ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJAKALAMANAOAPAQARASATAUAVAWAXAYAZBABBBCBDBEBFBGBHBIBJBKBLBMBNBOBPBQBRBSBTBU
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PROJECT :
PAGE : 0
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CLIENT :
DESIGN BY :
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JOB NO. :
DATE :
REVIEW BY :
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Concrete Tunnel Design Based on AASHTO-17th & ACI 318-14
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INPUT DATA & DESIGN SUMMARY
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CONCRETE STRENGTH
fc' =25
ksi, (34 MPa)
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REBAR YIELD STRESS
fy =20
ksi, (414 MPa)
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TUNNEL DIMENSIONS
L =0
ft, (9.75 m), (AASHTO Fig 2.5)
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H =0
ft, (4.88 m), (AASHTO Fig 2.5)
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C =0,0
ft, (3.01 m)
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S =0
in, (406 mm)
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D =0
in, (1524 mm)
< == Tip: Input D = C - S for full circler section tunnel.
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t =0
in, (508 mm)
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REINFORCING (As)
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1layers #1@1
in o.c., (203 mm), (curvered)
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Concrete Cover =
3
in, (76 mm), (AASHTO 8.22.1)
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FACTORED SOIL PRESSURE (SD level, including surcharge & seismic ground shaking)
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Pt =5469
psf, (84 kPa)
Pb = Pt + Wt =
12
psf, (128 kPa)
[THE DESIGN IS ADEQUATE.]
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P1 =11
ft-pcf, (psf), (34 kPa)
P2 =1820
ft-pcf, (psf), (87 kPa)
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ANALYSIS
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DETERMINE TUNNEL FORCES BY FINITE ELEMENT METHOD
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PointX (ft)Y (ft)Pu (k)Mu (ft-k)Vu (k)
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00,000,0024,97124,440,00
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13,400,2225,83116,287,17
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26,730,8727,5191,8711,67
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39,961,9429,9552,1815,69
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413,033,4133,08-1,2119,07
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55,2640,68-66,105,66
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615,897,9841,81-83,433,82
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718,2310,8942,16-95,131,40
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818,6813,9241,52-99,43-1,32
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918,6316,9840,02-95,39-4,02
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1018,0920,0037,82-83,08-6,46
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1117,0622,8834,98-63,29-8,41
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1215,5725,5631,65-37,55-9,61
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1313,6727,9628,09-8,14-9,87
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1411,4030,0124,6222,10-9,12Rt =18,72
ft, (top circle radius)
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158,8331,6821,6050,02-7,37Rb =26,62
ft, (bottom circle radius)
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166,0232,8919,3772,60-4,79 qt =121,95
deg, (between 5 & 18)
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173,0533,6418,1887,28-1,66 qb =36,63
deg, (between 0 & 5)
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180,0033,8918,1892,370,00
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CHECK AXIAL & FLEXURE CAPACITY
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rProvD =0,007605256753<rMAX =0,0400
(tension face only, ACI 318-14 7.3.3 or R21.2.2)
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>rMIN =0,0008(tension face only, ACI 318-14 9.6.1.2, 9.6.1.3 or Table 11.6.1)
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[Satisfactory]
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f Pnf Mn
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AT AXIAL LOAD ONLY
617,40,0
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AT MAXIMUM LOAD
617,417,2
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f Pn (k)
AT MIDDLE
377,3126,1
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AT e t = 0.002
137,2184,6
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AT BALANCED
130,2
186,633435670667hvfdfcghhvvff
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AT e t = 0.005
54,6221,6
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AT FLEXURE ONLY
0,0105,0
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(Note: For middle reforcing the max fMn is at c
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equal to 0.5 t / b1, not at balanced condition.)
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f Mn (ft-k)
[Satisfactory]
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CHECK SHEAR CAPACITY (ACI 318-14 9.6.3.1)
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=20,92kips / ft>Vu, max =19,07kips / ft
[Satisfactory]
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