ground safety stress problem

[merve]

Hello, I wanted to make a highly ductile solution because of the 1st degree earthquake zone in the calculation of a housing project to be built in Karabük, but since I could not eliminate the b error in polygon columns, I made a mixed solution. Since the structure is adjacent from 1 side, the ground safety stress limits on the beamless raft exceeded the limits, I had to try to make rafters with beams, but since the building seating area is small, there is no room to move when I connect the beams under the curtains required for alfas in the mixed calculation, and in most of them, the ground safety stress exceeds the limit and I get the insufficient reinforcement message. .no matter what I did, I couldn't get out of it. moreover, I cannot use 18 gauge reinforcement as requested by the contractor company. If you can exceed the stress limit, I think basically 18 can be used. Looking forward to your feedback. Thanks in advance.

 

[Levent Özpak]

Hello, It is recommended to consider the following cases for data entry in your project. 1- In your project, it says -3 in front of the 3rd basement floor in the Floor General Settings. And there are no basement perimeter curtains. Therefore, the upper rigid basement floor number -4 should be entered. 2- The value of alphaS in the Y direction is 0.54 . Therefore, it would be appropriate to enter Ry as 5.65. (Alpha s values are given under the title of Earthquake Regulation General Report/Reason for Selection of R coefficient.) 3- In the program, superstructure interactive solution is foreseen for beamless raft foundation and continuous foundations. (In the regulation, superstructure interactive solution is requested for C and D group floors.) Good work

 

[merve]

Thanks for your help. I have one more question, do we need to re-enter the selected R value, which is entered under the title of R coefficient selection and reason in the post-analysis calculation reports, and if the selected R coefficient is different? That is, should we continue to analyze until the entered and selected R coefficient are equal, or is it appropriate to be different if it meets the regulations?

 

[Levent Özpak]

thanks for your help. I have one more question, should we re-enter the selected R value, which is entered under the heading of R coefficient selection and reason in the post-analysis calculation reports about the R coefficient, and if the selected R coefficient is different, and have the analysis done again? In other words, should we continue to analyze until the entered and selected R coefficient are equal, or is it appropriate to be different if it meets the regulations?

In case of B1 irregularity, which is stated in TDY2007 item 2.3.2.3, the R coefficient entered in the program is 1.25th(min) value is multiplied and considered as the selected coefficient R. This value does not need to be re-entered in Analysis Settings.

 

[merve]

Thank you very much for your reply. good work.