Long Structure Thermal Stress Analysis

(1) The aim of ResearchAt present, super-length building is becoming very popular. By requirment of their functions .expansion and contraction joint is not supposed to be located or at least frequently located in super-length building. If not properly tackled, the temperature deformation and temperature stress in super-length reinforced concrete structure building may cause the cracks and may even affect the normal operation of the structures, if worse. Study the code for design of the concrete structures, temperature variations are even not taken into consideration in super-length building. Just only some construction treatments considered. Therefore, temperature problems is one of vitally important research topics in structure designing of super-length building. The aim of this research is analyzing the distribution of the internal force in super-length building, and put this character into super-length building design.(2) The method of researchBy analyzing the character of temperature in super-length building in Zheng Zhou, the principles of the calculation of temperature distribution and the value of the temperature action are improved. In order to using these values into design, the paper finds out the main value of the temperature action from the various condition. By analyzing the fact, we have made the model for finite element method.(3) The result of researchThe paper has attained the value of the temperature stress and deformation in super-length building, when the form of the building is changed by finite element analysis. The conclusions that weakening the shear-wall stiffness is a very efficient method to minish the temperature stress.(4) ConclusionNormally, the temperature deformation in first floor of the super-length building is shorter than in the top's and the max value can be found in the peak of the building. But the largest relatively deformation is found out at the first floor. Weakening stiffness of shear-wall and thickening the slab will enlarge the relative deformation at bottom. On contrast, will minish the whole deformation of the building. The maxvalue of the axial stress in the beam can be found at the first floor of the building. Weakening the stiffness of shear-wall and thickening the slab benefical to minish the axial stress in beam of the super-length building. But the bending moment will be enlarged. All these rule can be use directly by the engineer, in order to resolve the problem about the super-length building. The cooperating with others working in construction is most important. The effect of the elasto-plasticity of concret and stress relaxation need to be study in the future.