Abstract

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Title:: Integral Transformation Design of Multi-span Hollow Slab Simply-supported Bridge

Author(s):: DONG Ju-can; CHEN Bao-chun; BRISEGHELLA Bruno; ZHUANG Yi-zhou; School of Civil Engineering, Fuzhou University

Keywords:: hollow slab; simply-supported bridge; integral transformation; deck of extension bridge

Abstract:: Taking a multi-span hollow slab simply-supported bridge as example, a new kind of integral transformation scheme by canceling the whole bridge expansion joints and bearings was proposed based on the disease investigation, technical condition evaluation. The integral transformation design of the bridge included removing the superstructure of the bridge, and the new superstructure system still used precast hollow slab, whose structural system was from the simply-supported structure to the continuous one. Then the connection structure between the beam end and the approach slab was transformed by canceling the expansion joint of the bridge pier and abutment. The superstructure and substructure were connected by the steel bar after canceling the whole bridge bearing. Finally, comparison and analysis of the mechanical behaviors before and after integral transformation of the bridge were carried out. The results show that the kind of active reinforcement method by the system transformation can improve the bearing capacity and the mechanical performance of the structure. The transformation of integral bridge can effectively improve the usability, avoid the maintenance and repairing of bridge expansion joints and bearings, and improve the ability of sustainable development of the bridge.