Problem 5.5-23A small dam of height h 5 6 ft is constructed ofvertical wood beams AB, as shown in the figure. The wood beams,which have thickness t 5 2.5 in., are simply supported by horizontalsteel beams at Aand B. Construct a graph showing the maximum bending stress smaxinthe wood beams versus the depth dof the water above the lowersupport at B. Plot the stress smax(psi) as the ordinate and the depth d(ft) as the abscissa. (Note:The weight density ±of water equals 62.4 lb/ft3.) Solution 5.5-23Vertical wood beam in a damSECTION 5.5Normal Stresses in Beams303Wood beamWood beamSteel beamSteel beamSide viewTop viewBAhdtth56 ftt52.5 in.±562.4 lb/ft3Let b5width of beam(perpendicular to thefigure)Let q05intensity ofload at depth dq05±bdANALYSIS OF BEAML5h56 ftx05dBd3LRB5q0d6¢32dL≤RA5q0d26LMAXIMUM BENDING STRESSSection modulus:
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