Soil max tension increased from 7.93 to 13.50

[evanes07]

Have a nice day; I encountered a very interesting problem.. in the project I added, I made a small change with the foundation slab edge and basement curtains, I got a max ground tension of 7.93.. and unfortunately, before I could save it, the program gave an error in the analysis and then I played with a few slab edge basement curtains, max ground tension 13.50 .. can the max ground tension really notice such a gap with very small changes ? I can't amplify the foundation any more. I wonder how I can get those ground values again... I can handle other mistakes in the project. They're fine, but I don't understand how such a gap can be created with very small changes in the max ground stress value. Thank you.. Also, the file size is usually so high. , isn't this size too much for such a project ? Can you review?

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[Levent Özpak]

Good afternoon; I encountered a very interesting problem..I made a small change with the foundation slab edge and basement curtains in the project I added, I got the max ground tension 7.93..and unfortunately I couldn't save it, and there was an error in the program analysis. and then I played with a few slab edge basement curtains, the max ground tension increased to 13.50.. Really, with very small changes, can the max ground tension notice such a gap? I can't do more ampatage to the foundation, I wonder how can I get those ground values again...I can handle other mistakes in the project they are not a problem, but I don't understand how such a gap difference can occur with very small changes in the max ground tension value.. thanks..

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Hi, -First of all, you need to add the other project file so that the situation you mentioned can be examined.You should see both situations that make the difference you mentioned. Also, if you turn on the automatic backup option, you will not experience such data loss. If you change the movable position of the curtains, there may be almost no change in the average stresses in the entire raft area of the structure, but large changes may occur in the max and min values in very small areas. Max stress does not mean the behavior of the entire foundation. It may have reached this value only at one point. But the mean stress remained almost unchanged. -In the project you added, the stair arms are not connected to each other and the stair supports are defined incorrectly. Therefore, the structure deformation and analysis model are formed incorrectly. While determining the support conditions for the solution together with the structure, it should be determined that the edge of the stairs is connected to the element that is supported, and the edges that are not supported by the carrier element should be left blank. You can watch the training videos on the following links about creating stairs and determining the support conditions.

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[quote ="evanes07":3t6c185j"]Also, the file size is usually very high like this, isn't it too big for such a project? Can you examine it?[/quote] -It is normal for the file size to grow in analysis according to the semi-rigid aperture method. Good work

 

[evanes07]

Thanks for the answer, but the average tension has also decreased from 8-odd to 4-odds, all I need is to increase the max tension to 13 t/m2 or less. I can't give more amps to the foundation than anywhere else and D group ground... I need to decrease the average stress by 0.5-0.6.

 

[Levent Özpak]

Thanks for the reply, but the average stress also decreased from 8-odd to 4-odd, all I need is to get the max stress to 13 t/m2 or less. I can't give it to the D group soil... I need to lower the average stress by 0.5-0.6. I would appreciate your help in this regard..

-Making the small changes you mentioned, it is not the same but similar to the system where the ground tension decreases to 4 tf/m2. Create it and record and send this file to us, let's examine it. -Also, in the project you sent, the ground safety stress value was entered as 10 tf/m2. When the erroneous stairs are deleted and the analysis is made, the minimum stress formed by G+Q loading is 9.78 tfm2, the maximum stress value is around 14.1 tf/m2. When seismic loadings are used, the maximum soil stress is around 21 tf/m2.Soil stresses are exceeded in almost all of the foundation. cut.