Error and Comparison of Two Different Basement Models

[BurakKD]

Hello, I would be glad if you could help me with the errors of a sub-basement building model. 1. In the first model, I modeled the sub-basement as a separate floor, but in this case, the reinforcements in the columns in the sub-basement level suddenly increase. The reason for this is that the load effects at the lower end of the column on the ground floor are high and the column in the basement floor exceeds the maximum pursantan. is this true). 1.1. In addition to the first model, too much reinforcement is seen on the curtain, which is defined as the short head region. Are these problems a model error or is it normal for it to appear like this? 2. In the second model, I modeled the basement floor on the ground. Here, there was not much reinforcement in the reinforcement as in the columns in the other model, and the shear reinforcements in the short head area were not too much. However, although it does not appear in the report here, I am getting an error of system carrier curtains --the thickness of the curtains is 1/16-- from the floor height, since the height of the basement floor+ground floor is 4.5m in geometric control. Should I ignore this? 4.Which of the two models gives a more realistic result. 5. How can we analyze a structure with İdecadde basements most accurately? Waiting for your opinions. I wish you good work. NOTE: Two projects are available in the appendix.

 

[BurakKD]

Re: 2 Different Basement Model Errors and Its Comparison Additionally: 2.1. Thank you for your comments.

 

[Levent Özpak]

Re: 2 Different Basement Model Errors And Its Comparison

Hi, I would appreciate it if you could help me with the errors of a subfloor building model 1. In the first model, I modeled the basement as a separate floor, but this In this case, there is a sudden increase in the reinforcements in the columns in the basement floor.This is because the load effects at the lower end of the column on the ground floor exceed the maximum pursantan of the column in the basement floor. (According to some opinions, I was told to ignore such effects in the basement. ---these effects normally occur in the basement. 1.1.In addition to the first model, too much reinforcement appears on the curtain defined as the short head region. Are these problems a model error or is it normal to appear like this?

Hello, First of all The two models you added are different from each other. In the "SonSubasmanAyrı.cde" project, there is a diaphragm (flooring) formation on the basement walls. It is correct to define it as a separate floor and to accept the floor as rigid. It is normal for the analysis results to come out like this. The columns in the basement floor are forced at the lower ends of the ground floor. You can check the link below on the subject.

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2. In the second model, I modeled the basement floor on the ground. There was not as much reinforcement as in the columns and the shear reinforcements in the short head area did not increase much. However, although it does not appear in the report here, since the height of the basement level + the ground floor is 4.5m in the geometric control, I get the error of the system load-bearing curtains --the thickness of the walls is 1/16 from the storey height. I should ignore it.

In the "SonSubasmanZeminde.cde" project, since there is no floor on the basement walls, it can be modeled by adding it to the height of the storey as in the project. If you want to design the reinforcement according to the upper level of the basement curtains in the columns, you can use the basement level separately in the project you added in the link below. you can model it as a floor. In this case, the floor should not be considered rigid.

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- It would be appropriate to consider the warning about curtain thickness.

4.Which of the two models gives a more realistic result. 5. How can we best analyze a building with İdecadde basements.

Both models are different from each other. Depending on the situation in practice, basement curtains can be modeled in all three ways above.

2.1. Thank you for your comments, isn't this a faulty design since the basement walls that I modeled on the ground floor provide short column formation in the columns?,

In order to prevent short column formation, you can use the basement curtains on the condition that they are applied on site. You can model data entry without connecting to columns and carrier curtains.