Search found 975 matches

by huffte
18 Feb 2024, 16:18
Forum: 04-Unexpected behaviour/errors
Topic: Unable to apply the next load step
Replies: 4
Views: 90

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. . . .
by huffte
14 Jan 2024, 16:56
Forum: 03-Analytical/modelling capabilities
Topic: damping
Replies: 8
Views: 37295

Re: damping

The nonlinear load displacement behavior adds effective damping. For overall elastic, initial component damping, that is up to the user. There are many different philosophies regarding this initial damping. Some would say the traditional 5% is excessive for nonlinear analysis. Some would say this in...
by huffte
14 Jan 2024, 16:51
Forum: 03-Analytical/modelling capabilities
Topic: Confinement factor
Replies: 11
Views: 44180

Re: Confinement factor

You can specify "Output Stresses and Strains" at selected points in the pre-processor "Analysis Output" tab and then plot stress versus strain for those points in the post-processor. You need to select the appropriate points in order to make the results available in the output. I...
by huffte
07 Jan 2024, 17:45
Forum: 03-Analytical/modelling capabilities
Topic: Incremental Dynamic Analysis
Replies: 5
Views: 3052

Re: Incremental Dynamic Analysis

The curve multiplier depends on the units used in your accelerogram input and the units valid in SeismoStruct. Typically, an accelerogram is input with units of g. A typical unit in SeismStruct is cm/sec/sec. For this example, the curve multiplier would need to be 981 to convert the input accelerati...
by huffte
06 Jan 2024, 18:48
Forum: 03-Analytical/modelling capabilities
Topic: What is the difference between the pushover module and the static time-history module?
Replies: 4
Views: 3505

Re: What is the difference between the pushover module and the static time-history module?

I believe if you will examine ASCE 7 closely, you will find that the 100-30-30 rule is applicable for (a) the equivalent lateral force procedure and (b) dynamic response spectrum analysis using modal superposition. When response history analysis (as opposed to response spectrum analysis) with proper...
by huffte
23 Dec 2023, 16:42
Forum: 03-Unexpected behaviour/errors
Topic: Damping
Replies: 1
Views: 3359

Re: Damping

This is not necessarily a surprise. You could get different accelerograms matching the same target spectrum. The key is to examine the accelerogram response spectrum and compare to the target response spectrum in all three cases. If the match between ground motion and target spectra is satisfactory,...
by huffte
29 Nov 2023, 19:39
Forum: 02-Analytical capabilities
Topic: Difference Between Seismosignal and Seismosignal 3D
Replies: 3
Views: 4712

Re: Difference Between Seismosignal and Seismosignal 3D

Yes, that is correct. By directional spectra I mean the orientation-dependent rotated component spectra (RotDxx).
by huffte
26 Nov 2023, 21:46
Forum: 02-Analytical capabilities
Topic: Difference Between Seismosignal and Seismosignal 3D
Replies: 3
Views: 4712

Re: Difference Between Seismosignal and Seismosignal 3D

SeismoSignal3D will produce directional spectra, as you have noted. SeismoSignal3D does not have the capability of producing either (a) response history analyses for SDOF systems found in SeismoSignal or (b) inelastic spectra found in SeismoSignal. I have found both programs to be extremely useful a...
by huffte
18 Nov 2023, 22:39
Forum: 02-Analytical capabilities
Topic: vertical component of synthetic accelerograms
Replies: 3
Views: 4465

Re: vertical component of synthetic accelerograms

As long as the defined target response spectrum is a vertical component response spectrum, there is no reason that SeismoArtif wouldn't work very well. So the key will be coming up with the appropriate vertical target spectrum. In the past, vertical spectra were taken to be 2/3 of the horizontal geo...
by huffte
16 Nov 2023, 16:47
Forum: 02-Getting started with the modelling
Topic: one modeling problem
Replies: 3
Views: 6897

Re: one modeling problem

Simply define separate material properties for each in the "Materials" tab and choose the appropriate "Reinforced Concrete" section in the "Sections" tab. Each of the reinforced concrete sections permits the use of different materials for the stirrups (transverse reinfo...

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