( )
s0,max = 1000. P = 0,05; P = 0,05*1000 = 50. , σ0.max+P= 1000 + 50 = 1050 < 0.9fpk = 1080; σ0.max-P = 1000 50 = 950 > 0.3* fpk = 0.3*1200 = 360 ( ).
12.28. /3/, . s1 = (0,21*1000/1200 0,1)1000*27.7 = 207,7.
Dt = 60o; s2 = 1,25*50*27.7 = 75; , , DL = 2 L = 20, s3 = 2*180000*27.7/20000 = 18;
- , s4 = 0; - , .. s5 = 0.
sLoss = 207,7 + 75 + 18 + 0 + 0 = 300,7, s0.max = 1000 300,7 = 693.
0 = 0,00138*693 = 0,95. 6 6 ( ).
gf = 1. Mrd = 5,78*20.72 / 8 = 309,6 = 0,3096.
() () :
fcp = 0.7C = 0.7*60 = 42;
.. scp/ fcp = 7,35/42 = 0.175<a = 0.75, 0,85 ( ) s6 = 0.85*0.175*60 = 8,92.
.. scs< 0, = 0, .. ss = 0.
sLoss = 300,7 + 8,92 = 309,6;
( gsp = 1) ssp,1 = 1000 309,6 = 690,3. 01 = 690,3*0,00138 0 = 0,95.
, s8 = 0.85*50 = 42.5. s9 = 0.85*150*0,91 = 103.
S ,
ss = 0.
sLoss = 207,7 + 75 + 18 + 0 + 0 + 8,92 + 42,5 + 103 = 455,3 > 100.
( gsp = 1) ssp,2 = 1000 455,3 = 544,7.
. . 6.4.
.6.4. .
- . | ||||||||
0-0 | 1-1 | 2-2 | 3-3 | 4-4 | 5-5 | 6-6 | ||
Lx + 0,125 | 0,292 | 0,716 | 1,285 | 3,575 | 7,025 | 7,784 | 10,475 | |
gs5 | - | 0,327 | 0,803 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 |
gs5P0 | 312,951 | 767,372 | 956,000 | 956,000 | 956,000 | 956,000 | 956,000 | |
Md | 0,010 | 0,034 | 0,066 | 0,172 | 0,275 | 0,289 | 0,310 | |
scp | 4,015 | 9,502 | 11,244 | 9,122 | 7,652 | 7,642 | 7,353 | |
scs | -0,399 | -0,867 | -0,749 | 0,306 | 0,454 | 0,469 | 0,076 | |
sc | 4,875 | 11,538 | 13,654 | 11,077 | 9,291 | 9,279 | 8,929 | |
ssp.1 | 21,779 | 490,453 | 685,646 | 688,223 | 690,009 | 690,021 | 690,371 | |
P01 | 60,327 | 1358,554 | 1899,240 | 1906,379 | 1911,324 | 1911,357 | 1912,328 | |
s8 | 13,913 | 34,114 | 42,500 | 42,500 | 42,500 | 42,500 | 42,500 | |
s9 | 46,436 | 48,833 | 52,020 | 65,076 | 84,341 | 88,613 | 103,148 | |
sloss | 365,923 | 395,185 | 408,874 | 419,353 | 436,833 | 441,092 | 455,277 | |
ssp.2 | 306,722 | 407,506 | 591,126 | 580,647 | 563,167 | 558,908 | 544,723 |
|
|
, Lp, gs5. , ssp=690,3 <fpk = 1200 , wp = 1 Dlp = 25; Lp= (1×1150/28 + 25)*14= 892 = 0,892 . .., 0 0 1 1 , gs5 = (Lx + 0,125)/Lp. gs5 = 1.
t = 100 . , j.
6.7. .