Experimental Study on Seismic Behaviour of Angle Steel Connections with Concealed Corbel of Fully Assembled Frame Beam and Column

A method of "concealed corbel angle steel and bolt" is proposed to connect beams and columns of assembled frame. To study the seismic performance of the connection is designed an ordinary concrete beam specimen and three in the form of assembly connection specimens. The hysteretic curve, skeleton curve and ductility coefficient of cast-in-place specimen and angle steel connection specimen with concealed corbel are analysed by low cycle repeated load test. The influence of the angle steel thickness and the additional rib on the specimen in the assembly connection scheme is discussed. The test results show that: compared with ordinary cast-in-place concrete specimens, the assembly connection specimens have higher bearing capacity under the action of low-cycle reciprocating load. The hysteretic curves of the assembly and connection specimens were relatively full, and the displacement ductility coefficient was greater than 3.0, indicating that the assembly and connection specimens had good ductility. Increasing the thickness of the Angle steel and the additional ribs can improve the bearing capacity of the specimens. In particular, increasing the thickness of the Angle steel can significantly improve the bearing capacity of the specimens assembled and connected and reduce the damage of dark corbel before loading.