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?????? ? ??????????????? ?????????????? ??????????? ?????????????? ????????? ?????? ?????????? ? ????????(???????????????) ?????????
????? ?????????????? ?????????? ??????
?????? ????????? ??????? ??????????:
??????? ??????: 6,3=1,2*0,5+1,2*0,5+1,2*3+1,5
??????? ??????: 6,3=1,2*0,5+0,2+1,2*3+1,9
f=0,2? - ???????? ?????????? ????? ????? ? ??? ??????
?????? ?????????? ?????????????? ?????????? ??????:
l? - ?????????????? ?????: l? = l2 - 2(150+20) = 4600-340 = 4260??
b?? - ???????? ????????: b??= 150 - 20 = 130??
l0 - ????????? ??????: l0 = l? - b?? = 4260 - 130 = 4130??
?????? ?????????? ?????????????? ?????????? ??????:
b?? - ??????????????(?????????) ??????: b?? = b?? - 10 = 1200 - 10 = 1190??
b?? - ??????????? ?????? (?? ????), b?? = 1200??
bf - ?????? ?????: bf = b?? - 2*15 = 1190 - 30 = 1160??
d?? - ??????? ?????????, ?? ???? ???????? (???????????????????), d?? = 160??
??????????? ????????, ??????????? ?? ???????????? ??????????, ? ???? ???????? ?? ???? ??????
V? - ????? ??????, ?3: V? = h?*b??*l? - 6*l?*p*d2*0,25 = 0,601?3
g?n - ??????????? ???????? ?? ???????????? ???? ??????: g?n = ?*V? / b??*l? = 2939,16?/?2
??? ? - ????????? ???????????????? ???????? ???????????? ?????? 25000?/?3
q? = q*b??*?n = 11903,1*1,2*0,95 = 13569,5?/?
?????? ??????????? ????????(????????):
qn? = qn*b??*?n = 10239,2*1,2*0,95 = 11672,6?/?
??????????????(?????????) ??????????? ??????????? ????????(????????):
qq,l? = qn,l*b??*?n = 8239,2*1,2*0,95 = 9392,64?/?
??????????? ? ????????? ???????? ?? 1?2 ??????????
??? ??????????????????? ????????, ?/?2??????????? ?????????? ?? ????????, ?f????????? ????????, ?/?2?????????? ????????:
1)??????????? ??? ?????
2)??? ??????????? ????
3)??? ????????? ???????????
?????:
g?n = 2939,2
700
1600
gn = 5239,2
1,1
1,3
1,1
g? = 3233,1
910
1760
g = 5903,1????????? ????????:
? ??? ?????:
1)??????????
2)???????????????pn = 5000
pn,l = 3000
pn,sh = 20001,2
1,2
1,2p = 6000
pl = 3600
psh = 2400?????? ????????:
? ??? ?????:
1)??????????, qn.,l = gn+pn,l
2)???????????????, qn,sh = pn,shqn = 10239,2
qn,l = 8239,2
qn,sh = 2000 - - - q = 11903,1
????? ????????? ????? ?????? ? ?????? ?????????? ?????? ? ??????
?????????? ?????? ?? ?????? ????????? ????????:
M = q?*l0 2 / 8 = 13569,5*4,132/8 = 28931,72?*? = 28,9??*?
?????????? ???? ?? ?????? ????????? ????????:
Q = q?*l0 / 2 = 13569,5*4,13/2 = 28021,04? = 28,0??
?????????? ?????? ?? ?????? ??????????? ????????:
Mn = qn?*l0 2 / 8 = 11672,6*4,13/8 = 24887,38?*? = 24,9??*?
?????????? ?????? ?? ??????????????(?????????) ??????????? ??????????? ????????:
Mn,l = qn,l?*l0 2 / 8 = 9392,6*4,13/8 = 20026,16?*? = 20,0??*?
?????????????? ???????? ? ??????
