• Earthquakes and Structures
• /
• 제9권4호
• /
• pp.735-752
• /
• 2015

The effectiveness of seismic retrofitting of RC-frame buildings by converting selected bays into new walls through infilling with RC walls was studied experimentally using a full-scale four-storey model tested with the pseudo-dynamic (PsD) method. The frames were designed and detailed for gravity loads only using different connection details between the walls and the bounding frame. In order to simulate the experimental response, two numerical models were formulated differing at the level of modelling. The purpose of this paper is to illustrate the capabilities of these models to simulate the experimental nonlinear behaviour of the tested RC building strengthened with RC infill walls and comment on their effectiveness. The comparison between the capacity, in terms of peak ground acceleration, of the strengthened frame and the one of the bare frame, which was obtained numerically, has shown a five-fold increase.

• 한국생산제조학회지
• /
• 제9권3호
• /
• pp.130-135
• /
• 2000

In this study the vibration behavior of the stiffened double cylinder was experimently analyzed. Due to the complex structure of the double cylinder the outside cylinder frequency responses to the exciting forces applied on various posi-tions were analyzed by using spectrum analyzer in conjunction with an accelerometer and the natural frequencies were obtained. The technique of time-averaged holographic interferometry is applied to study the vibration characteristics of outside cylinder with stiffening T frame. The experimental data showed that the T frame had salient effect of damping on the testing structure at most of resonances. however the experimental results also revealed interesting phenomenon. At some particular frequencies the T frame. The experimental data showed that the T frame had salient effect of damping on the testing structure at most of resonances. However the experimental results also revealed interesting phenomenon. At some particular frequencies the T frame seemed to behave as a transmitter. In addition it has been successfully demon-started that optical method such as holographic interferometry is well suited for the identification of mode shapes. They can give us a whole-field non-contact measurement instead of the point-wise measurement by accelerometer in classical modal testing.

• Earthquakes and Structures
• /
• 제13권3호
• /
• pp.309-322
• /
• 2017

In this paper, a simplified evaluation method of the skeleton curve for reinforced concrete (RC) frame with unreinforced masonry (URM) infill is proposed in a practical form, based on the previous studies. The backbone curve for RC boundary frame was modeled by a tri-linear envelope with cracking and yielding points. On the other hand, that of URM infill was modeled by representative characteristic points of cracking, maximum, and residual strength; also, the interaction effect between RC boundary frame and the infill was taken into account. The overall force-displacement envelopes by the sum of RC boundary frame and URM infill, where the backbone curves of the infill from other studies were also considered, were then compared with the previous experimental results. The simplified estimation results from this study were found to almost approximate the overall experimental results with conservative evaluations, and they showed much better agreement than the cases employing the infill envelopes from other studies.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2020년도 봄 학술논문 발표대회
• /
• pp.4-5
• /
• 2020

The research presented in this paper is subject to RC frame that increases seismic capacity by attaching DT(Double T type) steel frame to reinforced concrete column. The object of this study is not only to build experimental database providing necessary information for retrofit column but also to formulate modeling parameters of RC frame retrofitted by DT steel frame through comparing analysis for analytical model predicting inelastic behavior of reinforced concrete members.

• Steel and Composite Structures
• /
• 제45권4호
• /
• pp.563-577
• /
• 2022

This paper presents experimental and numerical investigations of a new seismic enhancement method for existing reinforced concrete (RC) frames by using an external sub-structure, the hybrid seismic retrofit method (HSRM) system. This retrofit system is an H-shaped frame bolt-connected to an existing RC frame with an infilled-concrete layer between their gaps. Two RC frames were built, one with and one without HSRM, and tested under cyclic loading. The experimental findings showed that the retrofitted RC frame was superior to the non-retrofitted specimen in terms of initial stiffness, peak load, and energy dissipation capacity. A numerical simulation using a commercial program was employed for verification with the experiments. The results obtained from the simulations were consistent with those from the experiments, indicating the finite element (FE) models can simulate the seismic behaviors of bare RC frame and retrofitted RC frame using HSRM.

