大跨度斜拉桥刚度对结构动力特性的影响研究

Study on the Influence of Stiffness of Long-Span Cable-Stayed Bridges on the Dynamic Characteristics of Structures

为确定大跨度斜拉桥刚度对结构动力特性的影响,以泸州市长江六桥为工程背景,基于VBWD(Vehicle-Bridge-Wind Dynamics)程序,开展不同的主梁刚度、拉索刚度、主梁-拉索刚度以及桥塔刚度对结构动力特性的影响研究。结果表明:大跨度斜拉桥的竖向刚度主要由主梁竖向刚度和拉索刚度提供,其中,拉索刚度所占比重较大;横向刚度主要由桥塔横弯刚度和主梁横弯刚度提供,其中,主梁横弯刚度所占比重较大。

In order to determine the influence of long-span cable-stayed bridge stiffness on the dynamic characteristics of the structure,taking Luzhou Changjiang River sixth Bridge as the engineering background,based on VBWD(Vehicle-Bridge-Wind Dynamics)program,different main girder stiffness and cable stiffness are carried out.The influence of girder-cable stiffness and tower stiffness on the dynamic characteristics of the structure is studied.The results show that the vertical stiffness of the long-span cable-stayed bridge is mainly provided by the vertical stiffness of the main beam and the stiffness of the cable,in which the proportion of the stiffness of the cable is large.The transverse stiffness is mainly provided by the lateral bending stiffness of the tower and the transverse bending stiffness of the main beam,in which the transverse bending stiffness of the main beam accounts for a large proportion.