?? ?? 52-102-2004 ??? ???????? ?? - 5 ???????: Rs,n = Rs,ser = 800???, Rs = 695???, Es = 2,0*105???. ? ???????? ????????????? ???????? ??????????????? ???????? ?????? ?500. ??? ?500: Rs = 415???, Es = 2,0*105???.
????? ?????? - ?30:
Rb,n = Rb,ser = 22,0???, Rbt,n = 1,80???, Rb = 17,0???, Rbt = 1,2???, Eb = 32,5*103???.
????? ???????? ????????? ???????????????? ?????????? ? ??????????? ????????
??????????????? ?????????? ???????? ssp ????????? ??? ?????????????? ? ???????????????? ??????????? ???????? ?? ????? 0,9Rs,n.
ssp,0 - ???????? ???????? ???????????????? ??????????.
ssp,0 = 0,9Rs,n = 0,9*800 = 720???
? ??????????? ???????? ssp,0 ????????????? ???????? ?????? ???????????????? ??????????. ???????, ? ????? ? ????? ????????? ???????????? ??? ???????????? ????? ?? ????????? ????????, ????????? ssp,0 = 620???.
?sp - ??????????? ???????? ????????? ????????
???????? ???????????? ?sp ????????? ???????:
?sp = 0,9 - ??? ????????????? ??????? ???????????????? ??????????;
?sp = 1,1 - ??? ??????????????? ??????? ???????????????? ??????????.
?????? ?????????? ??????????? ??????? ???????? ?? ??????? ????????? ???????, ??????????? ? ?????????? ??? ??????
1-? ??????? ??????????????: A????? = ?????, ?? ???? 0,25*p*d2 = b*h
2-? ??????? ??????????????: J????? = J????, ?? ???? p*d4/64 = b*h3/12
d = 160??, b = 145,1??, h = 138,6??
bf - ?????? ????? ???????????? ???????, bf = 1160??;
bt - ?????? ????? ???????????? ???????, bt = bf - 6*b = 1160 - 6*145,1 = 289,4??;
hf - ?????? ????? ???????????? ???????, hf = 0,5(h? - h) = 0,5(220 - 138,6) = 40,7??;
h? - ?????? ???????????? ???????(??????????? ??????? ??????), h? = 220??;
asp - ?????????? ?? ?????? ??????? ??????? ??????????? ??????? ?????????????? ??????????? ???????? Asp ?? ?????? ????? ???????, asp = a?? + 0,5*dsp, asp = 25
Asp - ??????? ??????????? ??????? ?????????????? ??????????? ????????.
??? ??? ????????????? ????????? ??????? ? ????????? fint = 60% ? ?????? ???????? ??????? ?????????, ?? ??????????? ???????? a?? = 15??(??? ???????? ???????? dsp = 15??).
??? = 15?? ? ??? = dsp
????????? h0 - ??????? ?????? ???????:
h0 = h? - asp = 220 - 25 = 195??
??????????? ??????? ?????? ?????? ?bl ???????? ? ????????? ????????? ????????????? Rb ? Rbt ? ??????????? ??????:
?bl = 1,0 - ??? ?????????????????(???????????????) ???????? ????????;
?bl = 0,9 - ??? ???????????????(??????????) ???????? ????????.
????????? ? - ?????? ?????? ???? ??????:
? = h0 - vh0 2 - 2M / Rb* ?bl*bf = 0,195 - v0,1952 - 2*28,9*103 / 17*106*0,9*1,16 = 0,00785?
? = 7,85?? = hf = 40,7??, ?????????????, ??????? ?????? ???? ?????? ???????? ? ?????.
?sp,? = ?bl*Rb*bf*x / Rs = 0,9*17*1,16*0,00785 / 695 = 0,0002?2 = 2??2
?????? 3d10 ?800 ? ???????? ?sp = 2,36??2
???????? ???????? asp c ?????? ???????? ???????? dsp = 10??:
asp = 25?? = a?? + 0,5*dsp = 15 + 0,5*10 = 20?? - ??????? ???????????
