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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