受拉区增大截面加固后相对界限高度系数研究

The Research on Limits of Relatively High Coefficient after Reinforcement of Enlarging Sectional Areas in Tensile Region

针对受拉区加固后的组合截面受弯构件正截面承载力计算公式并没有对其受压区相对界限高度系数进行说明,对影响受拉区增大截面加固后相对界限高度系数的因素进行分析计算。为了方便计算,提出了简化运算公式,并与不同的计算模式进行了分析比较。结果表明,受拉区增大截面加固后相对界限高度系数可按照本文提出的简化计算公式进行运算,且能充分保证构件不发生脆性破坏。

According to the fact that the limits of relatively high coefficient on compression zone is not explained in the computing of ultimate bearing capacity by enlarging sectional areas in tensile region, the paper has preented the factors which influence the limits of relatively high coefficient of the tensile region reinforced by enlarging sectional areas. The simplified calculation formula for the limits has been proposed for the sake of the convenient calculation, and the different calculation patterns are compared. The result shows that the limits of relatively high coefficient in the tensile region reinforced by enlarging sectional areas can be calculated by the current formula, which can assure that the brittle failure will not occur in the components.