Continuous basic parameters and reinforcement selection

[emrahkoyuncu]

I am working on a housing project with a 5-storey ground floor car park. I wanted to share a few points that stuck in my mind. I would appreciate if you help me. I have always designed my system as a basis. My basic dimensions are 70 * 100. When I analyzed, the flat reinforcements were 13fi14. In this way, my distance between the reinforcements was approximately 2.5 cm. It is obvious that it will be difficult for concrete to enter through them in this way. Therefore, it did not feel very hot. In continuous basic parameters, my minimum tensile market value is 0.003, for the total min as value, the value is 0.002 from 0.8fctd/fyd. After I set this value to 0.002, my flat reinforcements decreased to 11fi14. My question is, will there be any problem if I change this value in the program? If there is no problem in changing it, is this value appropriate? This is my first question. -Also, although I select the stirrup tightening option in the parameters in the support areas in the continuous foundation drawing, the supports do not tighten. Except for my short beams, this also applies to beams with sufficient span. I cannot see this when I draw. When I reduce it to 70 cm, both the stirrup tightens as I want and my quantity decreases significantly. Now then you can say that you can take the foundation height as 70 cm and continue, but I am comparing for these two cases, for example, in my foundation area of 155 meters, my foundation height is 1 meter, while my base height is approximately 45 kg per meter. While the reinforcement is going. When I reduce the height to 70, it drops to 32kg. Is this difference due to my body reinforcements. Or is it normal? I wonder what kind of way I should follow in choosing the reinforcement. Other than that, I chose to take my foundation height of 1 meter in proportion to my floor height in such buildings, and also with the thought of preventing cracks that will occur in the foundation. How do you evaluate it to be this way. By the way, I am a beginner as a static experience. I want to benefit from your knowledge and research and have the ability to make more accurate decisions. .thank you, have a nice day. I wish you a good work..

 

[emrahkoyuncu]

Is there anyone to answer?

 

[NYILMAZ]

It is very difficult to comment without a project. But I can briefly say a word or two. The extent to which the pursantage value will be reduced is of course specified in the regulations. It is not right to fall below the regulation values. Please refer to the regulations. Furthermore, there are cases where reinforcement drop is normal when you reduce the beam size from 100 to 70. If a beam of 70 cm or maybe 60 cm high is enough for your system, if you make it 100 cm, you will go to an unnecessary size increase. In such a case, the elements work well below their capacity. However, as I wrote above, you have to discard a certain reinforcement depending on its dimensions (cross-sectional areas) as required by the regulations. Tensile and compression zone reinforcements will increase parallel to the cross-sectional area. This will also increase the amount of equipment you have. Another situation is simply that even if the stirrup spacing remains the same, the lengths of the stirrups (even if they are double stirrups / single stirrups) and the number of stirrups will also increase. This causes the rigging of the meter. It is not very correct to say something about the foundation that there will be such a height on that floor. Soil parameters are effective here, as well as the distances between the two columns are important due to the load they collect. Similarly, the shear forces it meets. But based on experience, I can say that 100 cm foundation beam height is too much for a 5-storey building. (although my sentence remains in the air)

 

[emrahkoyuncu]

Mr. Yilmaz, this is my project. Can you review it. Thank you.

 

[Levent Özpak]

I am working on a housing project with a 5-storey ground floor car park. I wanted to share a few points that came to my mind, I would appreciate if you could help me. I have always designed my system as a foundation. My basic dimensions are 70*100. When I analyzed the flat reinforcements were 13fi14. In this way, the distance between the reinforcements decreases to approximately 2.5 cm. It is obvious that the concrete will hardly enter through them in this way. Therefore, it did not feel very hot. In the continuous foundation parameters, my minimum tensile strength value is 0.003, for the total as value, the value is 0.002 from 0.8fctd/fyd. It turns out. After I set this value to 0.002, my flat reinforcements went down to 11fi14. My question is, will there be any problem if I change this value in the program? This is my first question, if there is no problem in changing this value. This is my first question.

The minimum pull price in the program is determined by two criteria. The min. Pull Pursant Value entered in the Parameters dialog, the second being 0.8fctd/F, which is automatically controlled yd value... Under no circumstances should the reinforcement be less than the limit determined by these two criteria. hence min. Even if the withdrawal price value is 0.0001, the value calculated from 0.8fctd/fyd will be used. It's okay if you reduce the value. Also, when a new project is opened using the Template, the Min. The Pull Pursantage value is 0.001.

-Although I have selected the stirrup tightening option in the parameters in the support areas in the continuous foundation drawing, the supports do not tighten. This also applies to the beams with sufficient span, except for my short beams. I can't see it when I draw

- It is seen that stirrups are tightened in continuous foundation drawings. In fact, since the wrapping area must be at least 2*h from both supports, all of the foundation beams that do not have enough distance for the middle region are tightened.

I am encountering a large amount of reinforcement compared to my square meter. When I reduce my foundation height to 70 cm, both the stirrup tightens as I want and my quantity drops significantly. Now then you can say that you can take the foundation height as 70 cm and continue, but I am comparing for these two cases, for example, in my foundation height of 155 meters, my foundation height is 1 meter and it is approximately 1 meter. While 45 kg reinforcement is going, when I decrease the height to 70, it drops to 32 kg. Is this difference due to my body reinforcements? or is it normal.

It is normal for the quantity to decrease when the Foundation Height is reduced in your project. The need for reinforcement is reduced in cross-sections that work at minimum. The body reinforcement is decreasing. Since the foundation height has decreased, the middle zone is formed in all of the foundations with stirrup compaction and the stirrup spacing is 20 cm in the middle zone. happening etc...