Abstract
This paper proposes a site-bolted connection that is suitable for modularized prefabricated steel structures. Excellent ductility is achieved by various structural measures. Six connection specimens with different parameters were subjected to quasi-static loading tests and finite element analysis (FEA) to determine the seismic performance of the proposed connection (e.g., hysteretic behavior, skeleton curve, ductility, and failure mode). The results of the tests and FEA showed that the connection underwent sufficient plastic deformation under cyclic loading and that its ultimate rotation angle could reach 0.09 rad. A clear plastic hinge formed on the beam before the connection failed, which suggests a ductile failure mode. The connection exhibited a wide hysteresis loop, which indicated good seismic performance. The results also showed that the connection does not slip under small earthquakes and could dissipate energy through slippage in the connection region under a moderate earthquake and through slippage in the connection region as well as plastic deformation at the beam end under a severe earthquake. The number of bolts was the main parameter that affected the seismic performance of the connection. The test and FEA results demonstrated that all six specimens had excellent seismic and ductile performance and an exceptional plastic rotation capacity.
Highlights
Before the 1990s, welded and bolted-welded connections were used extensively due to their high load-bearing capacity, stiffness, and cost-effectiveness
Liu et al proposed several new truss-square HSS column connections that are suitable for modularized high-rise steel structures, a fully welded connection [24] used in a module, a bolted-welded connection [25], and some fully bolted connections [26,27,28,29] used for connecting different modules, and determined the seismic performance of the proposed connections from static and quasi-static loading tests and finite element analysis (FEA)
The FEA results for specimen M1A show that after loading, a plastic hinge formed at the beam end in the joint region, the web bulged, and only the bolt holes in the upper row were significantly elongated
Summary
Before the 1990s, welded and bolted-welded connections were used extensively due to their high load-bearing capacity, stiffness, and cost-effectiveness. Liu et al proposed several new truss-square HSS column connections that are suitable for modularized high-rise steel structures, a fully welded connection [24] used in a module, a bolted-welded connection [25], and some fully bolted connections [26,27,28,29] used for connecting different modules, and determined the seismic performance of the proposed connections from static and quasi-static loading tests and FEA They [30] designed and studied a modularized prefabricated steel frame structure with inclined braces in which the beam to column and column to column connections are made by bolts on-site. Six specimens were subjected to lowcyclic loading tests and FEA to study the seismic performance (hysteretic behavior, skeleton curve, ductility, rotation capacity, and stiffness degradation) of the connection and determine the key parameters that affect it
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