MECHANICAL BEHAVIOR OF STEEL-STC COMPOSITE DECK SYSTEM FOR A DOUBLE-PYLON SINGLE-CABLE-PLANE CABLE-STAYED BRIDGE WITH LARGE TRANSVERSE CANTILEVER GIRDER
The 4th Qingyuan Beijiang bridge is a steel-concrete hybrid cable-stayed bridge with double pylons, single cable plane, super-wide large cantilever girder, and steel-STC (super tough concrete) composite deck system.The super-wide large cantilever girder results in high level tensile stress of STC layer of the steel-STC deck system under transverse unbalanced eccentric load.The study proposed the preloading scheme for large transverse girder to increase its compression stress level, and the scale model test is employed to investigate the mechanical behavior of the STC layer of the transverse girder.Moreover, the local stiffness of the lightweight composite deck system is greatly enhanced due to the introduction of STC layer, which reduces the live-load stress amplitude and prolongs the fatigue life.The fatigue performance of STC layer and fatigue details of the steel box girder such as transverse diaphragm, u-type rib, and steel web are studied by means of fatigue stress analysis (hot-spot stress analysis), and the fatigue life of STC layer and steel box girder are evaluated.
Cable-stayed bridge Composite deck system Super tough concrete Transverse cantilever girder Fatigue analysis
Banfu Yan Panjie Yang Yinan Jia Wei Li
College of Civil Engineering, Hunan University, P.R.China
国际会议
福州
英文
730-738
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）