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What is the value of this couple when (a) P is one-quarter the Euler critical load and (b) P is zero?

220 (C). An initially straight strut of length L has lateral loading w per metre and a longitudinal load P applied with an eccentricity e at both ends.

If the strut has area A, second moment of area I, section modulus Z and the end moments and lateral loading have opposing effects, find an expression for the central bending moment and show that the maximum stress at the centre will be equal to

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