??????????? ?????????????? ????????????? ???????????? ??????????? ??????? ?????????????? ??????
a - ??????????? ?????????? ???????? ? ??????:
a = Es / Eb = 2,0*105 / 3,25*104 = 6,15
?red - ??????? ???????????? ??????????? ??????? ??????:
?red = 2*4,07*116 + 28,94*13,86 + 6,15*2,36 = 1359,8??2
St,red - ??????????? ?????? ??????? ???????????? ??????????? ??????? ?????? ???????????? ???????? ??????????? ??????? ??????:
St,red = S Ai*yi , ??? Ai - ??????? i-?? ?????????????? ??????, ???????????? ??????????? ???????; yi - ?????????? ?? ?????? ??????? i-?? ?????????????? ?????? ?? ???
St,red = 4,07*0,5*116*4,07+28,94*13,86*(0,5*13,86+4,07)+4,07*116(0,5*4,07+13,86+4,07)+
+6,15*2,36*2,5 = 14835,1??3
?t - ?????????? ?? ???????? ??????????? ??????? ??????:
?t = St,red / Ared = 14835,1/1359,8 = 10,9??
Ired - ?????? ??????? ???????????? ??????????? ??????? ???????????? ??? ??:
Ired = S Ii0-0 = S (Ii????? + ?i*ai2); I???? = b*h3 / 12; I????? = p*d4 / 64 - ??????????? ???????? ??????? ????????????; Ired = 2*116*4,073 / 12 + 4,07*116*(10,9 - 0,5*4,07)2 + 4,07*116(22,0 - 0,5*4,07 - 10,9)2 + 28,94*13,863 / 12 + 28,94*13,86(0,5*22,0 - 10,9)2 + 6,15*2,36(10,9 - 2,5)2 = 1303,44 + 37103,07 + 38796,09 + 6421,06 + 4,01 + 1024,11 = 84651,78??4
Wred = Ired / yt = 84651,78 / 10,9 = 7766,22??3
W'red = Ired / (h? - yt) = 84651,78 / (22,0-10,9) = 7626,28??3
?????????? ?? ?? ???????????? ??????? ?? ??????? ??????? ?????:
rsup = Wred / Ared = 7766,22 / 1359,8 = 5,71??
?????????? ?? ?? ???????????? ??????? ?? ?????? ??????? ?????:
rinf = W'red / Ared = 7626,28 / 1359,8 = 5,61??
?????????? ?????? ???????????????? ?????????? ? ??????????? ??????? ????????
????????? ?????? ?? ?????????? ??????????????? ?????????? ? ???????? - ?ssp1:
?ssp1 = 0,1*?ssp,0 - 2,0 = 0,1*620 - 2,0 = 60???
?ssp,0 - ???????? ???????? ???????????????? ??????????, ?????? ?ssp,0 = 620???
????????? ?????? ?? ?????????????? ???????? ??? ??????????? ????????? ??????????? - ?ssp2:
?ssp2 = 0, ??? ??? ?????????????? ???????? ???: ?t = 0
????????? ?????? ?? ?????????? ???????? ????? - ?ssp3 :
?ssp3 = 30???, ??? ??? ??????????? ?????? ? ??????????? ????? ? ?????????? ????????????
????????? ?????? ?? ?????????? ??????? ???????? ????????? - ?ssp4:
?ssp4 = ?l*Es / l = 2*2*105 / 4760 = 84,03???
?l - ??????? ??????? ??? ???????? ??????? ? ??????? ???????, ?l = 2??;
l - ?????????? ????? ????????? ??????? ??????, l = l? + 500 = 4260 + 500 = 4760??;
l? - ?????????????? ????? ??????, l? = 4260??;
Es = 2*105???
