The Study Of The Influence On Structural Behavior And Linear Control During The Construction Period Of Cantilever Casting Continuous Beam Caused By Temperature Effect

Prestressed concrete continuous beam is widely used in bridge construction because of its various advantages, such as greater structural rigidity, smaller deformation, smoother, more comfort driving, fewer expansion joints*simple maintain, and better performance, and so on. The temperature effect is an important load which is need to be considered in bridge design and construction. It is regulated in specification in various countries, but the relevant provisions are different. The temperature field and temperature effects are affected by various factors, such as the external environment, the structure style of the box girder, and the materials and so on. The mechanical performance of the long-span cantilever casting continuous beam are obviously affected by the temperature effect, and the study is need to be done for each bridge.The study was based on the construction monitoring of The Ying River Bridge and The Huai River Bridge continuous beam. The experiment of temperature field was tested during the construction, and the curve fitting of the temperature gradient was done. The temperature effect were monitored during the period of the cantilever construction and after the closure of the main span. At the same time, the calculation analysis of the temperature effects were carried out by the fitting temperature gradient curve. The linear control measures about the temperature effect were proposed. According to different temperature gradients, the temperature effects were conducted for the Ying River continuous beam by3construction conditions:the maximum cantilever stage, before and after the mid-span closure. The characteristics of the box girder temperature effect were summarized through the comparison analysis. The construction linear control and stress analysis of these bridges were useful for similar bridges.