지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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PURPOSES : The purpose of this study is to analyse the longitudinal steel strain and stress of continuously reinforced concrete pavement(CRCP) with longitudinal and transverse direction at early age using stress dependent strain analysis method. METHODS : To measure the longitudinal steel strain, 9-electrical resistance and self-temperature compensation gauges were installed to CRCP test section (thickness = 250mm, steel ratio = 0.7%) and continuously measured 10min. intervals during 30days. In order to properly analyze the steel stress first, temperature compensation process has been conducted. Secondly, measured steel strains were divided into stress dependent strain (elastic strain) and stress independent strain (thermal strain) and then stress dependent strain was applied to stress calculation of longitudinal steels. RESULTS : Steel strains were successfully measured during 30days. To verify the accuracy of temperature compensation process, measured coefficient of thermal expansion(COTE,$11.46{\times}10^{-6}m/m/^{\circ}C$) of longitudinal steel before paving was compared with that of unrestrained steel. Max. steel stress in the transverse direction shows about 266MPa at 23days after placement. CONCLUSIONS : Steel stresses in the longitudinal and transverse direction have been evaluated. In longitudinal direction, steel stress from the crack was rapidly reduced from 183MPa at crack to 18MPa from 600mm apart the crack. From this observation, stress effective length can be identified as within 600mm apart from the crack. In transverse direction, max. stress point was located near the center of pavement width and stress level(266MPa) is about 66% of yield stress of steel.
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참고문헌 (12)
참고문헌 신청
AASHTO / 1981 / AASHTO Interim Guide for Design of PAvement Structures, Chaper 3 revised / America Association of State and Highway Transportation Officials
Bazant, Z.P / 1988 / Mathematical Modeling of Creep and Shrinkage of Concrete / John Wiley and Sons
FHWA / 1990 / Continuously Reinforced Concrete Pavement, Technical Advisory, T 5080.14 / Federal Highway Administraion
Http://www.fhwa.dot.gov/pavement/t508014.cfm
Finke, T. E. / 1978 / Determination of thermalexpansion characteristics of metals using strain gages / Experimental Mechanics :155~158
Bazant, Z.P / 1988 / Mathematical Modeling of Creep and Shrinkage of Concrete / John Wiley and Sons
FHWA / 1990 / Continuously Reinforced Concrete Pavement, Technical Advisory, T 5080.14 / Federal Highway Administraion
Http://www.fhwa.dot.gov/pavement/t508014.cfm
Finke, T. E. / 1978 / Determination of thermalexpansion characteristics of metals using strain gages / Experimental Mechanics :155~158
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