현장계측결과를 이용한 강거더교의 확률적 저항모델
Probability Based Resistance Model of Steel Girder Bridges Based on Field Testing
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초록
Underestimation of the capacity can have serious economic consequences, as deficient bridges must be posted, repaired or replaced. Accurate prediction of bridge behavior may allow for more bridges to remain in service with or without minor repairs. The presented research is focused on the reliability evaluation of the actual load carrying capacity of existing bridges based on the field testing. Reliability analysis is performed on 17 previously tested bridges. Bridges are first evaluated based on the code specified values and design resistance. However, after the field testing program, it is possible to apply the experimental results into the bridge reliability evaluation procedures. The girder distribution factors obtained from the tests are also applied in the reliability calculation. The results indicate that the reliability indices of selected bridges can be significantly increased due to the reduction of uncertainties without sacrificing the safety of structures, by including the result of field measurement data into calculation.
Abstract
Underestimation of the capacity can have serious economic consequences, as deficient bridges must be posted, repaired or replaced. Accurate prediction of bridge behavior may allow for more bridges to remain in service with or without minor repairs. The presented research is focused on the reliability evaluation of the actual load carrying capacity of existing bridges based on the field testing. Reliability analysis is performed on 17 previously tested bridges. Bridges are first evaluated based on the code specified values and design resistance. However, after the field testing program, it is possible to apply the experimental results into the bridge reliability evaluation procedures. The girder distribution factors obtained from the tests are also applied in the reliability calculation. The results indicate that the reliability indices of selected bridges can be significantly increased due to the reduction of uncertainties without sacrificing the safety of structures, by including the result of field measurement data into calculation.
참고문헌 (10)
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- Eom, J., "Live Load Distribution for Steel Girder Bridges", ASCE Journal of Bridge Engineering, 6(6), pp.489~497 (2001)
- Bridge Rating Through Nondestructive Load Testing, "Lichtenstein, A.G.", NCHRP, ~, pp.12-28(13) (1993)
- Schultz J.L., "Efficient Field Testing and Load Rating of Short and Medium Span Bridges", Structural Engineering Review, 7(3), pp.181~194 (1995)
- AASHTO LRFD Bridge Design Specifications, "American Association of State Highway and Transportation Officials" (2008)
- AASHTO Standard Specifications for Highway Bridges, "American Association of State Highway and Transportation Officials" (2004)
- Nowak, A.S., "Development of a Guide for Evaluation of Existing Bridges, Part I", UMCEE 98-12, Department of Civil and Environmental Engineering
- Nowak, A.S., "Verification of Girder Distribution Factors for Existing Bridges", UMCEE 00-10, Department of Civil and Environmental Engineering
- Rackwitz, R., "Structural Reliability under Combined Random Load Sequences", Computer and Structures, 9, pp.489~494 (1978)