【摘要】 本文在弹性蠕变体理论基础上,利用积分中值定理,将积分方程化为代数方程,导出了考虑混凝土收缩徐变和钢筋松弛相互影响的预应力损失计算公式。在分析预应力混凝土构件预应力损失试验结果的基础上,提出了中值系数的计算方法及其具体数值,并提出了应力损失的实用计算公式。对18根预应力陶粒混凝土中心受压构件历时500天的预应力损失实测值与计算值进行了比较,结果表明,公式的精度是满意的。更多还原

【Abstract】 The formulas for calculating the prestress losses due to the interaction of shrinkage and creep of concrete and relaxation of steel are presented. The formulas are derived on the base of both the theory of elastic-creep body and the mean value theorem of the integral calculus. By analyzing the test results of prestress losses,the calculating method of the intermediate values as well as the practical calculating formulas of prestress losses are given in the paper. The test results of 18 uniformly prestressed ceramsite concrete members which had lasted 500 days were compared with the calculating results and satisfactory agreement was obtained.更多还原