关于预应力混凝土空心板最小配筋率的讨论

混凝土受弯构件在少筋的情况下容易发生钢筋拉断的脆性破坏 ,特别是预应力混凝土构件由于初始张拉力的存在更容易发生脆性破坏 .因此 ,对预应力混凝土构件的最小配筋率限制得更严格 .针对预应力混凝土空心板最小配筋率不满足的情况 ,采用调整张拉控制应力系数Cx 值和部分张拉受力钢筋两种方法 ,对预应力混凝土空心板最小配筋率的变化情况进行了分析和讨论 ,通过对计算结果的分析处理 ,对预应力空心板的设计提出几点建议 ,所得优化系数有较好的应用价值 .

The discussion of the minimum reinfercement ratio of prestressing concrete hollow slab

In the case of under reinforced concrete,brittle tension failure often occurs in concrete structure, which steel fractured. Especially, the case occurs more easily because the exist of the initial prestress. So, the reinfercement ratio of prestress concrete structure was restricted strictly. According to non-content of the smallest reinfercement ratio of prestress concrete hollow slab, the authors adopts the method of adjusting the coefficient C x of tension control stress and partially stretching steel. By the discussing and analysis, the paper gets the valuable optimization coefficients and gives us some advice for designing of prestress concrete hollow slab.WX(5KG0,41]