Study On Temperature Stress Of Over-length Pool Structure In Beijing

Tructural design code for special structures of water supply and waste water engineering is give that expansion joint is 30m if the burying type cast-in-place reinforced concrete pool is in the soil ground,the size of a water tank in the tenth water plant in Beijing is 61m×61m,the temperature stress of the over-length pool has not been studied systematically.In this paper, considering the temperature of the environment and the shrinkage of the concrete to ensure comprehensive temperature. Establish a reasonable finite element model and analysis the internal force distribution of temperature,and then analysis the influence of the constraint of the bottom of the pool.Finally, the effect of temperature and other loads on the internal force of the structure of the tank is analyzed.The main research works are summarized as follow:1 Analyzed the types and characteristics of temperature effect,temperature strain,creep strain and shrinkage problem,while also introduces the algorithm for environment temperature difference and the shrinkage temperature difference.2 Using the finite-element software ABAQUS to analyze the temperature effect of the super long concrete pool,and then analysis of over-length concrete pool structure on the internal force distribution of the temperature effect. The results show that the pool structure under the effect of temperature,the maximum displacement occurred at the four corners of roof,the entire pool basically has a tensile stress,the maximum tensile stress is concentrated in the middle part of the bottom of the pool wall,the maximum bending moment occurs at the the intermediate portion of bottom of the pool wall.3 Discussion on the effect of different constraints on the temperature effect of super long concrete pool and building different models using ABAQUS respectively, contrast pool’s internal force under different constraints.Results showed that constraints have a large influence of the temperature effect.When changing the constraint, the displacement of the pool can be have a great release,stress and bending moment are greatly reduced,so in practice, set the sliding layer can be have a very good effect of reduced temperature.4 By comparing the results of several groups of combined working conditions to study influence of temperature.Results show that the influence of temperature on the wall are relatively large;Temperature effect on the internal forces of the pool is very big,especially the wall and floor, internal force increases obviously.