Damping Effect of Story Isolation Structure Considering Different Positions of Isolation Layer

摘要

The multi-mass analysis models of story isolation and general structure are established, major parameters are optimized on story isolation structure, with time-history analysis for isolation layers in different position, the contributions of modes and damping effects of absolute acceleration and story drift about story-isolation structure are analysed. Result indicates that after the parametric optimization, the natural period of story-isolation structure is longer than that of general structure; no matter where the position of isolation layer is, the damping effects are always obviously; the position of isolation layer has direct influence on the damping effect, damping effect gradually reduce when the isolation layer raised, and the contributions of high modes to dynamic responses increase; it's worth noting that infrastructure absolute acceleration magnify to some extent compared with general structure.