비부착 긴장력이 거더의 횡비틀림 안정성에 미치는 영향
The Influence of Unbonded Prestressing Force on the Lateral Torsional Stability of Girders
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초록
본 연구에서는 프리스트레스 긴장력의 위치와 크기에 따른 거더의 횡비틀림 안정성 실험을 수행하였다. 거더를 이용한 횡방향 거동 및 안정성 실험은 재료의 비선형성, 초기 기하학적 불완전성, 긴장력의 변화, 하중조건과 지지조건 등 다양한 변수에 의해 예상치 못한 결과를 발생시킬 수 있다. 따라서, 본 연구에서는 프리스트레스 거더 축소 모형 실험안을 제안하여 긴장력에 의한 횡비틀림 안정성을 실험을 수행하였다. 하중 가력조건과 면내 및 면외 지지조건을 만족하며 긴장력을 조절할 수 있는 실험장치를 제안하고 제작하였다. 실험결과 하부 플랜지에 긴장력이 작용하는 경우 횡비틀림 안정성을 증가시켰으며, 최종적으로 긴장력의 위치와 크기에 따라 횡비틀림 안정성을 평가할 수 있는 해석식을 제안하였다.
Abstract
An experiment was carried out to evaluate the lateral torsional stability of a girder with respect to the location and magnitude of prestressingforce. The test of evaluating the lateral displacement and stability of a girder could cause an unexpected result due to various parameters, such as materialnonlinearity, initial geometric imperfections, prestressing force, and loading and support conditions. Therefore, a small model testing was programmedto control the various parameters and assess the lateral torsional stability with respect to the prestressing force. This study proposed and fabricatedan experimental apparatus that can satisfy the loading and in-plane and out-of-plane support conditions and also contol the prestressing force. Theresult of the experiment showed that the lateral torsional stability increased when the prestressing force was applied in the bottom flange of the girder. As a result, this study proposed an analytical equation that can account for the effect of the prestressing force in the lateral torsional stability of a girder.
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