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by huffte
01 Jul 2024, 14:55
Forum: 02-Getting started with the modelling
Topic: Crisafulli Model
Replies: 1
Views: 42

Re: Crisafulli Model

As indicated in the Help System and references, the infill element is that "developed and initially programmed by Crisafulli [1997] and implemented in SeismoStruct by Blandon [2005], to be used (almost exclusively) in association with the infill panel element".
by huffte
28 Jun 2024, 14:59
Forum: 02-Analytical capabilities
Topic: Response spectum and ground motion parameters
Replies: 6
Views: 7503

Re: Response spectum and ground motion parameters

"Response Time-Histories" performs a response history analysis for a single-degree-of-freedom oscillator subjected to the input ground motion. You may run linear or nonlinear (by specifying a desired displacement ductility) response history. So this gives the entire history of response at ...
by huffte
25 Jun 2024, 13:20
Forum: 02-Analytical capabilities
Topic: PGA
Replies: 1
Views: 36

Re: PGA

As noted in the excellent Help system for SeismoSelect: "The peak ground acceleration of the selected record component (RotD50 for both NGA databases, RotD100 or maximum horizontal component for the ESM 2.0 database)" You can study the literature to discover how RotD50 and RotD100 are dete...
by huffte
21 Jun 2024, 14:47
Forum: 02-Getting started with the modelling
Topic: Apply Cyclic Load in Static Time-history Analysis
Replies: 3
Views: 72

Re: Apply Cyclic Load in Static Time-history Analysis

Try looking over some of the Verification Examples. Start with Steel Frame Example 1 on Page 88 of the Verification Manual. In this example, the applied load is a static time history displacement, which is the type you need it seems. See also Infilled Frame Example 1 on Page 101 of the Verification ...
by huffte
12 Jun 2024, 14:55
Forum: 03-Analytical/modelling capabilities
Topic: Linear Dynamic Analysis (LDA) - Modal Combination
Replies: 5
Views: 160

Re: Linear Dynamic Analysis (LDA) - Modal Combination

It seems that you want to run a dynamic response spectrum analysis, as opposed to a dynamic response history analysis. SeismoStruct may be the better choice for your analysis, if that is indeed the case. SeismoStruct will enable you to combine modes using ABSUM, SRSS, or CQC. SeismoStruct will also ...
by huffte
27 May 2024, 17:40
Forum: 02-Analytical capabilities
Topic: Pulse duration extraction
Replies: 2
Views: 226

Re: Pulse duration extraction

Yes. The pulse period can be extracted for records that are indeed, characterized by pulse-like history. The pulse period is the distance, in seconds, between successive peaks on the same side of the history plot. The duration is the total length from beginning to end of the pulse-type loading. So, ...
by huffte
26 May 2024, 16:23
Forum: 03-Analytical/modelling capabilities
Topic: Concrete Filled Steel Tubes (CFST)
Replies: 8
Views: 1413

Re: Concrete Filled Steel Tubes (CFST)

Maybe try running a linear analysis (Project Settings --> Analysis --> Run with Linear Elastic Properties check box) to check that your support conditions do not result in an instability. If you have not applied external permanent loading, then it could be that the structure, for some reason, cannot...
by huffte
18 May 2024, 18:18
Forum: 03-Analytical/modelling capabilities
Topic: Concrete Filled Steel Tubes (CFST)
Replies: 8
Views: 1413

Re: Concrete Filled Steel Tubes (CFST)

I have had great success modeling CFST in SeismoStruct using force-based inelastic frame elements without discretization. I have also had success using displacement basement inelastic elements with discretization. I am not sure what type element you are using, but try infrmFB or infrm DB without the...
by huffte
04 Apr 2024, 15:02
Forum: 04-Unexpected behaviour/errors
Topic: Pushover Analysis Error
Replies: 13
Views: 5265

Re: Pushover Analysis Error

I have encountered situations similar to that you describe. The issue was a real failure of the material based on fracture strain being achieved. I wonder if you might check the parameters in your material definition and in your performance criteria. Then compare limiting values you specified to the...
by huffte
18 Feb 2024, 16:18
Forum: 04-Unexpected behaviour/errors
Topic: Unable to apply the next load step
Replies: 5
Views: 712

Re: Unable to apply the next load step

It could be that the structure cannot withstand the higher seismic ground shaking. Even if you have no code checks, the rebar still has a fracture strain, the concrete still has a confined compressive strength, the confined concrete still has a strain limit, etc. . . .

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