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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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As the lifespan of concrete structures increases, their load carrying capacity decreases owing to cyclic loads and long-term effects such as creep and shrinkage. For these reasons, there is a necessity for stress state monitoring of concrete members. Particularly, it is necessary to evaluate the concrete structures for behavioral changes by using a technique that can overcome the measuring limitations of usual ultrasonic nondestructive evaluation methods. This paper proposes the use of a nonlinear ultrasonic method, namely, nonlinear resonant ultrasonic spectroscopy (NRUS) for the measurement of nonlinearity parameters for stress monitoring. An experiment compared the use of NRUS method and a linear ultrasonic method, namely, ultrasonic pulse velocity (UPV) to study the effects of continuously increasing loads and cyclic loads on the nonlinearity parameter. Both NRUS and UPV methods found a similar direct relationship between load level and that parameter. The NRUS method showed a higher sensitivity to micro-structural changes of concrete than UPV method. Thus, the experiment confirms the possibility of using the nonlinear ultrasonic method for stress state monitoring of concrete members.
목차
Abstract
1. Introduction
2. Experimental Details
3. Sensitivity Comparison with UPV
4. Conclusion
References
참고문헌 (25)
참고문헌 신청
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A. H. Nilson, D. Darwin and C. W. Dolan, "Design of Concrete Structures," McGraw- Hill, New York, pp. 262-280 (2005)
PCI Committee on Prestress Loss, "Recommendations of estimating prestress loss," Journal of PCI, Vol. 20, pp. 43-75 (1975)
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D. E. Branson, "Deformation of Concrete Structures," McGraw-Hill, New York, pp. 127-130 (1977)
A. H. Nilson, D. Darwin and C. W. Dolan, "Design of Concrete Structures," McGraw- Hill, New York, pp. 262-280 (2005)
PCI Committee on Prestress Loss, "Recommendations of estimating prestress loss," Journal of PCI, Vol. 20, pp. 43-75 (1975)
S. V. Kolluru, E. F. O’Neil, J. S. Popovics and S. P. Shah, "Crack propagation in flexural fatigue of concrete," Journal of Engineering Mechanics, Vol. 126, No. 9, pp. 891-898 (2000)
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UCI(KEPA) : I410-ECN-0101-2016-530-002836202