The OpenSees Community

#----------------------------------- # Main file (example3.3.tcl) #----------------------------------- # EXAMPLE 3.3 - MODIFIED. source model.tcl; # Builds the model. Basic units: kips, inches and seconds. set listofgmotionsChannel [open "listofgmotions.txt" r] foreach gmotion [split [read $listofgm...

Hi Frank. After days executing a lot of recursive simulations, I finally got a workaround to deal with the problem by defining "wipeAnalysis" at the end of each iteration (simulation). It seems that if my convergence algorithm is used, wipeAnalysis needs to be provided next. Can you take a look and ...

Hi Frank. Have you got some idea? Thanks.

Hi Frank. This is a quick question. In the following lines, what do mean: cxx, include and blitz? -I/usr/include/cxx -I/Users/fmk/include -I/Users/fmk/blitz I mean, are these folders required for compilation process? If so, what do they contain? Many Thanks! PS: Lines extracted from Makefile.def (MA...

Hi Frank. This year I am performing a large research for the Colombian Colciencias Institute, which aims to obtain the nonlinear dynamic response of three reinforced concrete structures subjected to a set of hundreds of strong earthquake scenarios. More than 5000 scenarios are intended to be assigne...

Hi Frank. In the following I describe a bus error found after executing a seismic simulation with convergence problems. Tested only on 2.1.0 and 2.2.0 versions of OpenSees under a macintosh system. The simulation is based on the parameter study section developed by McKenna and Fenves in 2007***, whi...

Frank, thanks for your detailed explanation. I think I got it!

Hi Frank. Could you please be more specific. Which part you disagree with or needs to be revised. Your response will be very useful for my current research. I am thinking of adding shear behavior to the elements, so I need to understand how OpenSees will perform the simulation. The documentation see...

Thanks a lot Frank! Those files seem to work like preprocessors.

Thanks Frank for the answer. I think the element you are proposing above only considers strain-rate effects due to load rate, like those effects proposed by Mander et al, 1988. The effects that I am referring to are those produced by axial force along the element due to its curvature. As the element...

Hi Frank/Silvia. I have a set of 100 accelerograms downloaded from the PEER NGA DATABASE in my hard disk. To execute the simulation, I need to use the command shown below rather than the specialized one (PeerNGAMotion), because the computer will not have access to the internet. In such a case, how c...

Hi Frank/Silvia. In the following I have rewritten my question so you can understand its context. There are at least two kinds of Corotational formulations most used by structural engineers. A formulation with linear effects of axial force and another one with second order effects of axial force. Th...

A last comment... According to what I have read, OpenSees uses the superposition principle in section Aggregator to add additional modes of structural actions (such as shear behavior) to the sections*. The disadvantage of doing so is that such modes will be treated as uncoupled. Additionally, since ...

Hi giovaing/andreascj. You might want to read this paper. I had the same question a few weeks ago. Seon M. Han, Haym Benaroya and Timothy Wei. Dynamics of Transversely Vibrating Beams Using Four Engineering Theories. Journal of Sound and Vibration, 1999. It is available for free at: csxe DOT rutgers...

Hi Frank/Silvia. Is there any unidimensional element type which is based on the corotational (or P-Delta) formulation and takes into account second order effects of axial force?

Thanks!