TY - JOUR
T1 - Cyclic flexural analysis and behavior of beam-column connections with gusset plates
AU - Stoakes, Christopher D.
AU - Fahnestock, Larry A.
N1 - Funding Information:
Partial funding for this research was provided by the American Institute of Steel Construction . The computational simulations described herein were partially conducted using an allocation through the TeraGrid Advanced Support Program. All opinions, findings, and conclusions expressed are those of the authors.
PY - 2012/5
Y1 - 2012/5
N2 - This research investigates the cyclic flexural behavior of double-angle concentrically braced frame beam-column connections using three-dimensional nonlinear finite element analysis. Prior experimental research demonstrated that such connections possess appreciable flexural stiffness, strength, and ductility. The reserve capacity provided by these connections plays a significant role in the seismic behavior of low-ductility concentrically braced frames, so knowledge about the impact of connection parameters on local limit states and global connection performance is needed for employing reserve capacity to design and assess concentrically braced frames. Finite element models were developed and validated against prior experiments with focus on the limit states of failure of the fillet weld between the gusset plate and beam, low-cycle fatigue fracture of the steel angles joining the beam and gusset plate to the column, and bolt fracture. The models were used to evaluate the flexural stiffness, strength, and ductility of braced frame connections with primary attention on the effects of beam depth, angle thickness, and a supplemental seat angle. The finite element analysis demonstrated that increasing beam depth and angle thickness and adding a supplemental seat angle all increased the stiffness and strength of the connection while maintaining deformation capacity. A procedure to estimate the flexural behavior of beam-column connections with gusset plates was developed based on the results of the numerical simulations.
AB - This research investigates the cyclic flexural behavior of double-angle concentrically braced frame beam-column connections using three-dimensional nonlinear finite element analysis. Prior experimental research demonstrated that such connections possess appreciable flexural stiffness, strength, and ductility. The reserve capacity provided by these connections plays a significant role in the seismic behavior of low-ductility concentrically braced frames, so knowledge about the impact of connection parameters on local limit states and global connection performance is needed for employing reserve capacity to design and assess concentrically braced frames. Finite element models were developed and validated against prior experiments with focus on the limit states of failure of the fillet weld between the gusset plate and beam, low-cycle fatigue fracture of the steel angles joining the beam and gusset plate to the column, and bolt fracture. The models were used to evaluate the flexural stiffness, strength, and ductility of braced frame connections with primary attention on the effects of beam depth, angle thickness, and a supplemental seat angle. The finite element analysis demonstrated that increasing beam depth and angle thickness and adding a supplemental seat angle all increased the stiffness and strength of the connection while maintaining deformation capacity. A procedure to estimate the flexural behavior of beam-column connections with gusset plates was developed based on the results of the numerical simulations.
KW - Braced frames
KW - Connections
KW - Earthquake resistant structures
KW - Moment rotation behavior
KW - Reserve capacity
KW - Steel framed buildings
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U2 - 10.1016/j.jcsr.2011.12.008
DO - 10.1016/j.jcsr.2011.12.008
M3 - Article
AN - SCOPUS:84858446809
SN - 0143-974X
VL - 72
SP - 227
EP - 239
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
ER -