Under what circumstances is it not necessary to consider the effects of earthquakes on towers?
Thread Content
It doesn’t seem to mention this in the specifications; it appears that the impact of earthquakes needs to be calculated regardless of the seismic design intensity level Should 6 degrees and 7 degrees also be considered?
When the design seismic intensity is less than 7 degrees, it is not considered...
Tables 7 and 9 in the standard only provide data for levels 7 to 9
I don’t think this means that we don’t need to consider values below seven degrees.
1. Levels below 7 are not considered. 2. No skirt supports are used; instead, ear-type supports are used to hang it on the frame
The last edit to this post was made by tianchx on 2017-7-25 at 14:27. Clause 1.0.4 of GB50761-2012, the \"Code for Seismic Design of Steel Equipment in Petrochemical Industries\", specifies that \"petrochemical equipment located in areas with a seismic design intensity of 6 degrees or a design basic seismic acceleration of 0.05g or higher must be designed for seismic resistance.\" Meanwhile, Clause 3.1.3 states that \"in areas with a seismic design intensity of 6 degrees or a design basic seismic acceleration of 0.05g or less, it is not necessary to perform calculations related to seismic forces on the equipment, but seismic resistance measures must still be satisfied.\" According to the NB/T47041-2014 standard, seismic calculations are performed only when the seismic design intensity is 7 degrees or higher.
Thank you, I’ve learned something new. I hope the tower management could put such rules into written form.
It wasn’t specified. I even went ahead and checked the 1992 version of the standard for \"Steel Tower-Type Vessels,\" but it also didn’t clearly state anything
The seismic resistance is only 7 to 9; values below 7 are too low and not considered, while values above 9 are too high and cannot withstand the forces. Tower vessels should ideally be designed to withstand seismic forces, as the materials contained within them are usually toxic or flammable and explosive.
1. Levels below 7 are not considered. 2. No skirt supports are used; instead, ear-type supports are used to hang it on the frame