A built up column section is composed of 2 C 310 x 45 and 2 plates b x 12 mm as shown in Figure ST – 169. The column has a height of 8 m and both ends are hinges. Use Fy = 290 MPa. 1. Find the value of b so that the section is equally strong in both axes? 2. Compute the value of the allowable compressive load for ASD. 3. Compute the value of the design strength for LRFD.
A built up column section is composed of 2 C 310 x 45 and 2 plates b x 12 mm as shown in Figure ST – 169. The column has a height of 8 m and both ends are hinges. Use Fy = 290 MPa. 1. Find the value of b so that the section is equally strong in both axes? 2. Compute the value of the allowable compressive load for ASD. 3. Compute the value of the design strength for LRFD.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A built up column section is composed of 2 C 310 x 45 and
2 plates b x 12 mm as shown in Figure ST – 169. The column has a height of
8 m and both ends are hinges. Use Fy = 290 MPa.
1. Find the value of b so that the section is equally strong in both axes?
2. Compute the value of the allowable compressive load for ASD.
3. Compute the value of the design strength for LRFD.
Transcribed Image Text:ib
bx 12 mm!thick plate
С 310 х 45
Figure ST - 169
Properties of C 310 x 45
A = 5690 mm?
d = 310 mm
bf = 80 mm
tf = 12.7 mm
x = 17 mm
Ix = 67.30 x 106 mm4
ly = 2.12 x 106 mm
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