We are analyzing seismic isolated structure for accelerogram loading using time-history step analysis and have some questions about that:
- Which options for Sofiload ACCE should be used to apply accelerations only on foundation nodes (unisolated part of structure), instead of all nodes of the model?
- Is it possible to model sliding isolation pendulum devices (Maurer SIP) by Spring Elements? The main equation for lateral force is F=W/R∙D ± μW, so force F depends on both axial load W and displacement D. We haven’t found this option in Sofimsha SPRI documentation.
- What is preferable Ase STEP options and iteration method to reach convergence of nonlinear time-history analysis for earthquake, having sliding isolation pendulum, dampers and friction springs?