?ssp(1) - ?????? ???????? ?????? ?????? ???????????????? ?????????? ???????? ????????????:
?ssp(1) = 60 + 0 + 30 + 84,03 = 174,03???
????????? ?????? ?? ?????? ?????? - ?ssp5:
?ssp5 = eb,sh*Es = 0,0002*2*105 = 40???
eb,sh - ?????????? ?????? ??????, eb,sh = 0,0002 - ??? ?????? ?????? ?30
????????? ?????? ?? ?????????? ?????? - ?ssp6 :
a - ??????????? ?????????? ???????? ? ??????, a = 6,15;
fb,cr - ??????????? ?????????? ??????, fb,cr = 2,3 ??? ?????? ?????? ?=30 ? ????????????? ????????? ??????? ? ????????? fint = 60%;
sbp - ?????????? ? ?????? ?? ?????? ?? ??????????? ????????; ?(1) - ?????? ???????????????? ??????? ? ?????? ?????? ??????, ?(1) = (ssp,0 - ?ssp(1))*?sp = (620 - 174,03)*2,36 = 1052,49???*??2 = 105,25??;
eop = yt - asp = 109 - 25 = 84??;
??? - ??????????? ??? ?????, ?? ??????????? ???????? g?n, ??? = g?n*b??*l02 / 8 = 2939,2*1,2*4,132/8 = 7520,05?*? = 7,5??*?. sbp = ?(1) /Ared + (P(1)*eop - M??)*eop /Ired = 105,25*103/1359,8 + (105,25*103*8,4 - 7,5*105)*8,4/84651,78 = 77,40 + 13,30 = 90,7?/??2 = 0,907??? > 0
sbp > 0, ?????????????, ????? ?? ?????? ?? ??????????? ???????? ????.
�sp - ??????????? ???????????, �sp = Asp / Ared = 2,36/1359,8 = 1,74*10-3
?ssp6 = 0,8*a*fb,cr* sbp / 1 + a* �sp*(1 + eop2* Ared/Ired)(1 + 0,8* fb,cr) = 0,8*6,15*2,3*0,907 / 1 + 6,15*1,74*10-3(1 + 8,42*1359,8/84651,78)(1 + 0,8*2,3) = 10,26/65,73*10-3 = 156,09???
?ssp(2) - ?????? ???????? ?????? ? ?????? ?????? ???????????????? ?????????? ????????, ?ssp(2) = ?ssp(1) + ?ssp5 + ?ssp6 = 174,03 + 40 + 156,09 = 370,12???
?ssp(2) = 370,12??? > 100???, ??????? ???????????.
???????? ????????? ?????? ?? ???????, ??????????? ? ?????????? ??? ??????, ?? ???????? ??????????? ???????
?R = 0,8 / (1 + es,el / eb,ult), ??? es,el - ????????????? ?????????? ???????? ?????????? ????, ????????? ??????? ????????? ??? ?????????? ? ???? ???????? ??????????, ??????? Rs; eb,ult - ????????????? ?????????? ??????? ?????? ??? ???????????, ?????? Rb, ??????????? ?????? 0,0035.
es,el = Rs + 400 - ssp / Es , ??? ssp - ??????????????? ?????????? ? ???????? ? ?????? ???? ?????? ? ?sp = 0,9; 400 - ? ???.
ssp = ssp,0 * ?sp - ?ssp(2) = 620*0,9 - 370,12 = 187,88???
ssp,0 - ???????? ???????? ???????????????? ??????????
es,el = 695 + 400 - 187,88 / 2,0*105 = 0,00453;
?R = 0,8 / (1 + 0,00453/0,0035) = 0,8/2,29 = 0,3493
?????? ?? ????????? ??????? ?????????? ?????????:
? = ?ult , ??? ? - ?????????? ?????? ?? ??????? ????????; ?ult - ?????????? ?????????? ??????, ??????? ????? ???? ????????? ???????? ????????.
