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http://dx.doi.org/10.5000/EESK.2022.26.1.031

Strength Demand Calculation for Retrofitting Unreinforced Masonry Buildings Based on the Displacement Coefficient Method and the Preliminary Seismic Evaluation Procedure  

Seol, Yun Jeong (CGS Plan)
Park, Ji-Hun (Division of Architecture and Urban Design, Incheon National University)
Kwak, Byeong Hun (Department of Architecture, Incheon National University)
Kim, Dae Ho (Hanwool)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.26, no.1, 2022 , pp. 31-38 More about this Journal
Abstract
Based on the nonlinear static analysis and the approximate seismic evaluation method adopted in "Guidelines for seismic performance evaluation for existing buildings, two methods to calculate strength demand for retrofitting individual structural walls in unreinforced masonry buildings are proposed." The displacement coefficient method to determine displacement demand from nonlinear static analysis results is used for the inverse calculation of overall strength demand required to reduce the displacement demand to a target value meeting the performance objective of the unreinforced masonry building to retrofit. A preliminary seismic evaluation method to screen out vulnerable buildings, of which detailed evaluation is necessary, is utilized to calculate overall strength demand without structural analysis based on the difference between the seismic demand and capacity. A system modification factor is introduced to the preliminary seismic evaluation method to reduce the strength demand considering inelastic deformation. The overall strength demand is distributed to the structural walls to retrofit based on the wall stiffness, including the remaining walls or otherwise. Four detached residential houses are modeled and analyzed using the nonlinear static and preliminary evaluation procedures to examine the proposed method.
Keywords
Unreinforced masonry buildings; Seismic retrofit; Displacement coefficient method; Nonlinear static analysis; Preliminary seismic performance evaluation;
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