A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design of Hybrid Precast Concrete Walls for Seismic Regions
This paper presents an ongoing research project on the behavior and design of "hybrid" precast concrete wall structures for use in seismic regions. Hybrid precast walls utilize a combination of mild (e.g., Grade 60) steel and high-strength unbonded post-tensioning (PT) steel for flexural 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 (i.e., permanent) lateral displacements of the wall from a large earthquake. Both the PT steel and the mild steel contribute to the wall lateral strength, resulting in an efficient structure. The paper introduces a seismic design approach that conforms to ACI 318 (2008) and ACI ITG-5.2 (2008) for the validation of hybrid walls as special reinforced concrete shear walls based on ACI ITG-5.1 (2008). This design approach is used to design a series of test specimens investigating the following parameters: (1) relative amounts of mild steel and PT steel; (2) wall height-to-length aspect ratio; (3) concrete confinement details; and (4) presence of openings within the wall panels. A pre-test study is conducted to evaluate the design of the test specimens based on nonlinear reversed-cyclic lateral load analyses. It is shown that the specimens satisfy all of the validation and design prerequisites set forth in ACI ITG-5.1 and ACI ITG-5.2. The subsequent testing of these specimens is expected to ultimately support the code approval of the hybrid wall system for moderate and high seismic regions.
Design of Hybrid Precast Concrete Walls for Seismic Regions
This paper presents an ongoing research project on the behavior and design of "hybrid" precast concrete wall structures for use in seismic regions. Hybrid precast walls utilize a combination of mild (e.g., Grade 60) steel and high-strength unbonded post-tensioning (PT) steel for flexural 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 (i.e., permanent) lateral displacements of the wall from a large earthquake. Both the PT steel and the mild steel contribute to the wall lateral strength, resulting in an efficient structure. The paper introduces a seismic design approach that conforms to ACI 318 (2008) and ACI ITG-5.2 (2008) for the validation of hybrid walls as special reinforced concrete shear walls based on ACI ITG-5.1 (2008). This design approach is used to design a series of test specimens investigating the following parameters: (1) relative amounts of mild steel and PT steel; (2) wall height-to-length aspect ratio; (3) concrete confinement details; and (4) presence of openings within the wall panels. A pre-test study is conducted to evaluate the design of the test specimens based on nonlinear reversed-cyclic lateral load analyses. It is shown that the specimens satisfy all of the validation and design prerequisites set forth in ACI ITG-5.1 and ACI ITG-5.2. The subsequent testing of these specimens is expected to ultimately support the code approval of the hybrid wall system for moderate and high seismic regions.
Design of Hybrid Precast Concrete Walls for Seismic Regions
Smith, Brian J. (author) / Kurama, Yahya C. (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-10
2009-04-29
Conference paper
Electronic Resource
English
Design of Hybrid Precast Concrete Walls for Seismic Regions
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