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축력 및 전단력을 받는 비보강 조적벽체의 비선형 유한요소 해석
강우주(Kang Woo-Joo),서대원(Seo Dae-Won),장극관(Chang Kug-Kwan) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Unreinforced masonry shear walls are often used as the main structural component of masonry buildings responsible for carrying the lateral loads. The lateral and vertical loads lead to tension and shear combined with compression within the masonry wall. Fracture and failure of masonry walls under shear compression is intricate because of the complex interaction of shear failure along the mortar joints and compression failure often at the toe of the wall. This study covers the modeling and the analysis of unreinforced masonry walls under shear-compression failure. In this study, a simplified micro modeling approach is used wherein the two masonry components: bricks and motar joints are modeled separately. The motar joint, which is the plane of weakness, is represented through interface nodes of zero thickness. The analytical model of Drucker-Prager yield criterion which is a smooth approximation of the Mohr-Coulomb theory is used to model the nonlinear behavior of masonry walls. The analytical results are verified by comparing the experimental results on a masonry wall under lateral loading. The comparison shows a good agreement between the developed FEM model and the experimental test results. Also, the developed FEM model can predict the cracking pattern of unreinforced masonry shear wall under shear and compression.
손상평가 기법을 이용한 Hi-Form 접합부의 강성평가
장극관 ( Chang Kug-kwan ),천영수 ( Chun Young-soo ),강우주 ( Kang Woo-joo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This paper provides the results from evaluating the stiffness of Hi-form junction by an experiment and the system identification method using the dynamic modal data, and the reasonable modeling method of Hi-Form junction which is proposed for improved stair construction recently. Based on the crack pattern and load-displacement relationship and the damage distribution, it can be judged that Hi-form junction can't fullly transfer the forces between the elements linked, and we propose that the junction is modeled as a element which have a stiffness with 50% decrease.