Repeat Problem 1 using the LRFD method with ASCE 7 load combinations.Problem 1In addition...

Repeat Problem 1 using the LRFD method with ASCE 7 load combinations.

Problem 1

In addition to the dead loads described in Problem 2, Columns A and B in Figure also can carry vertical live loads of up to 800 and 1200 k, respectively. The live loads vary with time, and thus may be present some days and absent other days. In addition, the live load on each column is independent of that on the other column (i.e., one could be carrying the full live load while the other has zero live load). Using the ASD method for ultimate limit state design and the dimensions obtained in Problem 2, and the worst possible combination of live loads, determine if the bearing pressure distribution always meets the eccentricity requirements described in this chapter. The groundwater table is at a depth of 10 m.

Problem 2

The two columns in Figure are to be supported on a combined footing. The vertical dead loads on Columns A and B are 500 and 1400 kN, respectively. Using the ASD method for ultimate limit state design, determine the required dimension B2 so the resultant of the column loads acts through the centroid of the footing and express your answer as a multiple of 100 mm.

Figure Proposed combined footing for.