Pushover Analysis
Pushover Analysis
(OP)
I have done pushover analysis using software. I am wondering if there is a way to check that Force (Capacity) and Displacements obtained from the Pushover Analysis are reasonable? It may not be exactly but it will get me within the ballpark.
Thanks,
Tim
Thanks,
Tim






RE: Pushover Analysis
FAQ507-1570: concept/preliminary design
When in doubt, just take the next small step.
RE: Pushover Analysis
There are methods I know of for steel that allow you perform a pushover analysis using linear elastic software. For a particular load case, it requires making a new model each time a hinge forms, and summing up the results from each stage. There are some approximate corrective measures that need to applied to account for axial load (if it significant in your columns).
You have to assume a yield surface for your steel members (the relationship between bending moment and axial load). You also have to assume that plasticization of cross-sections occurs instantly. Also, you need to have a good idea of which load combination will govern, because you don't want to do this three or four times, IMO.
RE: Pushover Analysis
When in doubt, just take the next small step.
RE: Pushover Analysis
There is an appendix to one of the early FEMA documents that has an example where they have done this.... I used to have a copy of this. Haven't looked at it in years. I'll see if I can dig it up and let you know the reference.
RE: Pushover Analysis
RE: Pushover Analysis
I won't dispute that non-linear time history would be considered more accurate than a push-over. But, isn't the whole point of a push-over analysis that it is simpler and less time consuming to perform?
Also, please elaborate on the "inaccurate" comment. We're engineers.... we only care about accuracy on a practical level. We've not all going to go out there and write a PhD dissertation on every project solely for the sake of increased accuracy. I only need enough accuracy to demonstrate that the design / retrofit concept is sound or un-sound.
RE: Pushover Analysis