현재 국내외적으로 다양한 강재 댐퍼의 형상에 대한 연구가 이뤄지고 있다. 강재 댐퍼는 제진장치 중 하나로 항복을 통해 지진에너지를 흡수 및 소산하여 본 구조물을 보호한다. 최근 적용되고 있는 면내 전단 변형에 의해 작동하는 댐퍼는 응력이 특정 부위에 집중되어 재료의 대부분이 본래의 역량을 발휘하지 못하는 한계가 있었다. 따라서, 본 연구에서는 이 한계를 극 복하고자 전역 최적화 기법 중 하나인 뻐꾸기 탐색을 적용해 최적 형상을 설계하였다. 탐색된 최적 형상을 토대로 수치해석과 실제 실험을 통한 성능검증을 수행했다. 최적 형상으로 설계된 댐퍼는 안정적인 이력거동을 보이고, 높은 에너지 소산능력을 확 보하는 것으로 나타났다. 본 연구에서는 전역 최적화 기법을 적용한 최적 설계 방법을 제시하고 그 결과를 검증함으로써, 다양한 형태의 공학적 문제 해결에 대한 적용 가능성을 제시하였다.

This study mainly evaluate the aseismic performance of the existing intake tower structure, which is one of the national important infra structures, on the basis of the refined finite element (FE) analysis results. The realistic evaluation for structural damage was conducted by using the nonlinear material model that takes tension and compression strength of deteriorate concrete into consideration during FE modeling. In addition, not only tension crack but also compression crushing was analyzed by utilizing field contour functions provided in the program during nonlinear dynamic analyses when peak ground acceleration (PGA) occurred. After observing FE analysis results, it can be shown that the damage of the intake tower is the most likely to occur at the water level and the base support.

The safety issue of PSC box Girder Bridge is being brought up to the surface. For countermeasures, we developed an extensive material testing procedures and applied it into our existing bridges. We believe that these set of newly constructed procedures are well within the reasonable mark. With that, we now foresee the necessity in systematic improvement and ample supply of its technology in order to secure the future safety of PSC box girder bridges.

The safety issue of PSC box girder bridge stood out. So, we developed material testing method and procedures and applied them to existing bridge. Consequently, We found that the procedure we developed is very reasonable.

The safety issue of PSC box Girder Bridge is being brought up to the surface. For countermeasures, we developed an extensive material testing procedures and applied it into our existing bridges. We believe that these set of newly constructed procedures are well within the reasonable mark. With that, we now foresee the necessity in systematic improvement and ample supply of its technology in order to secure the future safety of PSC box girder bridges.

Dissipating a risk information from heavy rainfall disaster frequently undergoes synchronous problem during pushing message. This work investigates a method based on RESTful API for guaranteeing the reception of messages from the synchronous problem.