Analysis And Design Practice Of Temperature Stress In Ultra-long Concrete Frame Structures

Along with the economic development and the improvement of living standards of Chinese people, people have increasingly high demand of the function of the building, especially the public building which gradually to the development of large-scale and comfort. Because there are more and more ultra-high, ultra-long and long-span public building, and for the unique material of the concrete structure, after the size exceeds a certain limit, produced by the external temperature effects the structure of its temperature stress will be significant influence on the building. The current specification for concrete structures of the maximum length of expansion joint spacing is conservative. While allowing for code in the case of certain measures can relax appropriately expansion joint spacing, but the ultra-long concrete structure design method is still not unified, clear rules. This article as a starting point, in the use of finite element analysis software, computer analysis through the calculation of engineering design practice, summarized that under the effect of temperature stress and strain distribution law of extra-long concrete structures. The structural design will play a role of reference for the future.The main work of the article is based on the local meteorological conditions designed temperature conditions, establishing of ultra-long concrete frame structure under temperature load internal force equation, the finite element model is established according to the construction conditions, respectively, under the action of the non temperature under the action of temperature effects under different temperature conditions and calculation and analysis of three kinds of model, and compare with the result of the analysis.The main research results obtained for the concrete frame structure integral calculation index that temperature effect mainly influences the displacement of the structure. For structures, the influence of the temperature effect on the internal forces of the components is mainly manifested in the beam axis force and bending moment on the pillars. Floor suffers the largest influence of the axial forces. Analyzing vertical layout, building the first floor component temperature stress is the largest; the top temperature deformation is the largest. On the analysis of plane layout, the central beam slab structure long direction axial force, the largest length direction end bending moment biggest pillars. And the structure stress stiffness mutation place in mutation.The innovation of this article is to fill in the current specification of super-long concrete frame structure design method of blank.On the basis of collect and analyze of existing research results of home and abroad, the writer combined with specific engineering design examples to discuss the temperature stress analysis of ultra-long reinforced concrete frame structure which under the normal use. In order to provide design reference of multiple ultra-long reinforced concrete frame structure temperature stress analysis and crack control.