Virtual beam element method used to calculate the vehiclebridge coupled vibration with road roughness(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年05期
- Page:
- 59-67
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Virtual beam element method used to calculate the vehiclebridge coupled vibration with road roughness
- Author(s):
- FENG Guanjie; CHEN Huai; WANG Yan; CHEN Daihai
- (School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China)
- Keywords:
- bridge engineering; virtual beam element; contact analysis; vehiclebridge coupled vibration; road roughness
- PACS:
- -
- DOI:
- -
- Abstract:
- To accurately and efficiently calculate the effects of road roughness on the vehiclebridge coupling vibration problem, a method employing virtual unevenness beam elements in the contact analysis procedure was proposed to deal with the road roughness. The interface contact method was used to establish the coupling force transfer between the vehicle and the rigid beam of the uneven track. The rigid beam of the uneven track was simulated as a motorized system to establish the connection between the vehicle and the bridge structure， and the rigid beam of the uneven track was set as the driving track of the wheel，the programming difficulty of the input for road roughness was simplified. The results show that the setting of virtual unevenness beam elements has no effect on the structural stiffness and structural natural dynamic characteristics. The results of the virtual beam element method were barely affected by the element size of the finite model of a simply supported beam, and the results are stable. When the example bridge with a smooth surface is crossed by different kinds of vehicles at different speeds, the difference between the separate iteration method results and the reference result is 1.14%, for the midspan maximum dynamic displacement, the difference between the virtual unevenness beam elements method results and the reference result is 2.06%. When the example bridge with road roughness class A is crossed by a 1/4 model vehicle at 40 km/h. The midspan maximum dynamic deflection the difference between the two methods is 1.58%，while with road roughness class B, the difference is 2.99%, and with road roughness class C, the difference is 3.62%. Using the virtual unevenness beam elements method, when the plane slab bridge is crossed by seven degrees of freedom vehicles at different speeds, the maximum difference compared with the reference result is 2.45%. Comparing the CPU time cost between the two methods, the time cost of the separation iterative method is four times that for the virtual unevenness beam element method, which has higher efficiency. The virtual beam element method can accurately take into account the influence of road surface roughness, and has higher accuracy in solving the coupling vibration problems of space vehicles and threedimensional bridges, and exhibit higher calculation efficiency, compared with the traditional separation iteration method. 5 tabs, 10 figs, 25 refs.
Last Update: 2019-10-16