884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（華南理工大學(xué)土木與交通學(xué)院， 廣州 510640）

［摘要］在通過(guò)足尺靜力試驗(yàn)校核MIDAS Civil有限元模型的基礎(chǔ)上，對(duì)一座輕鋼人行橋進(jìn)行動(dòng)力特性分析，并采用規(guī)范ISO 10137∶2007(E)提出的單人行走荷載模型，結(jié)合用同步行走人群代替隨機(jī)行走人群的方法，計(jì)算不同工況下結(jié)構(gòu)峰值加速度響應(yīng)。此外，考慮人群質(zhì)量對(duì)人橋系統(tǒng)總基頻的影響，將人群質(zhì)量逐級(jí)折算入人橋系統(tǒng)總質(zhì)量，分析人群行走工況下的結(jié)構(gòu)加速度響應(yīng)。研究認(rèn)為，該橋滿足現(xiàn)有規(guī)范對(duì)于基頻的要求，同時(shí)峰值加速度基本處于德國(guó)規(guī)范EN 03規(guī)定的舒適區(qū)間，但折算78%滿載人群質(zhì)量計(jì)算人橋系統(tǒng)基頻時(shí)，峰值加速度相比不折算人群質(zhì)量的情況明顯增大，表明人群質(zhì)量可以對(duì)系統(tǒng)基頻產(chǎn)生顯著影響，可能造成人橋系統(tǒng)基頻落入行人步頻范圍內(nèi)，導(dǎo)致人橋共振現(xiàn)象的發(fā)生。

［關(guān)鍵詞］輕鋼人行橋；靜力加載試驗(yàn)；加速度響應(yīng)；人行舒適度；人群荷載模型

中圖分類號(hào)：TU392-5文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)04-0131-05

Mechanical characteristic research and comfort evaluation of a light-weight steel footbridge

XU Jing, LI Zeyu, LI Jing, CHEN Xijun

(School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China)

Abstract:Based on the MIDAS Civil finite element model calibrated by full scale static test, the dynamic characteristics of a light-weight steel footbridge were analyzed, and the peak acceleration response of the structure under different working conditions was calculated using the single-person walking load model proposed by the code ISO 10137∶2007(E) and combining the method of replacing the random walking crowd with the synchronized walking crowd. In addition, considering the effect of the crowd mass on the natural frequency of the structural system (including the crowd and the footbridge), the crowd mass was converted into the total mass of the system step by step, and the structural acceleration response under crowd walking conditions was analyzed. The study concludes that the bridge meets the requirements of the existing code for the natural frequency and the peak acceleration is basically in the comfort zone specified in the German code EN 03. However, when the natural frequency of the system is calculated by introducing 78% of the full crowd mass, the peak acceleration is significantly higher compared to the case without considering the crowd mass, which indicates that the crowd mass may have a significant impact on the system natural frequency, and it is possible for the system natural frequency falls into the pedestrian step frequency range and leads to the resonance phenomenon.

Keywords:light-weight steel footbridge;static loading test;acceleration response;pedestrian comfort;crowd load model

*建筑——結(jié)構(gòu)限制中的自由（2020A1414010101）。

作者簡(jiǎn)介：許競(jìng)，碩士研究生，Email: ctjingxu@mail.scut.edu.cn；通信作者：李靜，博士，副教授，Email: cvjingli@scut.edu.cn。