预应力空腹式钢骨混凝土梁极限承载力分析

Analysis of ultimate bearing capacity of Lattice type Prestressed Steel Reinforced Concrete beam

根据预应力空腹式钢骨混凝土梁的特点,分析构件在极限状态下的主要破坏模式及受压区混凝土高度范围,针对不同破坏模式建立中和轴经过上部钢骨和中和轴不经过钢骨的预应力空腹式钢骨混凝土梁的极限抗弯承载力计算公式,将计算结果与试验结果进行比较,两者吻合较好,说明所建公式是合理的。

The main failure modes and the range of height of compressed region in the sectional area of concrete under limit load are analyzed according to the characteristic of Sectional Shape of Lattice type Prestressed Steel Reinforced Concrete（LPSRC） beams.The formula of bearing capacity for bending in different failure modes are thus given,where the neutral axis are passing through the upper angle steel and not passing through angle steel of a LPSRC girder.A comparison showed that the results of calculation and experiment agreed well and the formula are rational.