Latest issueDynamics of the Object of Polygon of Seismic Isolation: Building with Supports on Fluoroplastic Gaskets
Authors:
Ph.D.in Engineering Science, Director of the Center for Scientific Research of the Construction Industry, Corresponding Member of the NIA of Kazakhstan and IEA, KazRDICA JSC, Almaty, Republic of Kazakhstan
Vladimir A. Lapin
Yerzhanov S.Е.
Ph.D. in Engineering Science, Adviser to Director General for Science, Corresponding Member of NEA RK and IEA,KazNIISA JSC, Republik of Kazakhstan, Almaty
Rubric: Seismic safety and seismic isolation of buildings
Key words: seismic isolation, vibration tests, accelerogram, safety, PTFE elements.
Annotation:
To study the seismic insulating properties of buildings in Almaty there is a special polygon. It includes buildings with conventional strip foundations with a system of cross-belts, seismic kinematic and supports with PTFE gaskets. The buildings are equipped with stations of engineering and seismometric service (seismic stations 20,21,22). The results of experimental studies of the house on fluoroplastic gaskets, performed in the late 80s, are analyzed. The results are compared with the instrumental records of the earthquakes of May 31, 2012 and August 16, 2014. The period of maximum spectrum coincides with the resonance in the initial stages of vibration tests-0.44-0.47 seconds. Using a single-mass calculation scheme taking into account the presence of dry friction forces, the dynamic model of the building was calculated for the impact of an unsteady random process. The median acceleration values at the base correspond to the “Seismic Zoning Map of the Republic of Kazakhstan” for earthquakes with a frequency of 475 years and 2475 years. Probabilistic estimates of displacement values at the support level are obtained.