Addendum_A__09-02-2011_Crane_Pedestal_Structural_Analysis.pdf
PDF 160 KB Posted
- Attached to
- Buoy Barge Pedestal Crane Federal contract opportunity
- Solicitation number
- DTSL5517R0010
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Structural Analysis
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Text version
Addendum A
WORK SPECIFICATION ITEM NO: #002 (Crane Replacement)
Vessel: SLSDC Buoy Barge BPL 6704
MSC 3210-003-22
Structural Feasibility Analysis for Re-Use of the Existing Crane Pedestal to Support a Replacement Crane
The dimensions of crane pedestal are 66” diameter x 0.5” thickness
Moment of Inertia of Section: I = π d4/64 = π x (664-654) / 64 = 55,180 in4
Cross section area of pedestal = π d2/4 = 103 in2
The approximate vertical loading on the crane pedestal = 110,000 (hook load) + 75,000
(crane) = 185,000 lb.
Pedestal Axial Loading: 185,000 lb / 103 in2 = 1,796 lb/in2
To determine allowable axial loading (Fa)
Axial Compression Loading
(Ref: AISC Steel Building Spec.)
Section Area 103 In^2
Moment of Inertia 55180 In^4
"K" factor 2
Material Yield Stress 36 KSI
Unrestrained Length 96 In.
E Modulus 29000 KSI r (Radius of Gyration) 23.15 In.
Kl/r 8.30
Cc 126.10
Fa 21.24 KSI
The estimated moment loading on the pedestal is the sum of the max hook load moment from the adjusted crane capacity table (1,911,039 lb-ft) plus the moment created by the crane at the same boom elevation (-32,675 lb-ft) = 1,878,364 lb-ft. (The net moment is reduced by the counterweights of this example replacement crane.)
The bending stress on the pedestal: fb = mc/I = (1,878,364)(12)(66/2) / 55,180 fb = 13,480 lb/in2
Allowable stress in simple bending Fb = 0.66 Fy = (0.66)(36ksi) = 23.76 ksi
Combining axial and bending: fa/Fa + fb/Fb = (1.80/21.24) + (13.48/23.76) = 0.65
A value less than 1.0 indicates that the combined axial and bending stresses are within the acceptable range.
This feasibility analysis predicts that the existing pedestal will be adequate for supporting a replacement crane of the assumed configuration. A more detailed analysis will be required when a replacement crane is identified and more precise information on the crane is available. In the event that the loading has been somewhat underestimated in this analysis, there will be the opportunity to increase the section properties of the pedestal by adding reinforcement.
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