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Planar Truss
  Summary of stability and determinacy of planar truss:

Planar Truss

Summary of stability and determinacy of planar truss:

Truss m, n, R m>=2n-R Remarks
image 5,4,3 5=2(4)-3  stable
determinate
image 11,7,3 11=2(7)-3  stable
determinate
image 13,8,3 13=2(8)-3   improper truss member
unstable - internal
image 10,7,4 10=2(7)-4   improper truss member
improper constraint
unstable - internal
image 4,4,3 4<2(4)-3   improper truss member
unstable - internal
image 11,7,2 11<2(7)-2 improper constraint
unstable - external
image 10,7,3 10<2(7)-3   improper truss member
unstable - internal
image 6,4,3 6>2(4)-3   improper truss member
indeterminate - overrigid
image 11,7,4 11>2(7)-4   improper constraint
unstable - external
image 11,7,4 11>2(7)-4   improper constraint
stable
indeterminate -overconstrain
image 12,7,3 12>2(7)-3   improper truss member
stable
indeterminate - overrigid

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ID: 120300006 Last Updated: 3/7/2012 Revision: 0 Ref:

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References

  1. I.C. Jong; B.G. rogers, 1991, Engineering Mechanics: Statics and Dynamics
  2. F.P. Beer; E.R. Johnston,Jr.; E.R. Eisenberg, 2004, Vector Mechanics for Engineers: Statics
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