Beam Rebar and Raft Problem

S

serky

New Member
Hello, As seen in the picture in the attached project, there are too many reinforcements to be applied in K44-K45 and K54-K55 beams. How can I find a solution to this? I can't increase the beam width. I arranged the foundation of the building as a rafter raft, but I could not overcome the problem of insufficient ground safety stress in some rafts, so I removed these rafts and the problem was solved. How accurate is it to organize a system in this way? P4 Curtain does not provide cutting safety. Project :
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I would appreciate your help.
 
The fact that the relevant beams receive such intense additional reinforcement is due to the rigidity of the wall in the middle. Turn this wall into a column, the beam spans will increase and the additional reinforcement will decrease. If there is no architectural concern, try to put the curtains on the façade axes in every good direction. The system should be symmetrical and balanced in both directions, it should work very comfortably. If you solve the foundation as a raft without beams, you will overcome the stress problem. Good work. G.KÖSE
 
In modal analysis, your 1st natural vibration period consists of the torsion effect. The fact that the system rigidity is in the center is due to insufficient curtains on the outer axles. In a similar system, I used L polygon columns in the corners of the building with dimensions close to the curtain, it contributed a lot to rigidity. It would be better if you make round columns with L columns.( I don't know what the architect friend will say.!!) G.KÖSE
 
Thank you for your answers. I tried to remove the curtains, but again there is too much reinforcement in the beams in that area. When I lifted the curtains, the 1st period again increased the torsion and mass participation rate. For architectural reasons, I cannot put the curtains on the façade axes, and I cannot even change the direction of the outer columns. I will try to extend the side columns in the short direction by 10 cm. Thank you very much for your help, keep up the good work.
 
In my opinion, your beam dimensions are also considered low. 5-6 m spans, I wouldn't have crossed with 40/30, 50/30 beams In addition, if the architecture is not a big problem, I would try to make the continuous horizontal beams in the same size and offset. I agree with Güray on the issue of Rizitness. Those regions were the most rigid regions of the system in terms of both columns and beams. So you have to distribute the stiffness a bit more. It's hard to advise without its architecture. Maybe you should use more curtains, or you should always remove them and design the system without curtains. Thus, you can distribute the rigidity. That's the first thing that comes to mind for now. Good luck with.
 
Thanks for your help. Although I removed all the curtains except the elevator curtains, the 1st mode torsion and additional reinforcement in the beams are still too much. Good work.
 
Hello, I made changes to the project and arranged the foundation as a rafter raft. but when I wanted to make raft without beams, I could not get over the reinforcement and ground safety stress problem. I will be glad if you help me. Thanks in advance. Project:
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Your foundation system was solved with a little intervention in your project (see analysis settings, foundation height and elevator bulkheads), but max. You have beams in pursanta.
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Good work. G.KÖSE
 
Thank you so much. I arranged the project as a rafter raft and got a more economical result. I added the project. I would be glad if you could review the project. I'm wondering if there is an error in the analysis settings or elsewhere. Thanks a lot, good work. Project:
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