Evaluation And Study On Reliability Of The Tied Arch Bridge's The Structure Components

The tied arch bridge is one of the vigorous styles in our country recently. Many engineers use this style for its excellent capability such as beautiful model, proper force, simple construction etc. With the increasing of traffic, especially the automotive overloading, there are many deficiencies and damages in existing tied arch bridges. So, it's necessary to analyse and evaluate the structure reliability of the existing tied arch bridge. In this dissertation, the structure reliability of the tied arch bridge is researched by Structure Reliability Theory and its reliability assessment model on reliability is established. The system reliability analysis of the tied arch bridge is presented based on the three components of arch rib, girder and suspender. Now mainly completed a following work: Firstly, combine with actually engineering, to the structure reliability of practical compute a method:Two rank matrix central point methods , improvement of two rank matrix methods and "JC method" carries on the analysis comparison, making sure the adoption"JC method" is this thesis calculation method. Secondly, basis on actual examination data, considered change of the structure resistance and loads, it calculate current reliability index sign of the structure component. Considering actual structure system in, the component the ability and lotus carry of relativity proves the structure system comparison reasonable of reliability index sign, complete the valuation of the current structure loading ability. Finally, draw lessons from the foundation that the experts, we led into time parameter "t" in the structure resistance model and the loads model and put forward simple,the practical dynamic state credibility calculation method. Combining with reliability index sign of target, we confirm current structure reliability index sign and carry out structure surplus service life off the bridge.