双向受弯和轴压组合的利用率

{(\frac{f_{c}}{F_{c}'})}^{2} + \frac{f_{bx}}{F_{bx}' \cdot [1 - (\frac{f_{c}}{F_{cEx}})]} + \frac{f_{by}}{F_{by}' \cdot [1 - (\frac{f_{c}}{F_{cEy}}) - {(\frac{f_{bx}}{F_{bE}})}^{2}]} ⩽ 1.0

{(\frac{171}{673})}^{2} + \frac{353}{1, 729 \cdot [1 - (\frac{171}{3, 965})]} + \frac{1, 029}{1, 936 \cdot [1 - (\frac{171}{728}) - {(\frac{353}{6, 577})}^{2}]} = 0.98

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