- 摘 要
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（1 蘇州科技大學(xué)江蘇省結(jié)構(gòu)工程重點實驗室， 蘇州 215011；2 中衡設(shè)計股份集團(tuán)有限公司， 蘇州 215021； 3 東南大學(xué)土木工程學(xué)院， 南京 210096）
［摘要］大跨鋼結(jié)構(gòu)連廊質(zhì)量小、結(jié)構(gòu)柔、阻尼低，其動力特性及響應(yīng)易受行人影響，為此圍繞人-結(jié)構(gòu)耦合作用對大跨鋼連廊振動舒適度的影響開展研究。首先，引入兩類單自由度人體動力模型，建立人-結(jié)構(gòu)耦合動力模型，并確定人體模型關(guān)鍵參數(shù)。隨后，基于課題組前期獲取的諧波參數(shù)，模擬了單人步行荷載，進(jìn)一步結(jié)合人群密度和步頻關(guān)系，對大跨鋼連廊的人群荷載進(jìn)行了模擬。最后，以蘇州文博中心觀光連廊為例，對比分析了人-結(jié)構(gòu)耦合作用對大跨鋼連廊結(jié)構(gòu)動力特性和振動響應(yīng)的影響。結(jié)果表明，在考慮人-結(jié)構(gòu)耦合作用后，結(jié)構(gòu)的峰值加速度有一定程度減小，最大可達(dá)22.51%；人群的步行頻率與結(jié)構(gòu)的第1階豎向自振頻率接近或成倍頻關(guān)系時易產(chǎn)生共振響應(yīng)；人群密度的不同將影響行人步頻，從而會導(dǎo)致對人-結(jié)構(gòu)耦合作用效果的影響。
［關(guān)鍵詞］大跨鋼連廊；振動舒適度；人-結(jié)構(gòu)耦合作用；人群荷載；動力特性；振動響應(yīng)
中圖分類號：TU393-3文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)08-0043-07
Vibration comfort analysis of an indoor large-span steel corridor considering human-structure coupling
GUAN Jingcheng1, TAN Lihua2, CHEN Xin1, ZHANG Zhiqiang3, CHANG Han2
（1 Jiangsu Province Key Laboratory of Structure Engineering， Suzhou University of Science and Technology，Suzhou 215011， China；2 ARTS Group Co., Ltd., Suzhou 215021, China; 3 School of Civil Engineering, Southeast University, Nanjing 210096, China）
Abstract:The dynamic characteristics and responses of long-span steel corridors are susceptible to pedestrians because of their small mass, flexibility and low damping. Therefore, analysis focuses on the influence of human-structure coupling on the vibration comfort of large-span corridors was carried out. Firstly, two types of single-degree-of-freedom human body dynamic models were introduced to establish the human-structure coupling dynamic model, and the critical parameters of the human body models were also determined. Subsequently, based on the harmonic parameters measured by the author′s research group in the early stage, the single pedestrian load was simulated, and then the crowd load of the large-span steel corridor was reproduced by introducing the relationship between the crowd density and the step frequency. Finally, taking the sightseeing corridor of Suzhou Culture and Expo Center as a case, the effects of human-structure coupling on the dynamic characteristics and vibration response of the large-span steel corridor were compared and analyzed. The results show that by introducing the human-structure coupling effect, the peak acceleration of the structure decreases with a maximum ratio of 22.51 %. When the walking frequency of the crowd is close to or multiplied by the first vertical vibration frequency of the structure, the resonance response will occur. The crow density will affect pedestrian frequency, and this will change the human-structure coupling effect.
Keywords:large-span steel corridor;vibration comfort;human-structure coupling;crowd load;dynamic characteristics;vibration response
通信作者：談麗華，碩士，研究員級高級工程師，Email：tanlihua@artsgroup.cn。
