作者机构:
[雷俊卿; 李忠三] School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;[颜东煌] School of Civil Engineering, Changsha University of Science and Technology, Changsha Hunan 410004, China
通讯机构:
[Li, Z.] S;School of Civil Engineering, Beijing Jiaotong University, China
关键词:
桥梁工程;混合梁斜拉桥;施工控制;设计参数;敏感性分析
摘要:
为了提高大跨度混合梁斜拉桥的施工控制精度,通过计算比较梁重、斜拉索张拉力、斜拉索的刚度等设计参数在成桥时对主梁挠度、主梁应力和索力的影响程度,分析了各设计参数的敏感性。计算结果表明,大跨度混合梁斜拉桥主要设计参数有梁重和拉索张拉力,而索的刚度对成桥状态影响不大。通过修正主要设计参数,同时忽略次要设计参数的影响,对荆岳长江公路大桥进行施工控制。成桥测试结果表明,拉索索力与成桥线形状况良好,均在误差控制允许的范围内,其中索力误差小于5%,主梁标高偏差小于65 mm.
摘要:
To reach the optimum mechanics state of long span cable-stayed bridge after it erected, a method is proposed to predict and adjust parameter in construct control of cable-stayed bridge, which integrates the grey prediction theory model and influence matrix adjustment method compositively. The selection of parameters of construct control, reasonable objects of adjustment and determination of state variable during prediction data process are also studied deeply, and a perfect procedure and method is established to identify, predict and optimizing adjust parameters. The method is also verified by construct control of the longest span pre-stressed concrete bridge in Asia, and the effect of construct is very successful. This work of construct control can absolutely demonstrate the validity and practicability of the method.
关键词:
Finite Element Analysis (FEA);Load Test;Pedestrian Suspension Bridge
摘要:
This study focuses on test loading program and evaluation for pedestrian bridge. On the basis of the finite element analysis, numerical model of Lv River Bridge, which is a steel box pedestrian suspension bridge, is established. Moreover, field static load test is done and the results of tests are compared to the theoretical values. Results show that the measured result fits well with the theoretical result and bridge is in the situation of elastic deformation, and the strength and stiffness satisfy the need of design.
摘要:
The stress state of finished bridge and service stage is influenced by various closure schemes in cantilever construction of multi-span prestressed concrete box-girder bridge. Two typical bridges multi-span prestressed concrete continuous rigid frame bridge and girder bridge are investigated, The stress state in different closure schemes are analyzed using finite element(FE) analysis. Meanwhile, compared the healthy monitoring data, it has been found that taking the closure sequence from side span to middle span in cantilever construction of multi-span prestressed concrete box-girder bridge can lower stress of girder and pier in finished bridge stage, as well as reducing deformation of girder in service stage. Hence, the closure sequence from side span to middle span is more suitable for cantilever construction of multi-span prestressed concrete box-girder bridge.