From the test results, it was found that the compressive strength and the resistance of chloride ion penetration were evaluated the slag content of the concrete for bridge pavement. Compressive strength test results showed that initial strength was decreased as slag replacement ratio increased. The chlorine ion penetration performance increased with increasing strength.

This study is for the damage with lack of drain pipe length and it is presented for the improved references which is ｢Design and management guidelines of road drainage facilities｣.

In this study, the risk matrix method was applied to reduce the number of post-tension survey in maintenance. The risk matrix weights and evaluation indexes were studied according to the maintenance system.

The signal characteristic of radar wave on concrete decks is determined by the attenuation of the radar due to the conversion of EM(Electromagnetic) energy to thermal energy through electrical conduction, dielectric relaxation, scattering, and geometric spreading. In this study, it is found that the attenuation of radar signal received on top rebars in bare deck concrete with 2 way travel time shows a general decreasing linear trend because of its same relative permittivity and conductivity. The radar signal after depth-normalization, can then be interpreted as being principally influenced by the content of chlorides penetrating cover concrete, which caused corrosion of rebars in bridge decks.

Creep Factor using the temperature data can be measured during construction of the PSC more accurate construction of the bridge to enhance the reliability of configuration management. In addition, even sag configuration management using the temperature data without installing the expensive laser displacement meter to be installed for the deflection calculation is expected to be applied.

Dynamically inelastic analyses on bridge columns were carried out based on the Korea bridge design code revised in 2010. To evaluate the effect of ductility demand-based analysis, rectangular and circular sections of bridge columns were selected. It was found that the analysis method shall be applicable to seismic evaluation for conventional structures as well as RC bridges.

Current design codes (AASHTO, Korean Highway Bridge Design Code) do not account for dynamic effects. Since, the dynamic impact analysis is complicate to recommend and analysis. In this study, concrete bridge column were developed with two boundary conditions in order to take account dynamic behavior of the column and in-direct impact analysis was conducted. Furthermore, a comparison study of in-direct impact analysis with direct impact analysis was conducted.

Current design standards (Korea Highway Bridge Design, AASHTO), the dynamic behavior under the impact loading has not been considered, only considered static force for designing bridge column against vehicle collisions. In this study, vehicle collisions to concrete bridge column were developed with various boundary conditions, and a comparison study of direct impact analysis of vehicle to bridge-column with in-direct impact analysis was performed.

In this paper, the effect of selection of response parameters such as deck displacement and supporting moment on impact factor of open spandrel-concrete deck arch bridge is investigated by using a finite element analysis. In the result, under the vehicle loads passing the bridge from left to right direction, the highest value of impact factor develops when the supporting reaction moment at the far end (right end) of arch rib is selected.

Regarding deck replacement of bridge structures, it is important to minimize total construction time and costs ensuring safety of it. Since cast-in-place concrete deck takes a long time for replacement, precast concrete deck system is considered as an effective alternative. Structural performance, economic feasibiltity and constructability of precast deck system are mostly affected by joint properties between precast deck panels. To improve the joint properties, this research presents a new precast deck system of ribbed section joint with protruding lower concrete and verifies tits applicability through parameter tests.

The marine structures vibrate due to waves, current and wind load. Therefore, the marine structures is needed to evaluate the vibration usability for health and comfort of the user. In this paper, the vibration usability evaluation applying to the ISO 2631-2 and ISO 6954 standard was performed and discussed.

고속철 PSC 교량 마찰받침의 내구성 평가를 위하여 해당국내 기준의 미비로 DIN EN 1337-2 과 CUAP 기준을 적용하여 마찰판의 5000 m 이동거리에 대한 마찰 시험을 수행하였다. 적용온도와 이동속도에 따라 마찰계수를 계측하고 기준에서 요구된 상한 한계와 비교하여 고속 주행으로 발생하는 증가된 이동거리에 대한 적합한 내구성 평가기준과 실험방법을 개발하고자한다.

The bridge is one of the important infrastructures. If vehicle collision is occurred in bridge column, It can caused for bridge collapse. Bridge columns are vulnerable to impact loadings of Vehicles. In this study, Non-linear dynamic analysis of reinforced concrete bridge column in impact loading were performed using LS-Dyna.