? = 28,9??*? - ?????????? ?????? ?? ?????? ????????? ????????.
???????? ?????????? ??????? ? = ?R:
? = ? / h0 = 7,85 / 195 = 0,0402 = ?R = 0,3493
????????? ?????????????? ???????? ?????? ?????? ???? ?????? ? ? ?????? ???????? ???????? Asp:
? = Asp*Rs / bf*Rb*?bl = 2,36*695/116*17*0,9 = 0,924??
? = 9,24 ?? < hf = 40,7??, ?????????????, ??????? ?????? ???? ?????? ???????? ? ?????
? = ? / h0 = 9,24 / 195 = 0,0474
? = 0,0474 = ?R = 0,3493 - ??????? ???????????
?????????? ??????? ? = ?R ??????????, ??? ? ????? ?????? ?????????? ?????????? ?????????????? ???????????.
????????? ???????? ?ult ??? ?????????? ????????? ??? ? = ?R :
Mult = Rb* ?bl*bf*x(h0 - 0,5*x) = 17*0,9*116*0,924(19,5 - 0,5*0,924) = 31220,7???*??3 = 31,22??*?
? = 28,9??*? < Mult = 31,22??*? - ??????? ??????????? ??????????? ??????? ????? ?? ??????????? ??????? ??????????.
????? ???????, ????????? ?????? ?? ???????, ??????????? ? ?????????? ??? ??????, ?? ???????? ??????????? ??????? ??????????.
???????? ???????????? ?????????????? ?????????? ??????????? ??????????? ??????? ? ?????????????? ?????????? ??????? ??????????? ??????? ????????:
Asp,? = 2,0??2 ? Asp = 2,36??2, ?A = 18%
? = 28,9??*? ? ?ult = 31,22, ?? = 8%, ????? ??????? ?A > ??
?????????????? ?????????? ?????????? (?????????) ???????? ?????? ?? ?????????????? ?????????? ? ?????? ??????????? ??????? ???????
? ???????? ??????, ? ????? ? ?????????????? ?????? ??????? ????? 300??, ?? ??????? ????????, ??? ?????????? ???? ?? ??????? ?????????????? ?????? ???????, ?????????? ???????? ????? ?? ?????????????.
h? - ?????? ??????????? ??????? ??????, h? - 220??, ?????????????, ? ????? ????????? ???????? ?? ?????????????.
?????? ?? ????????? ???????, ????????? ? ?????????? ??? ??????
?? ???????? ?????????? ???? ?? ????????? ???????
?????? ?????????????? ??????????? ?????????? ????????? ?? ?????????? ???????:
Q = Qb + Qsw
??? Q - ?????????? ???? ? ????????? ??????? ? ?????? ???????? ? ?? ?????????? ??? ????????, ???????????? ?? ???? ??????? ???, ????????????? ?? ???? ??????? ?? ???????????????? ?????????? ???????; Qb - ?????????? ????, ?????????????? ??????? ? ????????? ???????; Qsw - ?????????? ????, ?????????????? ?????????? ????????? ? ????????? ???????.
Qsw = 0
Q = Qmax - qn(c + 0,5*b??), ??? Qmax - ?????????? ???? ?? ?????? ????????? ????????, Qmax = 28??; q? - ?????? ????????? ???????? (????????), q? = 13569,5?/?; b?? - ???????? ???????? ?????? ?? ??????, b?? = 130??.
?????? ? = 2,0*h0
? = 2,0*h0 = 2,0*0,195 = 0,39?
Q = Qmax - q?(? + 0,5*b??) = 28 - 13569,5(0,39 + 0,5*0,13)*10-3 = 21,8??
????????? ?????????? ???? Qb :
Qb = fb2*Rbt*b*h02*?bl / c
??? ???? ?????? ??????????? ???????:
0.5*Rbt*b*h0* ?bl = Qb = 2,5*Rbt*b*h0* ?bl
fb2 = 1,5; b - ?????? ????? ???????????? ???????????? ???????, b = bf = 289,4??
