About the author:

1. China Railway Wuhan Bureau Group Co., Ltd.,Wuhan, Hubei 430071, China;2. China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd.,Wuhan, Hubei 430074, China

Abstract:

In order to study the influence of multi-point support rotation legs layout of double-cable-stayedbridges with large spans on the stress state and rotational stability of the rotation system, based on thebridge crossing Xiangbei Marshalling Station as part of Xiangyang Inner Ring Road speed improvementand renovation project, a 1 ∶10 rotation model test was carried out. In the rotation model test, real-timetests were carried out on parameters such as the hinge stress of the spherical hinge, the traction force ofthe rotary body and the angle of the bridge by changing the arrangement form of the load-bearing legs inthe test model, and the influence of the arrangement of the load-bearing legs on the above parameters wasanalyzed. The test results show that with the increase of load-bearing legs, the stress state and stressamplitude of spherical hinge and load-bearing legs are greatly improved, and the stability of rotary body isgreatly improved. When the number of load-bearing legs increases from 4 to 6, the stress amplitude of thespherical hinge decreases from 29.6% to 4.6%, the stress amplitude of the legs decreases from 27.5% to15.9%, the traction force amplitude decreases from 21.0% to 10.6%, and the maximum inclinationangle of the bridge decreases from 0.11° to 0.03°.