hamidun
Mechanical
- Jun 3, 2014
- 80
Dear All,
I have a problem in interpreting the result of SAP2000.
Let me begin my story, I am using SAP2000 to design dome roof structure for storage tank. The tank has 48.54 m diameter and 10.97 m height.
I am using shell > spherical dome for the roof model. The area section is thin shell 6 mm.
Total rafters I used for the model are 20 Main rafters (H Beam 150 x 150) and 300 for secondary rafters (UNP 150 x 75).
And I used 60 Main girders (H Beam 150 x 150) and 280 secondary purlin (UNP 140 x 60). I used A36 for the structure. (See attached file)
I have applied load uniform to frame for live load and manually input quake load through x and y axis of the model. (I hope you guys get what I mean). I have also released moment at the point where it will be bolted.
After I run the simulation, I get this weird result. The highest PMM ratio happens in the first main girder (H Beam 150 x 150) from the outer shell. What I expect is the highest PMM would be at the 20 Main rafters, am I right? I mean, at least that the 20 main rafters should take loads as much as the main girder. But in this case, the loads seem to gather at the first main girder. CMIIW
I have attached the model and result where I think the weird PMM ratio takes place.
Please, help me interpreting this software result.
Thank you!
Note: I'm kind of autodidact SAP2000 software user.
I have a problem in interpreting the result of SAP2000.
Let me begin my story, I am using SAP2000 to design dome roof structure for storage tank. The tank has 48.54 m diameter and 10.97 m height.
I am using shell > spherical dome for the roof model. The area section is thin shell 6 mm.
Total rafters I used for the model are 20 Main rafters (H Beam 150 x 150) and 300 for secondary rafters (UNP 150 x 75).
And I used 60 Main girders (H Beam 150 x 150) and 280 secondary purlin (UNP 140 x 60). I used A36 for the structure. (See attached file)
I have applied load uniform to frame for live load and manually input quake load through x and y axis of the model. (I hope you guys get what I mean). I have also released moment at the point where it will be bolted.
After I run the simulation, I get this weird result. The highest PMM ratio happens in the first main girder (H Beam 150 x 150) from the outer shell. What I expect is the highest PMM would be at the 20 Main rafters, am I right? I mean, at least that the 20 main rafters should take loads as much as the main girder. But in this case, the loads seem to gather at the first main girder. CMIIW
I have attached the model and result where I think the weird PMM ratio takes place.
Please, help me interpreting this software result.
Thank you!
Note: I'm kind of autodidact SAP2000 software user.
