钢筋混凝土梁的承载力计算公式

2025年04月07日 10:56
有2个网友回答
网友(1):

双筋截面混凝土梁的承载力表达式如下:

如果受压区高度不变,即x不变,压区钢筋增大(根据式1,拉区钢筋也要增大),则Mu提高。

梁的变形能力主要取决于梁端的塑性转动量,梁的塑性转动量与截面混凝土相对受压区高度有关。

梁端底面的钢筋可增加负弯矩时的塑性转动能力,还能防止在地震中梁底出现正弯矩时过早屈服或破坏过重,从而影响承载力和变形能力的正常发挥。根据国内外试验资料,受弯构件的延性随受拉配筋率的提高而降低,随受压钢筋配筋率的提高而提高。

扩展资料

相对受压区高度不大于界限受压区高度是混凝土梁设计中的一条重要原则。在梁截面尺寸和混凝土强度等级不变的情况下,增大受压区钢筋,是改善相对受压区高度的唯一方法。式1即可表明这一点。

最大配筋率的本质,就是要满足相对受压区高度小于界限受压区高度。以C30,HRB400为例,界限受压区高度为0.518。

令ξ=0.518,根据式2,ρ=2.1%/(1-μ),如果不考虑压区钢筋(μ=0),最大配筋率为:ρ=2.1%,在相对受压区高度不大于0.518的情况下,最大配筋率为2.5%,则相当于μ=0.16,受压钢筋面积/受拉钢筋面积不小于0.16。

参考资料来源:百度百科-钢筋混凝土结构计算与设计

网友(2):

钢筋混凝土配箍筋梁的受剪承载力设计公式为:

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