Urban railways are generally built around cities or along the arterial roads, where residential areas, schools, hospitals and other environmental sensitive points are densely distributed, and there are stringent requirements on environmental protection, landscape, clearance under the bridge and rapid green construction and often complex bridge construction conditions. The steel-concrete composite structure bridge, giving full play to the respective material advantages of steel and concrete, is well suited to the construction and operation environment of urban railways in terms of static and dynamic performance of the structure, landscape, environmental protection, rapid construction and green prefabricated construction, with a wide range of application prospects and strong competitive advantages.
Under this research, the applications of the steel-concrete composite girder in urban railways at home and abroad were summarized, the reasonable technical parameters, design theory, construction method and technical and economic analysis were studied, and the reasonable span, design parameters, section form and construction scheme were put forward. Five innovative technologies have been developed, including the key technology in the complete design of steel-concrete composite girder for urban railways, the comprehensive anti-crack and lifting technology in hogging moment area, and three new structures of transverse full-width precast concrete bridge deck with cantilever, which can provide technical support for the design and construction of steel-concrete composite girder for urban railways, popularize application of steel-concrete composite structure bridge in urban railway bridges, save the construction cost of urban railway bridges, reduce the adverse impact on urban traffic, landscape and environment, and bring about good social and economic effects.
The outcomes of the research project comprise three patents granted, three papers (including one SCI paper) published, and two sets of conceptual design drawings of common span simply-supported and continuous steel-concrete composite girders. The research results have been applied in the engineering design of Shanghai Airport Link, Taizhou Rail Transit and Wenzhou Rail Transit Line S3.
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