Computer analysis. The columns and girder of the indeterminate rigid frame in Figure P5.57...

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.

Figure P5.57:

*Ponding refers to the pool of water that can collect on a roof when the roof drains are not adequate to carry away rain water or become clogged. This condition has resulted in the collapse of flat roofs. To avoid ponding, beams may be cambered upward so rain water cannot accumulate at the center regions of the roof. See Figure P5.57b.