Optimal Design Of Suspender Replacement In Concrete Filled Steel Tubulur Arch Bridge

In the recent twenty years, the concrete filled steel tubulur arch bridge has been developing rapidly in our country, the application of the concrete filled steel tubulur arch bridge has reached advanced levels in the world. However, with the increase of the operating time and other resons such as fatigue and corrosion, there are many suspenders that have been damaged in recent years. Hence more and more concrete filled steel tubulur arch bridges are facing the problems of suspender replacement. Therefore, it's necessary to further the research on the optimal design of the suspender replacement.Based on the actual bridge project, the finite element software is applied in this paper to analyze the stress system of the suspenders and conduct the optimal design of the suspender replacement in the concrete filled steel tubulur arch bridge. The main contents of this paper are as follows:1,Analyze the stress system of the suependers under the dead load and the live load, in order to get the law of the internal force of the suspenders and the proportion of influence that comes from the load upon the internal force.2,Conduct the optimal design of the suspender replacement in the concrete filled steel tubulur arch bridge, including the optimal design of the target forces and the tension forces in the suspenders. Make a comparison between the optimization results of the zero-displacement and the least bending energy method. In the meantime, compare the optimization results of the influent matrix and the forward-analysis iterative method, so as to draw the general conclusions of the optimal design of the suspender replacement.3,Analyze the finished dead load state in the post-optimality and the unoptimized case. Thus compare the internal force of the structure of the bridge and evaluate the optimization effect.4,The analysis of the finished operation state in the post-optimality case, of which the results show that it's effective to use the least bending energy method and the forward-analysis iterative method to conduct the optimal design of the suspender replacement in the concrete filled steel tubulur arch bridge.