This paper presents an experimental research aimed at developing a new rubber-based seismic isolator called ‘'Ball Rubber Bearing (BRB). The BRB is composed of a conventional steel-reinforced multi-layered rubber bearing with its central hole filled with small diameter steel balls that are used to provide energy dissipation capacity through friction. in this study, the shear test was performed to compare the NRB & LRB & BRB. bearing shear tests were carried out as per ISO22762 for seismic isolation design standard. A test results showed that EDC & effective stiffness of the BRB is lower than LRB.

To evaluate the traffic safety of PSC box bridge for high running speed up to 500km/h of KTX, a dynamic analysis of displacement spectrum on the bearings of bridge is needed concurrently with existing design specifications. Longitude/transverse directions of displacement spectrum are considered to analyze the dynamic structural behaviors of PSC bridges as well as harmonic running movements of KTX due to three mass; a cargo body, front/rear bogies and four wheel axises connected with two suspensions. KTX power train is modeled by 38 degree-of -freedom ; 6 degree-of-freedom for body and bogies, and 5 degree-of-freedom for wheel axises. The rotation spectrum of KTX resulted in the analysis will be focused on the design specification of KTX running on the bridge, for increasing its speed as a new evaluation standards of traffic safety.

SOC ,which are roads, bridge and tunnel are increasing as development in the world. Although outworn structures need to keep structure maintenance, it become obsolete rapidly because of the technical problem and being ignorant. This paper suggests ubiquitous unmanned inspection auto system which is whenever, wherever shoes in the Bridge

최근 세계가 빠른 속도로 발전하여 교량의 장대화등 특수교량이 늘어나며 예측할 수 없는 대형 자연재해와 인명피해가 발생하는 상황에서 보다 지능적인 점검 시스템이 필요한 상황이다. 교량 유지관리는 안전점검을 통하여 교량의 수명을 최대화 하며 사고발생을 예측할 수 있는 만큼 중요시 되지만, 현재 시행되고 있는 구조물의 점검은 대부분 육안점검이나 수동 측정 장비에 의존하고 있을 뿐만 아니라 접근이 가능한 구간에만 국한되어 있으며, 기존의 모니터링 시스템은 계측만을 위하여 사용되어 지고 있어 계측을 통한 안전확보가 미흡한 상태이다. 따라서 교량의 신축⋅회전 변위흡수, 하중전달의 역할을 하는 핵심적인 교좌장치의 기존 점검방식 문제점을 개선한 유비쿼터스 자동점검시스템을 제시하며 USN(Ubiquitous Sensor Network)기술과 LVDT, 센서를 이용하여 실시간 교좌장치 이동변위를 전송받고, 이동변위의 설정된 한계 값을 초과할시 교량관리 시스템에서 자동으로 액추에이터를 구동하여 VMS와 SMS를 통해 정보를 제공하는 자동점검시스템을 개발하는데 목적이 있다.