Excess Vertical Reinforcement in Ground Floor Columns

G

ganymede

New Member
Hello to everyone. In most of the projects where the basement floor is completely sheathed, I observe that there is an excessive increase in reinforcement in some ground floor column reinforcements, and they return normally from the 1st normal floor. What could be the reason why there is more reinforcement on the upper floor compared to a lower floor and the difference is so much? Is it normal that the reinforcement ratio between two adjacent floors is half-half? (Note: I have equalized the column reinforcements in question to the foundation. If you are going to analyze, please remove the lock) Regards.
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Hello, I haven't seen your project, but 2 possible reasons; 1- If your load-bearing system does not have core shears or exterior shears, it is normal for large moments to occur in the ground floor columns just above the rigid basement floor. If there is such a situation, then the longitudinal reinforcement will be excessive. Examine the cross-section effects. 2- In some narrow-plan structures or in the columns just below a large core wall, tensile forces occur under the effect of earthquakes. In such a case, the longitudinal reinforcement is increased to meet the tensile force. Again, examine the cross-section effects.
 
"MaFiAMaX":3il7ypk2" said:
Hi, I haven't seen your project, but there are 2 possible reasons; 1- If your structural system does not have core shears or facade shears, it is normal to have large moments in the ground floor columns just above the rigid basement floor. The reinforcement becomes excessive. Examine the section effects. 2- In some narrow-plan structures or in the columns just below a large core wall, tensile force occurs under the effect of earthquake. In such a case, the longitudinal reinforcement is increased to meet the tensile force. Again, examine the section effects.
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Thank you for your reply. There is a curtain for the elevator in the core but not on the outer edges. I have attached the project, it is not narrow-planned.
 
Hello. Remove the DS ticks on the column reinforcements and do a solution. In the project, there is reinforcement in columns S5 and S6 that does not exceed the percentage limit of Pursantage. This is due to the fact that the distance between the two columns is short and it takes more moments. In the corner columns, the cellar is normal. You can reduce the floor loads in the attic and remove the wall loads. Solve the ladder together. Unver ÖZCAN
 
"unver":3p3ipvze" said:
Hello, solve the DS ticks in the column reinforcements. In the project, there is reinforcement that has not exceeded the Pursantage percentage limit in the S5 and S6 columns. This is due to the fact that the gap between the two columns is short, so it takes more moment. The cellar is normal in the corner columns. The floor in the attic floor You can reduce the loads and remove the wall loads. Solve the ladder together. Ünver ÖZCAN
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Ünver Bey, I have equalized the tics of the column reinforcements so that they continue up to the foundation. In my analysis, the maximum pursantage is not exceeded. I found that the vertical reinforcements on one bottom and one top of the columns in almost half of the ground floor I couldn't understand why it was more than one floor relative to one floor. If this is normal, why half as much on a downstairs and an upstairs floor. In other words, half the moment between two adjacent floors made me think that there might be an error in my model or calculations. By the way, my version 7. Thanks for your attention and response Thank you Sent via iPhone using Tapatalk
 
"ganymede":2mobongj" said:
I observe that in most of the projects where the basement floor is completely sheathed, there is an excessive increase in reinforcement in some ground floor column reinforcements, while it rotates normally from the 1st normal floor. What could be the reason for it being so much? Is it normal for the reinforcement ratio between two adjacent floors to be half-half?
Click to expand...
"ganymede":2mobongj" said:
Unver Bey, I equalized the tic column reinforcements so that they continue all the way to the foundation. In my analysis, the maximum purchase price is not exceeded. I couldn't understand why the vertical reinforcements in the columns in almost half of the ground floor are too much compared to the one below and one above. If this is normal, why half as much on one downstairs and one upstairs. In other words, half the moment between two adjacent floors suggested that there might be an error in my model or calculations. By the way, my version is 7.
Click to expand...
Columns are designed according to the effects of the combination that will produce the largest reinforcement area as elements under the effect of axial load and compound bending. It would not be the right approach to make comparisons based on the moment alone. If you examine the design effects based on the column reinforced concrete, you can see that the loading combination changes with these effects between floors. This change depends on the carrier system and the effects calculated as a result of the analysis. Due to the contribution of the curtains in the basement floor, which are not on the upper floors in your project (which the curtains share the effects), such a change seems normal, especially in the columns connected to these curtains.
 
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