的关键,有限元法中的板梁法结合双曲拱桥的结构形式,是双曲拱桥结构空间分析的一种有效方法,以有限元理论分析和动静力荷载试验相结合的方法能较为全面地评定双曲拱桥的承载能力,可为同类桥梁计算分析及承载能力评定提供参考。Taking a double arch bridge as the evaluation example, based on the summarization of several finite element discrete methods, in combination with the structure type of double arch bridge, the simulation method combining beam-plate was pointed out in this paper, and finite element model for double arch bridges was established by using large general finite element software ANSYS. At the same time, dynamic load and the static load test method for double arch bridges were elaborated, including using equivalent load method to determine load vehicle, step loading under different conditions, the layout of measuring points in dynamic and static test. According to the comparative analysis between finite element analysis results and dynamic and static test results, the structure performance and the current situation can be obtained. The results show that the correct calculation model is the key of the bearing capacity evaluation for double arch bridges. And the combination of the finite element method of beam-plate method and structure form of double arch bridges is an effective method for space structure analysis of double arch bridges. Using the combination of finite element theory analysis and dynamic and static load test method can comprehensively evaluate the bearing capacity of double arch bridges, which can provide the reference for the calculation analysis and bearing capacity evaluation for the same kind of bridges.

关 键 词：有限元 双曲拱桥 梁板法 静力测试 

分 类 号：U446[建筑科学—桥梁与隧道工程]