경제성장 및 물류증가로 인하여 장대교량에 대한 수요가 증가하고 있다. 장지간을 가진 교량 건설을 위해서는 자중 감소가 필수적 이며, 이를 위한 노력의 일환으로 초박층 포장재에 대한 연구 및 개발이 진행되고 있다. 국내 설계기준을 살펴보면, 이전 도로교설계기준(2010) 에서는 포장이 가지는 강성을 강바닥판에 고려하지 않아 보수적인 설계가 이루어져 왔으나, 최근 개정된 설계기준인 도로교설계기준(2012, 한 계상태설계법)에서는 일정한 조건 하 포장이 가지는 강성을 강바닥판에 반영하는 것을 허용하고 있다. 하지만 초박층 교면포장이 강바닥판에 미치는 영향에 대한 연구는 미비한 실정이며, 진행된 연구 또한 거동 특성 및 피로응력에 대한 연구로 한정되어 왔다. 본 연구에서는 포장강성 의 반영/미반영, 교면 포장재료, 포장 두께 및 강바닥판 두께를 매개변수로 하여 이에 따른 강바닥판의 처짐과 전단응력의 변화 및 추세를 알아 보고 또한 이를 바탕으로 강바닥판에 초박층 교면포장 강성 적용의 효율성을 알아보았다.

Recently efficient maintenance technology has been rising because of the structural deterioration. Specific technology development and research related to the real-time monitoring has been conducted in various ways. All-in-one enclosure including GPS was fabricated to measure the displacement of the retaining wall structure exposed the extreme environment such as very high and low temperature. Also it measured the displacement of the structure under the phased construction.

Presently, the wind power tower grows actively in all countries of the world as the part of renewable energy securing. Recently, as to the wind power tower, the advance to and diversification of the wind power tower form and material are made. but the maintenance manual about the wind power tower in which this foundation is based is insufficient. therefore, the object is that in being safe and maintaining efficiently the wind power tower, by developing the maintenance manual about the fundamental vulnerable element the life span improvement of the wind power tower is planned and it contributes to the maintenance management technology development.

Base on Korean design code, previous design code had not considered the effect of pavement on the orthotropic steel deck, however recent design code(Limit State Design Method, 2012) allowed to consider the effect of pavement on the orthotropic steel deck, and efforts to apply the stiffness of pavement to the deck continue. Meanwhile, research on the effect of ultra thin bridge deck overlay on the orthotropic steel deck is inadequate, previous study was limited in about fatigue stress and performance between pavement layer and the orthotropic steel deck. In this study, according to changing of pavement layer stiffness application, pavement materials, pavement thickness and steel deck thickness, analysis of shear stress. In addition to base on this result, consider effectiveness of ultra-thin pavement stiffness application on the orthotropic steel deck.

Many industries put emphasis on Environment-Friendliness as environmental problems are on the rise all over the world. Among themselves the Modular Bridge research is going on. Also performing cross-section optimization and duration reducing, this research aims at developing the modular bridge with Environment-Friendliness and economic feasibility. However, The difficulty lies in verifying environmental effectiveness because there is no field applications of the modular bridge until now. Therefore, this thesis is 40m bending steel girder modular bridge CO2 emission quantification per work type and materials according to each form to verify environmental effectiveness of the modular bridge.

최근 구조물의 노후화에 따른 급속 교체, 교통 영향 및 환경 영향 최소화의 요구에 따라 프리캐스트 기술을 활용한 모듈러 교량 연구가활발하게 진행중에 있다. 본 연구는 모듈러 교량과 관련된 연구의 일환으로 모듈러 슬래브 교량의 횡방향 연결부를 대상으로 반복하중 재하 실험을 통하여 횡방향 연결부의 반복 하중에 따른 구조적 거동 특성을 파악하고 사용성 평가하였다. 반복하중의 크기를 결정하기 위하여 RC 보를 1개 제작하였으며 반복하중 재하 실험을 위하여 일체형 RC 보 1개와 분절형 실험체 3개를 제작하였다. 실험결과, 분절형 실험체는 하중 반복 횟수가 증가함에 따라 처짐 및 균열폭이 거의 일정하거나 수렴하는 경향을 나타냈으며, 일체형 RC 보와 비교하여 최대처짐, 잔류처짐, 균열폭 모두 작게 나타났다. 또한 사용하중을 반복 재하한 실험체의 경우, 처짐 및 균열에 대한 사용성 기준을 모두 만족하였다.

The performance of the connection in precast members that were made by accelerated construction was performed. In result, behavior of INT-1 and SEG-1 specimens was different. Therefore, in thin study, design of concrete in Korea and experiment result were compared to verify behavior of SEG-1.

Currently, global warming problem is serious. One of reasons of global warming is CO2 emissions. As an alternative means to prevent this, there is an environment-friendly effect of modular bridge method. After analyzing the CO2 emissions of the steel modular bridge which is used in a modular bridge based on D/B W.B.S analysis program and by comparing the CO2 emissions with that of the similar type of bridge, it is intended to analyze the environmental-friendly of modular bridge through the evaluation of the CO2 emissions of modular steel girder bridge of 21m.

