Three Dimension Finite Element Simulation And Analysis Of The Temperature Field And Creep Stress Field In Concrete Arch Dam

Arch dam, which is fastened to the base rock, is a high_order, hyperstatic, spacial body case structure. It has not only arch function but also girder function, but its main loads are passed to each dam abutment by means of arch function. The stresses of arch dam can be autoregulative, and its overload capacity can be about 5-11 times than design loads and it has the advantage of economy and safety, so, more and more designers enjoy this dam shape. Because of the difference of shape character and function between arch dam and gravity dam, the effect of loads, such as seepage pressure and gravity in arch dam, is smaller than that in gravity dam, but, the thermal load and dam contraction are turned into main loads. Arch dam is slice and it is sensitive to the change of surrounding temperature and water temperature. The change of temperature in the dam is big, and except for the dam crest is free, the other three surfaces are restraint by base rock, and so, temperature deformation is big. Therefore the change of temperature has great effect on the stresses of concrete arch dam.In this article, according to heat conduction theory, elastic creep theory and finite element theory, the temperature field and creep stress field in the arch dam during construction and operation are simulated and analyzed by means of three dimensional finite element relocating mesh method, and the distribution law of the temperature field and creep stress field in the arch dam during construction and operation are systematically studied, and according to the construction process of concrete arch dam, the effect of lamination placement, construction interval, elastic modulus change, thermal insulation change, surrounding temperature change, concrete creep and autogenous volume change on thermal stress in the arch dam are also considered. Combined with engineering practice, example is provided so as to validate the program.The computing program provided in the article has perfect before_treatment and after_treatment, and it also can be operated in windows98 and windows2000. Its interface is perfect and it is also easily visual.