The extent damages of concrete structures due to fire occurrence are evaluated. The evaluation of fire safety is evaluated by using the inspection, non-destruction test, fracture test(concrete SEM analysis, concrete heat analysis, rebar fracture test. The criteria for determining the safety of concrete structures are presented using evaluation results.

산악지역의 비탈면에서 발생되는 토석류에 의한 피해를 예측하기 위해 비탈면 평가를 통하여 취약지역을 선정하여 안전성 검토와 토석류 확산 시뮬레이션을 실시하고자 하였다. 그 결과, 일부 지역에서 토석류에 의한 도로 구조물 및 민가 피해가 발생될 것으로 예상됨에 따라 토석류 예방 및차단시설이 계획될 필요가 있는 것으로 판단된다.

Reconstruction of the bridge is constructed to well foundation at the basement. Therefore, the existing bridge should evaluate the impact according to blasting construction. The result of displacement are presented the standard dispacement of the existing bridge.

Tried to photographing of aerial Image using unmanned aerial vehicle for applied to safety inspection on a large area or inaccessible. In result, 3D Spatial Information data were acquired, understand the overall terrain and coastline to based on data, compared to traditional aerial images and analyzed. Finally, identified the regions to requiring continuous monitoring by assessment of a disaster risk. We hoping to help build to continues data for identified the changing shape over time.

In case heavy loads exceeding current design load passes the bridge, pre-structural analysis that reflects the axle load and the distance between Axles are being performed. Then, Measures regarding passing heavy loads are established based on the result of pre-structural analysis. However, when requirements of serviceability of bridge have not met or failure to obtain structural design report or shop drawing due to lack of maintenance occurs, section modulus should be reasonably estimated. Especially, in case of Pre-stressed Concrete Girder Bridge, if detailed information on tendon is inadequate, imposing vehicle weight restriction should be considered thoughtfully. The purpose of this study is to establish rational approach about passing heavy loads targeting PSC Girder Bridge that has failed to secure the details of cross section. In order to do it, tendon's profile was estimated and its estimated result was verified through pre-monitoring. Furthermore, by conducting a nonlinear analysis, the reliability of the analysis was determined in simulating the stiffness of a member and based on proven section modulus; the behavior of a special cargo (U-EA101) that weighs 5,136.15kN was reasonably predicted

The leak issues that arise in the 2-Arch Tunnel are caused by groundwater being trapped in the central pillar portion. Therefore, the most reasonable repair method should be suggested after the analysis of what causes the leak.

In the case of using highway bridge abutments on soft ground, the soft ground often causes serious troubles such as lateral movement of bridge abutments by lateral surcharges. Lateral movement of bridge abutments cause damage of expansion joints and bearings, parapet wall cracks, settlement of approach slabs. In this study, the causes and countermeasure of lateral movement of abutments were investigated.

The results presented in this paper also provide a summary of an experimental investigation, in which reinforced concrete beams were strengthened with carbon fiber sheets and subjected to fatigue loading. The comparison shoes that the analytical modal provides reasonably accurate prediction of deflections. Although carbon fiber composites were used for the evaluation, the modal is also applicable to other types of fibers.

본 연구는 다양한 직경-두께비와 콘크리트 강도를 고려한 콘크리트 충전강관의 휨 거동을 다루었다. 유한요소 해석을 위하여 상용 프로그램 LUSAS를 사용하였으며, 충전 강관의 콘크리트와 강 사이의 부착면의 상세거동을 고려하기 위하여 조인트 요소를 적용하였다. 또한, 콘크리트와 강관의 비선형성을 고려하기 위하여 소성영역에서 증가된 응력을 사용한 콘크리트와 강의 응력-변형률 곡선을 사용하였다. 제안된 방법으로 구한 수치해석 결과는 등분포하중을 받는 강관의 하중-변위 곡선에 대한 실제 실험 결과와 잘 일치하였다. 몇 가지 매개변수 연구는 서로 다른 직경-두께비와 콘크리트 강도에 대하여 휨 영향을 받는 콘크리트 충전강관의 구조적 특성에 초점을 두었다.