How to Check Timber Under both Bending and Axial Load?

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The members which are under the combined effect of axial as well as bending load should satisfy the following equation

P_a/P +M_a /M < 1

where
P_a total axial load on member, lb (N)
P= total allowable axial load, lb (N)
M_a= total bending moment on member, lb in (Nm)
M =total allowable bending moment, lb in (Nm)

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