콘크리트 방호벽 및 중앙분리대는 교량의 부속시설이지만, 슬립폼 시공과 넓은 비표면적으로 인해 초기재령 균열이 발생하기 쉽다. 본연구에서는 대형 교량의 방호벽과 중앙분리대 콘크리트의 외관조사 및 비파괴실험을 수행하여 균열의 원인과 발생 균열의 패턴을 분석하였다. 이를 위해 시공기간을 고려하여, 건조수축, 수화열 해석이 수행되었으며, 현장의 환경조건을 고려하여 소성수축 특성을 평가하였다. 평가결과 대상구조물의 균열 원인은 철근위치에 따른 소성침하균열, 소성수축 및 건조수축에 의한 복부균열, 재료분리에 따른 상부균열로 추정할 수 있었다. 또한 균열원인과 발생 패턴을 도식화하였으며, 시공 및 재료분야에서 균열제어대책을 제안하였다. 해상위 교량에 설치하는 중앙분리대 및 방호벽 콘크리트는 환경조건 (풍속, 온도, 습도)에 매우 민감하여 초기재령균열이 쉽게 발생하므로 재료선택 및 시공방법에신중을 기해야 한다.

Vehicle collision is one of cause for structural failure. The increased load carrying capacity of the truck is also a threat for existing structures. Recent studies show the actual shear capacity of the column of bridge is larger than industrial standards. In this study, truck-column collision model was developed and load carrying capacity of a column were evaluated.

Dynamic analysis of PSC box bridge bearings for high-speed KTX train vehicles has been carried out to evaluate a running safety of train. Improved numerical models of bridge/vehicle and interaction between bridge and train are adopted, where bending and torsional modes are considered. Dynamic/static sliding distances of the bearings according to the KTX running speed are proved as a major parameter rather than the AASHTO and EN1337-2 focused on the distance by temperature variations.

Natural frequency changes of an in-service concrete bridge have been monitored to analyze the dynamic characteristic according to temperature and embedded depth changes. 7 acceleration sensors are attached to the bridge, and 11 time impact experiments have been done using the impact hammer. The natural frequency has a trend to drop as the surface temperature of the body goes up. And it also has a trend to decrease as the embedded depth of the bridge foundation increases.

본 연구에서는 기존의 교면포장 공법인 아스팔트와 라텍스 개질 콘크리트 포장의 단점을 극복한 교면포장용 고성능 콘크리트의 개발을 위하여 교면포장용 콘크리트 슬래브의 내구성을 평가하였다.교면포장용 고성능 콘크리트의 배합으로는 A-Type (실리카퓸 6%), B-Type (실리카퓸 6%+플라이애쉬 20%), C-Type (실리카퓸 6%+고로슬래그 40%)의 3가지 종류를 고려하였고 현재 교면 포장에 사용되고 있는 라텍스 개질 콘크리트 포장(LMC)과 일반 콘크리트 포장(OPC)에 대하여 비교 평가하였다. 내구성 평가를 위한 실험으로는 정적재하실험과 피로실험을 실시하였으며 처짐 및 균열폭과 콘크리트 및 철근 변형률을 측정하여 비교하였다. 또한 범용 프로그램인 ABAQUS를 이용한 유한요소 해석을 통하여 실험결과를 검증하였다. 실험결과, 정적재하시험의 경우 고성능 콘크리트 배합이 LMC 및 OPC에 비하여 역학적 특성 및 내구성에 있어서 우수한 성능을 보여주었다. 고성능 콘크리트 배합 중에선 A-Type이 처짐 및 균열저항성에 있어서 가장 우수한 것으로 나타났다. 피로시험의 경우에는 고성능 콘크리트 배합이 LMC 및 OPC에 비하여 균열저항성이 우수한 것으로 나타났으나 전체적인 거동은 모든 시험체가 일정하게 유지되어 반복하중에 대하여 충분한 내하력 및 강성을 확보하고 있는 것으로 판단된다. 유한요소 해석 결과, 처짐의 경우 1~4mm, 변형률의 경우 최대 12%의 상대오차를 보여 실험결과와 유사한 변형을 보였다

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