站城综合体上部建筑的车致振动特征研究OA北大核心

In the station-city integrated comprehensive transportation hub project,upper commercial complex is characterized by centralized development around rail transit stations or track lines,which makes the project face complex environmental vibration problems during operation.However,there is a lack of relevant research at present.Taking Beijing Sub-Central Station Comprehensive Transportation Hub as an example and combined with the planning scheme of the centralized development plot in the project,a refined comprehensive transportation hub environmental vibration prediction model is established to study the vibration response of the upper buildings of the station-city complex under the action of train loads.The outdoor ground vibration and indoor floor vibration under the conditions of ordinary track and rubber mat floating slab track are statistically analyzed.The research results show that:(1)The vehicle induced environmental vibration of complex large-scale buildings shows obvious dispersion in spatial distribution and it is necessary to supplement the probability of reaching the standard of vibration response as the secondary evaluation index;(2)Due to the co-construction of the space structure of the above-ground complex and the underground hub,the vehicle-induced vibration has not been effectively attenuated by the soil,and finally the environmental vibration problems of the underground integrated transportation hub are mainly concentrated in the upper platform area,which exceeds the specified limit value about 5 dB;(3)By laying the rubber mat floating slab track with a stiffness of 0.011 N/mm3,the environmental vibration response can be effectively reduced by more than 10 dB,and the probability of environmental vibration reaching the standard within the hub can be ensured to reach more than 97% .