INVESTIGATION OF NUMERICAL MODELING OF BUILDINGS WITH DRY-FRICTION SEISMIC ISOLATION
Keywords:
seismic isolation, dry friction, flat sliding bearing, two-mass model, Newmark method, hysteresis, energy dissipation, time step.Abstract
A two-mass model of a building with dry-friction seismic isolation is investigated. A flat sliding bearing acts in parallel with a restoring spring, while friction is represented by an elastic–perfectly plastic element with finite initial stiffness. Calculations were performed in Python using the Newmark method. The isolated and fixed-base models were compared under synthetic ground acceleration. For the selected parameters, peak superstructure deformation and absolute acceleration decreased by 80.33% and 80.27%, respectively; peak platform displacement reached 54.12 mm. Differences in the main peak responses remained below 0.05% upon time-step refinement. Residual displacement was sensitive to initial stiffness. These findings are limited to the synthetic excitation and require further assessment using recorded ground motions and experimental data.
References
Flat Slider Bearing Element // OpenSees Wiki. – URL: https://opensees.berkeley.edu/wiki/index.php/Flat_Slider_Bearing_Element (murojaat sanasi: 08.10.2026).
Single Friction Pendulum Bearing Element // OpenSees Documentation. – URL: https://opensees.github.io/OpenSeesDocumentation/user/manual/model/elements/SingleFrictionPendulumBearing.html (murojaat sanasi: 08.10.2026).
FPBearingPTV Element // OpenSees Wiki. – URL: https://opensees.berkeley.edu/wiki/index.php/FPBearingPTV (murojaat sanasi: 08.10.2026).
Mosqueda G., Whittaker A. S., Fenves G. L. Characterization and Modeling of Friction Pendulum Bearings Subjected to Multiple Components of Excitation // Journal of Structural Engineering. – 2004. – Vol. 130, No. 3. – P. 433–442. – DOI: 10.1061/(ASCE)0733-9445(2004)130:3(433).
Mokha A., Constantinou M., Reinhorn A. Teflon Bearings in Base Isolation I: Testing // Journal of Structural Engineering. – 1990. – Vol. 116, No. 2. – P. 438–454. – DOI: 10.1061/(ASCE)0733-9445(1990)116:2(438).
Constantinou M., Mokha A., Reinhorn A. Teflon Bearings in Base Isolation II: Modeling // Journal of Structural Engineering. – 1990. – Vol. 116, No. 2. – P. 455–474. – DOI: 10.1061/(ASCE)0733-9445(1990)116:2(455).
Kumar M., Whittaker A. S., Constantinou M. C. Characterizing Friction in Sliding Isolation Bearings // Earthquake Engineering & Structural Dynamics. – 2015. – Vol. 44, No. 9. – P. 1409–1425. – DOI: 10.1002/eqe.2524.
Drazin P. L., Govindjee S. A Nonlinear Kinetic Model for Multi-Stage Friction Pendulum Systems: PEER Report 2017/07. – Berkeley: Pacific Earthquake Engineering Research Center, University of California, 2017. – URL: https://peer.berkeley.edu/publications/2017-07 (murojaat sanasi: 08.10.2026).
Coulomb Friction // OpenSees Wiki. – URL: https://opensees.berkeley.edu/wiki/index.php/Coulomb_Friction (murojaat sanasi: 08.10.2026).
Newmark Method // OpenSees Wiki. – URL: https://opensees.berkeley.edu/wiki/index.php/Newmark_Method (murojaat sanasi: 08.10.2026).
