IDA not yielding results
Posted: 31 Aug 2020, 03:23
Hello all,
I hope you are well! I am running an IDA analysis with Seismostruct for a bridge model and I am using the software's code-based checks for chord rotation and shear. I am applying a suite of ground motions and for many of them, it seems to produce results, while for others it doesn't. As an example I will note that I have applied an excitation of a peak PGA value of 0.33g scaled with factors ranging from 1 to 10. However, the model appears to be intact in every case which i believe to be a mistake given the value of these factors. The other excitations for which my model does not produce results have been similarly scaled. I also noticed that the relative displacements of the structure in the aforementioned cases are very low. I have reviewed both models in terms of: constraints, the application and import of the time histories, material strength, element connectivity and classes and checks performed. I have also tried increasing the convergence tolerance of the model and the relevant parameters outlined in the relevant section of the Seismostruct manual and increased the fibers in the used elements but unfortunately to no avail. Moreover, i tried performing a more simple DTH analysis to the entire model and to more simplified model (i.e just one pier with the acceleration loads applied at the fixed footing) with all my efforts being equally unfruitful.I would greatly appreciate your help and your quick response.
Kind Regards
Spyros Resvanis
I hope you are well! I am running an IDA analysis with Seismostruct for a bridge model and I am using the software's code-based checks for chord rotation and shear. I am applying a suite of ground motions and for many of them, it seems to produce results, while for others it doesn't. As an example I will note that I have applied an excitation of a peak PGA value of 0.33g scaled with factors ranging from 1 to 10. However, the model appears to be intact in every case which i believe to be a mistake given the value of these factors. The other excitations for which my model does not produce results have been similarly scaled. I also noticed that the relative displacements of the structure in the aforementioned cases are very low. I have reviewed both models in terms of: constraints, the application and import of the time histories, material strength, element connectivity and classes and checks performed. I have also tried increasing the convergence tolerance of the model and the relevant parameters outlined in the relevant section of the Seismostruct manual and increased the fibers in the used elements but unfortunately to no avail. Moreover, i tried performing a more simple DTH analysis to the entire model and to more simplified model (i.e just one pier with the acceleration loads applied at the fixed footing) with all my efforts being equally unfruitful.I would greatly appreciate your help and your quick response.
Kind Regards
Spyros Resvanis