Question

The billboard sign shown weighs 4000 lb and is supported on a 15 circular hollow steel tube with 3/8 thickness. The sign will be built in west Mobile and is subjected to wind forces with maximum wind speed of 160 mph. The hollow steel tube has a maximum compressive/tensile strength of 50 Ksi and a maximum shear strength of 10 Ksi. Determine if the hollow steel tube has enough axial and shear strength to support loads applied to the sign. Please note that the most severe torque will result when the wind load is applied to the edge of the sign. Use a factor of safety of 2 and assume that the support is fixed in the ground. Show you calculations. Helpful equations ?max-r14 and ?mas _ P Mc 24 6 1.5 19 15 Steel hollow tube Based on the 3/8 thickness Ksi Maximum combined axial stress- Allowable axial stress- Ksi Adequate Inadequate Maximum combined shear stress- Allowable shear stress- Ksi Ksi Adequate Inadequate
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