WANG Haoting,GE Nan,HAN Liutao,et al.Research on Seismic Isolation Efficiency of FPS Bearing under Multi‑point Excitation of Earthquake Waves Based on Displacement‑velocity Input Method[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(01):165-174.
WANG Haoting,GE Nan,HAN Liutao,et al.Research on Seismic Isolation Efficiency of FPS Bearing under Multi‑point Excitation of Earthquake Waves Based on Displacement‑velocity Input Method[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(01):165-174. DOI: 10.13409/j.cnki.jdpme.20220505005.
Research on Seismic Isolation Efficiency of FPS Bearing under Multi‑point Excitation of Earthquake Waves Based on Displacement‑velocity Input Method
Under the influence of the traveling wave effect, coherence effect and site effect, the seismic response analysis of long-span structures under multi-point excitation is very complex, and considering the influence of multi-point excitation on the isolation performance of long-span spatial grid structures is a significant research topic in seismic engineering. An analytical seismic dynamic model under multi-point excitation was presented using SAP2000 finite element software and displacement input method for a single-layer cylindrical lattice shell large-span structure. The seismic dynamic response for consistent excitation and multi-point excitation were executed respectively. Results show that the multi-point excitation effect could exert a notable influence on the seismic dynamic response of spatial large-span structures, and the use of multi-point excitation is necessary. When the seismic isolation is absent, the column moment and shear force increase significantly, displacement of column top decreases and the axial force in the middle column increases slightly with the decrease of seismic wave velocity. When the base isolations are considered, the mitigation efficiency is in the range of 45% to 75% for column moments and is maintained between 60% and 85% for column shear forces. The distribution of column inner forces and displacement is different from that without seismic isolation. The inner forces of side columns are all smaller than those of central columns while the relative displacement at the top of the columns increases obviously. When column top isolations are installed, higher seismic isolation efficiency can be expected, with a column moment damping efficiency of about 90% and a column shear force damping efficiency between 85% and 90%. The displacement at the top of the column notably decreases and the column axial forces slightly decline.
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