MECHANICAL BEHAVIOR OF STEEL-STC COMPOSITE DECK SYSTEM FOR A DOUBLE-PYLON SINGLE-CABLE-PLANE CABLE-STAYED BRIDGE WITH LARGE TRANSVERSE CANTILEVER GIRDER

Author(s): Banfu Yan, Panjie Yang, Yinan Jia and Wei Li
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 754-762
Total Pages: 9
Language : English

Abstract: 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.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00