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基于准确、快速抽样的拉丁超立方抽样法和按龄期调整的有效模量法,推导了同时考虑收缩徐变时变性和不确定性、及其与预应力筋应力松弛相互作用的预应力损失计算公式,形成了一种混凝土结构长期预应力损失计算方法。通过该方法对C50混凝土试验梁进行预应力损失计算,结果表明,试验梁长期预应力损失实测值均位于该方法计算的预应力损失置信区间的中部,论证了文中预应力损失方法的准确性和可靠性。
Based on the accurate and fast sampling Latin hypercube sampling method and age-adjusted effective modulus method, the degeneration and uncertainty of both shrinkage and creep and the prestressing loss interaction with stress relaxation of prestressing tendons are deduced Calculation formula, formed a concrete structure long-term prestress loss calculation method. The results show that the measured values of the long-term prestressing loss of the test beam lie in the middle of the confidence interval of the prestress loss calculated by this method, and the accuracy of the prestress loss method in this paper is demonstrated. reliability.