Task Objective Given a circular concrete filled steel tube with outside diameter of 30", 3!" wall thickness, and steel ield stren#th of $0 ksi, use the %&S' plastic stress distribution method to develop a bendin# moment( a)ial compression interaction interaction curve* 'oncrete fill has a compressive compressive stren#th of $ ksi* Specifications Refernced 1. AISC Section I 1.2. Design Methodology
For the plastic stress distribution method the nominal strength shall be computed assuming that steel components have reached a stress of F$ in either tension or compression and concrete components in compression have reached a stress of )./" fc. For round 0SS lled with concrete a stress of ).2" fc is permitted permitted to be used for concrete components in uniform compression to account for the effects of concrete connement. 2. Design
Figure 1 shows a plan section of the column divided divided into different sections. Section A represents the area of steel in compression. Section B represents the area of concrete in compression. Section D represents the area of Steel in Tension. Tension. Section C will be used when calculating the the area of concrete in tension. Below we derive the formulas for the aial and fleural loads on the column for various neatral ais.
7sing similar principles as above we can derive the following e9uation for the fleural stress%
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0.95 "
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1$% &"
7sing the information given in the problem we can create a table and plot it% + ").) 4si f- c ".) 4si t ).#/ in . #).)) in r i 15.*'" in r o 1".))) in r m 15./1'" in 8c ).-" 8b ).2)
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