The needs for consistent maintenance for highway bridge has been increased in nowadays. This study is to investigate fundamental database about in-depth inspection for publishing the repair and strengthening methodology. It is because the maintenance budget should be used effectively for optimal maintenance of infrastructures. In order to investigate the maintenance history of highway bridges, the database of in-depth inspection from 1996 to 2012 was analyzed. For the superstructure type, PSC box girder bridge which was the most common among the concrete bridges in the inspection database was investigated.

We have carried out the bridge inspections according to the laws not considering the characteristics of damages. Also the current condition based inspection cannot consider the rate of bridge deterioration. But it is reasonable to classify the inspection interval according to the risk of each bridge. This suggests the risk based inspection methodology.

In this paper, the maintenance characteristics for the abutment and pier in highway bridges are investigated. The repair and rehabilitation properties are integrated from the Highway Bridge Maintenance System until 2013. Whole numbers of the abutment and the pier in highway bridges are over 37,000. The repair and/or rehabilitation are carried out for the substructure of about 10,240. More than 35 billion won of budget for repair and rehabilitation were used until now. It can be known that during one year about 37,000 won of budget has been used to maintain and preserve each substructure.

This study developed a fire risk assessment procedure for the bridges on the highway. The fire risk assessment consists of three part. PRA, SRA, and DRA. with The preliminary risk analysis (PRA), considering the bridge to need analysis. The simplified risk Analysis (SRA) assesses the risk level of the bridge based on bridge information database. detailed risk analysis (DRA) conducts for high risk bridge in the SRA. In SRA, factors which influence fire event occurrence and vulnerability are investigated. based on risk assessment, select proper countermeasures.

The number of highway bridge has been doubled for last 10 years. It is because many new highway routes has been completed since 2000. As a result, the maintenance cost of highway bridge has been increased as well. Therefore, to predict the long-term maintenance costs, there is a need for a method. To solve this problem, various studies about the life cycle cost analysis was conducted. Maintenance costs for members of the highway bridge is quite different to each other. Therefore, all the elements that are managed by the same proportion is inefficient. In this study, the distribution characteristics of maintenance costs for members of the highway bridge were analyzed using research data and highway bridge maintenance system data.

In this paper, analysis on chloride content and carbonation of concrete members in highway bridge is realized. As a result, it is considered that the amount of snowfall, de-icing salt, freeze and thaw affect chloride content, and concrete members with respect to carbonation in highway bridge are safety at least for now

To suggest the preliminary data for effective maintenance of RC deck slabs of bridges, the damage characteristics of RC deck slabs are quantitatively analyzed in the present study. Damages of RC deck slab are classified into damage patterns and its details. And, rate of damage possess, cause of damage occurrence and time of damage occurrence are reviewed from this study.

We have carried out the bridge inspections according to the laws not considering the characteristics of damages. It is reasonable to classify the inspection interval according to the risk of each bridge. This suggests the risk based inspection inspection methodology.

To suggest the preliminary data for effective maintenance of bridge structures, the damage patterns of expressway bridges are quantitatively analyzed in the present study. Damages detected in concrete deck slab, girder(concrete/steel), abutment and pier are classified into damage patterns and details. From this study, the damage characteristics of expressway bridges are figured out, and most of damages are defect which is resulted from a shoddy and fault construction

A bridge is composed of many elements as deck, girder, pier and so on. The deterioration characteristic for each element is useful to establish the maintenace strategy and to determine the inspection interval. This study analyzed the derioration rates of bridge elements in Korea Expressway with a lot of precision safety diagnosis reports.

Degradation characteristics of highway bridge condition rate was studied. Factors affecting degradation rate such as bridge type, member type, and environmental exposure were analyzed by using bridge condition data in Highway Bridge Management System. It can be drawn from the analysis that condition degradation rates are different from type to type of bridge member, and environmental exposure such as the amount of chloride used, the amount of snowfall can accelerate bridge condition degradation

We have carried out the bridge inspections according to the laws not considering the technical knowledge. It is reasonable to optimize the inspection practice within the limited resources. This study reviews the expressway bridge inspection practice by analysing the case of the developed countries.

For the safety assessment of the existing bridges on the expressway, the statistical properties of the truck traffic on the expressway needs to be investigated. Also, the reduced uncertainties involved in the assessment and the shorter reference period for the assessment are utilized for the modeling of the live load for evaluation of the existing bridges.

In this paper the change of condition ratings are investigated for old highway bridges. The results of condition ratings are selected from those by professional inspector. The bridges are categorized as four types. The inter-relationship of service life, structural elements, condition ratings are investigated to evaluate the deterioration characteristics of bridges

최근에 제주 근해에서의 지진발생 횟수와 지진발생 가능성의 증가로 인하여 교량 구조물의 손상 및 붕괴에 대한 사회적 관심이 대두되고 있고 교량 구조물이 손상되어 원래의 기능이 상실되거나 제한될 수 있으므로 본 연구는 제주도내의 사회적 관심에 대한 정량적 자료를 제시할 수 있다. 제주도는 다양한 식물이 자생하고, 생물의 보고라 할 수 있으며 화산폭발로 형성된 분화구, 오름 등과 다양한 식물이 결합되어 경관적 가치가 매우 높아 유네스코 세계자연유산, 세계지질공원 및 세계7대자연경관으로 지정되었다. 또한, 제주도 인구의 90% 이상이 표고 200m 이하의 해안지대에 거주하고 있으므로 제주 도심에 위치한 교량 구조물의 내진성능평가는 반드시 필요한 시점이다. 지진발생시 교량 구조물이 손상되어 원래의 기능이 상실되거나 제한되면 국제관광지로서의 위상도 손상되며 제주도 인구의 90% 이상 거주하는 해안지역에서 지진으로 인해 발생된 환자들이 병원으로의 이동이 제한될 수 있다. 본 연구는 제주도 해안도로상에 위치한 교량의 기초자료, 교량 구조물의 시스템 등을 파악하고 재료비선형해석을 수행하여 휨파괴 또는 전단파괴의 파괴형태를 고려한 하중-변위 관계를 제시하여 내진성능을 평가함을 목적으로 한다.

본 연구는 중요한 사회기반시설물인 도로교량의 상태등급에 영향을 미치는 요인을 분석하였다. 이항로짓모형을 이용하여 공공관리주체가 관리하는 1․2종 도로교량의 최근등급과 6년간의 등급변화에 영향을 미치는 결정요인을 실증적으로 파악하였다. 분석한 결과, 등급에 가장 크게 영향을 미치는 것은 시설물의 재원특성이 아니라 관리특성으로 나타났다. 그리고 시간이 경과할수록 관리특성 차에 의한 등급차가 커질 가능성이 있는 것으로 분석되었다. 그리고 C․D일 때 등급이 개선․유지 될 가능성이 높고 A․B등급은 상대적으로 악화 비중이 높게 나타났다. A․B등급 90%라는 기본계획의 목표를 달성하기 위해서는 B등급의 C등급으로의 악화 비중을 낮추는 방안도 함께 고려하는 것이 도움이 될 것으로 판단된다. 그러나 본 연구는 분석자료의 한계를 내포하고 있으며 이를 보완하기 위해서는 여러 기관에 산재되어 있는 시설물 DB들을 통합하는 작업이 필수적으로 이루어져야 할 것이다.