The mechanism of temperature-induced initial displacement of isolation bearing is deduced. Based on structural responses and environmental loads recorded by Structural Health Monitoring System (SHMS) of a Long irregular Base-Isolated Structure (LBIS), the dependency relationships of initial displacement of isolation bearings on temperature are investigated respectively. Furthermore, the dependency models are proposed. Finally, the dynamic responses of LBIS subjected to strong seismic action are analyzed with the consideration of the temperature effect and initial displacement of isolation bearings simultaneously. Results reveal that environmental temperature and initial displacement have significant effect on the dynamic responses of BIS. As decrease of environmental temperature and increase of initial displacement of isolation bearing, though the peak value of isolation bearing displacement shows decrease comparatively, the dynamic responses of superstructure become larger obviously. The performance of LBIS degrades remarkably without dissipating seismic energy efficiently.
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