Translated Title

Research on mechanism of torsional effect and limits of critical parameters of asymmetric base-isolated structures

Translated Abstract

Compared　with　traditional　seismic　structures,it　is　easier　to　control　the　critical　parameters　in　a　reasonable　range　by　adjusting　the　layout　of　isolators,so　as　to　reduce　the　adverse　impact　caused　by　superstructure　eccentricities.Therefore,from　the　perspective　of　the　torsional　mechanism　of　asymmetric　base-isolated　structures,the　influence　law　and　degree　of　the　torsional　to　lateral　frequency　ratio　of　base-isolated　structures　and　the　eccentricity　in　the　isolation　system　on　the　torsional　effect　in　different　value　ranges　were　analyzed.Results　show　that,the　smaller　the　torsional　to　lateral　frequency　ratio　is,the　more　obvious　the　torsional　response　is,and　the　small　eccentricity　in　the　isolation　system　will　aggravate　the　torsional　response.Torsional　response　is　weakened　when　the　torsional　to　lateral　frequency　ratio　is　greater　than　1.2,and　the　eccentricity　in　the　isolation　system　is　close　to　a　positive　correlation　with　torsional　response.Then,the　explicit　limit　displacement　ratio　of　the　furthest　isolator　from　the　center　of　mass　with　or　without　eccentricity　was　derived　under　the　condition　that　the　displacement　of　isolator　did　not　exceed　the　allowable　value.The　results　of　analysis　indicate　that　there　is　a　maximum　isolation　period　to　make　the　limit　value　obtain　a　minimum　value.According　to　this,the　limit　value　of　the　eccentricity　under　different　torsional　to　lateral　frequency　ratios　can　be　obtained,and　the　torsional　response　can　be　controlled　within　the　limit　range　effectively,which　provides　effective　references　for　designers　in　torsional　design　of　asymmetric　base-isolated　structures.

Translated Keyword

base isolation
eccentricity in the isolation system
limits of critical parameters
mechanism analysis
torsional effect
torsional to lateral frequency ratio

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Type

Project Name

Project No.

Access Number

WF:perioarticalzdycj202324005

Language

Chinese

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