遅れ弾性ひずみおよびフローひずみ表示式を用いたPC部材のクリープ変形とクリープ係数(続報)

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タイトル別名
  • ON THE CREEP DEFORMATION AND THE EQUIVALENT CREEP FACTOR OF PRESTRESSED CONCRETE MEMBER BASED ON THE DELAYED ELASTIC AND THE FLOW CREEP OF CONCRETE (Part H)
  • 遅れ弾性ひずみおよびフローひずみ表示式を用いたPC部材のクリープ変形とクリープ係数-続-
  • オクレ ダンセイ ヒズミ オヨビ フロー ヒズミ ヒョウジシキ オ モチイタ

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説明

In the previous paper, the authors had carried out the creep strain analysis of prestressed concrete member under following assumptions for creep and crying shrinkage of plain concrete, i. E., (1) proportionality of creep strain to stress, (2) superposition of flow creep strain, (3) same strain rate at the same time elapse after loading for delayed creep strain, (4) neglect of creep recovery after removing the applied stress, and (5) shrinkage strain curve similar to flow creep curve. However, expressions obtained on the creep loss in prestress and the time-dependent strain of prestressed concrete member showed that the effect of the shrinkage of concrete upon those is only given as a function of flow creep factor of plain concrete without regard to the delayed creep factor due to the assumption of (5). Such a result seems to be somewhat improper from the viewpoint of analytical logic. Thus, in this study, applying the assumption that shrinkage strain of plain concrete is in proportion to the sum of flow and delayed creep strain, the analysis of loss in prestress as well as time-dependent strain were carried out again on the prestressed concrete member, and average axial and rotation creep factors for calculating the axial creep deformation throughout the whole length of member and creep rotating displacements at both ends of member were defined from the expressions obtained. Also, numerical calculation results of the prestress loss and creep deformations from the equations derived in this study obtained good agreements with those from previous study.

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