Continuous Foundation Reinforcement and Soil Safety Stress Problem

S

serky

New Member
Hello, although the ground safety stress is not very low in the attached project, no matter how much I enlarge the foundation beams and flats, the reinforcement in many foundation beams is insufficient and the ground safety is negative. I would appreciate it if you could check if there is any mistake in the modeling. Although there is no basement in the project, the excavation depth will be 3m. I modeled the 3m depth on the ground floor by giving elevation to the columns, curtains and continuous foundation. Is this modeling correct? Looking forward to your help, thanks in advance.
 
Hello, There does not appear to be a problem with the basic data entry. One of the reasons that continuously increase the foundation stresses is the negative elevation of the foundation. In this case, an additional stress on the foundation equal to the soil unit weight*foundation depth is applied. If there is no fill on the foundation, you can ignore the soil tension by entering the soil unit weight as zero. The lack of equipment is due to stirrups. By increasing the foundation height, larger stirrup diameters can be selected. Good work
 
Define the basement from the floor settings, by giving -280, why did you plant the column curtain and foundation down. Your foundation in column no.1 and no.4 was fragmented.
 
For example, if there is a 20 x 20 m raft-based structure with 1 m thickness at -6.mt elevation, if we do not enter the soil unit volume weight as zero, does this 2400 M3 soil weight enter the calculation of approximately 5000 tons of soil safety stress? I could not see where the soil unit volume weight was used in the calculations. Thanks
 
Are you going to fill 6 m? If so, you must give this load to the foundation. I also couldn't understand why there was such a padding, but it's not negligible. Soil unit weight does not automatically load on your foundation. Since it does not come, it does not enter the floor safety account.
 
Just like you said, I wanted to ask whether the soil unit weight is automatically taken into account. If not, we made a single foundation, continuous foundation or raft foundation in our project. We can enter zero. Is it true?
 
No, what you said is not true. Soil load on single foundation and continuous foundation is taken automatically according to foundation level and ground unit weight. From left to right, 0 -2 -4 and -40 m elevations, for example, are gradually increasing in soil stresses. If you give the ground unit weight zero, it is calculated as zero. The level to be entered is basically the level to be entered.
 
Mr. İsmail First of all, the question-answer and support environment here is very important and useful for us, I would like to thank all the idecad team for their understanding and help. As far as I understand, in the single foundation in the example, (foundation level x foundation area x soil unit volume weight) is calculated and added to the soil tension automatically. I am trying to understand how the soil unit volume weight is taken into account in continuous and raft foundations. Soil stresses did not change when I entered the soil unit volume weight as zero in my experiments with a few models with raft and continuous foundation. The point that can be taken into account here is the ampatments of the continuous foundation or if there are protrusions on the raft foundation, can these regions be? The point I am trying to understand is that in the solution of the problem 5.2 below, the height of the excavated part is multiplied by the unit volume weight of the soil and subtracted from the stress caused by the structure when calculating the net base stress in the solution of the problem 5.2. Is this subtraction work done in the soil survey report and the soil safety stress that we receive is calculated accordingly, or do we do this calculation manually? do we need to do?
 
"muratk":131yhsvw" said:
... The point I am trying to understand is that in the solution of the problem 5.2 below, when calculating the net base stress, the height of the excavated section is multiplied by the unit volume weight of the soil and subtracted from the stress caused by the structure. Is the soil safety stress calculated according to this or do we have to do this calculation manually?
Click to expand...
Hello, Investigation is made according to the soil safety stress value entered in the program. No action is taken in the soil stress calculations due to the excavated soil. According to which situation the soil safety stress value is calculated. It would be appropriate to ask the person/institution that prepared the ground survey if it is given.
 
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