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http://dx.doi.org/10.12989/scs.2020.35.3.305

Numerical study of the seismic behavior of steel frame-tube structures with bolted web-connected replaceable shear links  

Lian, Ming (School of Civil Engineering, Xi'an University of Architecture & Technology)
Cheng, Qianqian (School of Civil Engineering, Xi'an University of Architecture & Technology)
Zhang, Hao (School of Civil Engineering, Xi'an University of Architecture & Technology)
Su, Mingzhou (School of Civil Engineering, Xi'an University of Architecture & Technology)
Publication Information
Steel and Composite Structures / v.35, no.3, 2020 , pp. 305-325 More about this Journal
Abstract
Beams of steel frame-tube structures (SFTSs) typically have span-to-depth ratios of less than five. This makes a flexural beam unsuitable for such an application because the plastic hinges at the beam-ends cannot be adequately developed. This leads to lower ductility and energy dissipation capacities of SFTSs. To address this, SFTSs with bolted web-connected replaceable shear links (SFTS-BWSLs) are proposed. In this structural system, a web-connected replaceable shear link with a back-to-back double channel section is placed at the mid-length of the deep beam to act as a ductile fuse. This allows energy from earthquakes to be dissipated through link shear deformation. SFTS and SFTS-BWSL buildings were examined in this study. Several sub-structures were selected from each designed building and finite element models were established to study their respective hysteretic performance. The seismic behavior of each designed building was observed through static and dynamic analyses. The results indicate that the SFTS-BWSL and SFTS have similar initial lateral stiffness and shear leg properties. The SFTS-BWSL had lower strength, but higher ductility and energy dissipation capacities. Compared to the SFTS, the SFTS-BWSL had lower interstory drift, base shear force, and story shear force during earthquakes. This design approach could concentrate plasticity on the shear link while maintaining the residual interstory drift at less than 0.5%. The SFTS-BWSL is a reliable resistant system that can be repaired by replacing shear links damaged due to earthquakes.
Keywords
steel frame-tube structure; web-connected replaceable shear link; hysteretic behaviors; dynamic behaviors; finite element analyses;
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