교량의 신축이음장치는 상부구조의 온도신축 이동 및 회전을 원활하게 수용하기 위하여 설치하는 부속장치 중의 하나이다. 따라서 계절에 따른 즉, 온도 변화에도 적정 유간을 확보하여 교량의 설계시의 구조적 거동을 유지하는 데에 그 중요성이 있다 하겠다. 그러나, 최근 잦은 이상기온(폭염) 지속, 교대 지반이동, 접속부 콘크리트 포장 팽창 등 여러 요인으로 신축 이음장치 유간의 부족 현상이 관찰되고 있다. 이는 Blow up, 교량 구조적 손상으로 이어지게 되므로 모니터링을 통하여 선제적 유지관리가 가능하도록 ‘무차단 교량 신축이음장치 유간 조사 장비(이하, NEXUS)를 개발하여 실용화 중에 있다. 본 연구에서는 온도 변화에 따른 유간을 NEXUS 장비를 활용하여 조사하여 그 거동특성을 살펴보고자 하였다.

교량의 시공기술 발달에 따른 다양한 교량의 건설과 교통량의 증가에 따른 내구성 및 유지보수의 중요성이 크게 부각되면서, 이와 같은 요구조건을 충족시킬 수 있는 신축이음장치의 개발이 요구되고 있다. 또한 최근 기후온난화로 인한 여름철 도로 블로우업 현상에 기인한 신축이음장치의 하자가 최근 발생하고 있는 실정이다. 신축이음장치는 교량형식 및 제원, 교통량, 보수, 교체성 및 강설량 등에 따라 점차 다양해지고 기술이 집약화되고 있으나, 아직까지 모든면에서 완벽한 신축이음장치는 없으며, 각 형식에 따라 장단점이 존재한다. 본 연구에서는 기존 강재형 신축이음장치가 아닌 저온·고온에 성능에 우수 한 탄성아스팔트 바인더 혼합물에 응력분산을 통한 균열에 효과적인 신축보강재를 복합 구성하여 프리캐스트방식으로 공장에서 제작하여 현장에 적용 빠른 시간내 시공이 가능하도록 신축이음장치를 제작하여 이를 연구·평가하고자 한다

내진 성능 학보를 위해서는 신축이음장치가 지진력에 대하여 적절한 변형이 발생하여 신축이음장치의 파괴를 방지하여야 하는데 최근에 국내에서 신축이음장치의 핑거부에 힌지를 설치하여 교축방향의 지진력에 대한 변위 저항성을 확보한 신제품이 개발되고 있다. 이에 본 논문에서는 가변형 핑거 조인트를 가지는 신축이음장치에 대하여 실물규모의 교축직각방향 하중에 대한 저항성을 실험적으로 평가하였다. 실험결과, 최대 수평변위는 기존 신축이음 실험체의 경우 약 21.1mm, 내진 신축이음 실험체의 경우 51.00mm로 나타났으며, 기존제품은 추가적으로 16.5mm의 솟음이 발생되었다. 기존 신축이음 실험체는 어느 정도의 교축직각 방향의 하중에 대하여 저항한 후, 핑거의 휨 및 전단 변형이 과도하게 발생되며 파단 현상이 발생할 가능성이 있을 것으로 추정된다. 반면에 내진 신축이음 실험체의 경우, 교축 직각방향의 하중에 대하여 하중에 대한 변형을 핑거의 힌지가 흡수하여 신축이음장치 및 상부구조에 응력을 발생시키지 않고 다만 하중 작용방향으로의 수평 변형만 발생시킬 것으로 예상된다.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling 100km/h.

This guideline refers to expansion joints with a diameter of 300mm or more. It will check the condition of large-capacity expansion joint, detect abnormal behavior and damage early, take appropriate measures such as repair and replacement, and secure user's safety and smooth traffic flow. And to provide the basic data necessary for the maintenance work of the management subject to be carried out for the purpose of To this end, we investigated and analyzed the existing joint damage, repair and replacement cases, suggested proper repair and replacement methods and preventive maintenance plan.

In this study, the partial correlation between the expansion and the vertical displacement excluding the temperature and the correlation between the expansion and vertical displacement and the average temperature of the reinforced truss member was analyzed. The correlation coefficients between temperature and expansion, temperature and vertical displacement were .929 and .874, respectively. The correlation coefficient between vertical displacement and expansion was 0.860 and partial correlation coefficient excluding temperature effect was 0.268.

The refraction expansion joints have been newly developed by complementing the problems of shock, noise, replaceability, displacement in the direction perpendicular to bridge, vertical difference, which are problems of existing expansion joints. The Refraction expansion joints are characterized by continuous surfaces with small impact and low noise. The behavior of the Refraction expansion joints performs the bridge expansion behavior by rotation of the link. In the rotational behavior of the link, the bolt is the central axis of the behavior. Therefore, it can be said that the durability of the bolt is very important. However, the theoretical and experimental verification of the bolt durability of the Refraction expansion joint is lacking. In this paper, to verify the fatigue durability of the bolt, test specimens with a 300 mm Refraction expansion joint were fabricated. A strain gauge dedicated to the bolt was installed inside the manufactured test specimen bolt. The test method was applied in accordance with KS F 4425. The fatigue durability of the bolts assembled inside the diaphragm expansion joint was confirmed by the repeated fatigue test of 2,000,000 cycles.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

