σsp=0.6Rs,ser=0,6600=360.
: σsp + ≤ Rs,ser σsp - >0,3 Rs,ser
=30+360/L, L=6,0 - , =30+360/6,0=90
σsp + ≤ Rs,ser 360+90=450≤ 600= Rs,ser -
σsp - >0,3 Rs,ser 360 -90=270>0,3600=180 - .
σsp=360
.
1 .
q = q. ·b·γn, /, b=1,2 , q. =4,85/ ; γn= 0,95
q = 4,85 ·1,2·0,95=5,5/;
Lo=L-/2-/2, =120 180
Lo=5980-60-90=5830=5,83
Mmax=
Qmax=
.
, , ( ) .
, h = 0,9 ∙d = 0,9 ∙159 = 143,1 ,
d = 159 ;
h = (h - h ): 2=(220-143,1): 2 =38,45 ;
h =220 ;
b =
n=6- , b=1,2
38,45/220 = 0,17 > 0,1
b = 1,16
= Rb· b h (h - 0,5 h ), h = h a = 220 0,1 220 = 198
f=115000,91,160,03845(0,198-0,50,03845)=82,5-
f=82,5 > =23,5 .
o = ξ=0,05
ξR=0,56- ; oR=0,403- 0;
: ξ<ξR; 0,05 < 0,56 o=0,049<0,403=oR , .
:
γs6=η-(η-1) )≤ η,
η=1,2 600
γs6=η-(η-1) )=1,2-(1,2-1)(
γs6= 1,2
s =
4 Ø10 600 = 3,14 > 1,9=s
, 2 .
.
5.1. :
Qmax ≤ Qb = 0,35Rb γb2bho =0,35∙11500∙0,9∙0,3146∙0,198=225,6
|
|
Qmax ≤ Qb = 0,6Rbt γb2bho=0,6∙900∙0,9∙0,3164∙0,198=30,44
Qmax=16≤225,6 = Qb Qmax=16≤30,44= Qb
, -1 L/4=6/4=1500 s=h/2=220/2=110, 100
5.2. dsw≥0,25ds=0.25∙10=2,5,
dsw Ø3500-
4 -1 , 2 .
.
1.141. Ø12 240. 1300. -4. 700 .
.
Ø 10 600. L/4=1,5 Ø 500 100 , Ø3 500.
. C-3 460 Ø3 500 .
-2 420, Ø3 500.