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텐돈의 긴장력 손실에 따른 프리스트레스 콘크리트 격납건물의 거동해석
진재철,전영선,이홍표 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
The prestressing force of tendon can be decreased by creep of concrete, shrinkage of concrete and relaxation of steel. In this paper, we describe some primary causes of time-dependent losses of prestressing tendon force. New stress reduction model is proposed to predicit time-dependent losses of prestressing tendon force in accurate way. It should be noted that the proposed model is based on the data, which are accumulated from the in-service inspection of posttensioned cotainment building system. Using the new stress reduction model, we carry out finite element analysis to investigate how the losses of prestressing force effect to the structural behaviour of containment building. From FE analysis with new stress reduction model, concrete creep appears as the primary factor which can influence the reduction of prestressing tendon force. It also appears that the relaxation of steel as the secondary influencing factor and shrinkage of concrete as the tertiary factor.