2017-11-29_REVISION - C1981038

• Permit No: C1981038
• IBM Index Class Name: Revision
• Doc Date: 11/29/2017
• Doc Name: Report of Culvert Condition
• From: Steven K. Harper, LLC
• To: DRMS
• Type & Sequence: RN7
• Email Name: CCW
• Media Type: D
• Archive: No

Bridge No:Bowie Resources PID Number:
SFN:N/A Project No:
Year Built:~1975 Load Rated By:JR Date:
Bridge Type:Corrugated Metal Pipe Checked By:LH Date:
LRFR of In-Service, Corrugated Metal Pipe Structures
N/A
11/16/2017
11/16/2017
if:
Compare: S (in) = 60.00 <194.91
Therefore,fcr = 42.87 ksi
Calculate the Tcap (thrust capacity of the wall) :
Seam Strength (k/ft) = 28.7
41.2
53.5
19.2
Therefore,Tcap = 19.2 k/ft
Calculate the TE (pipe wall thrust due to earth cover) :
1. δ H (S/2) = 3.60 k/ft
2. δ H Rt =7.92 k/ft
Therefore,TE = 7.92 k/ft
Calculate the T(L+I) (pipe wall thrust due to live load plus dynamic load allowance) :
k/ft
k/ft
Based on AASHTO LRFD 3.6.1.1.2-1:
1.2 ← one lane loaded assumed here
0.90 See AASHTO LRFD C3.6.1.1.2
1.08
Based on AASHTO LRFD 3.6.2.2:
where,
For this structure: Depth of Fill, DE = H=12.00 ft
IM =0%
(1+IM) =1.00
Calculations will be based on AASHTO LRFD 3.6.1.2.5 & 6:
1. wall yield strength = φ1 φloss Fy A =
TE = higher value of :
T(L+IM) = higher value of :
1. ρ (L+IM) (S/2) =
2. ρ (L+IM) Rt =
DE = the minimum depth of earth cover above the structure (ft)
33(1.0-0.125 DE) ≥ 0%
Multiple Presence Factors, m =
adjust m based on ADTT =
2. wall buckling strength = f φ1 φloss fcr A =
3. seam strength = φ2 x (seam strength) =
Tcap = less of:
after ADTT adjustment, madj =
Live load Dynamic Load Allowance, IM =
ρ (L+IM) : pressure at crown due to live load plus dynamic load allowance
Wheel Load P, P=1/2 Axle
48 rEFkmu
( )
2/
12,24
rkS
Efthen
F
E
k
rS m
cr
u
m =>
=
u
m
F
E
k
r 24
Tire Contact Area
Wheel Load P, P=1/2 Axle Load
Saxle
P
PLD
LD
LD
P
PDirection of Travel
Revised by ODOT 5/2016 Page 6 of 10