Experimental study of earthquake-resilient end-plate type prefabricated steel frame beam-column joint

Abstract

In order to avoid the complex stress field of traditional beam-column joints caused by arranging end side plate or support plate on beam end, and realize the earthquake-resilient of joints, based on the plastic damage control idea, a kind of end-plate type prefabricated steel frame beam-column joint (EPPSFJ) is put forward in this paper. The new type joint mainly consists of the circular steel tube column with cantilever beam, ordinary beam, and the connecting devices. The EPPSFJ can realize stiffness control of the connection by adjusting the thickness of the flange cover plate (FCP), the distance between the middle bolts and other parameters, and make use of the plastic distortion and friction sliding of the FCP to dissipate the seismic energy, so as to ensure the basic elasticity of the structural member and realize the rapid post-earthquake repair of the joint. In the article, the low cycle load test is carried out on five specimens and one repair specimen to obtain the failure pattern, hysteresis curve and strain curves of joints etc., The impact rule of parameters such as the thickness of cantilever beam flange, the distance between the middle bolts, thickness and weakening form of FCP on the seismic performance is researched. The experimental study shows that: the joints have good seismic performance by reasonably designing parameters of bolts and the FCP, and the plastic distortion is focused on the FCP easily replaced, which make sure that plastic damage does not occur at the structural member. The repaired specimen still has great energy dissipation capacity, ductility and other seismic performance indexes, which indicates that the joint can be quickly repaired post-earthquake through replacing the FCP and other connecting devices.