Documents

Underground Pipe Stress Check

Description
Underground Pipe Stress Check
Categories
Published
of 6
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  Design Calculation Project No. Project Title:Checked By:Date:Oct/15/14Date: PIPE STRESSES - WHEELS ON RIGID PAVEMENTEarth Loading Pipe Size =   42 in.Conc. Thick. hc = 8 in.O.D. =42in.wd = Cd w Bd^2 = 1316.6 lb / lin ft.where:w = 120 lb/ft^3 soil unit wt.Bd = 5 ft. (actual width)Bd =5.0ft. (effective width)Bc = O.D. =3.50ftCd = 1 - e^ (-2 ku'(H/Bd))=0.439H = 2.33 ft.ku' = 0.13 lb / in^3ku' = modulus of subgrade reactionSaturated clay = 0.110Ordinary clay = 0.130Saturated topsoil = 0.150Sand and gravel = 0.165Bd max. = Transitional trench width from table below Ref. 1 = 5 ft. Table 13 to 28  Bd = Max. effective transitional trench width Bd Pipe Cover = H ( ft. ) Pipe Dia.5678910152061.421.51.581.671.751.752.082.3381.751.831.92222.082.422.75122.52.582.752.832.9233.333.671633.083.173.253.333.423.834.25183.423.53.583.753.833.924.334.75244.254.334.54.584.674.835.255.67304.835.175.335.425.585.676.176.67365.425.756.176.256.426.587.087.58425.926.336.677.087.257.427.928.42486.56.927.257.678.088.178.839.33547.087.427.838.178.5899.6710.25607.6788.428.759.089.510.511.08For shallow depths (< 4ft.) use :wd = H Bc w =978.6 lb / lin ft.Therefore wd =978.6 lb / lin ft.+ wt. of concrete =350lb / lin. Ft.wd total = 1328.6 lb / lin ft. N:\civil\spreadsh\UGPipes\u-g pipe.xls (1 of 3) Wheel Loading 2 ku'   Underground Pipe Stress Check - UGP 2 BcBdHP X P1P4 hc  From Individual Wheel LoadsTire Pressure = 80 psi.Impact Factor = Fi =1.2671.5 at surface Ref. 2 , 4.7.2.2.2  1.0 @ H = 5 ft.k mod. of subgrade reaction 200 lb / in^3Ec conc. = 3400000 psi Ref. 4  WheelPXA contactLH / LX / LPress. Coef.Pressure#( lbs. )( ft. )( ft. ^2 )( ft. ) ( C from below) Top Pipe (lb./ft^2)1 175000.00 1.922.450.950.00 0.0825 Ref 4  1204.22 175007.00 1.922.450.952.86 0.013 Table 1 189.73 1750021.20 1.922.450.958.67 0 0.04 1750020.00 1.922.450.958.18 0 0.05 0.00 0.002.450.950.000.06 0.00 0.002.450.950.000.0Total: = 1393.9 Pressure Coeficient CC X / LH / L0.00.40.81.21.62.02.42.83.23.640.00.1130.1050.0890.0680.0480.0320.0200.0110.0060.0020.0000.40.1010.0950.0820.0650.0470.0330.0210.0110.0040.0010.0000.80.0890.0840.0740.0610.0450.0330.0220.0120.0050.0020.0011.20.0760.0720.0650.0540.0430.0320.0220.0140.0080.0050.0031.60.0620.0590.0540.0470.0390.0300.0220.0160.0110.0070.0052.00.0510.0490.0460.0420.0350.0280.0220.0160.0110.0080.0062.40.0430.0410.0390.0360.0300.0260.0210.0160.0110.0080.0062.80.0370.0360.0330.0310.0270.0230.0190.0150.0110.0090.0063.20.0320.0300.0290.0260.0240.0210.0180.0140.0110.0090.0073.60.0270.0260.0250.0230.0210.0190.0160.0140.0110.0090.0074.00.0240.0230.0220.0200.0190.0180.0150.0130.0110.0090.0074.40.0200.0200.0190.0180.0170.0150.0140.0120.0100.0090.0074.80.0180.0170.0170.0160.0150.0130.0120.0110.0090.0080.0075.20.0150.0150.0140.0140.0130.0120.0110.0100.0080.0070.0065.60.0140.0130.0130.0120.0110.0100.0100.0090.0080.0070.0066.00.0120.0120.0110.0110.0100.0090.0090.0080.0070.0070.006Total Wheel Pressure at Top of Pipe =1393.9lb / ft.