반복하중을 받는 모듈러 슬래브의 거동 및 단면2차모멘트 평가 = Evaluation of Structural Behavior and Moment of Inertia on Modular Slabs Subjected to Cyclic Loading

다국어 초록 (Multilingual Abstract)

Recently, the maintenance activity for aging of bridge structures was difficult because of traffic jam, environment pollution and increasing cost. And to solve these problems, modular bridge research has been studied. After static and cyclic loading test was conducted for serviceability and bending performance with one way slab, effective moment of inertia of modular specimen was analyzed to estimate the deflection by KCI(2012). To conduct the test, one integral slab and three modular slabs were made for static loading and one integral and modular slab were made for cyclic. As a result of the test, the modular slab had the similar bending performance of the integral. But the ultimate deflection showed the insufficient which was smaller than 20%. In the cyclic loading test, the modular slab has different behavior of deflection with the integral, so it was evaluated difficult for serviceability. In addition, effective moment of inertia by KCI(2012) was not estimated for modular slab with connection. The new value of m which was ratio between moments is 4.53 based on result of test for predicting deflection of modular.

국문 초록 (Abstract)

최근 교량의 노후화에 따른 유지관리 활동이 교통체증, 환경오염, 막대한 비용의 소모로 인하여 어려움을 겪으면서 조립식교량 공법을 이용하는 모듈러 교량 연구가 진행 중이다. 본 연구는 모듈러 교량과 관련된 연구의 일환으로 연결부를 가지는 1방향 모듈러 슬래브를 대상으로 반복하중 재하시 단면2차모멘트의 변화를 분석하고 콘크리트구조기준의 유효단면2차모멘트 식과 비교하였다. 반복하중 재하 실험을위하여 일체형, 모듈러 실험체 각각 1개씩을 제작하였다. 실험결과, 모듈러 실험체는 일체형 실험체의 비슷한 휨 성능을 가지고 있었으나, 극한변위는 20% 부족한 모습을 보였다. 반복하중 재하 실험에서는 모듈러 실험체는 일체형 실험체와는 상이한 처짐 거동을 보였고 단면2차모멘트의 변화가 상이하였다. 또한 콘크리트구조기준의 유효단면2차모멘트 계산식은 모듈러 슬래브의 단면2차모멘트를 적절히 반영하지 못하고 있음을 확인하였고, 실험값을 기반으로 하중과 균열모멘트의 비율을 새로운 값인 4.53을 구하였다.

참고문헌 (Reference)

• 1 이영학, "프리캐스트 콘크리트 세그먼트 접합부의 구조거동에 관한 실험적 연구" 한국지진공학회 13 (13): 59-65, 2009
• 2 강주오, "철근콘크리트 보의 균열 폭과 처짐 관계" 한국구조물진단유지관리공학회 14 (14): 184-192, 2010
• 3 김우, "고강도콘크리트 휨 부재의 처짐에 관한 연구" 대한토목학회 22 (22): 631-640, 2002
• 4 신현섭, "격자형 강합성 바닥판 이음부의 휨거동에 관한 실험적 연구" 한국구조물진단유지관리공학회 16 (16): 68-77, 2012
• 5 Issa, M., "Structural Behavior of Single Key Joints in Precast Concrete Segmental Bridges" 12 (12): 315-324, 2007
• 6 Korea Institute of Industrial Technology Evaluation and Planing, "Modular bridge technology development and commercialization mid report" Modular Bridge R& BD 2012
• 7 "Korea Highway Bridge Code"
• 8 Branson, D. E., "Instantaneous and Time-Dependent Deflection of Simple and Continous Reinforced Concrete Beams, HPR Report" 7 (7): 78-, 1965
• 9 Zhu, P. Ma, Z., "Fatigue Evaluation of Transverse U-Bar Joint Details for Accelerated Bridge Construction" 17 (17): 191-200, 2012
• 10 Shah, B., "Experimental Study on Prefabricaated Concrete Bridge Girderto-Girder Intermittent Bolted Connections System" 12 (12): 570-584, 2007
• 11 Al-Shaikh A. H., "Effective of Reinforcement Ratio on the Effective moment of Inertia of Reinforced Concrete Beams" 65 (65): 144-149, 1993
• 12 Al-Zaid R. Z., "Effect of Loading Type on the Effective Moment of Inertia of Reinforced Concrete Beams" 88 (88): 184-190, 1991
• 13 "Concrete Structure Design Code"
• 14 Kim, D. H., "An Experimental Study on Behavior of Top Flange for a modular T Girder Concrete Bridge" Sungkyunkwan Univ 2014
• 15 "Accelerated Bridge Construction Manual"
• 16 Park, J. H., "A Study on the Curvature of Flexural Members with Connection in Cyclic Load" Sungkyunkwan Univ 2015
• 17 "2013 Report Card for America’s Infrastructure"