I get cut safety and Beam Nmax error on U curtains

M

M.ORAL

New Member
hello, in my project, I am getting a shear safety error on U curtains in elevators and stairwells. My concrete class is c35. I could not solve the problem even though I increased the reinforcement area. Analysis was done with a semi-rigid diaphragm. The analysis time is about 1 hour. Is it wrong to solve with a fully rigid diaphragm? I would appreciate your help. Good work.
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Re: Shear safety on U curtains and Beam gets Nmax error Hello My suggestions; --Make a group curtain around the elevator/stairs, --Delete the P12 curtain given separately from the building in the 1st and 2nd basement floors, dissolve it as a separate retaining wall, --Remove the floor stiffness ticks in the 1st and 2nd basement floors, (on both sides) There is a curtain.) --Make a cassette for the tiles you have entered as hollow floor slabs.
 
Re: Shear safety on U curtains and Beam gets Nmax error Hello; 1- Define your U curtains in the core region as Group curtains. For details, you can refer to the topic of defining group curtains in the forum. 2- In these and similar cases, some of the arms of the group curtains are given different levels on some floors, and make arrangements by giving the same level to all the curtains in the same group. 3- If possible, choose your curtain thicknesses of 35 or 40 cm 4- Increase your beam widths (min 40cm in my opinion), this will allow you to create a more rigid floor diaphragm and to share the horizontal loads more easily between the elements. 5- Especially select the beams between your core curtains as high as possible. 6 - For preliminary design, you can make a solution by using the Full rigid diaphragm and Static Eccentricity options, my suggestion is to finish your project with Semi-rigid diaphragm and Dynamic eccentricity options in the final calculations. Best regards.
 
Re: Shear safety on U curtains and Beam gets Nmax error
"2m project":25stjrty" said:
Hi; 1- Define your U curtains in the core area as Group curtains. For details, you can refer to the topic of group curtain definition in the forum 2- On some floors, some arms of the group curtains are given different elevations, and in similar cases, make arrangements by giving the same level to all the curtains in the same group 3- If possible, choose your curtain thicknesses of 35 or 40 cm 4- Increase your beam widths (I think min 40cm), this situation will give you more rigidity It will allow you to create a floor diaphragm and to share the horizontal loads more easily between the elements. 5- Select the beams between your core curtains as higher as possible 6 - For preliminary design, you can make a solution by using the Full rigid diaphragm and Static Eccentricity options, my suggestion is Semi-rigid diaphragm and Dynamic in the final calculations Finish your project with eccentricity options Best Regards.
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When we model as a group There was no change regarding the man interrupt security. I don't understand what you mean in the 6th item. I need to analyze with fully rigid first and then analyze with semi-rigid process. Are my choices for the R coefficient correct?
 
Re: Shear safety on U curtains and Beam gets Nmax error Hello; Group curtain modeling is a mandatory requirement as per the regulation, it cannot be expected to eliminate the shear insufficiency alone, so I said change your curtain thickness and beam dimensions. The 6th item was a suggestion to shorten your analysis time, which took 1 hour during the preliminary design process. Otherwise, there is no such thing as first do this and then do this. Your R coefficient selections are suitable for the beginning, follow the program warnings and regulation articles after the analysis. Pay attention to the warnings of Ünver Bey about your hollow blocks, except for your basement floors and balconies. Best regards.
 
Re: Shear safety on U curtains and Beam gets Nmax error
"M.ORAL":refuv1t5" said:
hello, I get shear safety error on U curtains in elevator and stairwells in my project. my concrete class is c35.etriye reinforcement I couldn't solve the problem even though I increased the area. Analysis was performed with semi-rigid diaphragm.
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Hello, Your project has stages and low floors. There are increases in shear forces in the semi-rigid diaphragm solution due to step and low floors. Rigid floor properties/Static tab in elevation floors You can check the diaphragm creation option to solve it, or you can evaluate the solution options with the full rigid diaphragm option from the Analysis settings / General settings. Good work. This is among our notes that occurred in v10.17. This situation will be fixed for semi-rigid diaphragms in future versions.
 
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