某位移比超限偏心结构地震响应及阻尼器控制分析

利用SAP 2000有限元软件,以某实际偏心结构为工程背景,对使用粘滞阻尼器、粘弹性阻尼器、软钢阻尼器和复合铅粘弹性阻尼器控制位移比超限的偏心结构进行了模态分析、反应谱分析和时程分析,比较了各类减震结构在地震作用下的周期比、位移比和阻尼器内力。结果表明:设置阻尼器后,结构位移比减小;阻尼器宜布置在偏心结构水平刚度相对较小、结构侧移较大的一端;粘弹性阻尼器、软钢阻尼器和复合铅粘弹性阻尼器通过提供侧向刚度和阻尼来调节偏心结构扭转效应;粘滞阻尼器通过增加结构阻尼比可起到减小结构位移比的作用。此外,粘滞阻尼器和粘弹性阻尼器在小震下能够起到良好的消能效果,软钢阻尼器和铅粘弹性阻尼器在小震情况下基本上处于弹性状态,仅提供刚度,在大震下阻尼器也具有良好的耗能能力和减震效果。

Earthquake Response of a Displacement Ratio Overrun Eccentric Structure and Control Analysis Using Dampers

This paper research the earthquake response control effect of the displacement ratio overrun asymmetric structures by using viscous damper,viscoelastic damper, metal damper,lead-viscoelastic compound damper and brace.In this article,a practical project is used as analysis background.The model anlaysis,response spectrum analysis and time history analysis are proceeded for the structure with 4 different kinds of damper.The period ratio and displacement ratio are contrasted in the paper.Results show that after install the viscous-elastic damper,lead-viscoelastic compound damper and metal damper into the structure,the displacement ratio is reduced largly.The damper should be located at the end,where the lateral stiffness is weak and the displacement is large.Viscoelastic damper,metal damper and lead-viscoelastic compound damper adjust the torsional effect by supplying the asymmetric structure lateral stiffness and damping,while viscous damper increasing the damping ratio.Moreover,the viscous damper and viscouelastic damper have exellent energy dissipative abillity even under light earthquake,however,metal damper and lead-viscoelastic compound damper are basically in elastic state while only supply stiffness.It have great dissipative ability under rare earthquake.