The Temperature Stress And Its Control Technique Of Annular Super-long Concrete Structure

This thesis summarizes the status of super-long concrete structure at home and abroad on the temperature stress study. This thesis firstly summarizes the status of the study about the super-long concrete structure in the temperature stress at home and abroad.And it then-also introduces the temperature stress of elasticity and finite element theory at first. And it also introduces the elasticity and the finite element theory of the temperature stress. Second the concrete structure's temperature effect and the time-dependent character are explained. Secondly the temperature effect and the time-dependent characteristic of the concrete structure are explained. Through analyzing the time-dependent characteristic of the concrete, it puts forward a method to calculate the temperature load when analyzing the temperature stress and strain. This provides a theoretical basis to accurately calculate the temperature stress and strain of super-long structure.Up to know the research of the super-long structure is mainly about the rectangular structure, less about the annular structure. This thesis analyzes an annular super-long structure model's temperature stress to find its characteristics. It establishes some models with different radiuses, ring bandwidths and bound=restrict conditions, then to interpret the effects of these factors to the annular super-long structure temperature stress when they are under the same temperature load. It tells the distinction between annular super-long structure and rectangular super-long structure by comparing the models between them. This essay through researching the control technique of super-long structure, comparing the differences of prestressing and post pouring-join in super-long structure, then reaches the control measures features of the annular super-long structure.Based on an actual annular super-long structure--Huaibei stadium and its scene monitoring, this thesis explains the temperature stress of annular super-long structure. The data from the monitoring proves that the temperature distribution is affected by sunlight and season. In the indoor structure, concrete temperature changes are similar to the local temperature changes, and the concrete temperature in outdoor is significantly higher than the local temperature because of the sunshine, so we should separate the indoor and outdoor temperature when we are calculating the temperature load. The monitoring temperature data shows that radial and circumferential strain are decreased obviously, which means the prestress is effectively established, and it also displays the function of the prestressing and post pouring-join.Taking Huaibei stadium for example, the Paper introduces how to calculate the temperature stress and strain in detail. By comparing the whole model and the block construction model, it analyzes the temperature stress's characteristics and the controlling techniques of the annular super-long structure. Finally, the thesis compares the long-term strain data and the theoretical calculations, and it shows the analysis of the error sources.