8.25 , N,
(8.4) |
8.26 - 8.32 m - , 8.15.
8.26 , ,
(8.5) |
æ - , (8.6) (8.7) 8.32;
Wn - , bef.
Q :
τ m ≤ 0,25 Rs
æ = æ1; | (8.6) |
0,25 Rs < τ m ≤ Rs
(8.7) |
æ1 - , , - 8.16, - 1,15, --1,25;
- ;
- ;
- ,
Q - ,
(8.8) |
æ2 (8.27).
8.16
æ1, (Af ,min + Aw), | |||||||||||
0,01 | 0,1 | 0,2 | 0,3 | 0,4 | 0.5 | 0,6 | 0,7 | 0,8 | 0,9 | 1,0 | |
1,243 | 1,248 | 1,253 | 1,258 | 1,264 | 1,269 | 1,274 | 1,279 | 1,283 | 1,267 | 1,243 | |
0,1 | 1,187 | 1,191 | 1,195 | 1,199 | 1,202 | 1,206 | 1,209 | 1,212 | 1,214 | 1,160 | - |
0,2 | 1,152 | 1,155 | 1,158 | 1,162 | 1,165 | 1,168 | 1,170 | 1,172 | 1,150 | - | - |
0,3 | 1,128 | 1,131 | 1,133 | 1,136 | 1,139 | 1,142 | 1,144 | 1,145 | 1,097 | - | - |
0,4 | 1,110 | 1,113 | 1,115 | 1,118 | 1,120 | 1,123 | 1,125 | 1,126 | 1,069 | - | - |
0,5 | 1,097 | 1,099 | 1,102 | 1,104 | 1,106 | 1,109 | 1,110 | 1,106 | 1,061 | .- | - |
0,6 | 1,087 | 1,089 | 1,091 | 1,093 | 1,095 | 1,097 | 1,099 | 1,079 | - | - | - |
0,7 | 1,078 | 1,080 | 1,082 | 1,084 | 1.086 | 1,088 | 1,090 | 1,055 | - | - | - |
0,8 | 1,071 | 1,073 | 1,075 | 1,077 | 1,079 | 1,081 | 1,082 | 1,044 | - | - | - |
0,9 | 1,065 | 1,067 | 1,069 | 1.071 | 1,073 | 1,074 | 1,076 | 1,036 | - | - | - |
1,0 | 1,060 | 1,062 | 1,064 | 1.066 | 1.067 | 1,069 | 1,071 | 1,031 | - | - | - |
2,0 | 1,035 | 1,036 | 1,037 | 1,038 | 1,039 | 1,040 | 1,019 | - | - | - | - |
3,0 | 1,024 | 1,025 | 1,026 | 1,027 | 1,028 | 1,029 | 1,017 | - | - | - | - |
4,0 | 1,019 | 1,019 | 1,020 | 1,021 | 1,021 | 1,022 | 1,015 | - | - | - | - |
5,0 | 1,015 | 1,015 | 1,016 | 1,017 | 1,018 | 1,018 | - | - | - | - | - |
1 Aw . 2 Af ,min = 0. |
bef Wn
|
|
(8.9) |
v - bi bef 8.17;
bi - , b max ( bi = b) bi = bk, b ≥ 0,04 l bk ≥ 0,02 l ( v = 1);
l - .
8.17
σmin/σmax | v | σmin/σmax | v |
1,0 | 0,25 | 0,65 | |
0,7 | 0,20 | 0,60 | |
0,5 | 0,85 | 0,10 | 0,52 |
0,33 | 0,72 | 0,43 | |
, 8.17: σmin, σmax - bi . - , , , , , v . |
8.27 , .
:
-
(8.10) |
-
(8.11) |
æ x, æ y - , (8.6) (8.7) ;
ψ x, ψ y - , :
- :
(8.12) | |
ψy = 1; | (8.13) |
- :
(8.14) | |
(8.15) |
(8.16) | |
(8.17) |