비선형 유한요소 해석에 의한 강봉 트러스 시스템으로 보강된 조적벽체의 내진거동 평가
Evaluation of Seismic Response of Masonry Walls Strengthened with Steel-bar Truss Systems by Non-linear Finite Element Analysis
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초록
이 연구에서는 강봉 트러스 시스템으로 보강된 조적벽체의 내진거동을 합리적으로 평가하기 위하여 범용프로그램인 Abaqus를 이용한 비선형 유한요소해석 절차를 제시하였다. 조적벽체의 유한요소 모델은 콘크리트 손상 소성(concrete damaged plasticity, CDP)모델 및 벽돌-모르타르 계면 특성은 Yang et al.이 제시한 조적 프리즘의 압축 및 인장의 응력-변형률 모델과 전단마찰모델을 기반으로 메소-스케일법을적용하였다. 유한요소 해석결과를 다양한 변수조건에서 실험결과와 비교한 결과, 강봉 트러스 시스템으로 보강된 조적벽체의 균열진전, 파괴모드, 강체회전 내력 및 최대내력 그리고 횡하중-횡변위 관계에 대한 실험결과와 잘 일치하였다. 따라서 제시된 유한요소해석 절차는 조적벽체의 내진보강 설계에 합리적으로 이용될 수 있다고 판단된다.
Abstract
The present study presents a nonlinear finite element analysis (FEA) approach using the general program of Abaqus to evaluate the seismicresponse of unreinforced masonry walls strengthened with the steel bar truss system developed in the previous investigation. For finite element modelsof masonry walls, the concrete damaged plasticity (CDP) and meso-scale methods were considered on the basis of the stress-strain relationships undercompression and tension and shear friction-slip relationship of masonry prisms proposed by Yang et al. in order to formulate the interface characteristicsbetween brick elements and mortars. The predictions obtained from the FEA approach were compared with test results under different designparameters; as a result, a good agreement could be observed with respect to the crack propagation, failure mode, rocking strength, peak strength, andlateral load-displacement relationship of masonry walls. Thus, it can be stated that the proposed FEA approach shows a good potential for designingthe seismic strengthening of masonry walls.
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