原文_secret.doc

China-Japan Joint Seminar on Steel and Composite Bridges Design of Steel Plate-Truss Composite Girder of Cable Stayed Minpu Bridge II J. Peng, W.L. Deng, L. Zhou, Y.C. Lu, M. Zhu Shanghai Urban Construction Design Research Institute, Shanghai 200011, China Abstract : Minpu Bridge II is a super large bridge with the integrated double decks for highway and railway traffic. The main part is cable-stayed through a single pylon and double cable sectors, with the span largest in China. Described hereby is how to select the main girder of the main span cable-stayed bridge from multiple options. The steel plate-truss composite girder is finally adopted, which is structurally reliable, with appropriate functions and simple construction. Key words : highway-railway double-deck bridge; cable-stayed bridge; steel plate-truss composite girder; bridge design 1 .DESCRIPTION OF WORKS Across the Huangpu River in Shanghai at the upper stream of Minhang and Fengxian, and 1.7km from Fengpu Bridge down, Minpu Bridge II is a super large bridge with integrated double decks for highway and railway traffic. The main part is formed by a double-deck cable-stayed bridge with a single pylon and double cable sectors, and the main span is 251m wide. The upper deck is 18m in width, used for a two-way four lane highway (Class II); the lower deck is for two light rails, i.e. Shanghai Rail Transit Line 5 in Min-Feng Section, with the minimum functional width of 10m. Figure 1 The layer of the main bridge 2 .COMPARISON OF OPTIONS FOR MAIN GIRDER With only a few exceptions, the large span double-deck bridges built usually use the steel truss girder for the main girder, which is no doubt more appropriate in terms of structural performance and construction applicability. The effect of the trussed girder is different, subject to the arrangement of members, so it is critical to select an optimal design adaptable to the type of bridge. In the design of the main trussed girder on the main span of Minpu Br