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预应力钢-混凝土组合梁作为一种新型的横向承重构件,在工程中得到了广泛的使用,准确计算其抗弯承载能力是工程上最为基本也是最重要的要求。该文以弹性分析理论为基础,推导了考虑交界面相对滑移和预应力增量的预应力组合梁弹性承载能力和挠度计算公式;以完全协同作用和平截面假定为前提,采用简化的塑性理论,推导了考虑预应力增量的极限抗弯承载能力计算公式。公式能够反映预应力组合梁的受力特点,计算结果与试验值吻合良好,满足工程精度。
As a new type of transverse load-bearing member, prestressed steel-concrete composite beams have been widely used in engineering. The most basic and important engineering requirements are to accurately calculate the flexural capacity. Based on the theory of elastic analysis, the formulas for calculating the elastic bearing capacity and deflection of prestressed composite beams considering the relative slippage and prestressing increment of interface are deduced. Based on the assumption of complete synergy and the assumption of flat section, the simplified plastic theory , The formula for calculating the ultimate flexural capacity considering the increase of prestressing force is deduced. The formula can reflect the force characteristics of the prestressed composite beam, the calculated results are in good agreement with the experimental values, and meet the engineering accuracy.