유사동적실험에 의한 프리캐스트 보강블럭벽 공법을 적용한 비내진상세를 가지는 실물 2층 R/C 골조의 내진성능 평가 = Seismic Capacity Evaluation of Full-size Two Story R/C Frames without Seismic Details Retrofitted by Precast Reinforced Block Walls

국문 초록 (Abstract)

이 연구는 기존의 내진 보강 방법의 단점을 보완하고 개선하는 새로운 개념인 프리캐스트 철근 블록 벽(PRBW)을 제안한다. PRBW 내진 보강 방법은 내진 보강 공사 중에도 거주자가 건물에 계속 거주할 수 있도록 하며, 보강으로 인한 건물 중량 증가를 최소화하고 우수한 접합 시공성을 제공한다. 특히, 전형적인 강도 증대 내진 보강 요구 사항이 있는 철근 콘크리트(R/C) 건물에 적합하며, 주로 전단 파괴에 지배되는 비내진 세부 사항을 갖는 기존 비내진 R/C 건물에 쉽게 적용 가능한 내진 보강 방법으로 활용될 수 있다. 기존의 비내진 R/C 건물을 기반으로 한 물리적 2층 R/C 프레임 실험체를 사용하여 외부에 부착된 PRBW 보강 시스템의 복원력, 강성 증대, 내진 응답 변위 제어 능력을 검증하기 위해 유사동적 실험을 수행하였다. 연구 결과, 한국의 설계 기준 지진(DBE) 수준인 200 cm/s²에서 비보강된 R/C 프레임은 전단 파괴를 경험한 반면, PRBW 내진 보강이 적용된 프레임은 경미한 내진 피해만을 입었다. 최대 고려 지진(MCE)인 300 cm/s²에서도 중등도의 내진 피해만 예상되었다. 본 연구는 새로 개발된 PRBW 내진 보강 방법의 효과를 성공적으로 입증하였다.

다국어 초록 (Multilingual Abstract)

This study proposes a new concept called Precast Reinforced Block Wall (PRBW), which improves and complements the drawbacks of existing strength enhancement seismic reinforcement methods. The PRBW seismic reinforcement method allows residents to continue residing in buildings while seismic reinforcement construction is underway. It minimizes the increase in building weight due to reinforcement and exhibits excellent joint constructability. Especially suitable for R/C buildings with typical strength-enhancing seismic reinforcement requirements, which typically exhibit non-seismic details dominated by shear failure, PRBW serves as an easily implementable seismic reinforcement method. Using a physical two-story R/C frame specimen based on existing non-seismic R/C buildings, pseudo-dynamic experiments were conducted to verify restorability, stiffness enhancement, and seismic response displacement control capability of the externally attached PRBW reinforcement system. The research findings indicated that under Korea’s Design Basis Earthquake (DBE) level of 200 cm/s², the unreinforced R/C frame experienced shear failure, while the frame reinforced with PRBW seismic reinforcement suffered minor seismic damage. Even under the maximum considered earthquake (MCE) of 300 cm/s², only moderate seismic damage was expected. This study successfully validated the effectiveness of the newly developed PRBW seismic reinforcement method.

참고문헌 (Reference)

• 1 Tokyo Soki Kenkyujo Company (TSKC), "Tokyo, Japan"
• 2 KS B 0801, "Test pieces for tension test for metallic materials" Korean Industrial Standards 2017
• 3 KS F 2405, "Test method for compressive strength of concrete"
• 4 KS F 2403, "Standard test method for making and curing concrete specimens"
• 5 Japan Building Disaster Prevention Association (JBDPA), "Standard for damage level classification" 450-, 2015
• 6 Lee K. S, "Seismic capacity requirements for low-rise reinforced concrete buildings controlled by both shear and flexure" 8 (8): 75-91, 2010
• 7 Seismic Strengthening Research Group (SSRG), "Seismic Strengthening of RC Buildings" Ohmsha Press 230-, 2008
• 8 이강석 ; 위정두 ; 김용인 ; 이현호, "Safety Evaluation of Korean R/C School Buildings Built in the 1980s" 13 (13): 1-11, 2009
• 9 Takanashi K., "Pseudo-dynamic tests on a 2-storey steel frame by a computer-load test apparatus hybrid system" 7 : 225-232, 1980
• 10 Maeda, M., "Post-Earthquake Damage Evaluation for R/C Buildings Based on Residual Seismic Capacity" 1179-, 2004
• 11 "MTS Pseudodynamic testing for 793 controllers"
• 12 Korean Design Standard 41 (KDS 41), "Korean design standard" Architectural Institute of Korea 2019
• 13 Hilber H. M., "Improved numerical dissipation for time integration algorithms in structural dynamics" 5 (5): 283-292, 1977
• 14 Japan Building Disaster Prevention Association (JBDPA), "Guideline for Seismic Strengthening of Existing Reinforced Concrete Buildings" 500-, 2017
• 15 Federal Emergency Management Agency (FEMA), "FEMA 356: Prestandard and Commentary for Seismic Rehabilitation of Buildings" 500-, 2000
• 16 정주성 ; 이강석, "A Seismic Capacity of R/C Building Damaged by the 2016 Gyeongju Earthquake Based on the Non-linear Dynamic Analysis" 22 (22): 137-146, 2018