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ID number:933181
 
Evaluation:
Published: 30.11.2010.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

Masīva pamata aprēķins
2. Pamata pēdas minimālā dziļuma un pamata augšmalas atzīmes noteikšana un
pamatojums:
Pamata augšmalu pieņemu 0,2m virs gultnes līmeņa, kas iekļaujas noteikumos
paredzētajās robežās: vismaz 0,5m zem ZŪL, kas šajā gad. ir 0,7 m virs gultnes.
Tā kā grunts izskalošanas dziļums nav dots, tad drošības apsvērumu dēļ pieņemsim, ka
pamata augstums H = 6.0m, tātad pamata pēdas minimālais dziļums ir 5,8m zem gultnes
līmeņa.
3. Pamata pēdas izmēru robežas un īsto izmēru pieņemšana:
bmin.= b0 + 2Cy = 2 + 2*0,2 = 2,4m;
amin .= a0 + 2Cy = 7 + 2*0,2 = 7,4m;
bmax. = b0 + 2hp*tgφ = 2 + 2*6*0,577 = 6,62m;
amax. = a0 + 2hp*tgφ = 7 + 2*6*0,577 = 13.92m;
Pieņemu: a = 12 m, b = 6 m
4. Momentu noteikšana pamata pēdas līmenī:
Fx = T + W1 = 246 + 15 = 267.4 kN – slodze tilta garenvirzienā
Fy = W2 + W3 = 65 + 589 = 915.6 kN – slodze tilta šķērsvirzienā
My = T*a1 + W1*a2 = 353(5.8 + 7) + 54(3.5+5.8) = 3349.22 kN*m
Mx = W2*a1 + W3*a2 = 65(7.9 + 5.8) + 589(5.5 + 5.8) = 10564.7 kN*m
6. Pamata tilpums un pašsvars:
Vp = a*b*h = 12*6*6 = 432 m3
Gp = Vp*Υb*Υf = 432*22,5*1,3 = 12636 kN
7. Spriegumi pamata pēdas līmenī
pmax = (2P+G+ Gb + Egr +Gp) / A) + My / Wy + Mx / Wx =
(2*1400+7970.3+2784.6+12636)/72 + 3349.22/72 + 10564.7/144 = 483.64 Kpa
R = 1,7{R0[1 + k1(b - 2)] + k2*Υgr(d - 3)} =
=1,7{243[1 + 0,04(6 - 2)] + 2*18.34(5.8 - 3)} = 653.79 kPa
480.86 < 1.2 * 653.79 / 1.4
480.86 < 560.39
Wy = a*b2/6 = 12*6*6/6 = 72
Wx = a2*b/6 = 12*12*6/6 = 144
569.39/480.86* 100 = 115%…

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