Static Analysis & Researches For Earthquake Resistant Behavior About Flexible Suspension Bridges

Flexible suspension bridges fully exert the characteristic that the high-strength steelwires can bear greatly high tension, so we can build larger bridge without higher tower. The bridge structure has the concise deck, consumes less steel products and can be easy builded and maintained. Its model is beautiful and the construction cost is low. In recent years, more flexible suspension bridges were gradually constructed in cities and scenic areas, and have been more ideal structure system in mountainous areas with inconvenient transportation. This article uses non-linear finite element theory, and unites design methods of long-span bridges and actual situation of flexible suspension bridges to carry on the detailed analysis for the structure. In the static analysis, the article has mainly discussed distortion control to it, and finally proposed two methods to decrease distortion by increasing "the structure gravity rigidity". Regarding the dynamic analysis, this article has mainly discussed the earthquake resistant behavior of it. By contrast its dynamic speciality with that of the common suspension bridges,it has discovered relations between its structure feature and its dynamic speciality . Finally the article uses response spectrum methods and time history methods to analyse earthquake responses of flexible suspension bridges . Through analyses and contrasts, it has find some important aspect that should be paid more attention in the course of seismic design of flexible suspension bridges and pointed out the main flaws of response spectrum methods. My aspiration is that, based on satisfing security, applicability, economy and artistry of flexible suspension bridges, fully exerting the traffic function of it, the article can develop the new domain for the development of suspension bridges.