Journal
JOURNAL OF STRUCTURAL ENGINEERING
Volume 139, Issue 11, Pages 1917-1927Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)ST.1943-541X.0000755
Keywords
Concrete; Post tensioning; Precast concrete; Reinforced concrete; Bars; Tests; Seismic effects; Shear walls; Comparative studies; Post-tensioned concrete; Precast concrete; Reinforced concrete; Spliced bars; Seismic tests; Emulative walls; Hybrid walls; Shear walls
Funding
- Charles Pankow Foundation
- Precast/Prestressed Concrete Institute (PCI)
- High Concrete Group, LLC
- Consulting Engineers Group, Inc.
- University of Notre Dame
- PCI Research and Development Committee
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This paper discusses the lateral load behavior of two, 0.40-scale, hybrid, precast concrete shear wall test specimens and the behavior of a third precast specimen designed to emulate monolithic cast-in-place RC shear walls. The walls had identical overall geometry and were constructed by placing rectangular precast panels across horizontal joints. The hybrid walls used mild steel bars [Grade 400 (U.S. Grade 60)] and high-strength unbonded posttensioning (PT) strands for lateral resistance, whereas the emulative wall used only mild steel bars. The mild steel bars crossing the base joint were designed to yield and provide energy dissipation, with the PT steel in the hybrid walls reducing the residual displacements of the structure. The mild steel bars at the base of the emulative wall and one of the hybrid walls used Type II mechanical splices, while the other hybrid wall used continuous bars grouted into the foundation. Because of the lack of PT steel, the emulative wall developed a large residual uplift at the base joint, resulting in excessive horizontal slip and strength degradation. The behavior of the hybrid wall with Type II splices was also limited, which occurred because of the pullout of the mild steel bars. In contrast, the hybrid wall with continuous mild steel bars showed superior restoring, energy dissipation, and ductile behavior over larger lateral displacements. The results show the potential for the use of precast walls in seismic regions, while also revealing important detailing considerations.
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