Shear Flow Built-up Members

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Presentation transcript:

Shear Flow Built-up Members Lecture No. 21 Shear Flow Built-up Members To be able to find Shear Flow and Shear Stress  at glue and at nails.

Shear Flow at a Particular Junction

Example: The beam is constructed from four boards glued together. If it is subjected to a shear of V = 850 kN, determine the shear flow at B and C that must be resisted by the glue.

Solution: Section Properties.

Solution: Shear Flow.

Example: A box beam is to be constructed from four boards nailed together. If each nail can support a shear force of 30 N, determine the maximum spacing s of nails at B and at C so that the beam will support the vertical force of 80 N.

Solution: Internal Shear.

Solution: Shear Flow. Ans.. Ans..

Example: Nails having a total shear strength of 40 N are used in a beam that can be constructed either as in Case I or as in Case II, If the nails are spaced at 9 cm, determine the largest vertical shear that can be supported in each case so that the fasteners will not fail.

Solution:

The enD