• Structural Engineering and Mechanics
• /
• 제64권5호
• /
• pp.543-555
• /
• 2017

The non-linear behaviour of integral infilled frames (in which the infill and the frame are bonded together with help of various interface materials) is studied both experimentally and numerically. The experiments were carried out on one-sixth scale two-bay and three-storey reinforced concrete frames with and without infill against static cyclic loading. Three interface materials - cement mortar, cork and foam have been used in between the infill and the frame. The infill, interface and the frame are bonded together is called integral frame. The linear and non-linear behaviors of two dimensional bare frame and integral infilled frame have been studied numerically using the commercial finite element software SAP 2000. Linear finite element analysis has been carried out to quantify the effect of various interface materials on the infilled frames with various combinations of 21 cases and the results compared. The modified configuration that used all three interface materials offered better resistance above others. Therefore, the experiments were limited to this modified infilled frame case configuration, in addition to conventional (A1-integral infilled frame with cement mortar as interface) and bare frame (A0-No infill). The results have been compared with the numerical results done initially. It is found that stiffness of bare frame increased by infilling and the strength of modified frame increased by 20% compare to bare frame. The ductility ratio of modified infilled frame was 42% more than that of the conventional infilled frame. In general, the numerical result was found to be in good agreement with experimental results for initial crack load, ultimate load and deformed pattern of infill.

• 전기전자학회논문지
• /
• 제28권2호
• /
• pp.123-130
• /
• 2024

기술이 급속도로 발전하고 제품 수명주기가 짧아짐에 따라 연구 성과의 도출과 제품 개발 및 출시 과정을 가속화할 필요성이 점차 증대되고 있다. 이에 따라 개발자의 연구 결과를 빠르게 확인하고 적용하기 위한 모의실험을 위한 컴퓨팅 환경이 필요하게 되었다. 모의실험을 위한 컴퓨팅 환경은 가용한 컴퓨팅 자원을 최대한 활용할 수 있어야 하며 실험하고자 하는 다수의 시나리오에 대해서 모의실험을 관리하고 실험 결과 취합을 용이하게 진행해야 한다. 이와 같은 모의실험 환경을 구축하기 위해서 본 연구는 마이크로서비스 아키텍처 기반의 모의실험 환경을 설계하고 구현하였다. 제안하는 모의실험 환경은 모의실험을 수행하고자 하는 사용자가 손쉽게 실험을 수행할 수 있도록 스크립트 기반으로 가용 컴퓨팅 자원을 활용하여 실험 환경을 구성하고 자동으로 시나리오가 배포될 수 있도록 실험 틀을 설계하였으며 사용자가 제공하는 시나리오와 실험 대상 소프트웨어를 활용하여 컴퓨팅 환경과 실험이 자동으로 구성되어 모의실험을 수행할 수 있도록 하였다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.2684-2690
• /
• 2011

The bogie is one of the most important components in a railway vehicle. So a lot of study has been carried out for safety and reliability of the bogie frame in experimental and simulation. In this paper, Presents an experimental study on health monitoring of next generation high-speed train bogie frame. The ultimate objective of this paper is to estimate the sensor located for health monitoring of bogie. The result from this study might be used essential data in order to construct the next generation high speed train bogie frame health monitoring.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
• /
• pp.1043-1046
• /
• 2008

In this paper, we propose a Motion Estimation (ME) using new blocks based on the Frame Difference (FD) between two adjacent frames for Frame Rate-up Conversion (FRC). The proposed algorithm decides the shape of blocks by the FD. The experimental results show that the proposed method has better performance than conventional methods.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
• /
• pp.69-74
• /
• 2000

In this dissertation, experimental research was carried out to study the hysteretic behavior of reinforced concrete frame designed by high performance techniques, using carbon fiber plate, diagonal bracing system with or without steel frame. Experimental programs were carried to evaluate the structural performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. Specimens(RFCP, RFXB, RFXB-F), designed by the improvement of earthquake-resistant performance, were attained more load-carrying load-carrying capacity stable hysteretic behavior.