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对体外预应力钢-混凝土连续组合梁进行全过程受力分析时,需准确计算预应力筋的拉力,因此,对预应力组合梁中预应力增量及全过程受力分析的计算方法进行了研究。根据梁体自身在荷载作用下的变形条件,采用几何方法给出了各种布筋形式下体外预应力筋伸长量的计算方法;基于共轭梁法,并考虑连续组合梁内力重分布,采用迭代法得到了预应力连续组合梁的荷载-变形曲线和预应力筋拉力随荷载的变化规律,计算结果与模型试验及其它文献中的模型试验结果进行了对比,结果吻合良好。研究结果表明:体外预应力组合梁中预应力筋的荷载-拉力关系曲线反映出预应力筋经历了从弹性到塑性的发展过程。根据梁自身在荷载作用下的几何变形条件,得到任意加载时刻的预应力筋拉力,用于全过程受力分析。
For the whole process of external prestressed steel-concrete composite beams subjected to stress analysis, the tension of prestressing tendons must be accurately calculated. Therefore, the calculation method of prestressing increment and stress analysis in prestressed composite beams the study. According to the deformation condition of the beam body under load, the calculation method of the external prestressing tendon elongation under various types of cloth reinforcement is given by the geometrical method. Based on the conjugate beam method, considering the internal force redistribution of the continuous composite beam, The iteration method was used to get the load-deformation curve and the tension of prestressing tendons with load. The calculated results were compared with the model tests and the model tests in other literatures. The results are in good agreement. The results show that the load-tension curve of the prestressing tendons in the externally prestressed composite beams shows that the prestressing tendons have undergone the development from elasticity to plasticity. According to the geometric deformation conditions of the beam itself under load, the tension of prestressing tendons at any loading moment is obtained, which is used for the stress analysis of the whole process.