A STUDY ON LONG-TERM DEFORMATION AND STRESS OF PRESTRESSED REINFORCED CONCRETE MEMBERS

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  • PRC部材の長期変形・応力に関する研究
  • PRC ブザイ ノ チョウキ ヘンケイ オウリョク ニ カンスル ケンキュウ

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A new creep analysis method based on principle of superposition for concrete is proposed, which can analyze not only deformations but also stresses of prestressed reinforced concrete (PRC) members under sustained loads at any ages between the age at prestressing and the age considered. Time-dependent deformation and stress of PRC members, which are cracked by instantaneous loads and afterwards sustained load is increased in two steps, is experimentally studied and the present analysis method is investigated comparing the computed results with experimental results. As a consequence, the present analysis method showed fairly good agreement with experimental results, which overestimated average curvature of the member prestressed higher and that subjected to increased sustained load. Furthermore, the effect of creep and that of shrinkage of concrete on long-term deformation are estimated numerically.

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