교량에서의 후설치 앵커는 시공 중 또는 유지관리시 주요 부재 또는 부대시설의 설치를 위하여 제한적으로 적용되고 있다. 본 고에서는 후설치 앵커를 적용한 대표적인 사례 중 하나인 교량 점검시설의 설계와 시공 사례를 소개한다. 지금까지 교량의 점검시설은 하부구조와 상부구조 콘크리트가 경화된 이후에 앵커 구멍을 뚫은 후 앵커를 고정하는 방식으로 앵커 시스템이 구성된다. 따라서 이러한 시공 과정을 고려하여 설계하고, 시공하게 된다. 그러나 실 교량에서 콘크리트 부재에는 철근이 배치되어 있고, 표면 또한 요철이 있는 경우가 있으며, 작업 여건이 양호하지 않기 때문에 부적절한 시공 사례도 빈번 하게 나타난다.

규모가 큰 지진이 발생함에 따라 발전소 내 비구조요소인 전기설비들이 전도등으로 인한 손상으로 제기능을 하지 못하는 사례가 있어 비구조요소의 고정부에 대한 내진성능평가가 필요하다. 이에 본 연구는 비구조요소의 고정부로 사용되는 후설치 앵커볼트 M10 사이즈를 대상으로 하였으며 균열 발생에 따른 성능을 비교하기 위해 인위적인 균열을 발생시켜 동적인발 성능 평가를 수행하였다. 실험은 ACI 355.2에 근거하여 정적인발성능 실험을 통해 구한 평균 최대하중의 50% 하중 10회, 37.5% 하중 30회, 25% 하중 100회 반복가력 후 정적성능시험을 수행하였다.

A monitoring technique of ground anchor force is now studying by measuring the strains distributed on a bearing plate. These distributed strains are measured by a fiber optic OFDR (Optical Frequency Domain Reflectometer) sensor. A sensing optical fiber was attached on the bearing plate at the two radial locations and tested by a universal test machine. The anchor forces can be calculated from the differences of these two trains.

Most of equipment in nuclear power plants (NPPs) is anchored to the concrete structure or other components with concrete anchors. It is need to be considering the boundary condition by concrete-anchor connection. In this paper, the seismic analysis was conducted varying anchoring type as non-linear stiffness condition from preliminary analysis.

The damage caused by the earthquake is not only the structural damage, but also the damage caused by the functional damage of the non - structural element. However, the criteria for seismic design for non - structural elements such as electrical panels are insufficient compared to those for seismic design for structural damage. In this study, the performance of the anchor bolt connecting between electric panel and concrete slabs installed in a power plant according to the occurrence of crack was investigated by experiment.

The concrete track has been developed as an alternative to the ballast track due to its excellent maintenance. Recently, QHT(Quick Hardening Track) has been developed to rapidly replace ballast track to slab track. In bridge section, post-installation anchors should be installed at the center of QHT segment in order to unify the behavior of bridge and QHT. In this study, track-bridge interaction analysis was performed to check safety of anchor considering at early age of QHT.

In this paper, an experimental design of an experimental study was carried out to evaluate the pullout performance of an cast-in-place anchor. Then, an analytical examination of the planned experiment was carried out. The size of the specimen was determined by reference to the installation depth of the anchor. The test specimens were checked for bending cracks according to design standards. The numerical analysis model was constructed according to the final test plan, and the result of the analysis was that the crack occurred at the center of the section. Therefore, the ultimate specimen which cone fracture of concrete was induced by modeling by reinforcing steel reinforcement on the outside of specimen was planned.

This paper presents the measurement of earth anchor tension using fiber optic OFDR sensor. Fiber optic OFDR sensor was configurated with tunable laser source, APD with polarization beam splitter and high speed DAQ system. Strains of pressure plate and anchor head were measured and compared using strain gage and fiber optic OFDR sensor. Fiber optic OFDR sensor signal showed linear increase in both tension and compression direction as tensional force increase. This results shows the capability of fiber optic OFDR sensor for monitoring earth anchor tension.

Most of systems and components in nuclear power plants (NPPs) are anchored to the concrete structure and other components by means of post installed anchors. In order to develop more accurate seismic analysis model of equipment in NPPs, a deep consideration of concrete-anchor connection behavior is required. In this paper, the nonlinear finite element analysis was conducted for the concrete-anchor connection zone details. From the analysis results including strength and load-displacement relation was derived according to design variables including geometry and material properties.

The purpose of this study is to evaluate the structural safety of anchor bolts used for connecting between H-beam and reinforced concrete, which are considered to be the most vulnerable parts to external loads.

Seismic performance capacity of CFT seismic retrofit method was studied through cyclic loading test. The added CFT columns share the lateral seismic force of the building with the existing RC columns to prevent building collapse. The experiment shows stable hysteric load-displacement curve.

Anchors used in concrete structures are classified into cast-in-place anchors and post-installed anchors. At post-installed anchors, the effective embedment depth, measured from the concrete surface to the deepest point, is an important variable to grasp the performance of anchors. Because effective embedment depth is depth to transmit force to the concrete. In this study, we conducted pull-out test of M12 and M16 post-installed anchors, evaluated the performance of anchors.

Seismic performance capacity of CFT seismic retrofit method was studied through cyclic loading test. The added CFT columns share the lateral seismic force of the building with the existing RC columns to prevent building collapse. The experiment shows stable hysteric load-displacement curve

Anchors used in concrete structures are classified into cast-in-place anchors and post-installed anchors. At post-installed anchors, the effective embedment depth, measured from the concrete surface to the deepest point, is an important variable to grasp the performance of anchors. Because effective embedment depth is depth to transmit force to the concrete. In this study, we conducted pull-out test of M12 and M16 post-installed anchors, evaluated the performance of anchors.

Based on the experiment, characteristic of local stresses and deformation in the anchorhead and wedges with prestressing of PSC slab was investigated in this study. As a result, local stresses exceeded yeild stress in the contacts of anchorhead and wedges and in the lower sides of anchorhead

3 tests are performed to analyze the specific performance and pullout strength of an anchor bolt which has a greater contact area with the concrete. In the case of connecting bar which connect the non-symmetric nuts together, the pullout strength greatly increased than the normal bolt cases.

In this study, wind fragility for anchor systems installed at sign structures was developed through Monte Carlo simulation method. The fragility is a conditional limit state probability, presented as a function of the 3-second gust wind speed, based on a relation between statistics of wind loads and anchor system resistances. Advertisement sign attached to concrete wall structure was investigated using probabilistic approach with consideration of anchor type, exposure category, and wind directionality. The results showed that the failure due to tension on anchor bolt was dominant and occurred at a very high wind speed. The fragility methodology described in this paper can be used to develop performance-based design guidelines for advertisement structure in high wind regions as well as to provide information on which to base structural safety or expected loss assessments.

SIFCON's mechanical properties were investigated experimently to develop for anchor block. A normal concrete was used to compare with SIFCON. As a result, SIFCON has higher strength and toughness those of normal concrete.

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.

To obtain design parameter of soil protection structure having anchor type foundation, model test is executed for flexible and rigid structures. Empirical equation for soil impact force with variation of slope angle and spacing is suggested in this study.