Understanding Silo Support Condition During Analysis.
Understanding Silo Support Condition During Analysis.
(OP)
Hello,
I en-route in designing a Raft foundation with 6 tall circular hopper bottom Silos i.e., Silos with steel column legs carrying the silo structure.
The vendor data and drawing indicates the columns connection at the interface column – raft interface is using only 2 bolts, placed on each side of the web of the I – section column.
The use only 2 bolts means, the connection is considered as pinned. Below is my question.
1) Should I consider during analysis, that the support is pinned structure.?
2) If I consider pinned support, how can I generate the overturning moment on the raft for dead, live and lateral loads like wind and seismic.
3) Should I be designing the raft for only tension and compression forces obtained from Pinned Support condition or Should I consider a fixed support in order to generate the moments at each supporting column.
Kindly note, from the vendor technical inputs, he is supplying horizontal and vertical forces for Dead, Live, Wind and Seismic load cases (without moment) and then has another 2 rows with a huge moment of 5700 kn-m for wind load case and 59000 kn-m for seismic load case.
So I want to understand the procedure in generating these forces before I carryon with the analysis of Raft Foundation. Kindly share your valuable experience and thoughts which will help me.
I en-route in designing a Raft foundation with 6 tall circular hopper bottom Silos i.e., Silos with steel column legs carrying the silo structure.
The vendor data and drawing indicates the columns connection at the interface column – raft interface is using only 2 bolts, placed on each side of the web of the I – section column.
The use only 2 bolts means, the connection is considered as pinned. Below is my question.
1) Should I consider during analysis, that the support is pinned structure.?
2) If I consider pinned support, how can I generate the overturning moment on the raft for dead, live and lateral loads like wind and seismic.
3) Should I be designing the raft for only tension and compression forces obtained from Pinned Support condition or Should I consider a fixed support in order to generate the moments at each supporting column.
Kindly note, from the vendor technical inputs, he is supplying horizontal and vertical forces for Dead, Live, Wind and Seismic load cases (without moment) and then has another 2 rows with a huge moment of 5700 kn-m for wind load case and 59000 kn-m for seismic load case.
So I want to understand the procedure in generating these forces before I carryon with the analysis of Raft Foundation. Kindly share your valuable experience and thoughts which will help me.






RE: Understanding Silo Support Condition During Analysis.
If in doubt, check with the vendor in question.
RE: Understanding Silo Support Condition During Analysis.
RE: Understanding Silo Support Condition During Analysis.
If the Silo analysis is analyzed using a pinned support condition, why does the supplier provide a global overturning moment ?
Please share your valuable thoughts.
Thank you.
RE: Understanding Silo Support Condition During Analysis.
Note, this assumes the 'top' end of the columns (where they join the silo) are moment connections.
That is what I would expect at least, you will need to clarify with the Vendor.
RE: Understanding Silo Support Condition During Analysis.