5.3: Determinacy and Stability of Trusses


The conditions of determinacy, indeterminacy, and instability of trusses can be stated as follows: $\begin{array}{l} m+r<2 j \quad \text { structure is statically unstable } \\ m+r=2 j \quad \text { structure is determinate } \\ m+r>2 j \quad \text { structure is indeterminate } \end{array}$

where

$$m =$$ number of members.

$$r =$$ number of support reactions.

$$j =$$ number of joints.

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