Research on ground vibration attenuation under multi-point non-uniform excitation of subway viaduct
HUA Yumeng1，LIN Weining2，XIE Weiping1，CHEN Bin3
(1. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan，Hubei 430070，China；2. Jinhua Rail Transit Group Co.，Ltd.，Jinhua，Zhejiang 321000，China；3. School of Civil and Transportation Engineering，Ningbo University of Technology，Ningbo，Zhejiang 315211，China)
Abstract：The purpose of this paper is to study the multi-point non-uniform excitation effect of subway viaducts and the laws of ground vibration attenuation. Based on the elastic semi-infinite space theory，a semi-analytical solution of the vertical acceleration of the soil surface under the action of multi-point non-uniform excitation is established. By testing the environmental vibration of a subway viaduct on a soft foundation，the accuracy of the theoretical model was verified by comparison. Study the influence of multi-point excitation and time delay effect，and analyze the law of vibration attenuation. Research indicates that the ground vibration around the viaduct attenuates rapidly with distance in the early stage and slowly at the later stage，and the main frequency distribution range is 60–100 Hz；It is necessary to consider multiple non-uniform excitations in the calculation，and 4–5 bridge piers can meet the calculation accuracy；The load amplitude has little effect on the vibration attenuation law，but the frequency has an impact；the vibration attenuation in the middle of the bridge span is slower than that at the pier，and the outside of the curve section is slower than the inside. The research results have guiding significance for the calculation，analysis，testing and evaluation of subway environmental vibration.
2021, Vol. 40 
