Research On Long Term Performance Of Prestressed Concrete Box Girder Bridge Based On Traffic Growth

With the rapid development of highway construction, a growing number of roads and bridges emerge. prestressed concrete box girder bridge, with its excellent mechanical properties, mature construction technology, comfortable driving quality, has made remarkable achievements in the bridge construction in our country. However, due to the influence of traffic and bridge design, construction, etc., active prestressed concrete box girder bridges have appeared many problems in the process of operation. In this paper,combined with practical engineering, the long-term performance of long-span prestressed concrete box girder Bridges problem is analyzed and the main content of this paper is as follows:1. Summarize and analyze the effects of long-term deflection of long-span prestressed concrete box girder bridge, taking actual project as the background, do sensitivity analysis of relevant factors, it is concluded that the factors affect the progression.2. Relevant literature indicates that few scholars analysize the influence of live load late deflection of the bridge through the actual traffic. On the other hand, although the live load is an important influencing factors, but its calculation quantity is different from person to person, it is difficult to obtain a more quantitative and persuasive analysis. In this paper, on the basis of the research of other factors, the influence of live load effect on the long-term deflection has been studied. With some typical highway of jiangsu province as an example, the paper analyzed the traffic flow characteristics, and established the multimodal vehicle load model based on traffic flow. Finally,the paper put forward conclusion that live load effect on the bridge and amendments of calculation parameters in specification.3. This paper analyzed the causes of formation of cracks in the box girder, and put forward relevant treatment measures.4. Combining some engineering examples, from the design, construction, maintenance, management, strengthening of five aspects, such as relevant treatment countermeasures and Suggestions are put forward.