emergency help on silo raft foundation

[etriye]

First of all, I wish you a good work guys, my question is, there is a silo the top of the silo is made of steel accordingly a foundation with a raft system ] will be done silo(full state)+ steel system =400ton weight I gave 6.75ton G(dead) load to m^2 because it is in an area of 62.75m^2[ /color]... when I give a live load, it takes 30% of the live load because for the silos (from the regulation, earthquake regulation and ts6989) I got the R coefficient of 3, I got the Z2 floor Z3, I got a ground safety stress of around 15t/m^2 in negative stress control in raft foundations (50% I didn't get the increase) I did, I'm waiting for your help if I have a mistake in the modeling in order to stay on the safe side in the analysis? 1) I'm going to build a raft with a beam or a beam at a height of 100 cm, then around 5 tons of iron 90 m^3 around c25/30 concrete comes out ------------------------ ---------------------------------------------------------------- ---- 2) Or make a raft without beams and 120 cm high, then around 9 tons of iron and 110m^3 c25/30 come out --------------------- --------------------------------------------- I prefer 2nd I am using it from side to side because there is a functioning in the factory and I have to deliver it within 2 days. Which system would you use... I am waiting for your criticisms and opinions. Thank you.

 

[etriye]

Re: URGENT help about silo raft foundation by the way, I forgot to write in my message above. In the first system, negative stresses occur in the ground safety stresses. Also, while the dead load I entered into the raft was 1ton/m^2 (for vehicle loads), after the analysis -0.200ton A value of around /m^2 appears, I guess this problem is caused by negative stretching?

 

[Levent Özpak]

Re: URGENT help about silo raft foundation

by the way, I forgot to write in my message above. In the first system, negative stresses occur in the ground safety stresses. Also, when the dead load I entered into the raft was 1ton/m^2 (for vehicle loads) after the analysis, a value around -0.200ton/m^2 seems to be around -0.200ton/m^2. I guess this problem is caused by negative tension?

Hi, Beamed raft is basically the Q line and the - sign in front of G /Q in the reports is negative stress. It is related to the representation of the stress direction The sum of G+Q as absolute value expresses the stress resulting from vertical loads in the related raft slab.

 

[meraklı]

In the description section, it says fixed load for G and moving load for Q. The total is not written. And why are the values negative? Also why absolute value.

 

[etriye]

Thanks for your interest, Mr. Levent, so what we need to understand here is that there is no negative tension in the foundation - does the sign show the lower part of the foundation as a direction?

 

[HakanŞahin]

In the description section, it writes a fixed load for G, a moving load for Q. It does not write a total. And why the values are Negative. Also why the absolute value.

levent thank you for your interest, so we need to understand from here that there is no negative stress in the foundation - does the sign show the lower part of the foundation as a direction?

The G and Q values printed on the rafter raft slabs are the fixed and live load (G and Q) found as a result of the analysis shows. The direction of G and Q is vertical, therefore negative. See also for Definition of Global and Local Coordinate System and Element End Force Directions:

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Tensile control in raft plate, G and It is done automatically by looking at the sum of Q. In addition, stress control is performed for each foundation beam, and it is printed in the continuous foundation beam report. Good work