橫風(fēng)作用下車—橋系統(tǒng)氣動性能及動力響應(yīng)研究
[Abstract]:In recent years, with the continuous development of high-speed railway in China, some cable-stayed bridges have become the mainstream of railway construction in our country because of their soft aesthetic effect, flexible span, simple construction and good economic performance. However, due to the late start of some cable-stayed bridges in China, there are few researches on their wind resistance and dynamic characteristics. In this paper, a part of cable-stayed bridge is used as the background, and the aerodynamic performance of the off-bridge system under cross-wind action is studied by using three-dimensional numerical simulation method. The static wind response of the cable-stayed bridge and the dynamic characteristics of the bridge under the action of wind and train are analyzed. The main work and conclusions are as follows: 1. The three-dimensional model of a partial cable-stayed bridge is established, and the three-point force coefficient of the bridge under different wind fields is obtained by numerical simulation. The influence of wind attack angle, wind speed and pier on the three-point force coefficient of the bridge is analyzed. The static wind response of the bridge is analyzed by finite element software Midas Civil. The results show that at 0 擄angle of attack, the static wind instability of the cable-stayed bridge does not occur when the wind speed reaches 80m/s, and the safety can be guaranteed. When the train is running on the bridge, it will lead to the movement of the surrounding air and form "train wind", which has a great influence on the characteristics of the flow field around the bridge. The simplified model of a certain type of train is selected and the three-car marshalling is adopted. The sliding grid technique is used to simulate the train running in the cable-stayed bridge. The aerodynamic performance of the vehicle-bridge system is analyzed when the train passes through the bridge under the action of crosswind. The results show that aerodynamic force and aerodynamic moment of bridge and train vary significantly with speed and wind speed. Based on the basic theory of multi-body dynamics of high-speed train, the simulation model of train is established by Simpack software. The aerodynamic force and aerodynamic moment of high-speed train passing through bridge under crosswind are applied to the multi-body dynamics model, and the wheel-rail force is obtained. The dynamic response of the bridge under the action of wind and train is analyzed by Midas Civil cable-stayed bridge model. The results show that the train running on the cable-stayed bridge has great influence on the lateral displacement and acceleration of the bridge.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U441.3
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