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本文讨论了按平截面假定和换算的矩形应力图形作为计算图形以确定正截面强度的问题,在此,根据压力和其作用点不变的原则来进行换算。文中证明混凝土的(压)应力应变曲线可以近似简单地取为梯形,给出受弯构件的极限受压区高度系数ξi 值和双向弯曲的计算公式。对矩形截面对称配筋的偏心受压构件,除给出有关计算公式外,还绘制了计算较复杂的小偏心受压时的计算图表示例,包括考虑侧边钢筋时的图表和双向偏心受压的相应验算。
This paper discusses the problem of determining the strength of the normal section based on the flat section assumption and the converted rectangular stress graph. Here, the conversion is based on the principle of constant pressure and its application point. It is proved that the (stress) stress-strain curve of concrete can be approximated simply as a trapezoid, giving the calculation formula of the height coefficient ξi value and bi-directional bending of the ultimate compression zone of the flexural member. For eccentric compression members with symmetrical cross-sections of rectangular cross-sections, in addition to the relevant calculation formulas, examples of calculations for calculating more complex small eccentric compressions are also presented, including charts with side reinforcements and biaxial eccentric compression. The corresponding check.