Stress error at raft foundation

2

27defne27

New Member
Hello, good work, my raft foundation is sitting on a ZE class floor with a bearing coefficient of 1000, the ground safety stress is 11 min. Ger. It gives min stress error in the form of -0.01<0 G+Q, saves average and max stresses. How can I fix this error? I get a negative ground safety error. I tried to spread the foundation on the floor, it didn't have much effect, I'm waiting for your help, thanks.
 
Hi Basically, if you don't tick the negative ground stress control option, the control will not be performed. The value is so small it can be neglected.
 
The raft basically has a modeling error. Due to the S9 column, it was out of the foundation, so the fundamental analysis could not be done correctly. Take the raft foundation slab edge line outside the column. Since you did not select the "Use earthquake loads in the ground safety control of beamless rafts" option in the analysis settings, no control was made for the earthquake situation. You should select this option. In soil stress control of raft foundations, use average stresses is selected. I recommend you to analyze before choosing this option. With TBDY 2018, the concept of soil bearing capacity came to be used in foundation calculations instead of soil safety stress. Detailed information is given in the link below. In the analysis settings, you need to enter the ground bearing strength value for the TBDY 2018 analysis.
You do not have permission to view link Log in or register now.
With axial force issue cross section of beams can be increased. It would be appropriate to choose A24 type in X and Y directions as the carrier system type.
 
I tried all the details you mentioned one by one, but to no avail, on the contrary, the system gives more errors. The max stress error in the floor and rib beams continues. Can anyone share the idea how we can go about this error, please have a good work.
 
"27defne27":htwp7shb" said:
I tried all the details you mentioned one by one, but it didn't help at all, on the contrary, the system gives more errors. The max stress error in the floor and rib beams continues. Can anyone share an idea how we can go about this error, please have a good work.[ /quote] You have to do everything Yasin says, you can't give up because there are more errors anyway, you will have made a wrong design.In order to overcome the Nmax error, increase the size of the relevant beams.
Click to expand...
 
I'm trying to solve the problems in my project, I don't necessarily say that I can't do what they say, when I do, the average and max stresses basically exceed the ground safety negative error and the old faults continue. The structure is zero to the right and left adjacent to the front road. I can only make an apartment at the rear. Despite the 2 m close apartment patch, the problems continue to solve these problems. I'm asking for advice, maybe there is another way good work.
 
"27defne27":2w2u9wfg" said:
I'm trying to solve the problems in my project, I don't necessarily say that I can't do what they say, when I do, basically the average and max stresses exceed, the ground gives a negative error of safety and continues with the old mistakes. Even though I patched the apartment close, the problems continue, I'm asking for an opinion that maybe there is another way to solve these problems. Good work.
Click to expand...
I understand what you are saying, we are trying to help anyway, the ground safety tension has already disappeared, the concept of bearing capacity has arrived. Are you sure you entered the correct value instead? I couldn't look at how many m2 projects are. Isn't a 2 m cantilever too extreme? Making a cantilever may also not solve the safety stress problem. You can reduce the stress on a point by adding an extra column. For example, first of all, are you sure what your bearing capacity value is correct (I'm not saying safety stress)
 
If you have made the corrections I mentioned, send the final version of your project and we will examine it. Be sure to enter "ground bearing capacity".
 
GROUND BEARING STRENGTH IS EXACTLY WHAT YOU CALL ME THE VALUE THAT GEOLOGICAL ENGINEER GIVES ME 11 I ENTER IT I DID EVERYTHING YOU SAID YES. NOW THERE ARE ONLY PROBLEM. BEFORE ADDING COLUMN, THE AVERAGE STRESS WAS 14.79 MAX STRESS WAS 21.11, WHEN I ADDED COLUMN, THE AVERAGE STRESS WAS 15.23 MAX STRESS WAS 21.97.
 
Ask the geophysical engineer for the Ground bearing capacity in accordance with TBDY 2018. This value can be 2.5-3 times the soil safety stress value. Check the page below for detailed information.
You do not have permission to view link Log in or register now.
 
Hello there; I made some suggestions and edits in your project, your project is attached.
You do not have permission to view link Log in or register now.
The edits are as follows: - We changed the hollow slab thickness to 7cm - We changed the hollow slab rib thickness to 12cm - We have rearranged your beam dimensions from 35/70-80-90 to 35/50-60 (a maximum of 30+35=65cm wide beams can be connected to a 30-column) - We removed the beams at the cantilever end, and operated the ribs on the cantilever floor as cantilevers. - We changed the sagging beams from 25/50 to 30/50 - We changed your raft thickness to 60cm. There is no mistake in your project, but as other friends have said, it is useful to talk to the geotechnical engineer who prepared the ground report. As before, it is not enough to control the ground tension according to the G+Q combination. Or you don't have a chance to increase 50% in combinations with earthquakes. Best regards.
 
first of all, thanks. Hollow plate thickness 7 cm, rib beam height can be 35? If it is 7cm in general, the beam height is 32, if the plan is 10 cm, it is called beam 35?
 
Hello there; It can be 7/35, the dimensions of the hollow filler material you will use will change. Brick or Foam both can be found in any size you want. Besides, it can save 32cm in your project.
 
take it easy, I looked at the 2018 earthquake regulations, but I couldn't see or understand... Is it obligatory for you to select the negative stress button, which is the underline in this picture, in the analysis settings in idecad, or is it up to us, thanks in advance
 
You must log in or register to reply here.
Back
Top