Analysis On Compressive And Shear Bearing Capacity Of Square Steel Tubed Reinforced Concrete Short Columns

With the development of the society, the improvement of people’s living standards, modern civil buildings are gradually developing in the direction of large span and tall, the frame structure of reinforced concrete column in the vertical load increases, so you have to control the axial compression ratio, in order to meet the requirements of corresponding building codes for member ductility, this will cause the frame column section increases, so easy to form in the bottom of the top or high-rise buildings of reinforced concrete short column. Short column shear generating brittle failure, is a big security hidden danger in the building structure, need of reinforced concrete short column reinforcement measures, to improve the ductility, the optimization of its seismic performance.This paper first introduces the development of reinforced concrete short column reinforcement measures at home and abroad and the research status, research has shown that the constraint of reinforced concrete filled steel tubular short column method, based on the empirical formula calculating the square steel tube constraint compression bearing capacity of normal section of reinforced concrete short column and the axial compression ratio under certain conditions, the shear bearing capacity of the horizontal loads, is under the influence of steel content parameters, its bearing capacity. Through calculation and analysis, as the steel ratio increases, the approximate linear relationship between shearing resistance increases gradually, gradually increase the compression bearing capacity, but increases as the steel ratio, increase the bearing capacity of gradually reduce, considering the economic factors, determine the steel ratio is0.2square steel tube pole constraints, the optimal parameters of reinforced concrete short columns.Secondly, by ABAQUS to establish square steel tube reinforced concrete short columns of the three-dimensional entity model, performance of short column axial compression and shear performance analysis, get the axial stress of short column N-A displacement curve and the unidirectional thrust force-displacement curve. By simulating calculation and analysis, as the steel ratio, square steel tube constrained compression bearing capacity of reinforced concrete short column increase gradually, but its growth gradually reduce; And as the steel ratio increases, the shear bearing capacity is also growing. However, with the increase of steel ratio means that the increased cost of materials. Therefore, according to economic and engineering projects to engineering personnel demand and so on comprehensive factors to select the suitable steel ratio.