ֲ܉
dwֲ܉eϕr(sh)dйʽӋ㣺
Nl≤γfAl7-17
γ=1+0.357-18
ʽNl——ֲ܉eϵSOӋֵ
γ——wֲϵھֲ܉wô俹ȵͨ^(gu)γ(li)]
Al——ֲ܉e
A0——ӰwֲȵӋe
c——ξֲ܉e߅߅^Сxhr(sh)ȡh.
S
Sijdʽ7-19Ӌ㣺Nt≤ftA7-19
ʽNt——SOӋֵ
ft——wSĿOӋֵwYOӋҎGB50003—20013.2.2
ģ
Ŀdʽ7-20Ӌ㣺M≥ftmW7-20
ʽM——OӋֵ
ftm——wďOӋֵwYOӋҎ3.2.2
W——ֿ
1W(wng)ע(li)ԴO̽W(wng)ƷٽO̽W(wng)δ(jng)W(wng)ڙDd朽DNʽʹѽ(jng)W(wng)ڙڙʹұע(li)ԴO̽W(wng)`W(wng)䷨؟
2W(wng)YϞW(wng)ѼDdMߺͳ̎ڱW(wng)dƷ漰Ȇ(wn)}ՈcW(wng)վ(lin)ϵW(wng)վˌ(sh)_J(hu )M̎
W(wng)Dd֮Ʒζ(zh)JͬԓƷ^(gun)c(din)挍(sh)ýwW(wng)վ(g)DdʹՈc(zh)(lin)ϵؓ؟
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