1 Graduate Student, Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, USA, jmaoki@hawaii.edu
2 Professor, Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, USA, ianrob@hawaii.edu
3 Asst. Professor, Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, USA, gaur@hawaii.edu
ABSTRACT
Hybrid masonry consists of a combination of structural steel framing and reinforced concrete masonry unit shear panels to provide resistance to both gravity and lateral loads. A critical link in this system is the connection between the steel members and the masonry shear panels. Experiments were performed at the University of Hawaii at Manoa (UHM) to develop ductile fuse and rigid link plate connectors to transfer in-plane loads from the steel floor beams to the masonry shear panels.
During an earthquake, the ductile fuse connectors will yield prior to substantial damage to the masonry shear panels, thereby dissipating seismic energy in the replaceable links rather than damaging the steel frame or masonry shear panels. After the event, the fuse connectors can be replaced to restore the building to its original condition. In contrast, rigid link plate connectors are designed to remain elastic during seismic events. In-plane shear loads are transferred directly to the masonry shear panels which are designed to undergo inelastic cycling to dissipate energy and provide the necessary inelastic deformation without loss of lateral load capacity.
Integral to these fuse and link connectors are the thru-bolts that connect the plates to the masonry shear panel. Lack of design guidance for the capacity of these thru-bolts led to additional testing to characterize the capacity of thru-bolts in reinforced masonry walls. This paper presents results of the connector plate tests, with particular emphasis on the performance of the thru-bolted connection between the fuse or link plates and the masonry shear panel.
KEYWORDS: reinforced concrete masonry, earthquake, shear walls, structural steel frames, ductile fuses, thru-bolt connection
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