Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Strength Demand Calculation for Retrofitting Unreinforced Masonry Buildings Based on the Displacement Coefficient Method and the Preliminary Seismic Evaluation Procedure

변위계수법 및 약산식 내진성능평가에 기초한 비보강 조적조 건물의 내진보강 요구강도 산정

  • 설윤정 ((주)씨지스플랜) ;
  • 박지훈 (인천대학교 도시건축학부) ;
  • 곽병훈 (인천대학교 일반대학원 건축학과) ;
  • 김대호 ((주)한울구조안전기술사사무소)
  • Received : 2021.10.01
  • Accepted : 2021.11.25
  • Published : 2022.01.01
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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

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 21CTAP-C152105-03)

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