The Stability And The Ultimate Load-Carrying Capacity Study On The Steel-Tube Truss Rib Arch Bridge

The steel-tube truss rib arch bridge with extroversion is steel structure,also is steeltube-CFST arch bridge because of the concrete in arch springer.it is the novel style of arch bridge and it is worthly of being promoted.therefore the study of the mechanics of this style of bridge have high engineering value.By the ANSYS,this paper's work is the study of stability and the ulimate load-carrying capacity of it.The main contents and the achievement of the paper are described as follows: a.Combining the nonlinearitic finite element theory and the experience in the solution of the nonlinearitic question,the difficulty in nonlinearitic question and the methods how to solve the difficulty is summarized.Basing on the methods ,how to use manual intervention in the ANSYS to prompt the solution of the nonlinearitic question is illuminated. b.Three methods for evaluation of the stability and the ultimate load-carrying capacity ( linearity,geometric nonlinearity,material nonlinearity and geometric nonlinearity)are consided in the steel-tube truss rib arch bridge of the xiangjiang with extroversion. there methods and the result is Contrasted,and what cause this difference is discussed.And the rusult show that the double nonlinearities is more fit to fact than the linearity in computing the stability coefficient and the ultimate load-carrying capacity of the large span steel-tube truss rib arch bridge. c.After the stability and the ultimate load-carrying capacity of the bridge researched, the ultimate load-carrying capacity is calculated under the different working condition of this bridge.And the unstabilitic mode is described and what cause these is discussed.The result show that this bridge is safe even in the most unsafe working condition. d.Basing on the design, this paper analyse the different length of CFST in this bridge. the rusult of research show that the different length of CFST have much influence in the stability and the ultimate load-carrying capacity of it. The result in this paper is sinficant for construction and management of steel-tube truss rib arch bridge of the xiangjiang.and it is also useful for reference to the readers who engage in this style bridge design in many aspects such as avoiding errors in the process of the design ,reducing engineering investment and insuring the engineering security.At the end, this paper prepare the example of the steel-tube truss rib arch bridge and steeltube-CFST arch bridge.