Computer analysis. The columns and girder of the indeterminate rigid frame in Figure P5.57a are fabricated from a W18 × 130 wide flange steel section: A = 38.2 in.² and I = 2460 in.⁴. The frame is to be designed for a uniform load of 4 kips/ft and a lateral wind load of 6 kips; use E = 29,000 kips/in.² . The weight of the girder is included in the 4 kips/ft uniform load. (a) Compute the reactions, plot the deflected shape, and draw the shear and moment curves for the columns and girder, using the computer program. (b) To avoid ponding* of rainwater on the roof, the girder is to be fabricated with a camber equal to the deflection at midspan of the roof girder produced by the uniform load. Determine the camber Figure P5.57.

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6 kips Of 4 kips/ft 2 40' camber = ? T unloaded frame (b) 3 3 15'