屋顶钢塔TMD和塔底隔震双重减震性能研究

Double Earthquake Resistant Control Research of Shock Isolation of Building Roof Steel Tower Bottom and Tower as TMD

本文利用有限元软件SAP2000建立了某四层钢框架模型,对其未设置屋顶钢塔、仅设置屋顶钢塔及设置屋顶钢塔和TMD三种模型进行了不同地震波下的时程分析和比较。结果表明,未设置屋顶钢塔时,主体结构在地震作用下反应最强烈;仅设置屋顶钢塔时主体结构反应相对较弱,钢塔在鞭梢效应下反应最为强烈;设置屋顶钢塔和TMD时主体与钢塔结构的反应同时达到最弱。研究表明屋顶钢塔和TMD能够同时有效的减小主体结构与屋顶钢塔的地震反应,避免了屋顶钢塔的鞭梢效应,达到了较好的减震效果。

In this paper, one four-floor steel frame mode was built by huge general use finite element software SAP 2000. Under the different earthquake waves had time history analysis and comparison with three modes： the mode without steel tower atop building, the mode only with the steel tower atop building and with a TMD system of the steel tower atop building. The analysis results show： under the condition of without steel tower atop building, the main structure has the most obvious response; under the condition of steel tower atop building the response is relatively weak and the steel tower atop building has the most great reaction under the whiplash effect; while with the TMD of the steel tower atop building, the reaction of the main structure and steel tower decline to their lowest point.The research suggests that the TMD of the steel tower on the top of the building can reduce the earthquake response of main structure and steel tower effectively, and simultaneously, avoid the whiplash effect and get a better damping shake effect.