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Truss Design - Moment Check for Metal Connector Plates

Truss Design - Moment Check for Metal Connector Plates

Truss Design - Moment Check for Metal Connector Plates

(OP)
I'm now attacking the plate design for each joint in my truss designer. Specifically for a common fink truss. After reviewing chapter 8 of the TPI standard and looking at all the requirements I'm again at a standstill as I try to understand how to correctly apply the moment check equation at the peak joint of this truss type. The equation is ridiculously complex or at least appears that way at first glance. I am looking for a sample problem that show the application of this equation to either a chord splice or peak joint.

Ma = Cm{T1(Wp+y+z-d1) T2(4Wp+2y+4z-3d1)/3 Cs(d1-z-y) Cw(d1-y)}/5

In particular I'm a little confused how to assign the correct values to determine "y" the distance from the neutral axis to the wood edge with this peak joint configuration. "y" being given by:

y = {t1R1[Fy(1.8z+Wp) Fu(Wp+z)] - 2Pt}/ {d2C+t1R1(1.8Fy+Fu)}

If I measure z from the wrong direction this entire expression will be incorrect.

RE: Truss Design - Moment Check for Metal Connector Plates

(OP)
Thank-you for the link to the paper, this helps clarify where this equation is coming from and maybe I have a better chance of applying it more correctly.

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