交通荷載作用下鋼彈簧浮置板隔振道路設計參數研究

鄒錦華 李碧坤 陳偉 陳海斌 黃龍田 鄒超

摘要：為降低城區道路汽車荷載對建筑結構的振動影響，設計一種新型鋼彈簧浮置板隔振道路，對浮置板的動力學設計參數進行研究。在浮置板縮尺模型有限元試驗驗證的基礎上，選取浮置板長度、厚度、彈簧剛度、彈簧支承間距4個參數及不同水平值，進行正交試驗，建立81個樣本的三維有限元模型。采用模態分析法，研究各參數對浮置板固有頻率和振型的影響;實測交通荷載激勵，分析激勵作用下浮置板結構在時域和頻域的響應，并通過Z振級和插入損失探討浮置板結構各參數的減振效果。結果表明：各樣本基頻主要分布在4～10 Hz之間，基頻直接影響鋼彈簧浮置板的隔振性能;隨著浮置板長度的減小、厚度的增大、彈簧剛度的減小、支承間距的增大，浮置板結構的隔振效果明顯提高;交通荷載激勵下，浮置板結構振動放大頻段位于基頻附近及14～18 Hz范圍;VLz振級在0～18 Hz范圍內隨頻率增大而增大，之后隨頻率增大而降低，但未超過72 dB;對于0～40 Hz范圍內的振動響應，樣本最大減振量為40.6 dB，基頻處放大量最大為17.4 dB。

關鍵詞：交通荷載;鋼彈簧浮置板道路;模態分析;振級;插入損失;設計參數

中圖分類號：U416.0 文獻標志碼：A 文章編號：20966717（2020）04012411

收稿日期：20190823

基金項目：廣東省科技計劃（2015B090901054）;廣東省交通運輸廳科技項目（科技201702013）

作者簡介：鄒錦華（1975 ），男，副教授，博士，主要從事結構、橋梁和隧道振動與控制研究. Email： zoujinhua@gdut.edu.cn。

Received：20190823

Foundation items：Science and Technology Project of Guangdong Province （No.2015B090901054）; Science and Technology Project of Department of Transportation of Guangdong Province （No. 201702013）

Author brief：Zou Jinhua （1975）， associate professor， PhD， main research interests： vibration and control of structure， bridge and tunnel， Email： zoujinhua@gdut.edu.cn.

Design parameters study of vibration isolation road of steel spring floating slab under traffic load

Zou Jinhua1， Li Bikun1， Chen Wei2， Chen Haibin2， Huang Longtian2， Zou Chao1

（1.School of Civil and Transportation Engineering， Guangdong University of Technology， Guangzhou 510006， P.R. China;2.Architectural Design and Research Institute of Guangdong Province， Guangzhou 510010， P.R. China）

Abstract： In order to reduce the influence of vehicle loads on the vibration of building structure， a new type of steel spring floating slab vibration isolation road was designed， and the dynamic design parameters of floating slab were studied. On the basis of finite element test verification of the scale model of floating slab， four parameters were selected and orthogonal tested， including length and thickness of floating slab， spring stiffness and support spacing. Total of 81 cases of corresponding 3D finite elements were established. The modal analysis method was used to study the influence of various parameters on the natural frequency and vibration mode of the floating slab. The traffic load excitation was measured， and the response of the floating slab structure in the time domain and the frequency domain was analyzed， and the vibration damping effect of each parameter of floating slab structure is discussed by Z vibration level and insertion loss. The results show that the fundamental frequency of each sample is mainly distributed between 4 Hz and 10 Hz. The fundamental frequency directly affects the vibration isolation performance of the steel spring floating slab. With the decrease of the length， the increase of the thickness， the decrease of the stiffness of the spring and the increase of the spacing of the supports， the isolation effect of the floating slab structure is obviously improved. The vibration amplification frequency band of the floating slab structure is located near the fundamental frequency and in the range of 14～18.0 Hz under the traffic load excitation. The VLz vibration level increases with increasing frequency in the range of 0～18 Hz， and then decreases with increasing frequency， but does not exceed 72 dB. For the vibration response within the range of 0～40 Hz， the maximum amount of vibration reduction in all samples is 40.6 dB， and the maximum amount of emission at the fundamental frequency is 17.4 dB.

Keywords：traffic load; steel spring floating slab road; modal analysis; vibration level; insertion loss; design parameters

城市道路交通發展帶來的振動和噪聲問題，對沿線居民和臨近建筑等造成很大的影響，成為社會關注的焦點?！?br>