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Pushover Analysis Plastic Hinge Locations

04/28/2020 3:13 AM
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#1

Re: Pushover analysis plastic hinge locations

04/28/2020 3:47 AM

As there is a <...we...> at that location, what advice can the rest of the <...we...> give about the validity of <...our model...>?

Ask for training from the <...we...>!

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#2

Re: Pushover analysis plastic hinge locations

04/28/2020 7:13 AM

..."In general, linear procedures are applicable when the structure is expected to remain nearly elastic for the level of ground motion or when the design results in nearly uniform distribution of nonlinear response throughout the structure. As the performance objective of the structure implies greater inelastic demands, the uncertainty with linear procedures increases to a point that requires a high level of conservatism in demand assumptions and acceptability criteria to avoid unintended performance. Therefore, procedures incorporating inelastic analysis can reduce the uncertainty and conservatism.

This approach is also known as "pushover" analysis. A pattern of forces is applied to a structural model that includes non-linear properties (such as steel yield), and the total force is plotted against a reference displacement to define a capacity curve. This can then be combined with a demand curve (typically in the form of an acceleration-displacement response spectrum (ADRS)). This essentially reduces the problem to a single degree of freedom (SDOF) system.

Nonlinear static procedures use equivalent SDOF structural models and represent seismic ground motion with response spectra. Story drifts and component actions are related subsequently to the global demand parameter by the pushover or capacity curves that are the basis of the non-linear static procedures."...

..."Pushover analysis is a static procedure that uses a simplified nonlinear technique to estimate seismic structural deformations. Structures redesign themselves during earthquakes. As individual components of a structure yield or fail, the dynamic forces on the building are shifted to other components. A pushover analysis simulates this phenomenon by applying loads until the weak link in the structure is found and then revising the model to incorporate the changes in the structure caused by the weak link. A second iteration indicates how the loads are redistributed. The structure is “pushed” again until the second weak link is discovered. This process continues until a yield pattern for the whole structure under seismic loading is identified."...

https://en.wikipedia.org/wiki/Seismic_analysis

https://www.sciencedirect.com/topics/engineering/pushover-analysis

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#3

Re: Pushover Analysis Plastic Hinge Locations

04/28/2020 12:32 PM

While performing earthquake pushover analysis on the building, why do we force the plastic hinge locations, such as indicating in our model instead of waiting for them to occur naturally as we push it more?

Maybe to simulate post-yield behavior.

"For nonlinear static, and nonlinear direct-integration time-history analyses, users may simulate post-yield behavior by assigning concentrated plastic hinges to frame and tendon objects."

https://wiki.csiamerica.com/display/kb/Hinge

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#4

Re: Pushover Analysis Plastic Hinge Locations

04/28/2020 10:40 PM

I don't see a question in your post. all I see is LIKE, SHARE, and TWEET. I am using Google Chrome.

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#5
In reply to #4

Re: Pushover Analysis Plastic Hinge Locations

04/28/2020 11:57 PM

I see exactly the same thing in Safari on a Mac.

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#6
In reply to #5

Re: Pushover Analysis Plastic Hinge Locations

04/29/2020 6:47 AM

I think the OP inadvertently redacted his own post...

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#8
In reply to #6

Re: Pushover Analysis Plastic Hinge Locations

04/29/2020 9:37 AM

There's a word for that...

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#7
In reply to #5

Re: Pushover Analysis Plastic Hinge Locations

04/29/2020 8:18 AM

...ditto...I use firefox.

...and judging by the answers - it is a subject outside my scope of expertise.

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#9

Re: Pushover Analysis Plastic Hinge Locations

04/29/2020 12:45 PM

I didnt delete my post. I dont know how it got deleted.

I was asking , in pushover analysis, why do we force the plastic hinge locations in the model, instead of waiting the program to come up with the yield points naturally. And still waiting for an answer. Thanks

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#10
In reply to #9

Re: Pushover Analysis Plastic Hinge Locations

05/04/2020 11:23 AM

And still waiting for an answer. Thanks

One reason is to model post-yield behavior. See #3.

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