Column Beam Joint Zone Warning

D

deformation

New Member
Hello, there are 2 3-storey project solutions attached. Same build on both sides. I am getting too many joint zone errors in the solution of a 3-storey building with C25 class concrete. Then I solved the junction zone errors by adding curtains to the system, but for some reason it seemed very unreasonable to me to get so many junction area errors in a 3-floor building. I would appreciate if you could comment on how logical it is to add curtains to the system in order to eliminate these errors. I had to add curtains since I can't change the column directions and dimensions.
 
Hello, Column - beam shear safety control is applied for "columns with high ductility level" in line with the principles specified in TBDY 2018 7.5. In this context, it is normal to provide column beam shear safety in the project where you add curtains, because you made curtains for columns that are not provided. Column beam shear safety control is not directly related to the number of floors. It is related to the area where the beam is held by the column (bj*h), whether the joint is enclosed or unconfined, and the sum of the beam's left-right support, bottom and top reinforcement areas (As1, As2). Ve = 1.25fyk(As1+As2) -Vcol <= 1.7 bj root(fck) (In flanked joins) Ve = 1.25fyk(As1+As2) -Vcol <= 1.0 bj root(fck) (Uncontained joins). In your project with a union error, all your columns are uncontained joins and the upper limit is 70% less in uncontained joins than in confined joins. For more detailed information, you can review TBDY 2018 7.5.
 
Thank you for your answers, while we normally solve with 7, when we add curtains to the system, there was a huge decrease in the periods. In fact, there was an incredible period difference between ide 7 and ide 8 when we used it according to the 2007 earthquake regulations for the same structures. there were also incredible colon pursantage differences between ide 7 and 8. what can I say, when I was very stuck, I used to solve the system with ide 7 :) If I think that adding curtains to the system does not have as much effect on increasing the rigidity of the structure as it used to be, this is what I understand from the results. This forces us to make solutions with columns with larger cross-sections. In projects with difficult column placement, there is no direction of movement. We'll get used to it in time. safety first!
 
It is normal for the period to decrease when you add curtains to the structure. Because you increase system rigidity. If you add the two projects without curtains with curtains, which you conclude that there is a "very big drop" in periods when you add curtains at 7, we can look at it. It is not a situation that we know and observe that there is an "incredible period" difference for the structure where all data entries are the same between 7 and 8. Solve the same structure in 7 and 8 and you'll see similar results. If you add the two projects that you don't see the "amazing period" difference, we can take a look. As a data entry, you must confirm that the two projects are the same. 8, there may be a difference in the reinforcement area consisting of tensile axial force, if any, in the column reinforced concrete design. This is a possibility we added in 8. However, the reinforcement area, which can be formed by column tension and axial force, does not cause "incredible column price difference". If you add the project that you observed to be out, we can take a look. According to TBDY 2018, the periods are different from the periods observed according to TBDY 2007, due to the use of element-effective stiffnesses in the solution. Your last message has nothing to do with your first column beam shear safety question. I have stated in my previous message on which aspects the column beam shear safety control depends.
 
In version 7, user defined wall loads are unchecked in analysis settings. Wall loads are not taken into account in beams. If you tick this option, you can observe that 8.62 period values are close to 7. I'm guessing you migrated your project from 8.62 to version 7. The program warns the user when saving to version 7 older than 8.62 or opening version 7 to 8.62. Therefore, when making a comparison between 8.62 and 7, it must be confirmed that the load, geometry and analysis settings match exactly.
 
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