• Title, Summary, Keyword: expansion joint

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Propriety Examination of Expansion Joint Spacing of Airport Concrete Pavement by Weather and Material Characteristics (기상과 재료 특성에 의한 공항 콘크리트 포장 팽창줄눈 간격의 적정성 검토)

  • Park, Hae Won;Jeong, Jin Hoon
    • International Journal of Highway Engineering
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    • v.20 no.3
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    • pp.65-73
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    • 2018
  • PURPOSES : In this study, the propriety of expansion joint spacing of airport concrete pavement was examined by using weather and material characteristics. METHODS : A finite element model for simulating airport concrete pavement was developed and blowup occurrence due to temperature increase was analyzed. The critical temperature causing the expansion of concrete slab and blow up at the expansion joint was calculated according to the initial vertical displacement at the joint. The amount of expansion that can occur in the concrete slab for 20 years of design life was calculated by summing the expansion and contraction by temperature, alkali-silica reaction, and drying shrinkage. The effective expansion of pavement section between adjacent expansion joints was calculated by subtracting the effective width of expansion joint from the summation of the expansion of the pavement section. The temperature change causing the effective expansion of pavement section was also calculated. The effective expansion equivalent temperature change was compared to the critical temperature, which causes the blowup, according to expansion joint spacing to verify the propriety of expansion joint applied to the airport concrete pavement. RESULTS : When an initial vertical displacement of the expansion joint was 3mm or less, the blowup never occurred for 300m of joint spacing which is used in Korean airports currently. But, there was a risk of blow-up when an initial vertical displacement of the expansion joint was 5mm or more due to the weather or material characteristics. CONCLUSIONS : It was confirmed that the intial vertical displacement at the expansion joint could be managed below 3mm from the previous research results. Accordingly it was concluded that the 300m of current expansion joint spacing of Korean airports could be used without blowup by controling the alkali-silica reaction below its allowable limit.

Study on Optimum Shape of Expansion Joint (신축조인트의 최적화형상에 대한 연구)

  • Han, Moonsik;Ahn, Junghyun;Yang, Chulho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.2
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    • pp.154-158
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    • 2013
  • Expansion joint has been utilized in many areas including automotive bellows for exhaust system. Usage of expansion joint has been increased due to its inherent flexibility and excellent anti-vibration property. Simple shape of expansion joint is modeled to understand the behavior of joint system. 27 design cases using 3 design factors with 3 levels are constructed by design of experiment. Each case is simulated to find the most influential design factors. Response for this study, maximum stress in the expansion joint, has been used to determine main design factors of joint. Among the 3 design factors, factor B has affected greatly a response in the formation of optimum shape of joint. Also, interaction factor, $A{\times}B$, has also showed its influence to the response of joint. This study showed that design of experiment combined with finite element analysis could be used in the design decision process effectively in the design of expansion joint.

A Case Study on the Effect of Damaged Expansion Joint for Safety Assessment of Highway Bridges

  • Kim, Kwang-Il;Chai, Won-Kyu;Lee, Myeong-Gu;Son, Young-Hyun
    • International Journal of Safety
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    • v.9 no.2
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    • pp.16-21
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    • 2010
  • In this study, the variations of transformed impact factors and load carrying capacity of highway bridges measured from the state of expansion joint are evaluated. the field loading tests were performed on the highway bridge with damaged expansion joint to investigate the variation of the load carrying capacity. From the field loading tests in case that damaged expansion joint exist or do not exist, the static displacements and dynamic displacements were measured, and TIF were calculated, respectively. dynamic test is performed in order to estimate dynamic displacement and TIF according to the level of damage of expansion joint. From the results of TIF, the load carrying capacity of highway bridges with damaged expansion joint were estimated.

Durability Test for the Expansion Joint of High-Speed Railway Bridge (고속철도 교량 신축이음장치의 내구성 실험)

  • 김병석;곽종원;신호상;김영진;박성용;장익순
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.894-899
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    • 1998
  • To absorb the deformation of live load, thermal gradient, shrinkage and creep in bridge structures and general structures, expansion joint has to be established. Especially expansion joint for high-speed railway bridge has to accomodate the static and dynamic forces and it not only has the durability of itself but also maintain the durability of structure by preventing the leakage of water. The actual used product of expansion joint for high-speed railway bridge is only ones made in France, Germany and Japan. In this study, the development process and test results of developed expansion joint are introduced which has the functional operation and durability enough to apply to high-speed railway bridges, roadway bridges and general structures. The tests consist of fatigue-durability test of 3 million times by high-speed rail load, leakage test and jack-up test for verifying the possibility of exchanging it. The performance of developed expansion joint satisfy the specification of Korea High Speed Rail Construction authority.

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An Experimental Study on the Waterproofing Performance of Expansion Equipment for Underground Structures (지하구조물용 신축이음장치의 방수성능에 관한 실험연구)

  • Lee, Young-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.9
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    • pp.4302-4309
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    • 2012
  • Underground structures without the expansion joint in the settled intervals, the underground structures may suffer from structural crack and the water leakage thereby resulting in the occurance of the efflorescence. In this study, the performance of new expansion joint used in underground structures were verified. The spacing of expansion joint was defined by the finite element analysis. Expansion length, resistance and waterproofing performance of developed expansion joint were confirmed by experiment.

