Plane　irregular　buildings　are　prone　to　torsion　and　cause　serious　damage　to　the　structure.　The　analysis　and　control　of　structural　torsion　effect　is　the　key　to　this　kind　of　structural　design.　In　this　regard,　the　simulation　calculation　of　the　planar　irregular　multistory　frame　model　in　the　8-degree　fortification　zone　was　carried　out,　and　the　planar　L-type　four-story　frame　isolation　model　of　five　typical　class　B　buildings　was　established.　The　ratios　of　the　length　B　and　width　W　of　the　protruding　limbs　of　the　structure　were　set　to　be　1:1,　1.5:1,　2:1,　2.5:1　and　3:1,　respectively.　The　dynamic　characteristics　and　seismic　response　of　different　structures　were　analyzed.　The　influence　of　the　LRB　stiffness　ratio　and　the　rigid　center　position　of　the　isolation　layer　on　the　structural　torsion　was　discussed,　and　the　effective　control　method　of　structural　torsion　was　proposed.　The　results　show　that　with　the　increase　of　the　length-width　ratio　B/W　of　the　protruding　limb,　the　X-direction　torsion　of　the　structure　increases　gradually,　and　the　Y-direction　torsion　decreases　gradually.　Increasing　the　proportion　of　LRB　stiffness　can　reduce　the　torsional　effect　of　the　structure.　By　comprehensively　controlling　the　structural　torsion　and　structural　damping　coefficient,　a　reasonable　proportion　of　LRB　stiffness　can　be　obtained.　The　proportion　of　LRB　stiffness　of　the　isolation　layer　under　the　condition　of　8　degrees　earthquake　is　proposed.　At　the　same　time,　the　rigid　center　of　the　isolation　layer　and　the　rigid　center　of　the　superstructure　are　arranged　on　both　sides　of　the　mass　center　of　the　superstructure　to　suppress　the　torsion　of　the　superstructure　of　the　plane　irregular　structure.　©　2024　Nanjing　University　of　Aeronautics　an　Astronautics.　All　rights　reserved.