Experimental study on seismic behaviour of plug-in assembly concrete beam-column connections

摘要

A new type of plug-in assembled concrete beam-column connection based on partial steel-concrete composite structure is proposed to improve the assembly efficiency of assembled concrete structure. This paper presents experimental and numerical investigation on this plug-in assembly connection. Using the size of a section steel as a variable, low-cycle reciprocating loading tests were performed with seven plug-in assembly connection specimens and one cast-in-place joint. The response characteristics of specimens such as failure mode, hysteretic performance, skeleton curve, energy dissipation capacity, bearing capacity, stiffness degradation, and strain were compared and analysed. Owing to the combination effect of splicing zone and the geometric nonlinear deformation of different materials, the energy dissipation capacity and initial stiffness of this type of assembly connections are slightly lower than those of whole cast-in-place joints, but the bearing capacity of assembly connections is higher. The bearing capacity of plug-in connections are mainly controlled by the cross-section bearing capacity of the composite beam. With reasonable structure and high processing quality, and plug-in assembly connection will have excellent bearing performance.