209 Journal of Asian Architecture and Building Engineering/January 2014/215 Deformation Capacity and Performance-Based Seismic Design for Reinforced Concrete Shear Walls Ying Zhou* 1 , Dan Zhang 2 , Zhihua Huang 3 and Dan Li 4 1 Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, P.R. China 2 Doctoral Candidate, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, P.R. China 3 Doctor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, P.R. China 4 Master Student, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, P.R. China Abstract Deformation capacity of reinforced concrete (RC) shear walls is mainly influenced by concrete confinement at the boundaries of shear walls, axial force ratio and wall aspect ratio. In this paper, the relationship among the wall boundary transverse reinforcement characteristic value λ vw , the axial force ratio n, the wall aspect ratio r and the ultimate displacement ∆ uw is established first. Then, the relationship between λ vw − n − r − ∆ uw is verified against the results of 71 RC shear wall experiments conducted by eight different research institutions. Based on the established relationship, the performance-based seismic design (PBSD) method for RC shear walls is proposed. According to the method presented in the paper, the amount of transverse reinforcement at wall boundaries could be determined, if the inter-storey drift demand θ and the damage index D w are predetermined. The use of the proposed PBSD method, which may guide future RC shear wall design, is illustrated in detail by an example. Keywords: RC shear wall; deformation capacity; performance-based seismic design 1. Introduction Reinforced concrete shear walls are one of the most critical structural elements of mid-rise and high-rise structures, as they typically serve to resist the majority of lateral seismic loads. The deformation capacity of RC shear walls, measured by the ultimate deformation Δ uw , significantly influences the seismic behavior of the entire structure. Therefore, investigation of the relationship between deformation capacity and other related parameters of RC shear walls is of major importance to performance-based seismic design for RC shear walls. There are various factors that influence the deformation capacity of RC shear walls including boundary confinements, axial force ratio, wall aspect ratio (sometimes represented as shear span ratio), etc. Boundary confinement is one of the dominating parameters controlling the damage mode and deformation capacity of RC shear walls. Experiments indicate that the strain capacity of boundary concrete could be increased by enhancing the constraint level of the boundary element (usually quantified as the wall- boundary transverse reinforcement characteristic value λ vw ), which as a result improves the wall deformation ductility. The axial force ratio n is another fundamental parameter that influences the failure mode and deformation capacity of RC shear walls as it directly changes the relative compression depth of the cross section of the wall. The wall aspect ratio r is a crucial parameter among those that influence the failure mode of the structure. It is verified experimentally that flexural failure usually occurs when wall aspect ratio r is greater than 2; flexural-shear failure happens when r is between 1 and 2; and shear failure predominates when r is less than 1. The deformation capacity design of RC shear walls seeks to establish a relationship between deformation and deformation-affecting factors. In this paper, the λ vw − n − r − ∆ uw relationship is set up so that the PBSD of RC shear walls can be realized by calculating the transverse reinforcement at the boundaries in light of the anticipated deformation demands. 2. λ vw − n − r − ∆ uw Relationship for RC Shear Walls It was proposed by Mander et al . (1988) and summarized by Paulay and Priestly (1992) that the *Contact Author: Ying Zhou, Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P.R. China Tel: +86-21-6598-6157 Fax: +86-21-6598-2668 E-mail: [email protected] ( Received April 10, 2013 ; accepted November 11, 2013 )
Deformation Capacity and Performance-Based Seismic Design for Reinforced Concrete Shear Walls
May 19, 2023
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