Abstract
Concrete-filled steel tubular (CFST) column to steel beam joint with the ductility and energy dissipation components is a type of connection which is used in prefabricated structures, to improve the capacity of connections and construction efficiency. In this paper, two different type of steel beam to CFST column connections with the penetrated high-strength bolts and end-plate are investigated, i.e., steel beam to CFST column connection with end plate (CJ-1), and T-stub bolted (CJ-2) connections. The finite element model (FEM) of steel beam to CFST column connection with the penetrated high-strength bolts under cyclic loading are conducted based on the whole process of the nonlinear explicit analysis method using ABAQUS. The feasibility of FEM is verified by a set of experimental results performed by our research group, as well as available test results from other researchers. The failure modes, bearing capacity, energy dissipation capacity and ductility and rigidity degeneration were studied. As a result, the load-displacement hysteretic loop curve of CJ-2 connection is plump. However, the hysteresis curve of CJ-1 shows pinching phenomenon. The value of buckling load and ultimate load of CJ-2 increased by 28 % and 30 % respectively, compared with CJ-1. With respect of stress analysis, the plastic strain accumulation position distribution is relatively uniform duo to the T-stub connection, avoiding the penetrated high-strength bolt early yield or fracture. The results show that the steel beam to CFST column connection with penetrated bolts and T-stub connection has good seismic capacity.
Highlights
Concrete-filled steel tube (CFST) has been widely used in civil engineering structures, because they have been proved to be inherently efficient in load carrying capacity, fire resistance, ductility and energy absorption capacity, and fast in construction according to the Ref. [1]
Han and Li. [12] investigated the seismic behaviour of the composite joint consisting of circular CFST column and ISSN PRINT 1392-8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA
Wang et al [15,16,17] investigated the seismic behavior of the blind bolted end plate structures between steel beams and square or circular CFST columns subjected to lateral low-cycle loading
Summary
Concrete-filled steel tube (CFST) has been widely used in civil engineering structures, because they have been proved to be inherently efficient in load carrying capacity, fire resistance, ductility and energy absorption capacity, and fast in construction according to the Ref. [1]. The different types of beam-to-column connections such as end plate and T-stub bolted connections were suggested to be used in steel frame structures, which could provide good seismic performance but could be repaired after a heavy earthquake. Wang et al [15,16,17] investigated the seismic behavior of the blind bolted end plate structures between steel beams and square or circular CFST columns subjected to lateral low-cycle loading. This paper will select two different types of connection of steel beam to CFST column connection with the penetrated high-strength bolts, including end plate (CJ-1) and T-stub bolted (CJ-2) connections, to investigate the seismic performance under cycle loading. The failure modes, bearing capacity, energy dissipation capacity and ductility and rigidity degeneration will be studied to show that the steel beam to CFST column connection with penetrated bolts and T-stub connection has good seismic capacity
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