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지진시 재료 비선형효과를 고려한 TMD가 설치된 콘크리트 구조물의 진동제어
모터라만 ( Md Motiur Rahman ),타미나나하르 ( Tahmina Tasnim Nahar ),장성규 ( Sungkyu Chang ),김두기 ( Dookie Kim ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
This paper concern the performance of tuned mass damper (TMD) and dynamic behaviour of TMD controlled structure considering constitutive material model. A three-storied reinforced concrete frame is modelled using OpenSees for this study. Considering the non-linear materials model, the performance of the TMD not only rely on the mass, stiffness and damping of the system but also on the parameter to be controlled by TMD and the input ground motion types. For this reason in this study some practical, sine sweep and damped sine sweep are considered as input excitation to the evaluate exact dynamic behaviour of TMD controlled structure.
지진구역 내 손상단계를 고려한 콘크리트 중력댐의 파괴 위험 분석
타미나나하르 ( Tahmina Tasnim Nahar ),김두기 ( Dookie Kim ),모터라만 ( Md Motiur Rahman ),장성규 ( Sungkyu Chang ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
Failure risk investigation of any structure in a seismic zone can be done by the seismic probabilistic risk assessment (SPRA), which became a very attractive area of research in terms of safety measurement. This paper introduces such kind of concept to identify which magnitude in a specific seismic zone will contribute more vulnerable failure point in a structure. Here, for implement this idea a case study on a concrete gravity dam has been carried out. In order to make a correlation between the magnitude and failure risk contribution based on different damage stage, a combination of seismic hazard analysis and the probability of structural collapse is adopted. Therefore, the deaggregation of the mean annual frequency of failure risk by magnitude is used in this study to quantify four different limit stages of failure identification criteria. Consequently, from analyzing the result, in case of concrete gravity dam, this deaggregation approach shows the tensile crack in the base looks more vulnerable damage stage for the specific seismic zone.
Seismic Response Characterization of Shear Wall in Auxiliary Building of Nuclear Power Plant
모터 라만,타미나 나하르,백건휘,김두기,Rahman, Md Motiur,Nahar, Tahmina Tasnim,Baek, Geonhwi,Kim, Dookie Earthquake Engineering Society of Korea 2021 한국지진공학회논문집 Vol.25 No.3
The dynamic characterization of a three-story auxiliary building in a nuclear power plant (NPP) constructed with a monolithic reinforced concrete shear wall is investigated in this study. The shear wall is subjected to a joint-research, round-robin analysis organized by the Korea Atomic Energy Research Institute, South Korea, to predict seismic responses of that auxiliary building in NPP through a shake table test. Five different intensity measures of the base excitation are applied to the shaking table test to get the acceleration responses from the different building locations for one horizontal direction (front-back). Simultaneously to understand the global damage scenario of the structure, a frequency search test is conducted after each excitation. The primary motivation of this study is to develop a nonlinear numerical model considering the multi-layered shell element and compare it with the test result to validate through the modal parameter identification and floor responses. In addition, the acceleration amplification factor is evaluated to judge the dynamic behavior of the shear wall with the existing standard, thus providing theoretical support for engineering practice.