Study on Pre&mdash;camber of Large Span Railway Steel&mdash;truss Girder Cable&mdash;stayed Bridge

ZENG Yong—ping; CHEN Tian—di; YUAN Ming; DAI Shen—yong

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Journal of Railway Engineering Society ›› 2010, Vol. 27 ›› Issue (10) : 78-81.

Study on Pre—camber of Large Span Railway Steel—truss Girder Cable—stayed Bridge

ZENG Yong—ping，CHEN Tian—di，YUAN Ming，DAI Shen—yong

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Abstract

Research purposes: So far，in China the study on the pre—camber calculation mostly focuses on the continuous rigid structure and continuous girder bridge constructed with the cantilever erection method while a little on the pre—camber of the steel—truss girder bridge and little on the pre—camber of the steel—truss girder cable—stayed bridge．This paper studies the calculation method for the pre—camber of the steel—truss girder cable—stayed bridge and it can provide the reference to the design and construction of pre—camber of the similar steel—truss girder bridge in the future．

Research conclusions: To the steel—truss girder cable—stayed bridge，firstly，the length of the upper chord should be set as variables and the multiple constraint equations should be established to the influence vectors of the the length change of the upper chord on segment camber or other restriction conditions．Then，the solution circumscription should be given and the most closed ones should be solved to get the pre—camber that is the most closed to the theoretic results of the multiple constraint equations．Finally，the theoretic solutions should be rounded，merged and adjusted to obtain the rather ideal pre—camber．

Key words

steel—truss girder / cable—stayed bridge / pre—camber / influence vector

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ZENG Yong—ping, CHEN Tian—di, YUAN Ming, et al. Study on Pre—camber of Large Span Railway Steel—truss Girder Cable—stayed Bridge[J]. Journal of Railway Engineering Society, 2010, 27(10): 78-81

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