RAFT BASE-AS1-AS2 PROBLEM

[k0ry]

Good morning, I'm designing the foundation for the cement silo. There are a few things that I have in mind about the reinforcement area. I wanted to consult them with you. I defined my raft foundation and columns on it, I applied the base reactions from Sap 2000 to my columns as a nodal load, and I had the program do the fundamental analysis. Then I examined the As1 and As2 values. I saw that the As1 and As2 values were 0 in most fields. My question is that the As values here are Reinforced Concrete-Rat Flooring Tab Independent of the reinforcement area we have defined, our Rebar-Current reinforcement tab of the reinforcement area according to the reinforcement we have determined. It shows whether it is sufficient. In other words, can I calculate the reinforcement from the Reinforcement-Existing reinforcement tab and put the reinforcement I calculated here on the raft, or should I put this reinforcement in addition to the [/color] reinforcement in the Reinforced Concrete-Rat Flooring Tab?

 

[Levent Özpak]

In the program, the main reinforcements in beamless raft are designed according to the design moments where the calculation axis passes. If there is a larger moment in a different coordinate, additional reinforcement is thrown to meet this moment. This information is given in the Raft Flooring Reinforced Concrete dialog. It is sufficient to use the reinforcements given in this dialog in the foundation design. (If there is no reinforcement deficiency problem in the reinforced concrete dialog). When the charge combination changes, the As values also change. The As values in the 3d window are for inspection purposes only. It is independent of the reinforced concrete dialogue.

 

[k0ry]

Thank you, Levent. or do I have to calculate and add manually. Thanks in advance.

 

[Levent Özpak]

The program automatically assigns additional equipment to where it is needed. In the reinforced concrete dialog, if the reinforcements where your calculation axes pass are designed according to 40 tm, there is no need for additional reinforcement. If you think there is a problem, you can add your project.

 

[k0ry]

I have 235 tons of uploads. In the columns on the edges of the raft. 70 tons in the middle. The negative moment in the middle seems very high.

 

[Levent Özpak]

I have a load of 235 tons. In the columns on the sides of the raft. 70 tons in the middle. The negative moment in the middle seems very high. I have attached the file and I would appreciate it if you share your opinion. In the dialog, moments are seen where the calculation axis passes. For example, in the calculation axis No. 1, the opening is 48.931 tfm at the bottom. Ashesap is 11.781 cm 2. The reinforcement thrown due to the minimum pursantage is 22.7 cm². The 22.7 cm² reinforcement meets the 62.5 tm moment. Therefore, there is no need for additional reinforcement. Note: The working distances of the raft reinforcement axles in the x direction are not arranged properly.This leads to inaccurate measurements.The working distances of the reinforcement axles can be adjusted with the change the geometry of the reinforcement calculation axle command. Good work

 

[k0ry]

I have 235 tons of loads. In the columns on the edges of the raft. 70 tons in the middle. The negative moment seems too high. I'd be glad.

There doesn't seem to be a problem. In the reinforced concrete dialog, moments appear where the axis of calculation passes. For example, in account axis 1, the opening moment is 48.931 tfm. Ashesap 11,781 cm2. The equipment discarded due to the minimum purchase price is 22.7 cm2. The 22.7 cm2 reinforcement meets the 62.5 tm moment. Therefore, there is no need for additional equipment. Note: The working distances of the raft reinforcement parts in the x direction are not arranged properly. This causes the metering to be inaccurate. The working distances of the reinforcement axles can be adjusted with the Change the geometry of the reinforcement axis command. Good work

Thank you for your work, good work.