The value of the redundant force, in the unit load method of analysis of indeterminate truss, (where the symbols has their usual meaning) is
1
\( - \frac{{{\rm{\Sigma }}\left( {\frac{{PAE}}{{KL}}} \right)}}{{{\rm{\Sigma }}\left( {\frac{{KAE}}{L}} \right)}}\;\)
2
\( - \frac{{{\rm{\Sigma }}\left( {\frac{{P{K^2}E}}{{AL}}} \right)}}{{{\rm{\Sigma }}\left( {\frac{{KE}}{{AL}}} \right)}}\)
3
\(- \frac{{{\rm{\Sigma }}\left( {\frac{{P{K^2}L}}{{AE}}} \right)}}{{{\rm{\Sigma }}\left( {\frac{{KL}}{{AE}}} \right)}}\)
4
\(- \frac{{{\rm{\Sigma }}\left( {\frac{{PKL}}{{AE}}} \right)}}{{{\rm{\Sigma }}\left( {\frac{{{K^2}L}}{{AE}}} \right)}}\)