Ground control period

[abaci09]

I have an original building in my hand. 1st degree earthquake zone consisting of B+Z+4nk+Çk, no A1, Rx=Ry= 7 . my ground class is Z3 ( Ta=0.15 Tb=0.60 ) periods in my design 1.mod=0.744 , 2.mod=0.63 ....... Is it better if my building period is greater than Tb or Ta <T<Tb mi olmalıdır.

 

[proisa]

I have an original building in my hand 1st degree earthquake zone consisting of B+Z+4nk+Çk, no A1, Rx=Ry= 7. my ground class Z3 ( Ta=0.15 Tb=0.60 ) In my design, periods are 1.mod=0.744 , 2.mod=0.63 ....... Is it better if my building period is greater than Tb or Ta <T<Tb mi olmalıdır.

Bina birinci modunun Ta<T<Tb arasında kalması gerekir diye bişey söz konusu değildir.
Bina modlarının Tb den büyük olması bina peryodunun zemin hakim periyodu ile çakışmadığını gösterir.
Bu durumda detaylı dinamik analiz raporunda göreceğiniz gibi Spektrum katsayısı S(T) ve Spektral ivme Katsayısı A(T) de yönetmelikteki bağıntılardan dolayı azalma olur.
Bunların sonucu olarak binaya etki eden elastik spektral ivme ve dolayısıyla deprem yükü azaltılır.

Ancak burada şöyle bir ikilem var ki; 6 katlı bir bina için 1. peryodun 0.744 olması bina rijitliğinin göreceli olarak az olduğunu gösterir.
Ayrıca böyle bi sonuç, bina geometri olarak dar bir oturuma sahipse yada uzun ince bir bina ise de meydana gelebilir.
Ama yönetmelik olarak bir sorun teşkil etmez. Burada insiyatif ve karar mühendisin elindedir.

 

[siromar]

It is natural to have T&gt;Tb on 6 floors in the 1st degree earthquake zone, this is what is desired in the spectrum anyway, avoiding the Ta-Tb range, keeping the building away from resonance... you will provide the building with sufficient ductility and sufficient rigidity by modeling and reinforcement, and by making displacement, you will create a building that will absorb a great amount of energy, giving importance to rigidity and 2nd order effects etc. What happens to buildings with 4-6 floors under horizontal load shows the importance of spectrum...

 

[proisa]

It is natural to have T&gt;Tb on 6 floors in the 1st degree earthquake zone, this is what is desired in the spectrum anyway, avoiding the Ta-Tb range, keeping the building away from resonance... the building has both sufficient ductility and You will provide the ductility that will be of sufficient rigidity with modeling and reinforcement, and you will create a building that will dissipate enormous energy, and you will also attach importance to rigidity and prevent 2nd order effects, etc... What happens to 4-6 storey buildings at horizontal load shows the importance of the spectrum...[ /quote] Soil spectrum is really important. If you examine the recent Van earthquakes, in the buildings destroyed as a percentage (x-storey destroyed / x-storey total building), 4-storey buildings are in the 1st place, 5-storey buildings are in the second place, while in 6-storey buildings, the percentage of destruction is very small 6 and When the Prime Minister went to Van, it was said that you are still building 8-storey buildings... We are used to building 4-5-storey buildings in Turkey, so how few floors are there? We think it&#39;s that safe. As for rigidity; In order to move a 6-storey building away from the dominant period of the Z3 floor class, we need to build delicate buildings. Even in buildings close to a square shape that sit on a large area, it is necessary to design very very delicately. How true this is is a matter of debate. For this, I wrote that the stiffness is relatively low. It is certainly not possible to say that it is less or insufficient. In my opinion, the healthiest way to avoid resonance is to determine the number of floors of the building in a way that avoids the ground period... This doesn&#39;t seem possible under the conditions of Turkey at the moment.... Good work everyone....