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(1 天津大學(xué)建筑設(shè)計規(guī)劃研究總院有限公司, 天津 300072; 2 天津大學(xué)建筑工程學(xué)院, 天津 300072;3 濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室 (天津大學(xué)), 天津 300072)
摘要: 以天津某項目長懸挑結(jié)構(gòu)樓蓋為對象,通過建立其整體有限元分析模型,對長懸挑結(jié)構(gòu)樓蓋的自振特性以及在不同人行荷載激勵下的振動響應(yīng)進(jìn)行了深入分析。 分析結(jié)果表明,長懸挑結(jié)構(gòu)樓蓋的懸挑長度大,豎向剛度較小,前兩階豎向自振頻率均小于 3Hz;低頻豎向振動處于人群荷載激勵頻率范圍內(nèi),樓蓋振動峰值加速度不滿足規(guī)范限值要求,需要進(jìn)行減振設(shè)計;布置調(diào)諧質(zhì)量阻尼器后,長懸挑結(jié)構(gòu)樓蓋在人群荷載激勵下的豎向加速度響應(yīng)顯著減小,減振率達(dá)到 72. 8%,減振后樓蓋舒適度可以滿足規(guī)范要求。
關(guān)鍵詞: 長懸挑結(jié)構(gòu); 振動舒適度; 人致激勵; 時程分析; 振動控制
中圖分類號:TU393. 3 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2022)24-0039-05
DOI:10. 19701 / j. jzjg. LS210315
Analysis on vibration comfort of long cantilevered structure floor
ZHANG Shaohua1,2, ZHANG Xizhi1,3, DING Yongjun1, YAN Xiangyu1, ZHU Lipeng1, LI Xingqian2
(1 Tianjin University Architectural Design & Urban Planning Research Institute Co. , Ltd. , Tianjin 300072, China;2 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3 Key Laboratory of Coast CivilStructure Safety of Ministry of Education (Tianjin University), Tianjin 300072, China)
Abstract:Taking a long cantilever structure floor in Tianjin as the object, the natural vibration characteristics of the longcantilever structure floor and its vibration response under different pedestrian loads are deeply analyzed by establishing itswhole finite element analysis model. The analysis results show that the cantilever length of the long cantilever structure flooris large, the vertical stiffness is small, and the vertical natural vibration frequencies of the first two orders are both less than3Hz. The low-frequency vertical vibration is within the frequency range of the crowd load excitation, and the vibration peakacceleration of the floor can not meet the specification limit requirements, and vibration damping design is required. Afterarranging the tuned mass dampers, the vertical acceleration response of the long cantilevered structure floor under the crowdload excitation is significantly reduced, and the vibration reduction rate reaches 72. 8%, and the comfort of the floor canmeet the requirements of the specification after reducing vibration.
Keywords: long cantilevered structure; vibration comfort; human-induced excitation; time-history analysis;vibration control
第一作者:章少華,博士,教授級高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事預(yù)制混凝土結(jié)構(gòu)及高層建筑抗震研究,Email:zshyz99@ 126. com。
[引用本文] 章少華,張錫治,丁永君,等. 長懸挑結(jié)構(gòu)樓蓋人致振動舒適度分析[J]. 建筑結(jié)構(gòu),2022,52(24):39-43,81. ZHANG Shaohua,ZHANG Xizhi,DING Yongjun,et al. Analysis on vibration comfort of long cantilevered structurefloor[J]. Building Structure,2022,52(24):39-43,81.
