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本文在分析了我国《公路预应力混凝土桥梁设计规范》计算徐变应力损失公式存在精度不高,且在大多数情况下偏于不安全等问题的基础上,根据线性弹性徐变体理论,提出了预应力混凝土构件徐变应力损失的计算公式。该式不仅在理论上更加完善,而且计算简便。并在此基础上又提出了徐变变形的计算公式,计算结果与实测值也能较好地符合。
In this paper, based on the analysis of linear elastic creep theory, based on the theory of linear elastic creep theory, the calculation accuracy of creep stress loss formula in our country’s “Code for design of prestressed concrete highway bridges” is not high, and in most cases it is unsafe. The formula for calculating creep stress loss of prestressed concrete members. The formula is not only more perfect in theory, but also easy to calculate. On this basis, the calculation formula of creep deformation is put forward, and the calculated result is in good agreement with the measured value.