Rbt = 1,2???
Qb = 1,5*1,2*106*0,9*0,2894*0,1952/0,39 = 45710,7? = 45,7??
??????? ??????:
Qb,max = 2,5*Rbt*b*h0* ?bl = 2,5*1,2*106*0,9*0,2894*0,195 = 152369,1? = 152,4??
?????? ??????:
Qb,min = 0,5*Rbt*b*h0* ?bl = 0,5*1,2*106*0,9*0,2894*0,195 = 30473,8? = 30,5??
Qb,min = Qb = Qb,max - ??????? ???????????
Q = 21,8?? < Qb = 45,7??, ?????? ????????? ???????, ?????????? ? ?????????? ??? ??????, ?? ???????? ?????????? ???? ?? ????????? ??????? ??????????.
?? ???????? ?????????? ???? ?? ???????? ?????? ????? ?????????? ?????????
?????????? ?????? ?????????????? ??????????? ??????????? ?? ???????? ?????? ????? ?????????? ?????????:
Q = fbl*Rb*?bl*b*h0 , ??? Q - ?????????? ???? ? ?????????? ??????? ????????; fbl - ???????????, ??????????? ?????? 0,3.
? ????? ????????? ????????? Q = Qmax.
Qmax - ?????????? ???? ?? ?????? ????????? ????????, Qmax = 28,0??
Rb - ????????? ???????? ????????????? ?????? ?? ?????? ??????, Rb = 17,0???;
?bl - ??????????? ??????? ?????? ??????, ??????? ????????? ??????? ???????????? ???????? ??????????? ????????, ?bl = 0,9 - ??? ?????????? ???????? ????????;
h0 - ??????? ?????? ??????? ???????????, h0 = 195??;
b - ?????? ????? ???????????? ???????????? ???????, b = bf = 289,4??;
fbl*Rb*?bl*b*h0 = 0,3*17*106*0,9*0,2894*0,195 = 259027,47? = 259,0??
Q = 28,0?? < 259,0??, ?????? ????????? ???????, ?????????? ? ?????????? ??? ??????, ?? ???????? ?????????? ???? ?? ???????? ?????? ????? ?????????? ????????? ??????????.
?????? ?? ????????? ???????, ????????? ? ?????????? ??? ??????, ?? ???????? ??????????? ??????? ?? ????????? ???????. ???? ??????? ????? ???? ???????? ?????????? ?????????? ??????????? ????????
?????????? ?????? ??????????????? ??????????? ?? ????????? ???????? ?? ???????? ??????????? ???????:
? < Ms + Msw , ??? ? - ?????? ? ????????? ??????? ? ?????? ???????? ? ?? ?????????? ??? ????????, ???????????? ?? ???? ??????? ???, ????????????? ?? ???? ??????? ?? ???????????????? ?????????? ???????, ???????????? ????? ?????????? ???????, ???????????????? ?????, ? ???????? ????????????? ??????????? ?????????? ????????, ???????????? ?????????? ?? ??????? ? ????????? ???????;
?s - ??????, ?????????????? ?????????? ?????????, ???????????? ????????? ???????, ???????????? ???????????????? ????? ?????????? ???????;
?sw - ??????, ?????????????? ?????????? ?????????, ???????????? ????????? ???????, ???????????? ???????????????? ????? ?????????? ???????.
? ????? ?????? Msw = 0.
? = 2,0*h0 = 2,0*0,195 = 0,39?
? = 0,5q?[l0(0,5*b?? + ?) - (0,5*b?? + ?)2], ??? q? - ?????? ????????? ????????, q? = 13569,5?/?; l0 - ????????? ?????? ??????, l0 = 4130??;
? = 0,5*13569,5[4,13(0,5*0,13 + 0,39) - (0,5*0,13 + 0,39)2] = 11344,95?*? = 11,3??*?
