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Ismail Hakki Besler
Administrator
Please load both of your model first and you will get support.
Hi Ismail
I appreciate your support
kindly check out the link
i attached both model
For 2007 parameters "
use A0=0.1
R=4
Normal ductility
response spectrum use
For 2018 parameters "
ss,s1 as interred inside model
R=4
Normal ductility
response spectrum use
-----------------------------------
use vertical seismic effect and the load combinations should be same in both
the lateral forces Fx and Fy for EX AND EY Should be same
thank sagain
I appreciate your support
kindly check out the link
i attached both model
For 2007 parameters "
use A0=0.1
R=4
Normal ductility
response spectrum use
For 2018 parameters "
ss,s1 as interred inside model
R=4
Normal ductility
response spectrum use
-----------------------------------
use vertical seismic effect and the load combinations should be same in both
the lateral forces Fx and Fy for EX AND EY Should be same
thank sagain
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Ismail Hakki Besler
Administrator
nurgulkaya
New Member
Hello;
In TBDY 2018 regulation, seismic forces are determined according to each element by dynamic analysis. Story forces are only used to determine irregularities. On the contrary, in 2007 regulation, seismic forces are determined according to stories with 'apply static lateral story forces calculated using modal combination'. And this method is different than 2018 dynamic analysis.
In 2018 Dynamic analysis, we use dynamic procedure. You can view the procedure :
If you apply the changes described below, you can see element forces are same or nearly same. And also, ıf you sum up the story forces, you can see they are nearly same.
1- Choose single modal analysis at 2018
2- Write Ao=1.0, I=1.0 R=1.0 at 2007
3- Export the 2018 spectrum to 2007
4- Write the column effective stiffeness is 0.7, beam =0.35 shearwall=0.5
5- Run both model.
After the analysis, you see column results:
Story forces: the difference between 2 regulation's story force = 3 %
Download the models :
Reasons of Differences:
1- In 2007, we don't put all the effective stiffness parameters to the shearwalls. And your building includes a great number of shearwalls.
2- Beacuse of the shearwall stifenesses, modal periods are different, so element seismic forces are little different.
3- In 2018, we use dynamic analysis and calculate seismic forces up to every single element. But ın 2007, we calculate seismic forces and distribute these forces. So main reason is that we use 2 different approach between 2007 and 2018.
In TBDY 2018 regulation, seismic forces are determined according to each element by dynamic analysis. Story forces are only used to determine irregularities. On the contrary, in 2007 regulation, seismic forces are determined according to stories with 'apply static lateral story forces calculated using modal combination'. And this method is different than 2018 dynamic analysis.
In 2018 Dynamic analysis, we use dynamic procedure. You can view the procedure :
If you apply the changes described below, you can see element forces are same or nearly same. And also, ıf you sum up the story forces, you can see they are nearly same.
1- Choose single modal analysis at 2018
2- Write Ao=1.0, I=1.0 R=1.0 at 2007
3- Export the 2018 spectrum to 2007
4- Write the column effective stiffeness is 0.7, beam =0.35 shearwall=0.5
5- Run both model.
After the analysis, you see column results:
Story forces: the difference between 2 regulation's story force = 3 %
Download the models :
You do not have permission to view link
Log in or register now.
Reasons of Differences:
1- In 2007, we don't put all the effective stiffness parameters to the shearwalls. And your building includes a great number of shearwalls.
2- Beacuse of the shearwall stifenesses, modal periods are different, so element seismic forces are little different.
3- In 2018, we use dynamic analysis and calculate seismic forces up to every single element. But ın 2007, we calculate seismic forces and distribute these forces. So main reason is that we use 2 different approach between 2007 and 2018.