Durability Evaluation of a Buried Expansion Joint of Buried Folding Lattice Type (BFL형의 매설형 신축이음장치의 내구성 평가)

  • Jwa, Yong-Hyun;Park, Sang-Yeol;Kim, Seok-Hyun
    • International Journal of Highway Engineering
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    • v.13 no.2
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    • pp.9-20
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    • 2011
  • Most of domestic expansion joint system was applied by exposed expansion joint system. There are cases where it is damaged by driving. As the result noise and impact happened, and the social cost due to frequent repair works is increasing. So based on the Asphalt Plug Joint(APJ) system that applied in the United States and Europe, new buried expansion joint system was lately developed a system of Buried Folding Lattice Joint(BFLJ) that changed substructure. In this research, we have tested for durability and flexibility performance of buried expansion joint system that based on the type of asphalt mixture. Also we have evaluated for durability of BFLJ system against vehicle load using accelerated pavement testing. As a result of the experiment, the developed BFLJ system gives high flexibility performance and resolves transformation concentration along the joint section more than APJ system. Also it could be seen that the BFLJ system could overcome the disadvantages of APJ and prevent early damage. Because surface deflection of BFLJ system against vehicle load was measured low, and sub system in the buried expansion joint system was not damaged against vehicle load.

Rapid full-scale expansion joint monitoring using wireless hybrid sensor

  • Jang, Shinae;Dahal, Sushil;Li, Jingcheng
    • Smart Structures and Systems
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    • v.12 no.3_4
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    • pp.415-426
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    • 2013
  • Condition assessment and monitoring of bridges is critical for safe passenger travel, public transportation, and efficient freight. In monitoring, displacement measurement capability is important to keep track of performance of bridge, in part or as whole. One of the most important parts of a bridge is the expansion joint, which accommodates continuous cyclic thermal expansion of the whole bridge. Though expansion joint is critical for bridge performance, its inspection and monitoring has not been considered significantly because the monitoring requires long-term data using cost intensive equipment. Recently, a wireless smart sensor network (WSSN) has drawn significant attention for transportation infrastructure monitoring because of its merits in low cost, easy installation, and versatile on-board computation capability. In this paper, a rapid wireless displacement monitoring system, wireless hybrid sensor (WHS), has been developed to monitor displacement of expansion joints of bridges. The WHS has been calibrated for both static and dynamic displacement measurement in laboratory environment, and deployed on an in-service highway bridge to demonstrate rapid expansion joint monitoring. The test-bed is a continuous steel girder bridge, the Founders Bridge, in East Hartford, Connecticut. Using the WHS system, the static and dynamic displacement of the expansion joint has been measured. The short-term displacement trend in terms of temperature is calculated. With the WHS system, approximately 6% of the time has been spent for installation, and 94% of time for the measurement showing strong potential of the developed system for rapid displacement monitoring.

고속철도 교량 신축이음장치의 내구성 실험

  • 김병석;곽종원;신호상;김영진;박성용;장익순
    • Proceedings of the KSR Conference
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    • pp.24-29
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    • 1998
  • To absorb the deformation of ,external live load, thermal gradient, shrinkage and creep in bridge structures and general structures, expansion joint has to be established. Especially expansion joint for high-speed railway bridge has to accomodate the static and dynamic forces and it not only has the durability of itself but also maintain the durability of structure by preventing the leakage of water. The actual used product of expansion joint for high-speed railway bridge is only ones made in France, Germany and Japan. In this study, the development process and test results of developed expansion joint are introduced which has the functional operation and durability enough to apply to high-speed railway bridges, roadway bridges and general structures. The tests consist of fatigue-durability test of 3 million times by high-speed rail load, leakage test and jack-up test for verifying the possibility of exchanging it. The performance of developed expansion joint satisfy the specification of Korea High Speed Rail Construction Authority.

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Anchor system in order not to Unscrew of Expansion Joint for Bridge (신축이음장치에서 나사 풀림을 방지하기 위한 앵커시스템)

  • Ha, Sang-Su;Choi, Dong-Uk;Lee, Chin-Yong
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.793-796
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    • 2008
  • The failure of expansion joint for bridge is generally occurred on the non-shrinkage mortar and other problem is the release of anchors in expansion joint due to the impact and vibration during the driven car on the bridge. In this study, to overcome the failure of expansion joint by the failure of non-shrinkage, the elastomeric mortar is developed. The pull-out capacity developed elastomeric mortar compared with that of non-shrinkage mortar. Moreover the anchor system which can be change easily and prevent a fracture of expansion joint is developed.

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The Effect of the Tied Sleeper on the Maintenance Work in the Rail Expansion Joint Zone (레일신축 이음부 유지보수 작업에 대한 침목결속의 영향)

  • Bae, Hyun-Ung;Kang, Tae-Ku;Choi, Jin-Yu;Jeong, Won-Ik;Lim, Nam-Hyoung
    • Proceedings of the KSR Conference
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    • pp.2125-2128
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    • 2011
  • The continuous welded rail(CWR) track without the rail expansion joint has many advantages over the conventional track in a variety of fields including the speed-up and the ride comport. However, due to the excessive axial force in the CWR and the track-bridge interactive behavior, inevitably, the rail expansion joint must be installed at the vulnerable zone such as the bridge end zone, etc. In this rail expansion joint zone, the frequency of the maintenance work to repair the track irregularity is on the rise. This is because that the creep of the sleeper is occurred in the moveable zone of the rail expansion joint. In this study, among the several options for reducing the track irregularity on the rail expansion joint zone, the application and efficiency of the tied sleeper is investigated. Field test construction has been conducted, then the progress of the track irregularity and the frequency of the maintenance work are analyzed before and after the filed test construction.

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