混凝土梁后张拉法理论伸长量计算研究

Rationality Verification of Theoretical Elongation Calculation of Zhang Rafa after Precast Beam and Cast-in-Place Box Girder

预应力筋伸长量计算是保障混凝土梁安全性的重要因素。介绍了预应力筋缓和曲线平面曲线包角的计算方法,研究建立了预制梁和现浇箱梁理论伸长量的计算方法,通过两个算例验证了预制梁和现浇箱梁理论伸长量计算方法的准确性。结果表明,预制梁和现浇梁的理论伸长量与设计伸长量之间误差分别在1%以内和9%以内,提出的计算方法具有较高的精度,可为国内同类型混凝土梁的设计与施工提供借鉴和参考。

The calculation of prestressed reinforcement elongation is an important factor to ensure the safety of concrete beams.This paper introduces the calculation method of the plane curve wrap angle of the prestressed steel transition curve,studies and establishes the calculation method of the theoretical elongation of the precast beam and the cast-in-place box girder,and finally verifies the accuracy of the calculation method of the theoretical elongation of the precast beam and the cast-in-place box girder through two examples.The results show that the error between the theoretical elongation of the precast beam and the design elongation is within 1%and 9%,the proposed calculation method has high accuracy,which can provide reference for the design and construction of the same type of concrete beams in China.