Abstract:This study presents an integrated seismic isolation design methodology tailored for special fortification buildings, in compliance with the Standard for Seismic Isolation Design of Buildings. The approach was applied to a design project for a special fortification building situated in Kunming City. The structural design process was executed using the YJK software. Subsequently, 7 seismic motion time histories meeting specified criteria were selected, and dynamic elastic-plastic time history analysis of the structure were conducted under seismic fortification, rare, and extremely rare earthquake scenarios using the ETABS analysis platform. The inter-story displacement angle and floor horizontal acceleration under seismic fortification align with regulatory standards. During rare seismic events, the structure's inter-story displacement angle, floor horizontal acceleration, tensile and compressive stresses, and horizontal displacement of the isolated rubber bearings also conform to specifications. In the event of extremely rare earthquakes, the inter-story displacement angle and horizontal displacement of the isolated rubber bearings meet the prescribed requirements. The tensile and compressive stress limits of the isolated rubber bearings are maintained at 1 MPa and 20 MPa, respectively, indicative of a safety-focused approach. Results from the dynamic elastic-plastic time history analysis affirm that the isolation structure has effectively met the seismic fortification objectives by remaining intact during earthquakes, being repairable in rare seismic events, and averting collapse in extremely rare seismic circumstances.
