桁架悬索桥全桥气弹模型设计方法研究  

A Study on Design Method of Full Bridge Aeroelastic Model of Suspension Bridge with Truss

作　　者：胡峰强[1] 陈艾荣[2] 

机构地区：[1]南昌大学建筑工程学院,南昌市330029 [2]同济大学桥梁工程系,上海市200092

出　　处：《公路》2009年第4期124-129,共6页Highway

摘　　要：针对大跨径桁架悬索桥全桥气弹模型风洞试验中,加劲梁外形复杂模拟难度大这一问题,提出了一种新的模型设计方法。首先,通过多种建模方法建立有限元模型,进行动力特性比较。采用单脊梁骨架模型方法模拟桁架加劲梁刚度,合理简化桁架加劲梁外形,近似模拟桁架气动力。分析桥塔、主缆、吊杆等模型设计中的各种影响因素。最后对模型进行动力特性试验验证,试验结果与理论分析接近一致。The complicated configuration of the truss stiffened girder is difficult to imitate in the wind tunnel tests of full-scale aeroelastic model of suspension bridge with the truss stiffened girder. A new model design method is put forward. The dynamic characteristics of the finite element method models built by various modeling method are compared. The design method which replaces the truss stiffened girder with a single beam through equivalent rigidity and simplifies the appearance of the truss stiffened girder properly is used. Then various influencing factors in the design of model such as a bridge tower, main cable and the hanger rod are analyzed. The dynamic behavior test is carried out, and the testing result and theoretical analysis coincides nearly.

关 键 词：大跨径桥梁 风洞试验 动力特性 全桥气弹模型 模态测试 

分 类 号：U488.25[交通运输工程—载运工具运用工程]