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06/11/2023 10:38 am
In NZSEE 2020 conference, Paper 153, it outlines the research work to compare five different floor diaphragm analysis options, including strut & tie, cohesion friction, …etc. The Strut & Tie option gives the floor diaphragm the lowest load capability.
In MBIE assessment guideline C5 for Concrete Building, C5.5.4.2 says “Design actions on concrete diaphragms should be determined using a strut and tie analysis”
It says “should be” instead of “shall be”. Does it means, if we prefer, we are able to use elastic finite element analysis using membrane elements (cohesion friction approach) to analysis the floor diaphragm instead of using strut & tie.
I would like to see what others think? Any comments?
13/03/2024 5:48 pm
Hey Victor, hope you’re well.
My thoughts are nothing is stopping you from using any method you deem appropriate. I’m unfamiliar with the Cohesion friction approach but, the difficulty will be interpreting the results and given the specialist nature, warrants peer review.
The benefit of using a grillage model is that it is easy to interpret the results and is widely adopted. There is guidance in the assessment guidelines which if followed, protect you. So if swaying away from it, then there would need to be robust rationale for doing so.
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