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Comparison of Solid and Perforated Hybrid Precast Concrete Shear Walls for Seismic Regions
This paper compares the measured lateral load behaviors of two 0.4-scale "hybrid" precast concrete wall test specimens - one wall with solid panels and the other with perforated panels. The test specimens have the same overall geometry and utilize a combination of mild [i.e., Grade 400 (U.S. Grade 60)] steel and high-strength unbonded post-tensioning (PT) steel for lateral resistance across horizontal joints. The mild steel reinforcement is designed to yield in tension and compression, providing energy dissipation. The unbonded PT steel provides self-centering capability, reducing the residual lateral displacements of the wall after a large earthquake. The comparisons between the two walls focus on the applied lateral load versus displacement behavior, energy dissipation, shear deformations, and behavior along the critical horizontal base-panel-to-foundation joint. Both specimens demonstrated excellent re-centering and energy dissipation capabilities as well as ductile behavior over lateral displacements at or greater than the ACI ITG-5.1 (2007) requirement. The perforated specimen was able to achieve greater lateral drift due to improvements made to the details of the panel reinforcement at the wall toes. Ultimately, these results are expected to support the successful code approval of hybrid precast shear walls for moderate and high seismic regions of the United States.
Comparison of Solid and Perforated Hybrid Precast Concrete Shear Walls for Seismic Regions
This paper compares the measured lateral load behaviors of two 0.4-scale "hybrid" precast concrete wall test specimens - one wall with solid panels and the other with perforated panels. The test specimens have the same overall geometry and utilize a combination of mild [i.e., Grade 400 (U.S. Grade 60)] steel and high-strength unbonded post-tensioning (PT) steel for lateral resistance across horizontal joints. The mild steel reinforcement is designed to yield in tension and compression, providing energy dissipation. The unbonded PT steel provides self-centering capability, reducing the residual lateral displacements of the wall after a large earthquake. The comparisons between the two walls focus on the applied lateral load versus displacement behavior, energy dissipation, shear deformations, and behavior along the critical horizontal base-panel-to-foundation joint. Both specimens demonstrated excellent re-centering and energy dissipation capabilities as well as ductile behavior over lateral displacements at or greater than the ACI ITG-5.1 (2007) requirement. The perforated specimen was able to achieve greater lateral drift due to improvements made to the details of the panel reinforcement at the wall toes. Ultimately, these results are expected to support the successful code approval of hybrid precast shear walls for moderate and high seismic regions of the United States.
Comparison of Solid and Perforated Hybrid Precast Concrete Shear Walls for Seismic Regions
Smith, B. J. (author) / Kurama, Y. C. (author) / McGinnis, M. J. (author)
Structures Congress 2012 ; 2012 ; Chicago, Illinois, United States
Structures Congress 2012 ; 1529-1540
2012-03-29
Conference paper
Electronic Resource
English
Comparison of Solid and Perforated Hybrid Precast Concrete Shear Walls for Seismic Regions
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