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B-36

w. A p. t p. Strength due to cover plate. Capacity of W-shape. M-diag. d. x. x. Length of cover plate. t p. Cover-Plated Beams.

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B-36

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  1. w Ap tp Strength due to cover plate Capacity of W-shape M-diag. d x x Length of cover plate tp Cover-Plated Beams Some material savings can be achieved when adopting a limited capacity beam , strengthened by two cover plates to flanges in zones of higher bending requirements. B-36

  2. Ap tp d x x tp Cover-Plates After plate thickness and width are determined, the plate length is determined from the B.M. diagram. B-37

  3. DL = 1.2 k/ft LL = 2.8 k/ft 20 ft Example on Cover Plates Example B – 12 For the simple beam shown, design the beam utilizing W 18x46 which is available in stack, Fy = 36 ksi Assume full lateral bracing (Lb = 0). Solution Factored load Wu = 1.2 D.L. + 1.6 L.L. = 1.2 x 1.2 + 1.6 x 2.8 = 5.92 k/ft. B-38

  4. Design of Cover Plates: = 90.7 + 23 = 113.7 in3 > 109.6 in3 O.K. Shear strength of w 18  46 v Vn = 176kips v Vn > Vu = 59.2k OK Length of Cover Plates: Moment capacity of beam = b Mp = 0.9  90.7  36/12 = 245 k·ft. B-39

  5. need plate 296 245 x x 5.92 k/ft 20' Length of Cover Plates: The beam moment capacity is good up to (x) location. The middle region requires coved-plates. B-40

  6. Development , length. Need extra length to develop the strength of the plate, This extra length at each end is called “development length”. This should be added to the theatrical length to get the actual length..  Minimum extra length at each end = 2  width of plate In this example, need total length (twice width) Length of Cover Plates: Use 9'- 4" length plate 5'- 4" 9'- 4" 5'- 4" W18  46 20' B-41

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