Abstract
To investigate the seismic behavior of end-plate connection semi-rigid space steel frames, three 1/4-scale specimens were tested under cyclic load. Finite element analysis which took initial geometric imperfections into consideration was also conducted, and the results conform to experimental results. The failure modes, hysteretic behavior, deformation capacity and energy-dissipation capacity of the end-plate connection semi-rigid space steel frame have been explicated in this paper. The investigation in this paper indicates that: (1) the end-plate connection semi-rigid space steel frames exhibit full hysteretic loops under horizontal cyclic load and have good ductility as well, indicating that this kind of frames can satisfy the deformation demand in strong earthquakes. (2) Plastic hinges formed at beam ends, and the stress and deformation amplitudes of joint-panels were smaller than those of column base and beam ends. It shows that this kind of frames satisfy the design principle “strong column weak beam, strong joint weak component”.
Highlights
Widespread and unanticipated failures in welded steel beam-column connections were observed in both the 1994 Northridge Earthquake and the 1995 Hyogoken-Nanbu Earthquake [1,2,3]
This paper presents experimental study on the seismic behavior of semi-rigid space steel frames with end plate connections
The seismic behavior of three semi-rigid steel space frames using end-plate connections was investigated by frame tests and FEM analysis
Summary
Widespread and unanticipated failures in welded steel beam-column connections were observed in both the 1994 Northridge Earthquake and the 1995 Hyogoken-Nanbu Earthquake [1,2,3]. The seismic behavior of semi-rigid connections, which exhibit better ductility than welded connections, has been widely studied since the Northridge Earthquake. The seismic behavior of semi-rigid steel frames has not yet been systematically studied. It is expected that studies and analysis on the dynamic behavior of semi-rigid steel frames will further promote the application of this kind of structures in seismic regions. The studies on the seismic behavior of semi-rigid steel frames under cyclic loading will be of high value, which correspond with the requirement of the development trend of steel structure. This paper presents experimental study on the seismic behavior of semi-rigid space steel frames with end plate connections. Stiffeners were set around both the column flange and web to increase the flexural rigidity, as shown in Fig.
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