Ms = Ns*zs , ??? Ns - ?????? ? ?????????? ?????????? ????????, ??????????? ?????? Rs As zs - ????? ?????????? ???? ???; ??????????? ????????? zs = 0,9h0
zs - ?????????? ?? ???????????????? ?????? ? ?????????? ?????????? ???????? ?? ???????????????? ?????? ? ?????? ???? ??????
zs - ????? ??????????? ???????
????????? ??????? ????? ????????? ??????????? ????????, ??????????? ??? ???????? ?????? ? ???????? ? ?????? ????????? ????????? ????????????? Rs ?? ?????:
l0,an = Rs*As / Rbond *us, ??? l0,an - ??????? ????? ????????? ??????????? ????????; Rs - ????????? ???????? ????????????? ???????? ??????????; As - ??????? ??????????? ??????? ????????????? ??????? ????????, ???????????? ?? ???????????? ???????? ???????; us - ???????? ??????????? ??????? ????????????? ??????? ????????, ???????????? ?? ???????????? ???????? ???????; Rbond - ????????? ????????????? ????????? ???????? ? ???????, ??????????? ?????????? ?????????????? ?? ????? ?????????.
Rs = 695???; As = 0,785 ??? ??????? 10????????; us = p*ds = 3,14*1 = 3,14??
Rbond = ?*Rbt , ??? Rbt - ????????? ????????????? ?????? ??????? ??????????; ? - ???????????, ??????????? ??????? ???? ??????????? ????????, ??????????? ?????? 2,5 ??? ?????????????? ? ? ???????????????? ???????????? ???????? ?????? ?.
Rbt = 1,2??? ??? ?????? ?????? ?30; Rbond = ?*Rbt = 2,5*1,2 = 3???;
l0,an = Rs*As / Rbond *us = 695*0,785/3*3,14 = 57,92??
????????? ????????? ????????? ????? ?????? ????????? ??????????? ???????? ? ?????? ??????????????? ??????? ???????? ? ???? ?????????:
lan = l0,an*As,cal/As,ef , ??? lan - ????????? ????????? ????? ?????? ????????? ??????????? ????????; As,cal - ??????? ??????????? ??????? ????????, ????????? ?? ???????; As,ef - ??????? ??????????? ??????? ????????, ?????????? ?????????????.
??? ???? ?????? ??????????? ???????: lan = 15 ds ? lan = 200?
As,cal = Asp,? = 2,0??2 - ????????? ??????? ??????????? ??????? ?????????????? ??????????? ????????
As,ef = Asp = 2,36??2 - ???????? ??????? ??????????? ??????? ?????????????? ??????????? ????????
lan = l0,an*As,cal / As,ef = 57,92*2,0/2,36 = 49,08??;
49,08?? = 15ds = 15*1 = 15?? ? 49,08 = 20?? - ??????? ???????????;
lan = 49,08??
?s,an - ??????????? ??????? ?????? ?????????? ??????????? ????????, ??????????? ????????????? ????? ????????? ???????? ? ???? ??????:
?s,an = lx/lan, ??? lx - ?????????? ?? ?????? ???? ???????? ??????????????, ?? ???? ?? ????? ??????, ?? ???????????????? ???????, ?? ???? ?? ?????? ????????? ???????; lx - ????? ?????? ???????? ?? ????? ????????? ?????, ?? ???? ????? ???????? ???????? ?????;
lx = b?? = 13??
?s,an = lx/lan = 13/49,08 = 0,265
????????? ????? ???????? ???????? ?, ?????? ?? ??????? ????????? ??????, ?????????????? ?????????? ????????? ? ?????? ???????:
x = Asp*Rs* ?s,an / bf*Rb*?bl = 2,36*695*0,265/116*17*0,9 = 0,245??
zs = h? - asp - 0,5 x = 22 - 2,5 - 0,5*0,265 = 19,37??
