Question

Using allowable stress design determine the allowable centric load for a column of 10-m effective length that is made from the following rolled-steel shape: W250x101 Use - 250 MP and E-200 PA-12,900x10*m? ry65.8x10 m

Answer 1

Given Data Effective length Chel by = 250 mpa. E = 200 GPO A= 12,900 x 106 m2 Gry = 65.9x103 Properties of Rolled steel shape W 250 x 101 Xxx : 16M X m m ". I = 55.5 x cº mº Concept : column buckle in that plane about which I (me I) is minimum We know oradias of sgration. Sy = T so Iyy = (ny) ² x A = (65.88 10 3 2 x 12900 x 10-6 4 Iyy =55852356 X 10 T min. - Igy By comparing given properties get to is I min. Know ܟܢܫ We know critical load for a column is given by Por T² T2 EI (e) ? or 6 Par T? EI Che/²A

Por = (2 x 200 x 109 x 5.5852356 X107 (10)2 x 12900 x 10-6 Por = 85463668 N og Por=85463-668KN Ans