For formation of collapse mechanism in the following figure, the minimum value of $P_{u}$ is $\mathrm{cM}_{p} / \mathrm{L}$. $M_{p}$ and $3 M_{p}$ denote the plastic moment capacities of beam sections as shown in this figure. The value of $c$ is

For formation of collapse mechanism in the following figure, the minimum value of $P_{u}$ is $\mathrm{cM}_{p} / \mathrm{L}$. $M_{p}$ and $3 M_{p}$ denote the plastic moment capacities of beam sections as shown in this figure. The value of $c$ is

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