Abstract
The present paper reports the results of acomprehensive study designed to verify the effectiveness of an advanced mathematical model in simulating the complex mechanical behaviour of a prototype seismic isolation system made of polymeric bearings (PBs). Firstly, in order to construct the seismic bearings considered in this research, a specially prepared flexible polymeric material with increased damping properties was employed. High effectiveness of PBs in reducing structural vibrations due to seismic excitations was already confirmed during a previously conducted shaking table investigation. In order to accurately capture the complex mechanical behaviour of PBs in numerical analysis, the proposed mathematical model defines the lateral force as a nonlinear function of shear displacement and deformation velocity. Function parameters were evaluated by fitting the general form of the mathematical model into the experimentally obtained hysteresis loops, using the least squares optimisation method. The effectiveness of the mathematical model was verified by comparing the experimental data (i.e., seismic response of a 1.20 m high single-storey and a 2.30 m high two-storey structure models under various ground motions) with the results obtained from the detailed numerical analysis, where the experimental models were idealized as multi-degree-of-freedom systems. The results obtained from this investigation explicitly confirmed that the proposed mathematical model can be successfully adopted to accurately capture complex mechanical behaviour of PBs in numerical studies.
Highlights
Introduction and MotivationEarthquake-induced ground motions are identified as one of the most unpredictable, and more importantly, destructive threats to civil engineering structures
Close inspection of Tables and confirm high effectiveness of the developed mathematical modelwhich in simulating complex demonstrates that the reduction levels in peak lateral accelerations, were calculated basedhysteretic on both numerical results and previously obtained dataClose, are veryofsimilar behaviour of the prototype base isolation systemexperimental made of polymeric bearings (PBs)
The paper reports the results of the comprehensive investigation designed to verify the effectiveness of an advanced mathematical model in simulating complex hysteretic behaviour of a prototype base isolation system made of PBs in numerical analysis
Summary
Earthquake-induced ground motions are identified as one of the most unpredictable, and more importantly, destructive threats to civil engineering structures. (4) Implement the proposed mathematical model the computational analysis order to and with dynamic characteristics typical for low-rise andinto medium-rise buildings, bothin fixed-base perform numerical evaluation of the seismic response of the previously examined experimental base-isolated with the use of PBs, to a number of different ground motions and a mining tremor. Models with dynamic characteristics typical for low-rise and medium-rise buildings, both fixedVerifybase the effectiveness of the proposed modelofindifferent simulating nonlinear behaviour of and base-isolated with the use mathematical of PBs, to a number ground motions and a PBs bymining comparing the results of the detailed lumped-parameter analysis with the experimentally tremor. (5) Verify the effectiveness obtained shaking table data. of the proposed mathematical model in simulating nonlinear behaviour of PBs by comparing the results of the detailed lumped-parameter analysis with the experimentally
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