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1. [15 points] Find the governing load (in pounds or kips) for the 1st-floor wood column shown below. Remember to consider the influence of duration of load. Do not consider live load reduction. The loads are: D = 25 psf; L = 50 psf; S = 45 psf; and Lr = 30 psf.  2. [15 points] What is the capacity of a Hem-Fir No.2 4x4 column used indoors, assuming a stability adjustment factor, Cp = 0.75. and governing loads consisting of live and dead only? Do not compute or check Cp; just use the value given. Be sure to include all other applicable adjustments. 3. [15 points] Design a (select the lightest) W-shape steel column (A-992 steel) to support a load of 75 kips. The column has an effective length of 15 feet. | |
| 4. [15 points] What is the capacity in tension of a 2x10 Douglas Fir-Larch No.1 connected with 1 line of three 5/8" bolts as shown at right. Loads are live and dead only, and the structure is entirely indoors. Be sure to include all appropriate adjustments. |  |
5. [20 points] (a) Find the required steel area and (b) select 4 bars for a 10"x16" tied reinforced concrete column supporting a design load, Pu = 600 k. Check (c) if reinforcement ratio is between 1% and 8%; and (d) if the selected bars fit in the column. Do not redesign if no good. Use f'c = 5 ksi. | |
| 6. [20 points] (a) Find the required steel area and (b) select 4 bars for the 16"x14" reinforced concrete beam-column shown at right supporting a design load, Pu = 784 k and a design moment, Mu = 119.5 ft-k. Check (c) if reinforcement ratio is between 1% and 8%; and (d) if the selected bars fit in the column. Do not redesign if no good. Use f'c = 4 ksi. Choose the interaction curve with the value of γ closest to 11/16 = 0.6875. |  |
© 2007 J. Ochshorn. All rights reserved. | |