钢拱桥H形吊杆减振用抗风索优化设计

Optimization Design of Wind-resistant Cables for vibration Control of H-Section Hangers in Steel Arch Bridge

以佛山东平大桥H形吊杆风致振动控制为工程背景,采用有限元数值方法分析了抗风索道数、安装位置、初张力、边界条件和根数等参数对抗风索—H形吊杆组成的索杆结构系统弱轴弯曲和扭转基频的影响及其变化规律,并据此建立了以抗风索根数为关键参数的吊杆抗风索减振优化设计方法。研究表明,抗风索根数对索杆结构系统弱轴弯曲和扭转基频的影响最大,抗风索道数、安装位置、边界条件和初张力的影响作用依次递减;建立的H形吊杆抗风索减振措施参数优化设计流程与方法简单有效、切实可行。

On the basis of wind-induced vibration control of H-Section hangers in Dongping Bridge in Foshan city,the influencing factors,such as position numbers,installation position,initial tension,boundary conditions as well as the number of wind-resistant cables and variation of weak-axis flexural and torsional fundamental frequencies of the combined cable-hanger system are analyzed by finite element method.On this basis,the optimization design flowchart of wind-resistant cables for vibration control of H-Section hangers is established,in which the number of wind-resistant cables is chosen as the key parameter.The results show that the number of wind-resistant cables has the greatest effects on weak-axis flexural and torsional fundamental frequencies of the combined cable-hanger system,while the effect of the position numbers,installation position,boundary conditions and initial tension of wind-resistant cables gradually decrease.In addition,the proposed optimization design flowchart of wind-resistant cables for vibration control of H-Section hangers is really simple,effective and feasible.