The Fatigue Life Evaluation Of PC Composite Box-girder With Corrugated Steel Webs

Corrugated steel web PC composite box girder is more popular in recent years a new type of structural form, it improves the traditional PC box girder span ability and the economic effect, in foreign countries have a lot of research and application, but our country the study of the new structure is still in the initial stage, especially the study of the structure fatigue performance, theory is not perfect. In this background, a large number of domestic and foreign research results, this paper study on the fatigue performance of the structure of the new theory, mainly has the following several aspects.First, this paper introduces the combination of corrugated steel web PC box girder structure characteristics and fatigue failure mechanism. Simply describes the fatigue damage characteristics of three stages of development, thus put forward the difference between the fatigue damage and general strength damage. And connecting with the domestic and foreign research present situation and the relevant specification, analysis of the three common methods of the study on fatigue.Then, based on the current Chinese code in the construction of highways and city Bridges have not fatigue load spectrum of vehicles was a blank, the relevant provisions of the reference of foreign norms and domestic scholars study, put forward the reference model of vehicles in highway bridge fatigue load spectrum.Again, aiming at the uncertainty of the fatigue process, introduced the concept of reliability, and the fatigue life of reliability and the traditional evaluation method of effective collection, put forward the combination of corrugated steel web PC box girder detail fatigue life reliability evaluation method, to study fatigue provides a new train of thought of the details.Finally, on the basis of the theory, by taking a some bridge as an example, has carried on the part of the corrugated steel web plate details of fatigue life estimation,and the results are analyzed and Suggestions on raising the corrugated steel web PC composite box girder details of fatigue life and reliability of some measures to provide certain reference for practical engineering application.