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RISS 인기검색어
- 검색키워드
- 저자 : Qinglie He (검색결과 3 건)
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Qinglie He,Yun Yang,Chengbiao Cai,Shengyang Zhu 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.1
This work elaborately investigates the influences of the guideway geometry parameters and track irregularity on the dynamic performances of the suspended monorail vehicle-guideway system (SMVGS). Firstly, a spatial dynamic analysis model of the SMVGS is established by adopting ANSYS parameter design language. Then, the dynamic interaction between a vehicle with maximum design load and guideway is investigated by numerical simulation and field tests, revealing the vehicle-guideway dynamic features. Subsequently, the influences of the guideway geometry parameters and track irregularity on the dynamic performances of the SMVGS are analyzed and discussed in detail, and the reasonable ranges of several key geometry parameters of the guideway are also obtained. Results show that the vehicle-guideway dynamic responses change nonlinearly with an increase of the guideway span, and especially the guideway dynamic performances can be effectively improved by reducing the guideway span; based on a comprehensive consideration of all performance indices of the SMVGS, the deflectionspan ratio of the suspended monorail guideway is finally recommended to be 1/1054~1/868. The train load could cause a large bending deformation of the pier, which would intensify the car-body lateral displacement and decrease the vehicle riding comfort; to well limit the bending deformation of the pier, its cross-section dimension is suggested to be more than 0.8 m×0.8 m. The addition of the track irregularity amplitude has small influences on the displacements and stress of the guideway; however, it would significantly increase the vehicle-guideway vibrations and rate of load reduction of the driving tyre.
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Assessment and Control of Metro-induced Vibration and Secondary Noise of TOD Buildings
Defeng Zeng,Zhaowei Chen,Qinglie He 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
Metro-induced vibration and structural secondary noise are becoming increasingly outstanding, which greatly restrict the further development of TOD (Transit-oriented development) project. To solve this problem, an evaluation methodology and dynamic model of vibration and secondary noise induced by metro train is developed firstly. Then the characteristic and distribution of vibration and secondary noise of the TOD subject to running train are studied. Finally, the control effect of steel-spring floating slab track (FST) on vibration and secondary noise of TOD project is evaluated. Results show that: when evaluating environmental problem caused by metro train, the standard of secondary noise is more strict than that of vibration. Main frequency of metro-induced vibration is concentrated in 40 − 63 Hz, and the second main frequency is concentrated in 6.3 − 16 Hz. The business building has the largest vibration due to its closest distance to the metro line. Secondary noises of most of the TOD buildings exceed the limit value, and the maximum exceeding value is 11.7 dB(A). FST is effective in controlling train-induced vibration and secondary noise of TOD buildings. FST cannot reduce vibrations in full frequency band, and vibration in some frequency bands are even amplified according to the stiffness of steel spring.
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Basement Design for Vibration Reduction of High-Rise Buildings under Metro Operation
Zhaowei Chen,Song Peng,Defeng Zeng,Qinglie He,Jing Tang,Mengqi Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.4
Vibration induced by metro operation on the underground line is transmitted to the buildings above the line, which adversely affects on the normal life and work of human in the building. To study this problem, based on the plate-shell vibration theory, a plate-column-plate coupled model is constructed to analyze the influence of plate thickness, plate elastic modulus and column arrangement on the vibration in mechanism firstly. Relying on a practical engineering problem, two models are established, namely a train-track coupled dynamic model and a monolithic track bed-tunnel-soil-building model, loading fastener force from the train-track coupled dynamic model on the monolithic track bed, vibration propagates to high-rise building through soil-building coupling. Field test is conducted to verify the reliability of the numerical model. On the basis, the vibration law of building under different basement floor thicknesses, basement floor material and arrangement of non-permanent columns are studied. Results show that changing the basement design parameters has different effects. The Z vibration level of building floor decreases with the increase of basement floor thickness. Basement floor thickness increases by 0.02 m, the Z vibration level of the floor decreased by 1.4 – 2.2 dB at most. The decrease of elastic modulus leads to a slight decrease of the Z vibration level of building, the change is less than 1 dB. Without changing the arrangement of basement load-bearing columns, reducing non-permanent structural columns significantly reduces the Z vibration level, with attenuation of up to 5.1 dB.
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