The stresses in the raft are too low

H

huseyinakkus56

New Member
Hello.. I have a problem with the attached project. Apart from this, I have a question I would like to ask: 1-) The stresses in the raft are very low, can you examine it? 2-) Since there are curtains in the X direction, what is the logic of taking the Structural System Behavior Coefficient of 7 in the X direction and 8 when there is a frame in the Y direction? Why do we exert more earthquake force when there are curtains? Finally, I would like to ask our friend, who will examine the project, to examine whether I have a defect or an error according to the 2018 Regulation. Link:
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Hello My Suggestions: -- Solve your structure as a semi-rigid diaphragm,(IDECAD suggestion In this case, when you make a solution, it gives 2 errors. You can fix it. There is no problem in overturning.) --Fix the errors in the geometry control, --Ratyard basically only [ b]Check the floor safety...[/b] of the rafts without beams, the tension is around 20 t/m2. --The live loads on the beams are too high. If there is no wall, 0.3*.2 hy=0.06 t/m should be taken for 30/50 beams, --Increase the live load of the elevator machine floors, --6. reduce the roof slab loads on the floor, add on the elevator ceiling, --You can make the concrete C30. Unver ÖZCAN
 
"unver":1ou69jeh" said:
Hi My Suggestions: --Resolve your structure as a semi-rigid diaphragm,(IDECAD suggestion In this case, when you make a solution, it gives 2 errors. You can fix it. There is no problem in overturning.) --Geometry Fix the errors in the control, --The raft is basically only Check the floor safety of the rafts without beams..., the stress is around 20 t/m2 --The live loads on the beams are too high, if there are no walls, 0.3 on the 30/50 beams *.2 hy=0.06 t/m should be taken, --Increase the live load of the elevator machine floors, -Reduce the roof floor loads on the 6th floor, add on the elevator ceiling, --You can make the concrete C30. Unver ÖZCAN
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I did, but there is still a problem with the stresses on this raft.
 
Have you solved the semi-rigid diaphragm? I saw 20 t/m2 when I checked it after I thawed it. Unver ÖZCAN
 
Hello, In your Project: 1. There was a situation where you could not create mesh for D12 slab on the ground floor. The piece of slab that caused the non-mesh error was outside the structure, somewhere between the origin and your structure. That tile has been removed. 2. The main reason why you saw the raft stretching low was that the raft slab edge, which goes parallel to P15 and P16, was defined in pieces, although its angle did not change. The problem disappears when the raft edge is defined as flat and the raft laying is defined again.
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Thank you very much to both of you, Unver and Hakan. Also, can you answer this question, please? - Since there are curtains in the X direction, what is the logic of taking the Structural System Behavior Coefficient of 7, and 8 when there is a frame in the Y direction? Why do we exert more earthquake force when there are curtains?
 
"huseyinakkus56":19os9b65" said:
Thank you both very much, Ünver and Hakan.. Also, can you answer the following question, please? - The logic of taking the Carrier System Behavior Coefficient of 7 because there are curtains in the X direction, and 8 when there is a frame in the Y direction What is it? Why do we exert more earthquake force when there are shear walls?
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In high ductile structures, earthquake energy is tried to be compensated by deformation.When you add a shear to the system, we make the structure more rigid compared to the column-frame system and the translation is prevented more, ductility Therefore, when the curtain is added, the r coefficient is reduced and the earthquake effects are enlarged.
 
"HakanŞahin":3fkeafcu" said:
"huseyinakkus56":3fkeafcu" said:
Thank you both very much, Unver and Hakan.. Also, can you answer this question, please? - Since there are curtains in the X direction, what is the logic of taking the Structural System Behavior Coefficient of 7, and 8 when there is a frame in the Y direction? Why do we exert more earthquake force when there are curtains?
Click to expand...
In high ductile structures, earthquake energy is tried to be met by deformation. When you add curtains to the system, we make the structure more rigid compared to the column-frame system, the translation is prevented more, and the ductility decreases. Therefore, when the curtain is added, the r coefficient is reduced and the earthquake effects are enlarged.
Click to expand...
Thank you very much, Hakan Bey..
 
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