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Frontiers of Structural and Civil Engineering >> 2019, Volume 13, Issue 6 doi: 10.1007/s11709-019-0572-0

Investigation of the interior RC beam-column joints under monotonic antisymmetrical load

. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China.. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China.. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China

Accepted: 2019-10-22 Available online: 2019-10-22

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Abstract

The paper presents numerical findings of reinforced concrete interior beam-column joints under monotonic antisymmetrical load. The finite element models considered compression and tension damage were calibrated by test results in terms of the load-displacement, failure modes, and strains of longitudinal steel. The emphasis was put on studying the effects of hoop reinforcement ratio in joint core and the axial compression ratio on the responses of the joints. The results show that, in addition to the truss and strut-and-tie mechanisms, the confinement mechanism also existed in the joint core. A certain amount of stirrup is not only able to enhance the confinement in joint core, undertake a part of shear force and thus to increase the shear capacity, prevent the outward buckling of steel bars in column, improve the stress distribution in joint core, delay cracking and restrain the propagation of cracks, but also to increase the yield load, decrease the yield displacement of beam and improve the joint ductility. However, excessive horizontal stirrups contribute little to the joint performance. In a certain range, larger axial compression ratio is beneficial for the joint mechanical behavior, while it is negative when axial compression ratio is too large.

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