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Rotules plastiques et moment résistants


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Si j'ai bien compris, dans une étude sismique, on doit éviter la formation de rotules plastiques dans les poteaux et c'est pourquoi il faut respecter la formule :

|Mn|+|Ms| > 1.25( |Mw|+|Me| ) (cf. Article 11.813 du ps92)

Ma question est : est il possible de calculer ces moments à la main ?

Si oui, quelles sont les formules ?

Merci d'avance.

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