Analysis On Temperature Stress Of Massive Bridge Concrete And Its Sensitive Factors

With the rapidly expanding of our country transportation, the capacity of bridge design and construction technology by leaps and bounds, lots of massive bridge concrete structures have been made. But also many problems appear. One obvious problem is that as a result of big-size and complexity of the structure, the temperature stress surpasses the limits frequently, the temperature cracks come along.The temperature stress as well as the resultant stress cracks are the factors which must been considered in the designing, In the new code for design of highway bridges and culverts which has been further stressed, it tells us the factor can not be neglected in the project. Although engineers have become aware of this problem, and many specialists have also done a lot of studies, but some problems are still there, we need do more still.The paper pays more attention to the analysis suited to bridge structure for the difference between massive concrete bridge structure and the general structure.Firstly the status of the research on the mass concrete and its related theory is simply described in the paper, although not much, but it has layed the necessary theoretical basis.In the Chapter IV, some research about the temperature stress of the massive concrete structures and its related factors is done. In this paper, only a few key aspects of the analysis have been studied, for example, the relationship between the rate of water flow and cooling efficiency, the depth effect of outside temperature, the effect of structure size on the stress distribution, as well as simplification of the boundary conditions. Every aspect is derived with theoretical deduction and finite element method, and more analysis is made for the bridge structure so as to get the conclusions used for the structure of massive concrete.