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06/05/2026 6:05 pm
in 5.5.5.2.1. the Mprob is corresponding to the moment when the extreme concrete fibre reaches strain = 0.003. Also, as per section C5.5.3.4.1 the bilinear approximation rules and C5.5.5.3.4.3, the curvature cap rules. the moment at curvature cap can be 20% approx less than the moment at 0.003 due to losing the lever arm of steel and concrete as the result of the spalling concrete cover. I am just wondering how this 20% moment difference is considered in the C5 framework. Thank you
06/05/2026 7:56 pm
Are you referring to the drop of the “actual relationship” line compared to the “assumed relationship” in Figure 5.16 of C5-2025?
That decrease is generally not considered in assessments, though might be in some instances where non-linear analysis is used.
06/05/2026 8:35 pm
@brooke yes Nick, figure 5.16. which means there will be a chance to lead to 20% + or – in %NBS?. while you are here Nick I might ask one more thing regarding C2 table.C2A.1. is the column sway Vb formula correct? is it suppose to be Hi ( story Hight of the soft story) instead of Heff? Thank you
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