본 연구에서는 초박층 교면포장으로 폴리설파이드 에폭시 폴리머 콘크리트 포장을 선정하여, 에폭시 아스팔트 포장, SFRC 포장과의 비교 분석을 통해 폴리머 콘크리트 포장이 강바닥판의 피로응력범위에 어떠한 영향을 미치는 지 분석하였다. 강바닥판의 피로응력범위를 산정하기 위해 Abaqus를 사용한 유한요소해석을 사용하여 비교평가하였으며, 용접부에 교축방향 및 교축직각방향의 다축응력이 발생하는 점을 감안하여 Signed Von-Mises 응력을 도입하여 피로 검토에 활용하였다. 강바닥판의 피로응력범위를 산정하기 위해 Abaqus를 사용한유한요소해석을 사용하여 포장 재료 및 두께에 따라 비교평가하였으며, 용접부에 교축방향 및 교축직각방향의 다축응력이 발생하는 점을 감안하여 Signed Von-Mises 응력을 도입하여 피로 검토에 활용하였다.

This study was conducted to investigate the Structural Health Monitoring(SHM) system built in large-scale structures. Recently large-scale structures such as bridges and high-rise building have installed SHM system and using the SHM system, large-scale structures are monitoring the status of structures. In many practical cases, SHM systems are used sensor, such as strain gauge, inclinometer, accelerometers, seismic, wind anemometer, GPS, to monitor status of structures. This case study foreground potential future research dealing with SHM system using integrated sensor module.

In this case, for PSC Box girder bridge of representative bridge types at the Honam high-speed railway section to need in-depth analysis of the dynamic behavior of the structures in high-speed driving and the monitoring system require to check correct behavior of the actual status of high-speed railway bridge, the dynamic behavior of the bridge was analyzed to HEMU-430X load. According to the high-speed driving test, the main behavior was monitored and analyzed.

This research was performed to improve the bond strength of polymer concrete in the longspan bridge. Specimens were designed to 3 types; steel deck, steel deck attached dump and welding. In conclusion, Welding and dump type is higher than steel deck. Also, steel deck attached dump or welding to be arranged by 160mm is more effective than the others.

This reasearch was performed to evaluate CO2 emission of Modular bridge quantitatively. Preferentially, Modular bridge was separated steel girder bridges, concrete girder, concrete slab bridge and analyzed process in doing configuration W.B.S system. According to the Ministry of land guidelines, each process was divided into material, transportation, construction and calculated by division in detail the materials and fuel so it planned that quantitative assessment can be achieved.

Transverse joints on upper flange of modular T-shaped girder bridge are composed of lapped splice and in-situ high strength concrete. Optimal shape induced by finite element analysis through the shape parameters.

The object of this study is to evaluate static behavior of transverse connection of slab-type modular bridge. Especially, this paper focus on evaluation that shear key and tendon force affect bending strength of transverse connection of slab-type modules. We compared and examined the bending performance of connection through a structural test (4-point bending test). This experimental results show that bending strength of transverse connection of slab-type modules are influenced a number of shear key and amounts of tendon force. So in order to apply to modular construction, it is necessary to research in connection of slab-type modules.

The objective of this study is to evaluate fatigue behavior of transverse connection of girder-type modular bridge. In order to evaluate fatigue behavior, a integral specimens and one segmental specimens were applied fatigue load ranging between 10% and 60% maximum static load with 200000 cycles. In order to test the serviceability, another segmental specimens was applied a fatigue load ranging between 10% and 100% service load with 2 million cycles. The results showed that the segmental specimens had enough safety and serviceability under fatigue load.

During modular bridge construction, the construction delay and the problems of workability due to the high-altitude operations are occurred by using in-site concrete diaphragm. To solve these problems, selected alternative suitable for modular bridge diaphragm is needed. Therefore, in this study, to select the suitable diaphragm for modular PSC T-Girder bridge, seven diaphragm specimens were fabricated and static loading tests were carried out. Through the static load tests, the behavior of diaphragm in terms of joints and load distribution was observed and experimental results were analyzed and compared with each data. Finally, the alternative of suitable diaphragm for modular PSC T-Girder bridge was proposed considering the structural performance and workability.

This research was performed to evaluate physical properties of polysulfide epoxy overlay material for bridge deck, as part of a review for possibility of domestic of epoxy polymer concrete binder for thin bridge deck pavements. After mix test, carry out experiment such as harden, viscosity, tensile, compressive strength and Ultraviolet ray test for evaluate strength and durability characteristics. The tests showed that the results, met the criteria suggested by the ACI in hardness, viscosity, tensile strength and compressive strength. Furthemore, a comparsion of the in this study and goods of Transpo.co in USA, this study were excellent.

In this study, the strut-tie model used for the analysis and design of the anchorage zone of the PSC modular bridge by comparing with the result of the approximate analytical method. The result shows that the bursting force obtained by approximate analytical method were increased about 2 times in comparison with the result of strut-tie model.

The purpose of this study is to propose the decision making code of need for repair and strengthening in concrete bridges. First, to propose the decision making code, the guidelines and codes for a decision making of repair and strengthening and state assesment in United States and Japan were investigated and analyzed. Based on the investigated and analysis data, The decision making code of need for repair and strengthening that is divided into seven kinds of deterioration and damage is proposed. Through the proposed codes, rational and objective decision making of need for repair and strengthening is expected.