预应力组合梁比普通组合梁的极限荷载可提高27.7%；
The ultimate capacity of prestressed composite beams is 27.7% higher than that of reinforced concrete ones.
实例计算结果表明，预应力组合梁的屈服荷载比普通组合梁的屈服荷载高，组合梁的弹性工作范围扩大了；
The results of this investigation show that the yield load of prestressed composite beams is higher than that of reinforced concrete composite ones, which widen the elastic area they behaved.
阐述了作用于PC轨道梁桥结构上的荷载，曲线pc轨道梁的内力计算，预应力计算，应力计算及组合。
The article have expounded the load acting on PC single track beam, and the calculation of curved PC single track beam including force, prestress and the stress etc.
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