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先张法的第一批预应力损失σlI,和第二批预应力损失σlII为()。 A.σlI=σl1+



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...һԤӦʧ,ԤӦֽӦΪ( )...
ŷԤӦ,һԤӦʧ,ԤӦֽӦΪ( ) A.conDlB.conDlDEpc...
ԤӦṹϰ˼
ԤѹǰΪһ, lI ԤѹΪڶ,Ϊ lII :ŷ ŷ lI = l1 + l 3 + l 4 lI = ...
ԤӦֽԤӦʧ,ê߱ʧ(11),Ħ...
Ƽʱ,ԤӦʧ,ڻԤѹǰΪһ,ԤѹΪڶŷԤӦʧ( ) A.һ11+12+14;ڶ15+16B....
ԤӦʴ
ԤѹǰΪһ, lI ԤѹΪڶ,Ϊ lII :ŷ lI = l1 + l 3 + l 4 lI = l1 ...
2012ṹA
ŷĵһԤӦʧֵ l ͵ڶԤӦʧֵ l ֱΪ( ...0.5) 1178 = 117.8 N / mm 2 lI = l1 + l 3 + ...
...һԤӦʧȷ___ __ٶȸ߿
ӦֱԤӦŷԤӦ,ó,һԤӦʧȷ___ A.l1+l2+l3+l4B....
ԤӦֽԤӦʧ,ê߱ʧ(11),Ħ...
Ƽʱ,ԤӦʧ,ڻԤѹǰΪһ,ԤѹΪڶŷԤӦʧ() A.һ11 +12 +14;ڶ15 +16...
2009-2011
D 5.ŷĵһԤӦʧֵ l...' ͵ڶԤӦʧֵ l?? ֱΪ( C )...==== l1 ++ l 2 + l 3 ,...
ֽھ±εʮԤӦ
15. һ͵ڶԤӦʧ 1 6...ê߱ʧ l1 = a * E s / l. ʽ l...con (B) con- LI (C) con- LII 36...
ԤӦ
10.һ͵ڶԤӦʧ ֽġ 11...l ? ֱΪ (A) (C) ? lI ? ? l1 ? ? ...con (B) con- LI (C) con- LII 15...
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