Analysis of local amplification of masonry structure vibration caused by rail transit
LI Zheng1, JIN Hao2, ZHENG Jun3
1.The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, Shanghai 201804, China；
2.School of Transportation Southeast University, Nanjing 211189, China;
3.Nanjing Metro Group Co., Ltd., Nanjing 210018, China
Abstract：With rapid development of rail transit industry, effects of rail transit on vibration of masonry structures along rail line is more and more significant, and there is a phenomenon of local vibration amplification. Here, through establishing vehicle-track-tunnel-stratum-masonry structure coupled dynamic model, combined with masonry structure’s modal analysis, the masonry structure with 1-6 floors near a certain metro line was analyzed. The results showed that ① when B-type train is adopted and its running speed is 60 km/h, the masonry structure of lower floors (1-2 floors) along the line is less affected by metro operation, the masonry structure of higher floors (3-6 floors) has vibration response amplification phenomenon; when the total floors of masonry structure are 3-6, the horizontal vibration acceleration reaches the maximum value at the 2nd floor and the minimum value at the 1st floor; ② from the modal analysis results of masonry structure, vibration response amplification may occur at 2-6 floors, the frequency range of vibration response amplification occurring at different floors is 23-46 Hz, and vibration response amplification at the 1st floor of the structure is not obvious; ③ vibration frequencies of masonry structure having vibration response amplification phenomenon are basically the same as natural frequencies of the structure, and under these frequencies, the floor where its response amplification phenomenon induced by train excitation occurring is basically consistent to the floor where its modal vibration maximum value occurring, so the train load induces natural modal vibration of masonry structure to cause vibration response amplification phenomenon.
李政，金浩，郑军. 轨道交通引起沿线砌体结构振动局部放大分析[J]. 振动与冲击, 2021, 40(15): 263-270.
LI Zheng, JIN Hao, ZHENG Jun. Analysis of local amplification of masonry structure vibration caused by rail transit. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 263-270.
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