Ms = Rs*Asp*zs* ?s,an = 695*2,36*19,37*0,265 = 8419,23???*??3 = 8,42??*?
? = 11,3??*? > Ms = 8,42??*?, ?????????????, ????????? ?????????? ??????? ????? ?? ????????? ????? ?? ???????? ??????????? ??????? ?? ????????? ??????? ?? ??????????. ????? ???????, ??????? ?????????? ?????? ? ?? ??????? ?? ????? ???? ????????? ?????? ?????????? ????????? ??-?? ????? ????? ?????????. ?????????????, ?????????? ?????????? ? ????? ?????????? ????????.
0,5h0 = 0,5*19,5 = 9,75??; 0,75h0 = 0,75*19,5 = 14,625??
?????? ?????????? ??????????? ? ???? ???? ?????????? ????? ?-1 ?? ???????? ?????? ?500. ????????? ??????? ? ????????? ?????????? ??????? ????????? 3??.
????????? ?????? Msw ??? ?????????? ????????, ?????????? ? ?????????? ??? ????????:
Msw = 0,5Qsw*c, ??? Qsw - ?????? ? ?????????? ????????, ??????????? ?????? qswc; qsw - ?????? ? ?????????? ???????? ?? ??????? ????? ????????:
qsw = Rsw*Asw / sw , ??? sw - ??? ??????????? ?????????? ????????
Rsw = 300??? ??? ???????? ?????? ?500;
Asw = 0,071??2 ??? ??????? ????????? 3;
sw = 5??;
qsw = Rsw*Asw / sw , ??? sw = 300*0,071/5 = 8,52???*?? = 85,2??/?;
Qsw = qswc = qsw2h0 = 85,2*2*0,195 = 33,2??;
Msw = 0,5Qswc = 0,5Qsw2h0 = 33,2*0,195 = 6,47??*?;
M = 11,3??*? < ?s + Msw = 8,42 + 6,47 = 14,89??*?, ?????????????, ????????? ?????????? ??????? ????? ?? ????????? ????? ?? ???????? ??????????? ??????? ?? ????????? ??????? ??????????.
??????????????? ???????????????? ??????????? ??????
??????????? ???????? ??????? ????????? ???? ?????? ??? ??????? ???????? ? ????? ?????? ????? 15??. ??????, ??????????? ???????? ??????? ????????? ???? ?????? ??? ?????????????? ???????? ? ????? ?????? ????? 10??(??? ???????? ??????? ?? ????? 10??).
????????? ????? ???? ???????? ???????????????? ?????????? ?? ????? lp ??? ???????? ??? ?????????????? ?????????? ?????????:
lp = ssp*As / Rbond*us , ??? ssp - ??????????????? ?????????? ? ??????????? ???????? ? ?????? ?????? ??????; As - ??????? ??????????? ??????? ??????? ????????, ???????????? ?? ???????????? ???????? ???????; us - ???????? ??????????? ??????? ??????? ????????, ???????????? ?? ???????????? ???????? ???????; Rbond - ????????? ????????????? ????????? ??????????? ???????? ? ???????, ?????????? ???????????? ????????? ??????
lp ?????? ???? ?? ????? 10dsp ? 200??.
ssp,0 - ???????? ???????? ???????????????? ??????????, ssp,0 = 620???
? ssp(1) = 174,03??? - ?????? ???????? ?????? ?????? ???????????????? ?????????? ????????
ssp = ssp,0 - ? ssp(1) = 620 - 174,03 = 445,97???;
As = 0,785??2 ??? ??????? ????????? 10;
us = pds = 3,14*1 = 3,14?? ??? ??????? ????????? 10;
Rbond = 3???;
lp = ssp*As / Rbond*us = 445,97*0,785 / 3*3,14 = 37,16??;
lp > 10dsp = 10?? ? lp > 20?? - ????????? ?????????? ???????????;
0,6lp = 0,6*37,16 = 22,29??
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