PSC girder bridges, widely applied to bridge and railroad bridge (25 ~ 50 m), are a type of bridge that introduces compressive force in advance to the part where tensile force of concrete is generated. The tension force for introducing the compressive force by inserting the tendon into the concrete is a key element of the structural performance in the PSC. At present, however, measurement and verification of this is indirectly managed through deflection and cracking. However, it has become more necessary to develop practical evaluation methods of prestress force of PSC bridges. In this experiment, a small scale PSC beam with various curvature radii was made. Tension force monitoring with FBG sensor and EM sensor was performed on test members using 3 point flexural loading test. The measured values of the FBG sensors and the EM sensors used in the experiment were analyzed and compared with the measured values of the load cell.

Dowel rebar is key parameter to control the lateral displacement in the sliding slab track. The lateral support block of the sliding slab track is supported by the dowel rebar. In this study, selected parameter (rebar diameter) was expected to affect the performance and behavior of the dowel rebar in the sliding slab track. Furthermore, evaluation of the shear behavior of dowel rebar compared to the results of the Soroushian et al. (1986) and CEB-FIP (2010).

As public service life of PSC bridges is on the increase, lots of effort has been devoted to verify safety of PSC bridges. On the safety of PSC bridges, effective prestress force is one of the most important factors. At the moment, however, indirect measurements are mostly employed to evaluate the effective prestress force during and after construction. In this study, performances of FBG and EM sensors, which can directly measure the effective prestress force, are tested and investigated.

Steel box girder has not only an excellent constructability but is also a lightweight structure. Compression flanges of steel box girder under negative moment need stiffeners to increase buckling strength, thereby increasing the construction cost. In this study, compression flanges using trapezoidally bended plates were investigated to replace existing flat flanges.

Recently, many researches have been conducted to use FBG seonsors in order to measure the effective prestress force in a PSC girder. FBG sensors can be useful to investigate transfer length in prestressed concrete members since they do not have any effect on the bond mechanism between a tendon and concrete. In this research, an experimental program has been conducted to measure transfer length of tendons in high strength concrete members by using FBG sensors. The test results showed that FBG sensors gave a transfer length similar to that measured by concrete surface gauges, but they gave more stable results. This research can be useful for relevant areas such as investigation on the bond mechanism of a tendon in high strength concrete members.

A PSC girder with I-typed section is one of the most common types applied to road and rail bridges in South Korea. As public service life of PSC bridges is on increase, lots of effort has been devoted to verify safety of PSC bridges. On the safety of PSC bridges, effective prestress force is one of the most important factor. At the current time, however, indirect measurements are mostly employed to measure the effective prestress force during construction. In this study, performances of FBG and EM sensors, which can directly measure the effective prestress force, are tested and investigated. The test result can be useful to develop block-out PSC girders with FBG and EM sensors monitoring effective prestress force during service life.

연구는 자기조절 초점에 따른 목표추구 행동의 차이를 알아보고자 하는 것이다. 자기조절 초점은 Higgins(1998)가 제시한 증진초점(promotion focus)과 예방초점(prevention focus)을 사용하였으며, 목표추구행동은 Bagozzi, Baumgartner, Pieters(1998)의 목표지향적 정서(goal-directed emotion) 모델을 설정하였다. 이러한 연구목적을 달성하기 위해 고등학교 운동선수를 모집단으로 하여 총 15개의 운동 종목 총 455명을 표집하였다. 본 연구의 조사도구는 자기조절 초점 척도와 목표지향적 정서 척도를 사용하였으며, Higgins(1998)와 Bagozzi 등(1998)이 사용했던 것을 본 연구의 목적에 맞게 수정 및 보완하여 사용하였다. 연구 절차는 먼저 측정 도구를 개발하였고, 그 후 시합이 있기 2～3주전에 자기조절 초점 척도와 목표 확립, 기대 정서, 의지 과정의 목표지향적 정서를 측정하였으며, 시합이 끝난 1주 이내에 도구 행동, 목표 획득, 목표-결과 정서의 목표지향적 정서를 측정하였다. 자료분석은 상관관계분석과 독립 표본 t검증을 실시하였다. 자기조절 초점을 두 집단으로 구분하고, 이에 따른 목표지향적 정서의 평균 차이를 검증한 결과, 쾌의 기대 정서와 의지 과정에서 통계적으로 유의한 차이가 나타났다. 또한 불쾌의 기대 정서와 목표 달성을 제외한 모든 차원에서 증진 초점이 예방 초점보다 높은 평균값을 나타냈다. 이 결과는 Higgins(1998)의 예언과 일치하는 것이다. 그리고 자기조절 초점에 따른 목표-결과 정서간의 평균 차이 검증에서는 예방 초점이 목표 달성을 실패했을 때 나타나는 초조 정서에서만 통계적으로 유의한 차이가 나타났다. 그러나 평균값에서는 예방 초점이 증진 초점보다 모든 차원에서 높은 수치를 나타냈다. 이 결과에 대해 한국의 운동 선수들이 예방 초점과 증진 초점간에 상대적으로 강하거나 약한 측면에서 논의하였다.