Unformatted text preview: Q cr ? What is the corresponding value of the distance a ? a 12 in. E 30 * 10 6 psi B A a C E D Q 0.625 in. 0.625 in. 40 in. 10 in. 35 in. 45 in. Problem 11.4-8 The roof beams of a warehouse are supported by pipe columns (see figure on the next page) having outer diameter and inner diameter . The columns have length , modulus , and fixed supports at the base. Calculate the critical load P cr of one of the columns using the following assumptions: (1) the upper end is pinned and the beam prevents horizontal displacement; (2) the upper end is fixed against rotation and the beam prevents horizontal displacement; (3) the upper end is pinned but the beam is free to move horizontally; and (4) the upper end is fixed against rotation but the beam is free to move horizontally. E 210 GPa L 4.0 m d 1 90 mm d 2 100 mm d 2 Pipe column Roof beam L 11Ch11.qxd 9/27/08 3:39 PM Page 867...
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- Fall '11
- Column, steel bars, column BD, Pcr– BD