長懸挑結(jié)構(gòu)樓蓋振動(dòng)舒適度分析與控制
陸道淵，黃良，江蓓，金健
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（華東建筑設(shè)計(jì)研究院有限公司, 上海 200002）
［摘要］長懸挑結(jié)構(gòu)豎向剛度較弱，懸挑區(qū)域樓蓋在人群荷載激勵(lì)下易發(fā)生較大振動(dòng)。以北京某一懸挑長度約為24m的長懸挑商務(wù)樓為工程背景，利用SAP2000軟件對結(jié)構(gòu)整體建模并考察其自振特性，對懸挑處樓蓋進(jìn)行了不同工況下的舒適度計(jì)算。分析表明，當(dāng)上下樓層同時(shí)存在人行激勵(lì)時(shí)，樓蓋豎向最大加速度為0.208m/s2，超過舒適度限值；優(yōu)化布置的多調(diào)諧質(zhì)量阻尼器（MTMD）系統(tǒng)減振效果明顯，減振率達(dá)35%，采用MTMD系統(tǒng)的樓蓋舒適度滿足要求。［關(guān)鍵詞］長懸挑結(jié)構(gòu); 人群荷載; 舒適度; 調(diào)諧質(zhì)量阻尼器中圖分類號：TU352, TU391 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號：1002-848X(2015)19-0013-05
Vibration comfort analysis and control of long cantilever structure floorsLu Daoyuan, Huang Liang, Jiang Bei, Jin Jian(East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China)Abstract: Long cantilever structure has an instinct weakness in vertical stiffness, and the floors in cantilever area are prone to large vibration under crowdinduced load excitation. Based on a long cantilever business building with the cantilever length of about 24m in Beijing as the engineering background, SAP2000 software was used to carry out overall modeling of the structure and the self-vibration characteristics were studied. And the comfort calculation on the cantilever floor was conducted under different working conditions. Analyses show that when the crowd-induced excitations exist on the upper and lower floors at the same time, the maximum vertical acceleration for the floor is 0.208m/s2, which exceeds the comfort limits. Optimal arranged Multiple Tuned Mass Dampers (MTMD) system has obvious damping effect with damping rate of 35%. The floor comfort meets the requirements when the MTMD system is adopted.Keywords: long cantilever structure; crowd-induced load; comfort; Tuned Mass Damper(TMD)作者簡介：陸道淵，教授級高級工程師，Email：daoyuan_lu@ecadi.com。
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