유사동적실험기반 내부접합형 합성내진보강공법을 적용한 기존 R/C 건물의 내진성능평가
Seismic Capacity Evaluation of Existing R/C Buildings Retrofitted by Internal Composite Seismic Strengthening Method Based on Pseudo-dynamic Testing
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초록
본 연구에서는 기존 내력증진형 내진보강공법의 취약점을 개선 및 보완할 수 있는 새로운 개념의 내진보강법인 내부접합형 합성내진보강공법 (Composite Seismic Strengthening Method, CSSM)을 제안하였다. CSSM 내진보강 시스템은 필요 내진보강량 산정이 간편한 강도증진형 내진보강법의 일종으로서, 전단파괴가 지배적인 우리나라 내진상세를 가지지 않는 기존 R/C 건물에 적용 시 내력증가가 효율적으로 가능한 내진시스템 공법이다. 제안한 내부접합형 CSSM 공법의 내진안전성을 검토하기 위하여 내진상세를 가지지 않는 우리나라 R/C 건축물을 바탕으로 한 실물 2층 골조 실험체를 대상으로 유사동적실험을 실시하여, 지진에 대한 하중 및 변위 특성, 지진피해수준, 강도증진 효과, 변위제어능력을 중심으로 내진성능을 평가하였다. 유사동적 실험결과 개발공법인 CSSM 내진시스템은 효과적으로 전단내력을 증가시켰으며, 2400년 재현주기인 지진파에 대해서도 지진에 대한 변위를 효과적으로 억제시켰다.
Abstract
In this study, in order to enhance the joint capacity between the existing reinforced concrete (R/C) frame and the reinforcement member,we proposed a novel concept of Internal Composite Seismic Strengthening Method (CSSM) for seismic retrofit of existing domestic medium-to-low-riseR/C buildings. The Internal CSSM rehabilitation system is a type of strength-enhancing reinforcement systems, to easily increase the ultimate horizontalshear capacity of R/C structures without seismic details in Korea, which show shear collapse mechanism. Two test specimens of full-size two-story R/Cframe were fabricated based on an existing domestic R/C building without seismic details, and then retrofitted by using the proposed CSSM seismicsystem; therefore, one control test specimen and one test specimen reinforced with the CSSM system were used. Pseudo-dynamic testing was carriedout to evaluate seismic strengthening effects, and the seismic response characteristics of the proposed system, in terms of the maximum shear force,response story drift, and seismic damage degree compared with the control specimen (R/C bare frame). Experiment results indicated that the proposedCSSM reinforcement system, internally installed to the existing R/C frame, effectively enhanced the horizontal shear force, resulting in reduced storydrift of R/C buildings even under a massive earthquake.
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