The Study On Shear Capacity Of A New Type Specially Shaped Columns Joints

The specially-shaped column structures have been widely used in practice of occupant buildings in China as this type of structure has many advantages, i.e., improving utilization rate of building space, increasing available aero of building, decreasing structure weight, etc. In the region with intensive earthquake, however, the application of this type of building is limited owing to insufficient shearing resistance of joint between the column and beam. The steel reinforced concrete specially shaped column can deal with this flaw successfully. It is known that the common steel reinforced concrete could cause some inconveniences to construction. The objective of this paper is to use a new type of steel reinforced concrete specially-shaped column to simplify construction, which can popularize the application of specially shaped column structure.In terms of constructional feasibility, the new type of steel reinforced concrete specially-shaped is studied to find the difficulties in construction and put forward some related measures to solve the problem. Based on a concrete smeared cracking isotropic constitutive model and using nonlinear finite element analysis programmer ABAQUS. FEM analyses are conducted on three common concrete joints of specially-shaped column with shape of L, T and+of a frame structure in the region with intensity8of Chinese intensity scale, and the joints of corresponding new type of specially-shaped column of the same structure. Some joint characteristics are obtained, including the load transfer path before and after cracking, stress distribution, crack’s occurrence and development and final failure mode of the joints, etc. By comparison, it is shown that the increase of element capacity structures with this steel reinforced concrete is significant, which can provide some evidences for popularizing the application of specially shaped column structure using the steel reinforced concrete to enhance joint shear resistance.