Ground Bearing Pressure Below Crane Mats

Job Information

Project
Customer
Description
Drawn By
Date

Crane Information

Mat Information

Calculations

Pressure loss per track length...

Ploss = (P1 - P2 ) / L

Average pressure into critical mat...

Pavg = ½ (2·P1 - b·Ploss)

Total pressure into critical mat...

P = Pavg·b·W

Ground Bearing Pressure below mat...

q = P / (b·c)

Ground Bearing Pressure including mat weight...

qtot = q + mat weight

Bending Stress on Mat...

f = 3·q·a²·n/d²    

1200 psi maximum allowed

Horizontal Shear Stress on Mat...

V = 1.5·q·a/d    

100 psi maximum allowed

Bending Force on Mat...

M = (q·b·a²)/2
Mallowable = (Fy·Zx·#) / (1.67·12)

Shear Force on Mat...

V = q·b·a
Vallowable = (0.6·Fy·h·tw·#) / 1.5

Notes

Not for construction use. For pre-planning only.