- 摘 要
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（中國建筑西南設(shè)計研究院有限公司， 成都 610042）
［摘要］某辦公樓建筑立面凱旋門造型采用大跨度連體結(jié)構(gòu)，跨度為43.5m。該連體豎向自振特性具有多階豎向自振頻率低、頻率分布密集、阻尼比小等特點，因人群活動引起的豎向振動加速度過大導(dǎo)致舒適度問題，設(shè)計采用TMD振動控制減小人致振動加速度從而改善結(jié)構(gòu)舒適度。根據(jù)本項目的實踐，總結(jié)了一套完整的大跨度連體結(jié)構(gòu)樓蓋舒適度TMD振動控制設(shè)計方法。根據(jù)結(jié)構(gòu)的模態(tài)形狀特點、人群的活動空間分布情況及舒適度驗算結(jié)果確定需要控制的頻率； 按等效單自由度體系確定對應(yīng)模態(tài)TMD最優(yōu)參數(shù)，并考慮多模態(tài)振動控制，可進一步將單個質(zhì)量較大的TMD分解為多個MTMD，以改善控制效果； 在分析模型相應(yīng)位置處加入TMD，采用快速非線性分析法（FNA法）進行時程分析以驗證TMD振動控制效果。計算結(jié)果表明：采用TMD控制結(jié)構(gòu)加速度可顯著改善大跨度樓蓋結(jié)構(gòu)的舒適性，是一種經(jīng)濟、實用的方法； 對于頻率密集型的大跨度樓蓋結(jié)構(gòu)，應(yīng)控制多模態(tài)的振動加速度。
［關(guān)鍵詞］大跨度連體結(jié)構(gòu)； 舒適度； TMD振動控制； 多模態(tài)振動控制
中圖分類號：TU318文獻標(biāo)識碼：A文章編號：1002-848X(2020)19-0112-05
Design of multi-modal TMD vibration control for a large-span conjoined structure
ZHOU Dingsong, DENG Kaiguo, ZHENG Ting, HUANG Wei
(China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610042, China)
Abstract:The Triumphal Arch shape of an office building adopts a large-span conjoined structure with a span of 43.5m. The vertical natural vibration characteristics of the conjoined structure have the characteristics of low multi-level vertical natural vibration frequency, dense frequency distribution, and small damping ratio. The excessive vertical vibration acceleration caused by crowd activities causes comfort problems. The design uses TMD vibration control to reduce human-induced vibration acceleration to improve structural comfort. According to the practice of this project, a complete set of TMD vibration control design method for comfort of large-span conjoined structure floor was summarized. The frequency that needs to be controlled was determined according to the characteristics of the modal shape of the structure, the spatial distribution of people′s activities and the results of the comfort degree. The optimal parameters of the corresponding modal TMD was determined according to the equivalent single degree of freedom system, and the multi-modal vibration control was considered. Further a single large mass TMD could be decomposed into multiple MTMD to improve the control effect. TMD was added at the corresponding position of the analysis model, and the fast nonlinear analysis method (FNA method) was used for time-history analysis to verify the TMD vibration control effect. The calculation results show that the use of TMD to control structural acceleration can significantly improve the comfort of large-span floor structures, and is an economical and practical method; for frequency-intensive large-span floor structures, multi-mode vibration acceleration should be controlled.
Keywords:largespan conjoined structure; comfort; TMD vibration control; multimodal vibration control
作者簡介：周定松，博士，一級注冊結(jié)構(gòu)工程師，教授級高級工程師，英國結(jié)構(gòu)工程師學(xué)會會員(MIStrucE)，Email: zhoudingsong@163.com； 通信作者：黃煒，碩士，高級工程師，Email：14763452@qq.com。
