Problem 1 A WT 7 section of ASTM A992 steel is attached to a wide gusset plate w
ID: 1712667 • Letter: P
Question
Problem 1 A WT 7 section of ASTM A992 steel is attached to a wide gusset plate with fillet welds deposited by shielded metal arc welding (SMAW) using E70XX electrodes. The welds are 18-in in length along each side; no weld is placed across the member end. Assume that the gusset plate has adequate strength and is ASTM A572 Grade 50 steel. Service dead load and live load are indicated in the figure below. Determine the suitable WT section and weld size necessary, and indicate the value of the limiting member design strength, Pn.Explanation / Answer
Service dead load = 100kips
Service liove load = 200 kips
Factored load = (1.2*100)+(1.6*200)=440 kips
minimum area of cross section of WT7 needed = 440/(0.9*50)=9.78 in2
Let us consider WT7x34 which has a gross area of 9.99 in2
Length of weld =18"*2=36"
We know,per AISC ,Weld strength is given by 1.392DL
1.392*D*36 = 440
D=8.78
Theoritically we need ,9/16" fillet weld. Flange thickness of WT7x34=0.72(>9/16)
Therefore,weld can be accomodated
Therefore. use WT7x34 and 9/16 weld
Design strength of weld=1.392*9*36=451 kips
Design strength of WT7x34 = 0.9*50*9.99=449.55 kips
Therefore ,the axial strength of connection in tension is 449.55 kips
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