钢与高强混凝土预应力组合梁承载力计算

根据预应力组合梁结构特性及实际受力情况,分别建立了预应力组合梁在不同受力阶段的截面应力及组合梁抗弯极限承载力的计算公式,通过试验验证了理论公式的正确性·研究结果表明,在承受正弯矩预应力组合梁的钢梁下翼缘施加预应力时组合梁的承载力提高幅度较小,而在承受负弯矩组合梁的钢梁上翼缘和混凝土板中施加预应力均可提高组合梁的承载力,并且在混凝土板中施加预应力效果最为明显·

Carrying Capacity Calculation of Prestressed Steel-HS Concrete Composite Beams

According to the structural characteristics and actual loading conditions, some formulas were derived to calculate the cross-sectional stress and ultimate bending strength of the prestressed Steel-HS concrete composite beams in different loading phases. Testing results verified the correctness of these formulas. For the carrying capacity of a prestressed composite beam on which a positive moment is acting, it cannot be improved much more if applying prestress to the lower flange of steel beam. However, it may be effectively improved for the composite beam on which a negative moment is acting if applying prestress to the upper flange of steel beam and may be improved to the best if applying prestress to the concrete slabs.