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本文用弯矩曲率分析法,对无粘结部分预应力混凝土梁提出沿梁的长度方向束中心处混凝土平均应变计算及束的应变协调方程,并将梁在长度方向离散为有限个微段后,用迭代法对梁的整个加载过程进行全过程分析,求得束的应力增量及各类参数。计算结果与试验值作了比较,证明本文提出的分析方法精度较为理想,可用于精确计算无粘结部分预应力梁和用计算机进行梁的模拟试验。
In this paper, with the method of bending moment curvature analysis, the average strain of the concrete along the center of the beam along the longitudinal direction of the beam and the strain coordination equation of the beam are proposed for unbonded partially prestressed concrete beams, and the beam is discreted into a finite number of segments in the longitudinal direction. The iterative method is used to analyze the whole process of the beam loading process, and the stress increment and various parameters of the beam are obtained. The calculated results are compared with the experimental values, which proves that the analytical method proposed in this paper is more accurate. It can be used to accurately calculate the unbonded part of the prestressed beam and the computer to simulate the beam.