Experimental Research On Shearing Bearing Capacity Of Cross-shaped Frame Joint With SRC Special-shaped Column

Steel reinforced concrete special-shaped column structure system is a new structural form in recent years.Steel reinforced concrete special-shaped columns structure has much evident superiority of reinforced concrete special-shaped column structure.Especially it can overcome the weakness of reinforced concrete special-shaped column structure,such as bearing capacity is insufficient,seismic performance is poor,and axial compression ratio is too low.So,steel reinforced concrete special-shaped column structure has great development potential and application space in our county.Although a lot of researches on the seismic behavior and bearing capacity of steel reinforced concrete special-shaped column have been made both at home and abroad,experimental and theoretical studies on frame joints with steel reinforced concrete special-shaped column are not enough.The frame joint with steel reinforced concrete special-shaped colunm is one of the most important members in steel reinforced concrete special-shaped column structural system.In order to extend steel reinforced concrete special-shaped columns' suitable scope,and consummate the steel reinforced concrete special-shaped column structural system,researching the frame joint with steel reinforced concrete special-shaped column is necessary.Based on the research achievements of reinforced concrete special-shaped column joints and steel reinforced concrete joints,the crack resistance and shear bearing capacity of cross-shaped frame joint with steel reinforced concrete special-shaped column had been studied comprehensively through experimental and theoretical perspective.According to the experimental research on 4 cross-shaped frame joint with steel reinforced concrete special-shaped column specimens under low cyclic reversed horizontal load,the failure process and patterns were observed.The influences of steel layout fashions and the ratio of section height to section thickness on the bearing capacity of tiame joints are discussed,and the enhancing coefficient of flange to the shear strength is given.Based on the experimental results and theoretical analysis,the formulas about crack resistance and shear beating capacity of different type of cross-shaped frame joint with steel reinforced concrete special-shaped column under right loading are derived.The formulas computation results are satisfied well with the experimental results.The study results will be the basis of establishing reasonable calculation theory and design method of crack resistance and shear beating capacity of cross-shaped frame joint with steel reinforced concrete special-shaped column.Thereby,it is useful to promote the development and application of steel reinforced concrete special-shaped column structure system.