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Q. The base of the freeway sign is attached to its foundation with four bolts.The four bolts must be able to resist the twisiting of the pole that is caused by the wind. Assume each bolt carries the same force. If the diameter of the bolt circle is 0.9m, calculate the horizontal (shear) force on each of the bolts due to the twisitng moment about the y - axis.

Let me describe, the measurements in the figure :

12.6 kN is the force of the wind on the sign.

10.5 k N is the weight of the sign acting downward

Distance from O to the positive direction of the x - axis is 5 m. (not indicated in the attached file )

Distance from O to positive direction of z is 9.75 m.

Please help me how to start this problem.

I hope the attached sketch helps you folks.

Thanks

Let me describe, the measurements in the figure :

12.6 kN is the force of the wind on the sign.

10.5 k N is the weight of the sign acting downward

Distance from O to the positive direction of the x - axis is 5 m. (not indicated in the attached file )

Distance from O to positive direction of z is 9.75 m.

Please help me how to start this problem.

I hope the attached sketch helps you folks.

Thanks