Analytical Study on the Amount of Reinforcement in the DIY Shear Reinforcement Method using High-performance Composite Fiber Panels of Low-rise Piloti Columns
본 연구에서는 Aramid FRP와 모서리보강재로 구속한 엔지니어링플라스틱 보강을 통해 기둥의 횡구속 능력을 증대하여 콘크리트 피복 및 압괴 파괴를 지연시킴으로써 휨 항복 후 연성거동을 유도하여 기존 저층 필로티 건축물의 내진 성능을 확보하는 방법을 제시하고 저층 필로티 건축물의 내진취약요인을 분석하여 필요한 전단보강량을 산정, 제안공법의 목표전단보강을 설정하는 것을 목적으로 한다. 엔지니어링플라스틱을 활용한 기둥의 전단보강형상을 제안하고 필로티 구조의 내진취약요인 보강임계점 예측과 예제모델의 구조해석을 통해 제안공법의 목표전단보강량을 검증하였다. 구조해석 결과, 특별지진하중 적용 시, 휨-축력 내력 초과비율이 타 유형군에 비해 낮은 ST-A1(1축편심)을 기준으로 연면적 750m² 이하와 1축 편심 중심-강심편심율 18%이하에 해당될 경우에는 본 논문에서 제안하는 ‘고성능 복합섬유 패널 전단 보강법’을 적용할 수 있는 경계로 제한하고자 한다.
In this study, ductile behavior is induced after flexural yielding to secure the seismic performance of existing low-rise piloti buildings by increasing the lateral restraint capacity of columns through reinforcement of engineering plastics restrained with Aramid FRP and corner reinforcement and delaying concrete cover and crushing failure. The purpose of this study is to present a method and set the target shear reinforcement for the proposed construction method by estimating the amount of required shear reinforcement by analyzing the earthquake-resistant factors of low-rise piloti buildings. Furthermore, the shear reinforcement shape of the column was proposed using engineering plastics, and the target shear reinforcement amount of the proposed method was verified by predicting the critical reinforcement point, which is the earthquake-resistant weak factor of the piloti structure, and the structural analysis of the example model. As a result of structural analysis, the total floor area is less than 750m² and the uniaxial eccentricity center-rigid eccentricity ratio is 18% when a special seismic load is applied, based on ST-A1 (one-axis eccentricity), which has a lower bending-axial load capacity excess ratio compared with other types. The “high-performance composite fiber panel shear reinforcement method” proposed in this paper is limited to the applicable boundary in the following cases.