The number of areas where slopes is exposed is increasing constantly due to continuous expansion of infrastructure and urban development in our country where is mostly mountainous areas, and the number of man-made disasters is also increasing accordingly. It is necessary to develop new durable seed spraying soil materials that enable stable greening on rock slopes and establish the optimal construction method that is suitable for such materials. Therefore, a basic rearch on a method to replicate the field construction method of seed spraying soil materials indoors, produce and evaluate the specimen was carried out in this study.

This is A Study on the Bond Performance of Synthetic Polymer Composite Waterproofing and Anticorrosion Method in accordance with PE Fiber Reinforcement. Test results, A Bond Performance of the Test Specimen was confirmed to have increased 37.5%. By PE Fiber Reinforcement.

For reinforced soil slopes with anchors, additional slope reinforcement using anchors is highly difficult due to their interference with previously installed anchors. This case study presents the applicability of high pressure jet nail for the reinforcement of slopes where additional reinforcement is needed due to the loss of tensile force in the anchors.

Prevention methods for lateral movement of abutment include increasing the bearing capacity of foundation, improving the soft ground and reducing the external loads. These methods are usually adopted prior to the bridge construction. However, it is not easy for them to be applied to the bridge during common use. Because they are not only difficult to be constructed, but also potential causes of stability of the bridge. Instead, counterweight fill, grouting and permanent anchorage can be considered as alternatives when the lateral movement of abutment occurs. Among them, grouting has been adopted a lot recently. In this study, analysis is carried out to review the reinforcement effect of grouting method.

This paper presented to study used Abaqus on steel plate bonded reinforcement technology for column to beam connections, and then the result showed that steel plate bonded reinforcement technology has great reinforcement effect for RC column to beam joint. Also the steel plate bonded reinforcement technology was safety and convenient operation.

Highway construction to the reinforced earth retaining wall which is under constant traffic load there is a possibility of generating the displacement at the top. In this study, it was conducted determine how to repair reinforcement method through examination of cause and stability analysis when occurs the displacement of reinforced earth retaining wall.

Existing nondestructive test methods used to measure reinforcement corrosion is based on qualitative measurement of corrosion, and it has many difficulties of use because many equipment and measurement stages are required for application at actual sites. Accordingly, this study was conducted to estimate reinforcement corrosion of concrete structures using infrared thermography method as a method of measuring reinforcement corrosion in concrete. As for the specimen was to measure reinforcement corrosion, D13 reinforcement with size of 200×150×180mm was buried at length of 250mm for covering depth of 20mm and 40mm. Accelerated reinforcement corrosion test was carried out after placement of concrete. As a result of measuring reinforcement corrosion using infrared thermography method, temperature difference of 1~3°C was shown depending on the corrosion stage. There was a correlation in which temperature decreased according to chloride content. Infrared thermography method was confirmed as a useful method for measurement of reinforcement corrosion inside concrete.

기존 고속철도 자갈궤도구간에서는 궤도 비틀림 현상이 발생하여 안전 위협, 승차감 저하, 유지 및 보수 비용증가, 유지 및 보수 작업으로 인한 열차운행 지연 등의 문제점이 발생하고 있는 실정이다. 궤도구조 개량공사는 열차차단 시간 내에 공사를 완료하고 공사 후 궤도에 대한 구조적인 안전성도 확보해야 한다. 이를 해결하기 위하여 열차차단 시간 내에 궤도 구조를 개량 할 수 있는 급속경화궤도 기술개발에 대한 연구가 진행되고 있다. 급속 경화궤도는 일반 자갈도상궤도를 콘크리트 슬래브화 시키는 공법이며 기존의 콘크리트궤도와 상이하게 철근이 사용되지 않고 자갈과 초속경 모르타르로 구성되어있다. 국내 고속철도에서 콘크리트경화궤도의 시공이음부에서 구조적 문제가 다수 발생하고 있다. 본 연구는 급속경화궤도 시공 시 발생하는 시공이음매에 대한 보강방안으로 자갈맞물림(Aggregate interlock), Dowel bar, Dowel plate, 지오그리드로 매개 변수화하여 급속경화궤도 시공이음부 보강구조의 성능 검증 실험을 수행한다. 이를 통해 급속경화궤도 슬래브 간에 하중전달효율을 분석하고 급속경화궤도 시공에 적합한 방안을 도출하고자 한다.

This paper introduce a reinforcement method for vertical extension of a building using a rahmen frame structural system. This approach has to be carried out by considering the structural safety due to the additional weights being exerted to the pre-existing building. The connections to fasten both the rahmen frames and original building were designed with the axial loads and moments acting on the rahmen frame structural system, that is extended vertically. This system reduces the structure self-weight and ensures non-additional of reinforcement.

On this study, the laboratory model test is a soil tanker to be contained with clay and grid form improved soil, the test model is conducted in total 9case with the uniaxial compressive strength of improved soil and replacement ratio of improved soil. Numerical analysis for variation of stress distribution ratio with depth is performed in the same conditions which are the laboratory model test. As a result, stress distribution ratios in mid and high replacement ratio are increasing and settlement is decreasing, except low replacement ratio. This study is presented for form effect ratio and settlement reduction factor with change of structure form, it is able to be helpful in further research and reference for change of structural forms at composite ground.

This study introduces the hysteretic behavior of RC column retrofitted with SRF(Super Reinforcement with Flexibility) method, which was developed for the purpose of enhancing the deformability of shear critical RC members. Hysteresis model of the retrofitted RC column is proposed to reproduce the experimental results showing strength deterioration and reascending branch in its hysteretic behavior.

The natural hazard occurrences such as landslides, debris flows and natural/artificial slope failures were mainly caused by typhoons and extremely heavy rainfall. In order to reduce these natural hazards the efficient countermeasure methods were need to reduce the landslide and debris flow caused by variations of precipitation patterns. The positively countermeasure coping with the debris flow hazards should have to estimate mainly progress to construction of barrier facilities based on the predicted results of potential hazard types and its scales as well as establish and enforce actively maintenance of the barrier facilities. In addition we also emphasized the necessary to the types of barrier facilities and institution improvement in order to positively hazard reduction of debris flow.

콘크리트 구조물 내의 철근탐사는 구조물의 상태를 평가하는 가장 중요한 단계중의 하나이다. 콘크리트 내의 철근 탐사 장비는 전자파레이더법과 전자기 유도법의 원리를 적용하고 있으며, 본 연구에서는 두 가지 원리를 적용한 비파괴시험장비의 철근직경, 피복두께 및 습윤상태에 따른 철근탐사 신뢰성을 시험적으로 분석하였다. 시험에는 1,000mm(길이)×300mm(폭)인 9개의 콘크리트 시험체가 이용되었으며, 시험체내 철근의 피복두께는 45, 60, 100mm로 변화시키고 배근간격은 100mm이상으로 하였다. 시험결과, 전자기 유도법의 경우, 철근직경이 커짐에 따라 오차가 증가하는 것으로 나타났다. 그 반면에 전자파레이더법의 경우, 실제 피복두께에 맞는 비유전율에 따라 계측하여 깊은 심도의 경우에도 신뢰성이 우수한 것으로 나타났다.