Three varieties of green pepper - Chungyang pepper, Cucumber-taste pepper and Nokgwang pepper - are competing with one another in consumption due to the overlapping shipment period. The objective of this study is to analyze the influence of monthly variations of shipment quantities on the wholesale market prices. A Linear Approximated Inverse Almost Ideal Demand System (LA/IAIDS) is employed with monthly data set of three different varieties of green pepper consumption. The results show that if there is an excess supply in the market, the rate of the price decline is larger for forcing culture Chungyang pepper than other pepper varieties. On the contrary, change in supply of cucumber-taste pepper and Nokgwang pepper has little effect on the price of Chungyang pepper. The results of this study can be utilized as a basic information for enhancing the farm income and promoting agricultural policies related to the establishment of self-help funds by Chungyang pepper producer groups in Gyeongnam region.

Recently, there has been frequent shortage of expansion joint in expressway bridges. When that happens, maintenance budgets will be overloaded and not effective, so it is not easy to come up with a solution. In this study, we introduce a bridge inspection system that combines laser image sensing technology and automatic control technology, which have been recently applied in various fields. And this system was developed to measure bridge extension joints while traveling more than 80km/h.

Because stage cable-bridge have long spans and large members, their movements and geometrical changes by temperatures tend to be bigger than those of small or medium-size bridge. Therefore, it is important for maintenance engineers to monitor and assess the effect to temperature on the cable-supported bridges. To evaluate how much the superstructure expands or contracts when subjected to changes in temperature is the first step for the maintenance. Thermal movements of a cable-stayed bridge in service are evaluated by using long-term temperatures and displacements data.

This study focused on whether the large-scale expansion joints of the Diamond Bridge, a suspension bridge, is being appropriately and efficiently utilized during maintenance period. In this study, a linear regression model was developed by analyzing long-term monitoring data from the bridge, considering the bridge design standards in Korea and building-related literatures. Then, the reliability of the model was verified through a theoretical review on the relationship between temperature change and expansion joint displacement. The expansion joint displacements of the bridge showed a regular time series graph with temperature change. A linear regression analysis indicated that the slope of the graph was very similar to the displacement of steel due to linear expansion coefficient, with a high determination coefficient (R2=0.979), meaning that the actual behavior of the bridge conforms to the theory. Considering the expansion joint specification of the bridge and existing external loads, actual expansion joint displacement was only 8.5 percent of its specification, so the specification can be adjusted in order that actual expansion joint displacement can be up to 21.6 percent of its specification. In this case, expansion joint cost can be reduced as much as 78.4 percent of its original cost.

논문은 고속도로 교량 하부구조 열화를 가속시키는 요인의 하나인 신축이음장치의 손상 조사를 통하여 현황을 분석하고 개선방안을 제시해보고자 한다.

라돈은 우라늄-238과 토륨-232가 방사성붕괴 과정을 거친 후 생성되며, 무색, 무취의 불활성 기체로서 지하 또는 밀폐된 공간에 축적된다. 우라늄-238과 토륨-232는 지각의 암석이나 토양 등에 포함 돼 있다. 건축자재는 암석이나 토양을 재료로하여 만들어 진다. 가스 형태의 라돈은 호흡기를 통해 폐로 유입되고 라돈의 딸핵종이 폐나 기관지에 침적 되어 폐암을 일으키는 원인이 된다. 본 연구는 광주광역시 광산구에 위치한 신축 아파트를 대상으로 창문을 닫고 열은 상태에서 라돈 측정기를 이용하여 측정하였다. 측정 결과로 보아 신축 아파트 실내 평균 라돈농도는 미국 일반인 공기 중 라돈가스 최대허용농도 기준치 4 pCi보다 이하의 값이 나타난다는 것을 볼 수 있다. 측정 결과로 볼 때 신축 아파트의 라돈농도로 인한 피폭은 크지 않을 것으로 예상한다. 그러나 라돈가스가 신체 내에 축적이 되면 폐와 같은 경우는 폐암과 같은 피폭에 의한 피해를 얻을 수 있으므로 방사선 방어적 측면에서 측정 결과와 같이 라돈 농도를 낮추기 위해 창문을 자주 열어 환기를 시켜 피폭을 줄이는 것이 필요하다고 생각 된다.

Vibration measurement analysis and In-depth inspection were carried out to understand the cause of defects occurred on joint of bridge. A cause of defects, such as metallic sounds, water leak&corrosion and rubber seal rupture turn out to be due to deterioration and vibrating impact by period so that the bridge is in need of repair and effective maintenance.

In this study, We estimated a life time of the expansion joint using survival functions on reliability theory. The sample data were extracted in the Highway Bridge Management System(HBMS). It were about six thousands of bridges from 1999 to 2013. the average life of all the expansion was 16~20years, type and figure type were superior in life.

To evaluate seismic performance of rail type modular bridge expansion joint system with excellent durability and large expansion length, we tested simulation of the seismic behavior in the thesis. Seismic response behavior analysis created artificial seismic wave applying design basis response spectrum from Korea(KS), USA(AASHTO LRFD) and Europe(Eurocode) standards.

This paper reports the result of five type vibration and noise tests to expansion joints. Field tests on the vibration and the noise at expansion joints, rail type and finger type joints which are typical ones in bridge with short or middle span, are performed and performance of expansion joints are analyzed.