최근 연달아 경주와 포항에서 발생한 지진 이후 국내에서는 지진파와 구조물 내진성능에 대한 사항을 새로운 문제로 인식하고 있다. 향후 매우 큰 지진이 발생할 가능성이 높아 내진보강 성능이 미흡한 석탄 화력발전소에 대한 내진 신뢰성 향상이 요구되고 있다. 본 연구에서는 화력발전소 보일러 구조물의 지진 시 거동을 파악하고자 축소모형을 통한 진동대 실험을 수행하였으며, 실험결과 보일러는 Pendulum 거동을 나타내어 구조물과 다른 주기거동을 보이는 것으로 나타났다.

In thermal power plant, steam is made by boiler. As it rotates turbine, electric power is generated. Thermal power plant has a high-rise structure that has a boiler and other equipment. Thermal expansion of the boiler is large because combustion temperature is high. The boiler vibrates easily because it is suspended from the top of the support structure in order not to restrict deformation by thermal expansion. Thus, the boiler structure supported by the hanger is very vulnerable to earthquakes. In this study, numerical analysis was carried out in order to investigate behavior of the boiler structure in the thermal power plant under earthquakes.

This study was performed an experimental study on mortar containing phytoncide solution. The compressive strength properties with various phytoncide containing ratios were evaluated. The phytoncide solution containing ratios adopted in this study were 0, 2, 4, 6, 8 and 10%. The compressive strength was measured at 3, 7 and 28 days for the hardened mortar specimens. According to the experimental results, the phytoncide has not affect the compressive strength and flow.

These days, inexpensive and high efficiency UAV(Unmanned Aerial Vehicles) of disaster prevention and spatial information has been given more attention. But studies about test of accuracy of UAV were not enough despite high interest. UAV technology has been developed for military purposes, but in recent years, it has been used for various purposes in different forms in the private sector as spread to the public sector. However, since the study applying the UAV technologies to the inspection and maintenance of structures are insufficient so far, this study suggests an application method of UAV technology for inspection and investigation of infrastructure facilities. If the UAV technology is used in inspection and investigation of infrastructure facilities, it will be able to conduct a safety check and inspect high areas and narrow passages, which are difficult or impossible to access by manpower, and further improve the safety of the structure.

In this study, some items assumed to evaluate a Load Carrying Capacity of unknown properties bridge. The 1st, non-reinforced concrete slab 2nd, pre-cast slab 3rd, non-composite bridge. The reason why its assumed like these is to calculate the bridge on critical condition. The Load Carrying Capacity is calculated using WSR(working stress rating) method.