Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

To evaluate seismic performance of rail type modular bridge expansion joint system with excellent durability and large expansion length, we tested simulation of the seismic behavior in the thesis. Seismic response behavior analysis created artificial seismic wave applying design basis response spectrum from Korea(KS), USA(AASHTO LRFD) and Europe(Eurocode) standards.

수도의 인구가 급증함에 따라 수원확보에 어려움을 겪고 있는 실정이다. 상수도시설은 준공 후 관의 매설로 인하여 관의 부식 및 노후화를 파악하기가 어렵다. 이러한 이유로 수도관로의 누수 파악과 누수로 인한 경제적 손실을 막기가 어렵다. 본 연구에서는 S대교의 누수량을 조사하고 시축관 설치 후의 누수량과 비교하여 누수감소량을 조사하였다. 그 결과 누수감소율이 약 98 %로 나타났으며, 이는 신축관을 설치하여 누수량을 감소하고 경제적 손실을 줄일 수 있는 것으로 판단된다.

This paper reports the result of five type vibration and noise tests to expansion joints. Field tests on the vibration and the noise at expansion joints, rail type and finger type joints which are typical ones in bridge with short or middle span, are performed and performance of expansion joints are analyzed.

As the service period of bridges becomes increased the maintenance and management of existing bridges become also more important. Korea Expressway Corporation has collected data on the maintenance for a long period but those obtained data has rarely been thoroughly analyzed for the maintenance purposes. This study investigated the service life of extension joint of bridge among various bridge members and this attempt should be very meaningful as using the data obtained from the field. The service life of the extension joints can be used for the development of maintenance strategy in the future.

Performance tests of low noise expansion joint for durability were carried out. As a result of tests, low noise expansion joint had the fatigue durability and the resistant performance for transverse direction displacement