( ) 20...30, .
.12, 13, 18 [2] , . 5.
5.
γb2 | , | , b | ||||
Rb | Rbt | Rb,ser | Rbt,ser | |||
20 | 1,0 | 11,50 | 0,90 | 15,0 | 1,4 | 24∙103 |
0,9 | 10,35 | 0,81 | - | - | ||
25 | 1,0 | 14,50 | 1,05 | 18,5 | 1,6 | 27∙103 |
0,9 | 13,05 | 0,95 | - | - | ||
1,0 | 17,00 | 1,20 | 22,0 | 1,8 | 29∙103 | |
0,9 | 15,30 | 1,08 | - | - |
. I Rb Rbt γb2 = 0,9.
. 2.19 , , . 2.24 [2]. 19, 20, 22, 23, 29 [2] . 6.
: Q ∙ , .
(.8)
, . -1, -1 4...6 . 600 [2, .5.22].
200/200/3/3 -1.(. . 3).
, , , , (..5). , .
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, (11)
φw1 = 1 + 5 α ∙ μw, 1,3;
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(11) .