A new clamped mechanical splice system was proposed to develop structural performance and constructability for precast concrete connections. The proposed mechanical splice resists external loading immediately after the engagement. The mechanical splices applicable for both large-scale rebars for plants and small-scale rebars for buildings were developed with the same design concept. Quasi-static lateral cyclic loading tests were conducted with reinforced and precast concrete members to verify the seismic performance. Also, shaking table tests with three types of seismic wave excitation, 1) random wave with white noise, 2) the 2016 Gyeongju earthquake, and 3) the 1999 Chi-Chi earthquake, were conducted to confirm the dynamic performance. All tests were performed with real-scale concrete specimens. Sensors measured the lateral load, acceleration, displacement, crack pattern, and secant system stiffness, and energy dissipation was determined by lateral load-displacement relation. As a result, the precast specimen provided the emulative performance with RC. In the shaking table tests, PC frames’ maximum acceleration and displacement response were amplified 1.57 - 2.85 and 2.20 - 2.92 times compared to the ground motions. The precast specimens utilizing clamped mechanical splice showed ductile behavior with energy dissipation capacity against strong motion earthquakes.

After the manual shutdown of the Wolseong nuclear power plant due to an earthquake in Gyeongju in 2016, anxiety about the earthquake safety of nuclear power plants has become a major social issue. The shear wall structure used as a major structural element in nuclear power plants is widely used as a major structural member because of its high resistance to horizontal loads such as earthquakes. However, due to the complexity of the structure, it is challenging to predict the dynamic characteristics of the structure. In this study, a three-story shear wall structure is fabricated, and the in-structure response characteristics of the shear wall structure are evaluated through shaking table tests. The test is performed using the Gyeongju earthquake that occurred in 2016, and the response characteristics due to the domestic earthquake are evaluated.

Micro-Electro-Mechanical Systems (MEMS) sensors have been widely used in Structural Health Monitoring due to their convenience and lower costs in comparison to conventional sensors. Triggered measurements are relevant in events such as earthquakes because unlike continuous measurements, they only record the structural response once an event happens. This is more cost effective and it makes the data more manageable because only the required measurements from the event are recorded. The most common method of triggering is amplitude triggering. However, lower input amplitudes (less than 0.1g) cannot be triggered by using this method. In this paper, sound triggering was introduced to allow triggered measurements for lower input amplitude values. The performance of the sound triggering and amplitude triggering were compared by a series of shaking- table tests. It was seen that sound- triggering method has a wider frequency (0.5~10Hz) and amplitude (0.01~1.0g) range of measurements. In addition, the sound triggering method performs better than the amplitude triggering method at lower amplitudes. The performance of the amplitude triggering, in terms of the triggering being simultaneous improves at higher input amplitudes.

Wireless sensors are more favorable in measuring structural response compared to conventional sensors. This is because they are easier to use with no issues with cables and are considerably cheaper. There are several applications that can be used in recording and analyzing data from MEMS sensor installed on an iPhone. The Vibration App is one of the applications used and there has not been adequate research conducted in analyzing the performance of this App. This paper analyzed the performance of the Vibration App by comparing it with the performance of an ICP sensor. Results show that natural frequency results are more accurate (error less than 5%) in comparison to the amplitude results. This means that built- in MEMS sensor in smartphones are good at estimating natural frequency of structures. In addition, it was seen that the results became more accurate at higher frequencies (5.0Hz and 10.0Hz).

In this study, an externally reinforced structural system for SMC(Sheet Molding Compound) panel water tank, designed according to the Japanese design code, is experimented to evaluate its seismic performance. The test tank is 3m long, 2m wide and 3m high, considering the capacity and size of the shaking table. The measured hydrodynamic pressures are found to be approximately 70% of the Japanese design code values. It may be partially due to the convex shape effect of the unit panels. The analytical results of externally reinforced system based on the measured dynamic water pressures are found in good agreement with the test results. If the design hydrodynamic pressures are estimated properly, the proposed analytical model for the externally reinforced water tank becomes a useful design tool and the Japanese design code is found to provide a safe design for the external frames of SMC panel water tank.

본 연구에서는 진동대 실험을 통한 수계형 소화설비의 내진성능평가를 실시하였다. 실험에 사용된 수계형 소화설비 시설에는 일반 배관, 내진형 배관, 펌프 등 이다. 그리고 수계형 소화설비 시설의 동적거통특성을 파악하기 위하여 El-Centro 지진파 50%,70%, 100%, 120% 수준의 가진을 가하였다. 그 결과, 내진형 설비보다 일반형 설비에서 변위 응답과 가속도 응답이 큰 것으로 보아내진형 설비가 일반설비에 비해 내진성능이 우수하다는 것을 알 수 있었다. 또한, 가진 수준별 가속도 응답스펙트럼을 통하여 일반형시설과 내진형 시설의 성능 평가뿐만 아니라 작은 규모의 지진에서도 일반형 설비의 파괴가 일어날 수 있다는 것을 알 수 있었다. 본연구를 통해 수계 소화설비의 내진성능을 평가 할 수 있었고 수계 소화설비의 내진성능 기준을 검증할 수 있었다.

이 연구의 목적은 진동대 실험을 통한 철근콘크리트 교각의 지진거동을 파악하는데 있다. 사용된 프로그램은 철근콘크리트 구조물의 해석을 위한 RCAHEST이다. 재료적 비선형성에 대해서는 균열콘크리트에 대한 인장, 압축, 전단모델과 콘크리트 속에 있는 철근모델을 조합하여 고려하였다. 동적 평형방정식의 해는 HHT 법에 의한 수치적분으로 구하였다. 이 연구에서는 진동대 실험을 통한 철근콘트리트 교각의 지진거동을 파악하기 위해 제안한 해석기법을 신뢰성 있는 실험결과와 비교하여 그 타당성을 검증하였다.

지진에 의한 진동이 건물에 미치는 영향을 최소화 하기 위하여 강철 스프링에 천연고무 및 합성고무를 피복 성형한 새로운 형태의 기초분리장치를 개발하고 물성실험을 실시하였으며 모형구조물에 부착하여 진동대실험을 수행하였다. 사용된 모델은 1/4로 축소된 1경간 3층의 철골구조물로 지진 진동을 사용하여 기초분리장치의 수평, 수직방향 안정서와 제진효과를 검증하였다. 얻어진 데이터를 분석한 결과 실험에 사용된 모든 종류의 방진베어링이 지진진동에 의한 가속도를 줄이는데 효과적인 것으로 나타났다.

지진 피해 상황을 살펴보면 중소 규모의 지진이 발생하였을 때 구조물의 붕괴에 의한 직접적인 피해가 아닌 화재와 같이 소화 설비, 전력설비, 통신설비 등 주요 기간설비의 기능상실로 인한 피해가 많이 일어나고 있다. 이와 같은 2차 피해를 줄이기 위해 소화설비의 내진설계는 반드시 필요하다고 할 수 있다. 본 연구에서는 수계소화설비의 내진성능 평가를 위하여 골조 구조물에 옥내소화전설비(배관, 펌프, 수조, 소화전)를 설치하여 진동대 실험을 실시하였다. 그리고 일반시설물과 내진시설물의 거동차이를 확인하기 위하여 각 설비는 기존 건축물에 시공되어 온 일반형 시설물과 내진형 시설물을 동시에 시공하여 시험을 수행하였다. 또한, 시설물의 거동특성을 파악하기 위하여 시설별 변위응답, 가속도 응답, 가속도 응답 스펙트럼을 분석하여 시설물에 대한 내진성능을 평가하였다.