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.

In this study, lateral movement of 78 single-span bridge abutment was investigated. The result showed that the movements were commonly within the range of 10 ~ 30mm. It is recommended that the clearance between the slab and the backwall should be adjusted to accept the movement of the abutment.

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.

The previous design of the shear key is designed by considering only the strength of the anchor the body. However, the strength of the anchor portion often be influenced by steel strength of the anchor, as well as the strength of the concrete around the anchor. The purpose of this study was to improve the problem of the existing design methods by considering the performance of the shear key body and the anchor system.

Bridge Design Specifications (2005) revision was included for the first time in the seismic isolation design. However, in 2005, it is overly simplified, revised in 2010 to conduct performance test, prototype test, quality test of seismic isolation device. Details standards for scaled model test and quality test of seismic isolation device is required to use a rule is recognized at domestic and foreign. This study was to establish quality control test standards by research and review of test types and test methods of seismic isolation devices.

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

In this study on the seismic behavior of the bridge that does not affect the safety of the range of variation of the length of the pier was looking for. The type of bridge is difficult to set clear standards for the geometric stiffness of the bridge, due to the diversity of soil conditions on the number of all cases. Thus, PSC girder and steel box girder bridge the representative of the highway bridge types were analyzed. Changes in the length of the pier ± 5% increments up to 20% were analyzed.

In this paper, structural analysis and causual analysis of superstructure horizontal displacement by retaining wall displacement is realized, as a result, it is considered that retaining wall displacement by soft soil and lateral flow pressure occurred in the soft soil affect superstructure horizontal displacement. Although resistance force is slightly larger than the action force when reviewing superstructure safety, it is considered that repair and reinforce are necessary when considering safety factor with respect to the difficulty of estimating accurate load, and the uncertainty of soil condition.

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.

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

고지방식이로 비만 및 고지혈이 유발된 실험동물에서 체중, 혈중지질, 체지방, 혈청생화학적 검사 및 장기무게를 측정하여 진피에탄올추출물 섭취로 인한 혈중지질 개선, 체지방 감량 및 시험물질의 간기능 및 장기무게 변화에 미치는 영향에 대해 조사하였다. 체중 및 사료이용효율은 고지방식이에 의해 대조군에서 증가현상을 보였으며, 진피 에탄올추출물 섭취군인 O1과 O5군에서 시험물질 섭취로 인한 체중증가량 감소와 식이효율 감소현상을 보였다. 혈청 생화학적

염해는 구조물 열화의 원인이 되는 주요인자 중의 하나이다. 고속도로 교량에 있어서 제설제는 동결작용으로 인한 표면 스켈링을 매우 증가시킨다. 열화된 콘크리트는 염해환경에서 내구성이 저하된다. 본 연구에서는 147개 교량의 진단보고서를 조사하고 21개 교량 바닥판의 코어샘플에 대하여 실험과 분석을 실시하였다. 시험결과는 콘크리트 바닥판의 피복두께는 공용수명 30년 이상을 사용하려면 8cm이상이 필요하다는 것을 보여준다.

재하시험은 교량의 내하력을 측정하는 효과적인 방법이다. 국내에서 교량의 내하력평가는 계측값과 해석값을 비교하여 산정된 응답보정계수를 사용하여 산정한다. 본 논문에서는 통행차량에 의한 응답보정계수를 결정하는 방법을 개발하였다. 제안된 방법은 차량효과를 고려하기 위하여 컴퓨터 시뮬레이션의 결과에 기반을 두었다. 제안된 방법과 기존 방법의 비교결과는 제안된 방법이 교량의 공용 내하력을 비교적 잘 예측한다는 것을 알 수 있다.

This study is to develop the technology and the ways of the practical use of the integrated digital map of and Electronical Navigational Chart(ENC) and Digital Terrain Map(DTM) for the effective and scientific based conservation, development and management. In this study, as preliminary studies to make eventual integrated maps, the concept of coastal areas are defined and the characteristics of digital maps developed by Korean Geography Institute and National Marine Investigation Institute are carefully analyzed. A test coastal map was developed based on the integrated digital map, a high resolution satellite image and Global Positioning System. Results from the edge matching analysis of coastal lines shows 8 meters difference in maximum. The problems, causes and solutions for the edge matched differences are described. Furthermore, the practical value of utilization, future use and various field of application are described based on the integrated digital map data base of coastal area.