Abstract
To avoid brittle fracture and plastic yielding of steel beam-to-column connections under earthquakes, a new beam-to-column connection of steel structures with all-steel buckling restrained braces (BRBs) is proposed. The all-steel BRB is connected to the steel beam and column members through pins to form a new connection system. Taking the T-shaped beam-to-column connection steel structure as the research object, two structural types with an all-steel BRB installed on one side (S-type) and two sides (D-type) are considered. Theoretical equations of the connection system’s initial stiffness and yield load are derived through the mechanical models. The yield load, main strain distribution, energy dissipation, and stiffness of the connection system are investigated through quasi-static tests to verify the connection system’s seismic performance. The tests revealed that the proposed new connection system is capable of achieving a stable hysteresis behavior. At the end of loading, the beam and column members are not damaged, and the plastic deformation is concentrated in the plastic energy dissipating replaceable BRB, and the beam and column basically remain elastic. The proposed equations approximately estimated the load response of the proposed connection system. The results show that the damage mode of this new connection system under seismic loading is BRB yielding, with an elastic response from the beam-column members.
Highlights
Earthquakes are a critical reason for structural damage and collapse, and the structural responses under seismic loads are complex and diverse (Li et al, 2016; Xie and Qu, 2016; Chen et al, 2021a; Chen et al, 2021b)
A buckling restrained braces (BRBs) is set on the right side of the beam. This structure is called S-type beam-to-column connection, which is suitable for the internal connection of a building (Figure 1A)
Points A and C indicate that the connection between BRB and the flange of the column is connected by pins
Summary
Earthquakes are a critical reason for structural damage and collapse, and the structural responses under seismic loads are complex and diverse (Li et al, 2016; Xie and Qu, 2016; Chen et al, 2021a; Chen et al, 2021b). Suita et al (2003); Chou et al (2004); Byakuno et al (2004); Terashima et al (2007) put forward a type of bolted beam to column connections with buckling restrained knee brace dampers and carried out a series of analyses and research on its mechanical properties. The dampers they chose use I-beam steel plates as the energy dissipation inner core, which has a simple structure, but its flexural stiffness is minor, so it is not the optimal structure form. The mechanical behavior of the whole connection system is theoretically evaluated, and a mathematical model is established to provide stiffness and yield load prediction
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