钢拱桥H型刚性吊杆风振疲劳性能研究  

A Study of the Wind-Induced Vibration Fatigue Performance of the H-Shaped Hanger in Arch Bridges

作　　者：石军伟 SHI Junwei(The Zhengzhou Engineering Co. Ltd. of the Seventh Bureau Group of China Railway, Zhengzhou 450052,China)

机构地区：[1]中铁七局集团郑州工程有限公司,河南郑州450052

出　　处：《国防交通工程与技术》2021年第3期5-8,76,共5页Traffic Engineering and Technology for National Defence

基　　金：中国中铁七局集团有限公司科研项目(17A07)。

摘　　要：H型刚性吊杆是钢拱桥常采用的一种吊杆形式,具有长细比大、抗扭刚度小、阻尼低等特征,易诱发大幅风致扭转振动,导致吊杆节点板连接疲劳损伤问题。以某钢拱桥40 m长H型刚性吊杆为研究对象,综合理论分析与有限元数值仿真分析开展吊杆风致扭转振动疲劳评估。研究表明:有限元仿真分析吊杆节点板的螺栓连接可采用面-面接触关系模拟,接触刚度是其关键参数;有限元仿真分析得到的吊杆翼缘板扭转翘曲应力值与理论计算值基本一致;吊杆中心截面扭转角幅值可作为吊杆疲劳损伤程度的有效评估指标,即控制吊杆扭转角限值即可保证吊杆安全,3.7°可作为该40 m长吊杆的扭转角振动控制目标。Owing to their characteristics of high slenderness ratio and small torsional stiffness as well as low damping ratio,H-shaped hangers are commonly adopted for steel arch bridges.However,they may result in strong torsional vibrations under even low wind speed,which can lead to fatigue problems at the flange of the hanger near the hanger-to-beam connection.Fully to assess the fatigue performance of the H-shaped hanger,both analytical investigation and finite element analysis are performed for a 40 m-long hanger in a certain actual bridge. The results of our research show that the bolt connection between the hanger and the gusset plate can be accurately simulated with the face-face contact in the finite element model, where the face-face contact stiffness is the critical parameter. The numerical torsional warping stress of the hanger via the finite element model is basically consistent with that predicted via the theoretical formulae. The torsional angle in the middle section of the hanger is a good performance index for evaluating the fatigue performance of the hanger, which means the hanger will be safe as long as its torsional angle is within a certain range. As for the 40 m-long hanger in this paper, the torsional angle of 3.7°can be used as the control target for the vibration mitigation.

关 键 词：拱桥 H型吊杆 风致扭转振动 有限元模型 疲劳评估 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]