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if using the transformation constraint handler with SP's .. the handler goes and sets the disp at the nodes directly. Yeah, below is my guess, please let me know if it is correct. The single-point displacement would be condensed to the right hand side of the equation to be treated as a load. So my ...

ArcLength, DisplacementConrol and others are Static integrators. Newmark, HHT are dynamic integrators. The integrators just define what the equilibrium equation is at each point in time. In OpenSees you specify in addition o others the Integrator and the Algorithm. It is the solution algorithm that...

1. you are not using LoadControl in the typical LoadControl sense, i.e. with an actual load applied. All LoadControl does is increment the time in the Domain by delta lambda. In you case there is no load, only a displacement path. The displaceent at the node controlled by the SP will be updated by ...

it is not possible. Arc-Length is a continuation method attempting to solve (9.15 in Crisfield) g(P,lambda) = Qi(P) - lambda *Qref, Qi the internal forces a function of fixed external forces P and displacements, and Qref the reference loads. arclength it is attempting to determine the lambda. the l...

I have some questions on the analysis module of opensees, regarding single point non-homogeneous constraint. 1. When performing material test of a uniaxial nonlinear material, use 'sp' command to impose a specified displacement path (time series object) to one DOF, then choose 'loadcontrol' as 'inte...

OK. Seems the command 'remove' can do the trick to remove the effect previous load pattern and reset the clock too. Hope the description of this command could be added into the manual. Thanks everyone paid attention to this post. My mistake. Seems the clock still continues from the previous analysi...

OK. Seems the command 'remove' can do the trick to remove the effect previous load pattern and reset the clock too. Hope the description of this command could be added into the manual.
Thanks everyone paid attention to this post.

silvia wrote:remove loadPattern $patternTag

This could be solution to my problem too... I will try it

Now, I am not sure, that I understand what you're trying to do here. Do you want to keep the results (deformed shape) from the first analysis or just run the second analysis like it is the first one? If what you're trying to do is the second option, then what i usually do is sth like this: source g...

you cannot impose accelerations using the multiple=support excitation command. you can only impose displacements. OK. Then the manual should be corrected on this. But still, it seems the DOFs which have been imposed displacement upon during the first analysis did not get released after the analysis...

Are you reseting pseudo time after each analysis? loadConst <-time $pseudoTime> Thanks for the attention. I understand that I can reset the pseudo time clock by using loadConst, but that would maintain or preserve all the previous 'pattern' objects, which is not what I wanted. I want to execute a b...

First of all, I am doing the transient analysis, with the constraints handled by 'Transformation', and solved by Newmark method. My goal is to impose a displacement input to one set of DOFs (named as Set S1) first, using 'MultipleSupport + groundMotion (-disp) + imposedMotion'. Analyze it and perfor...