Division of Raft Foundation by Continuous Foundation

[ceyhunyuksel]

Take it easy everyone. What are your thoughts on defining and dividing the foundation to the protrusion part in the raft foundation applications with T, L or different shapes with protrusions. I drew a situation that I encountered during the project control as an example. They said that 10-15 cm of the raft was relieved in this way. How the program perceives this situation. When they tried to examine it a little, they said that there was no problem in the environmental and urban planning controls, which were also applied in the past (I'm new by the way). Even though the building inspection control elements were in the project in this way, they said that they only tightened the raft flat in that area. I would be very happy if you give information about this application.

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[NYILMAZ]

First of all, this type of data entry (thinking it is an example) is incorrect. In the rafter raft, all floors must be surrounded by beams. You cannot make beams under some columns and make raft foundations around them. Other than that, we can say the following about the subject; Whether it is a continuous foundation or a raft foundation, designing it as a cantilever will of course reduce the stresses under the column. If a continuous beam application is to be made between two columns, the best thing is to make a 3-span continuous beam, not a single span. Right and left console opening and a center opening. The same is true for the raft. If the site limits allow, moving the appropriate amount of raft foundations out of the columns will disperse the stresses under the column.

 

[ceyhunyuksel]

First of all, this type of data entry (thinking it is an example) is incorrect. All floors must be surrounded by beams in a rafter raft. You cannot make beams under some columns and make a raft foundation around them. Other than that, we can say that; Designing with cantilever whether it is a continuous foundation or a raft foundation, of course, reduces the stresses under the column. If a continuous beam is to be applied between two columns, the best thing is to make a 3-span continuous beam, not a single span. Right and left cantilever opening and a middle span. If the plot limits allow, moving the appropriate amount of raft foundations out of the columns will distribute the stresses under the column.

In the example, it is seen that the raft is 50 cm, actually I wanted to sample it as 45 cm, I missed it. So the raft is a whole 45 cm high and 45 cm high inside it. A continuous foundation is drawn with a width of 60 cm. A single continuous contact on the protrusion part hand made. The program separates the raft from each other, so the effect of the columns on the ST is only visible on the ST. It does not separate, a single raft is defined and the other columns except ST appear on the raft in the report. As a result, is it wrong or correct to evaluate the data entry program in this way? can it be done like this?

 

[Levent Özpak]

First of all, this type of data entry (thinking it is an example) is incorrect. In the rafter raft, all floors must be surrounded by beams. You cannot make beams under some columns and make raft foundations around them. Other than that, we can say the following about the subject; Whether it is a continuous foundation or a raft foundation, designing it as a cantilever will of course reduce the stresses under the column. If a continuous beam application is to be made between two columns, the best thing is to make a 3-span continuous beam, not a single span. Right and left console opening and a center opening. The same is true for the raft. If the land limits allow, moving the raft foundations out of the columns in an appropriate amount will distribute the stresses under the column. the foundation is drawn. A single continuous foundation is made on the protrusion part. The program separates the raft from each other, so the effect of the columns on the ST is only visible on the ST. It does not separate, a single raft is defined, and the other columns, except ST, seem to be on a single raft in the report. As a result, is it wrong or correct to evaluate the data entry program in this way? Is it possible to do this? In this way, the effect of columns sitting on the raft slab is not taken into account in the foundation design. On raft-free raft foundation, raft slab borders should be formed with slab edge, continuous foundation should not be used. In the rafter raft foundation system, all columns and curtains should be connected to each other with continuous foundations, and raft flooring should be placed in the spaces formed in between.

 

[ceyhunyuksel]

I understand that if it is going to divide the raft, I think it would be more correct to divide it with dilatation. So there is a T-shaped raft in the project and the protruding parts of the raft are defined separately. Thank you

 

[Godfrey]

In my opinion, after all the analyzes and controls are done, when editing the drawings, a continuous foundation reinforcement configuration can be drawn to connect the two columns in the raft foundation, as shown in the figure. Because, in raft foundations, stress distributions and the highest reinforcement requirements occur at the bottom of the columns and at the axes connecting the columns, as in non-beam slabs. Therefore, arranging these critical sections with stress concentration in such a way that they have a high energy absorption capacity, in other words, a highly ductile behavior will be of great benefit compared to none.

 

[saridurmus]

My friend wants to make raft base like T or L from requests. I think it's okay, but let him create the shape he wants with the tile border. Let him send an account axle to the necessary places and have it analyzed.

 

[ceyhunyuksel]

In my opinion, after all the analyzes and checks are done, when editing the drawings, a continuous foundation reinforcement configuration can be drawn to connect the two columns in the raft foundation, as shown in the figure. Because the stress distributions and the highest reinforcement requirements in raft foundations are the same as in beamless slabs. It occurs at the bottom of the columns and on the axes connecting the columns. Therefore, it is of great benefit to arrange these critical sections with stress concentration in such a way that they have a high energy absorption capacity, in other words, a highly ductile behavior.

":cg3cdvar"] from my friend's requests wants to make raft base like T or L. I think it's okay, but let him create the shape he wants with the tile border. Let the axis of the account be posted to the necessary places and have the analysis done.

Thank you for the information, I couldn't explain it exactly because there is no program data, I think it was rushed in the example, but I took note of the information you provided, thank you.