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Steel and Composite Structures Volume 37, Number 1, October10 2020 , pages 15-26 DOI: https://doi.org/10.12989/scs.2020.37.1.015 |
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Experimental study on seismic behavior of exterior composite beam-to-column joints with large size stiffened angles |
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Peng Wang, Zhan Wang, Jianrong Pan, Bin Li and Bo Wang
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| Abstract | ||
| The top-and-seat angles with double web angles are commonly used in the design of beam-to-column joints in Asian and North American countries. The seismic behavior analysis of these joints with large cross-section size of beam and column (often connected by four or more bolts) is a challenge due to the effects from the relatively larger size of stiffened angles and the composite action from the adjacent concrete slab. This paper presents an experimental investigation on the seismic performance of exterior composite beam-to-column joints with stiffened angles under cyclic loading. Four full-scale composite joints with different configuration (only one specimen contain top angle in concrete slab) were designed and tested. The joint specimens were designed by considering the effects of top angles, longitudinal reinforcement bars and arrangement of bolts. The behavior of the joints was carefully investigated, in terms of the failure modes, slippage, backbone curves, strength degradation, and energy dissipation abilities. It was found that the slippage between top-and-seat angles and beam flange, web angle and beam web led to a notable pinching effect, in addition, the ability of the energy dissipation was significantly reduced. The effect of anchored beams on the behavior of the joints was limited due to premature failure in concrete, the concrete slab that closes to the column flange and upper flange of beam plays an significant role when the joint subjected to the sagging moment. It is demonstrated that the ductility of the joints was significantly improved by the staggered bolts and welded longitudinal reinforcement bars. | ||
| Key Words | ||
| composite joints; beam-to-column connection; top and seat angles; seismic behavior | ||
| Address | ||
| Peng Wang: School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; School of Civil Engineering and Transportation, Guangdong University of Technology, Guangzhou 510006, China Zhan Wang and Jianrong Pan: School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China Bin Li and Bo Wang: School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China | ||