^2 Pipe Stresses Pipe Dia. O.D. =42in.Young's Mod. E = 30000000 psi.Wall thickness t = 0.50 in.Poisson's Ratio = 0.3 Pipe Grade = X65 Coef. Thermal Exp. = 0.0000065 per deg FSMYS = 65000 psi.Pipe Operating Pres. = 1000.0 psi.Temp. @ Pipe Installation = 10 deg. FSMYS design factor F = 0.8 Max./Min. Operating Temp. = 170 deg. F Circumferential Stress Due to Earth Load Ref. 2  She = Khe Be Ee lamda D = 2756.3psi.where:Khe = soil/pipe stiffness coef. = 4500 Fig. 3  t / d =0.011905 (set E' = 1.0)  Value by Ref 1 (above) = 978.6psi.Be =0.21 Fig. 4  where H/Bd =0.665714 (Soil Type B for trenches)  Use largest Value set SHe =2756.3psi.Ee =1  (for trenched constuction) + wt. Concrete = She tot. = 2756.9psi.lamda = unit wt. Soil =120lb / ft^3D = 42in (2 of 3) Wheel Load Stress w =9.68psi. from above         X   X Sum loadsat this pointr P2P3   L  where:KHh = circumf. stiffness factor =12.5 Fig. 14  Cyclic Circumferential Stress where: t / d =0.011905 Set Er = 10  SHh = KHh GHh R L Fi wGHh = geometry factor =   0.96  from Fig. 15 = 86.10psi. GHh H, soil cover ( ft. ) Fig. 15  Pipe dia.3 - 46810Cyclic Longitudinal Stress61.451.150.90.7121.281.050.850.67SLh = KLh GLh R L Fi w181.080.950.770.63= 55.96psi.241.120.850.730.58301.070.80.680.54361.010.760.640.5 Internal Pressure Circumferential Stress 420.960.720.60.46480.920.690.550.43Shi = p (D - t ) / 2 t540.870.660.510.41= 41500psi.600.850.630.470.38R = pavement factor = 0.90 Ref. 2  ==>L = Axle configuration = 0.65 Table 2  Limits of Calculated Stress KLh = long. Stiffness factor =10 Fig. 16  1.) Check Pressure Stress using Barlow formula where t / d = 0.011905 Set Er = 10  GLh = geometry factor = 0.78  from Fig. 17 SHi (Barlow) = p D / 2 t< or = F E T SMYS (natural gas) GLh H, soil cover ( ft. ) Fig. 17  < or = F E SMYS (liquids)Pipe dia.3 - 4681061.551.451.351.25where:F = design factor = 0.8 Ref. 3  101.231.110.9E = joint factor = 1.0 Ref. 2  121.151.020.880.8T = temp. derating = 1.0 181.10.930.830.7241.020.870.750.57300.940.80.690.53SHi (Barlow) = 42000psi360.860.730.630.48< =52000 (nat. gas) OK420.780.650.580.44< =52000 (liquids) OK480.70.580.520.4540.620.510.460.36600.540.440.410.322.) Check Total Effective StressSeff =SQRT [ 1/2 ( (S1 - S2)^2 + (S2 - S3)^2 + (S3 - S1)^2)] < or = SMYF FS1 = SHe + SHr + SHi =44343psiS2 = SLr - Es Coef. Thermal Exp. (T2 - T1) + poisons ratio ( SHe + SHi) =44533psiS3 = - P =-1000.0psiS eff =32130psi< or =52000psi OK -- Stress within allowables References: 1. )Concrete Pipe Design Manual ACPA 5th Printing June 19802. )API Recommended Practice 1102 Steel Pipelines Crossing Railroads and Highways 6th Editition 19933. )CAN/CSA Z183 - M904. )PCA Vertical Pressure on Culverts Under Wheel Loads on Concrete Pavement Slabs5. )PCA Concrete Floors on Ground(3 of 3)  Design Calculation Project No. Project Title:014173Checked By:Date:Oct/15/14Date: PIPE STRESSES - WHEELS ON UNPROTECTED FILLEarth Loading Pipe Size =   42 in.O.D. =42in.wd = Cd w Bd^2 = 1666.6 lb / lin ft. Ref. 1 where:w = 120 lb/ft^3 soil unit wt.Bd = 5 ft. (actual width)Bd =5.0ft. (effective width)Bc = O.D. =3.50ftCd = 1 - e^ (-2 ku'(H/Bd))=0.556H = 3 ft.ku' = 0.13 lb / in^3ku' = modulus of subgrade reactionSaturated clay = 0.110Ordinary clay = 0.130Saturated topsoil = 0.150Sand and gravel = 0.165Bd max. = Transitional trench width from table below Ref. 1 = 5 ft. Table 13 to 28  Bd = Max. effective transitional trench width Bd Pipe Cover = H ( ft. ) Pipe Dia.5678910152061.421.51.581.671.751.752.082.3381.751.831.92222.082.422.75122.52.582.752.832.9233.333.671633.083.173.253.333.423.834.25183.423.53.583.753.833.924.334.75244.254.334.54.584.674.835.255.67304.835.175.335.425.585.676.176.67365.425.756.176.256.426.587.087.58425.926.336.677.087.257.427.928.42486.56.927.257.678.088.178.839.33547.087.427.838.178.5899.6710.25607.6788.428.759.089.510.511.08For shallow depths (< 4ft.) use :wd = H Bc w =1260.0 lb / lin ft.Therefore wd =1260.0 lb / lin ft. N:\civil\spreadsh\UGPipes\u-g pipe.xls (1 of 3) Wheel Loading From Individual Wheel Loads2 ku'   Underground Pipe Stress Check - UGP 1 BcBdHP X P1P4
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks