| In recent years,with increased levels of housing,10～15-story high-rise residential development in many areas, and is considered to be medium-high urban residential building of well-off society development is more appropriate.High-rise structures, due to the increased height, the lateral stiffness of the structure must also increase in order to ensure lateral requirements set forth, and seismic performance of structure is required to have the appropriate.Appears to increase leg of reinforced concrete special-shaped column axial compression ratio of cross section to improve structural rigidity and reduce artifacts called wide limbs with special-shaped columns in this article.Numerous experiments proved that with broad-limb special-shaped column can effectively resolve the rigidity of high-rise residential and axial compression ratio limit problem.Currently, Shanghai has built with broad-limb special-shaped column frame system of two pilot residential high-rise, and high-rise residential with special-shaped column structure has been confirmed the applicability of the system.With the popularization and application of reinforced concrete special-shaped column structure, for special-shaped column structure system research (including components, behaviors of plane and spatial structure of the framework) has become a hot research topic in the field of concrete structures.Research on special-shaped column frame residential building has been included by the Ministry of science and technology and the Ministry of construction organization and implementation of major national high-tech engineering.Thus, special-shaped column structure more and more often are applied to engineering practice.The main contents of the paper are:First of all, with broad-limb special-shaped column of reinforced concrete components, depending on the properties of materials and components, determine the constitutive model in a finite element software ANSYS, and integral to the analysis of the finite element model.In finite element analysis, reinforced concrete solid element SOLID3D.W-W five-parameter failure criterion based on test and brief analysis of the causes of concrete crack and its treatment.Secondly, on the basis of relevant literature, taking into account the longitudinal reinforcement and the surrounding concrete stress-strain curve of concrete and anchorage slip down, Stirrup encryption is also taking into account influence of Stirrups to concrete constraints, and for the special-shaped reinforced concrete cross-section bent column (including1-shaped, t-shaped cross section) carried out a study on the nonlinear theory.In addition to this, take this for example, understanding finite element analysis program ANSYS analysis of the whole process. After special-shaped columns of finite element mesh, by ANSYS finite element software program to calculate load angle of axial-load ratio, and other factors affecting the ductility of special-shaped column structures, and stirrup ratio reduces the longitudinal reinforcement unbraced length, delay the buckling of longitudinal reinforcement, led to a marked improvement in the ductility of special-shaped columns. In addition, the strength of concrete on ductility of special-shaped column also has a significant impact.Finally, the article using a large, general purpose finite element program ANSYS12.0, only for a cross section of reinforced concrete wide-leg elastic finite element analysis of special-shaped column structures. By comparing groups of cross section column calculations, draw in elastic condition, variation of special-shaped column:aspect ratio are major factors influencing with broad-limb special-shaped columns subjected to stress and deformation and its deformation is mainly bending and shearing deformation or shear deformation, their morphology is mainly bending-shear failure of shear failure or damage. |
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