Fatigue reliability analysis of stay cables under combined effect ofwindvehicle load and iced accretion(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年02期
- Page:
- 91-99
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Fatigue reliability analysis of stay cables under combined effect ofwindvehicle load and iced accretion
- Author(s):
- TAN Dongmei; LUO Suzhen; QU Weilian; MAO Shanming; LIU Xiaofei
- (Hubei Key Laboratory of Roadway Bridge & Structure Engineering， Wuhan University of Technology,Hubei 430070, Wuhan, China）
- Keywords:
- bridge engineering; fatigue reliability; cumulative damage theory; iced accretion; combined effect of windvehicle load; autoexcited vibration
- PACS:
- -
- DOI:
- -
- Abstract:
- To analyze the fatigue reliability of stay cables under the combined effects of random wind load, vehicle load, and ice accretion, the Tianxingzhou Yangtze River Bridge was considered as the engineering background for specific research. First, the load spectrum of a random vehicle was simulated according to the Monte Carlo method. The vehicle model was transformed into the model of node dynamic load input cablestayed bridge. The time history of wind speed was generated through the harmonic superposition method. The static wind force, buffeting force, and aerodynamic autoexcited force due to wind load were applied to the model. The horizontal wind galloping effect of fanshaped iced accretion cable was then considered using the principle of autoexcited vibration. Fluent software was used to simulate the lift coefficient in the ice accretion cable. The lift was applied to the cable at an angle of 30°. The time history of the cable when applied to the corresponding simulated point girders was observed. Finally, based on the cumulative damage theory for cablestayed bridge in random vehicle load, the combined effect of random windvehicle load and iced accretion under the fatigue reliability of cable was analyzed to obtain the fatigue reliability index of the cable. The results show that the fatigue reliability index of the cable under the combined effects of wind load and vehicle load is less than that under single random vehicle load. The fatigue reliability index of the shortest cable decreased by approximately 21%. Iced accretion had minimal effect on the fatigue reliability index. Considering that the maximum force caused by the iced accretion is greater than the maximum force of the other two cases, the effect cannot be ignored. The effect of wind load on fatigue reliability is significant. The degree of influence increased from short to long cables. This method is mainly to load in the form of a node dynamic load applied to the bridge deck simulation point. Therefore, the proposed method can also be applied to the fatigue reliability analysis of other bridges. 11 figs, 25 refs.
Last Update: 2019-04-01