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MEC2403 Prac 7

P7.1

A box beam of wood is constructed of two 260 mm x 50 mm boards and two 260 mm x 25 mm boards (see figure).

The boards are nailed at a longitudinal spacing s = 100 mm.

If each nail has an allowable shear force F = 1200 N, what is the maximum allowable shear force Vmax?

P7.2

A beam of T cross section is formed by nailing together two boards having the dimensions shown in the figure.

If the total shear force V acting on the cross section is 1600 N and each nail may carry 750 N in shear, what is the maximum allowable nail spacing s?

P7.3

The beam section shown in the figure is subjected to a vertical shear force of 5kN. Each nail can carry a maximum force of 300N. Determine the largest permissible spacing s between the nails.