HIGHWAY BRIDGE WIDENING: STRUCTURAL CONSIDERATIONS AND RESEARCH NEEDS
Due to increasing traffic volumes in parallel with the ever mounting urban development, the widening of highway bridges has become quite common in China and many parts of the world. It is essential that design and construction engineers should have a thorough understanding of the important issues peculiar to bridge widening, such as interfacing with the existing bridge elements, imposition of traffic control, and the potential construction difficulties. A common practice of widening bridges is to construct a new bridge deck by the side of the existing bridge deck and cast an in situ concrete stitch (also called stitching slab) between the existing and the new decks to provide a monolithic connection and a continuous riding surface. In this paper, engineering issues concerning bridge widening are addressed and the relevant research development is reviewed. In regard to the laboratory testing of concrete stitches in bridge widening, a recently-developed test method is highlighted. The method simulates the contraflexural loading condition of a concrete stitch and takes into account the changes in deflection and loading as the stiffness of the curing concrete stitch increases with time. This paper also introduces practicable ways to mitigate traffic-induced vibrations and deflections, and points out areas that need to be further investigated.
Bridge widening Concrete stitch Traffic-induced vibrations.
Jin Sheng DU Pui Lam NG Francis Tat Kwong AU
School of Civil Engineering, Beijing Jiao Tong University, Beijing, 100044, China Department of Civil Engineering, The University of Hong Kong, Hong Kong, China
国际会议
北京
英文
436-441
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）