十形鋼管混凝土異形柱正截面承載力全過程分析
[Abstract]:At present, people have higher and higher demands on the living space environment. Compared with common frame or frame shear structure, special-shaped column structure can adapt to the high flexibility of building space, and is widely used in high-rise building design nowadays. Compared with the brick concrete structure, the weight of the structure is obviously reduced, and the traditional rectangular column protruding wall is avoided, which affects the aesthetics and increases the building area at the same time. In addition, the wall adopts heat preservation, heat insulation, light weight and high efficiency materials, which conform to the general direction of contemporary construction industry and get wide attention in practical engineering. However, due to the longer section length of special-shaped columns, the seismic performance of special-shaped columns is lower than that of common reinforced concrete frame structures. In order to make special-shaped column structures more widely used, it should be deeply studied from various aspects. The research status and existing problems of concrete-filled steel tubular special-shaped column structures at home and abroad are reviewed. Based on the assumption of plane section, a formula for calculating the relationship between bending moment and curvature of normal section of concrete-filled steel tubular column with ten sections is obtained, and the iterative solution software is compiled by MATLAB. The results show that due to the arrangement of steel pipes on the column section, under the condition of moderate section steel content, the ultimate moment value of the tenth section is greatly increased than that of the rectangular section, which is about 2 times higher than that of the rectangular section. The ultimate curvature is reduced by 50 and the ultimate curvature of the section is influenced by the strength grade of concrete, but the ultimate bending moment and the ultimate curvature of the section are not affected by the yield strength of the steel tube. Increasing the cross section area of steel tube has obvious effect on increasing ultimate bending moment and reducing limit curvature. Using the finite element software Adina and the moment curvature beam element, a static elastic-plastic push-over model of a single-layer concrete-filled steel tubular column is established. The results show that the increase of concrete strength is beneficial to the improvement of the bearing capacity. The effect of changing the strength grade of steel tube on improving the bearing capacity of section is not obvious, and the section area of steel pipe has remarkable effect on improving the bearing capacity. The ultimate moment values of special-shaped columns at the end of failure are consistent with the limit moment in the moment curvature curve.
【學(xué)位授予單位】:華北理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU398.9
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