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Question about Truss Analysis (Statics)
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[QUOTE="ktw, post: 6256658, member: 666556"] [B]Homework Statement:[/B] Whoops.. accidentally wrote everything in the solution box! Please see below. [B]Relevant Equations:[/B] Fx=0, Fy=0 Hi, I am a civil engineering student currently taking Statics. We are doing truss analysis in the class right now; and I know that this joint is marked as correct. [ATTACH type="full" width="429px" alt="20191101_202114.jpg"]252180[/ATTACH][ATTACH type="full" width="490px" alt="1572658249753.png"]252184[/ATTACH] However, I don't see how this is even possible. I begin by considering this a concurrent 2D force system, Fy = 0 & Fx = 0. The equilibrium equation for Fy is -P + (1/√5)√5 * P + (1/√5)T = 0 ; where sin(θ) = (1/√5) and T is the diagonal that is following the line 8->5. I do not understand how the value of T can equal zero and then the member connecting joint 8 to joint 9 can also be zero; considering this would imply that (2/√5)√5P + 0 = 0 using the equilibrium equation Fx = 0. I understand zero force members and I do not think member 8->9 can be visually determined to be zero. Could anyone shed some light on this for me? Thanks, Kyle [/QUOTE]
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