桥梁设计外文翻译曼哈顿大桥的研究与分析.doc

Proceedings of Bridge Engineering 2 Conference 2007 27 April 2007, University of Bath, Bath CRITICAL ANALYSIS OF THE MANHATTAN Julian Staden Departement of Civil and Architectural Engineering, University Abstract: This paper provides detailed information about the different aspects of the design of the Manhattan Suspension Bridge. Analytical reasoning is given to why each design feature was designed in the manor it was in order to fulfil the engineers’ design criteria. An attempt is also made to illustrate any short coming in the design of the structure and any ways in which the engineers could have potentially improved the design of the bridge. Attention will also be paid to the ways in which the bridge would be designed and constructed if it were to Keywords: truss, stiffness, tension, deck, torsion Figure 1: Manhattan Bridge. View from 1 Overview of The Manhattan The Manhattan Bridge, although unfinished, was opened in 1909 and was the third bridge to span the East River running between Brooklyn and Manhattan. It was built to provide another transport link between the two boroughs. Before construction began there was a great deal of controversy over the proposed designs for the bridge. Eventually a fairly typical looking suspension bridge design was approved that was designed by engineer Leon Moisieff. The bridge was to span 448metres between piers, which was a somewhat shorter distance than the main spans of either the Brooklyn or Williamsburg bridges that neighbore it..Even though the Manhattan Bridge made no advancement in the spanned length achievable by a suspension bridge, it did represent a significant step forward in the progression of bridge building. The bridge was the first to be designed using deflection theory, which quickly replaced all previous methods of bridge design. The design also incorporated steel towers that were only braced in two dimensions rather than three. This was another aspect of bridge design that had not been seen prior to the