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1. Experiment research on influence of guide vane on vortex-induced vibration characteristics of bluff section | |||
BAI Hua,WANG Han,WEI Yangyang | |||
Transportation Engineering 20 June 2022 | |||
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Abstract:In order to study the effect of guide vane on the vortex-induced vibration characteristics of blunt steel box girder section, this paper first compares the vortex-induced vibration response of the original blunt steel box girder section and the blunt box girder with three different sizes and forms of guide vanes by wind tunnel test. Secondly, the vortex-induced vibration responses of blunt box girders with three different forms and sizes of guide vanes are compared by numerical simulation. Finally, through the comparative analysis of the flow field of the original blunt body section and the inverted L-shaped guide vane with different sizes, the reason for the vortex vibration phenomenon of the blunt body section is found. The results show that the horizontal guide plate has good vibration suppression effect on vertical bending vortex vibration, but it will increase the vibration amplitude of torsional vortex vibration. The inverted L-shaped guide vane has a very obvious suppression effect on the torsional vortex vibration and vertical bending vortex vibration of the blunt body section. By comparing the flow field, it is found that the vortex at the top of the section is eliminated, and the large-scale vortex at the tail is decomposed into smaller-scale vortex, so as to achieve the purpose of suppressing vortex vibration. | |||
TO cite this article:BAI Hua,WANG Han,WEI Yangyang. Experiment research on influence of guide vane on vortex-induced vibration characteristics of bluff section[OL].[20 June 2022] http://en.paper.edu.cn/en_releasepaper/content/4758007 |
2. Reaction spectrum comparative analysis of seismic performance of 62m concrete-filled steel tube beam bridge with curved string truss before and after reinforcement | |||
CHEN Daihai,XU Zhenqi,LI Zheng,MA Laijing,MA Fengrui | |||
Transportation Engineering 19 August 2019 | |||
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Abstract:Taking a 62m concrete-filled steel tube bridge with curved string truss as the research object, according to its reinforcement scheme, the spatial finite element models of the bridge before and after reinforcement were established by using the general finite element software ANSYS. The natural frequencies of the bridge before and after reinforcement were calculated, and the seismic performance of the bridge was analyzed by using the response spectrum method. The results show that the frequencies of the reinforced bridges increase in varying degrees, especially the vertical and torsional frequencies. Before and after reinforcement, the maximum axial force in the upper chord of the bridge is the largest, and the shear force and bending moment are small. The maximum internal force basically appears at the two ends of the upper chord. This position should be regarded as the weak link of the bridge seismic resistance. Under the same cases, the axial force of the bridge after reinforcement is reduced by about 30% compared with that before reinforcement, and the displacement of the bridge after reinforcement is reduced in varying degrees. The reinforcement measures can improve the lateral and vertical stiffness of the bridge, especially the stiffness of the deck system. | |||
TO cite this article:CHEN Daihai,XU Zhenqi,LI Zheng, et al. Reaction spectrum comparative analysis of seismic performance of 62m concrete-filled steel tube beam bridge with curved string truss before and after reinforcement[OL].[19 August 2019] http://en.paper.edu.cn/en_releasepaper/content/4749442 |
3. NUMERICAL SIMULATION OF PEDESTRIAN-BRIDGE DYNAMIC INTERACTION | |||
Peng Youlu,Wu Dingjun,Li Qi | |||
Transportation Engineering 10 March 2016 | |||
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Abstract:Researches on pedestrian-bridge interaction are not enough. In this paper, the pedestrian-induced lateral forces on a bridge are modelled as a sum of an equivalent static force exerted by pedestrians on rigid surface and a self-excited force due to an interaction between the pedestrian and the vibrating bridge. The dynamic balance equation is first established for the pedestrian-bridge interaction system. And then a new explicit integration method is applied to solve the equation with an iteration algorithm, computation procedures based on MATLAB are introduced simultaneously. In the case study at last, it is demonstrated that the new explicit integration method is absolutely reliable and there is nearly no difference between interaction and no interaction simulation in low crowd density, but big difference in high crowd denstiy. | |||
TO cite this article:Peng Youlu,Wu Dingjun,Li Qi. NUMERICAL SIMULATION OF PEDESTRIAN-BRIDGE DYNAMIC INTERACTION[OL].[10 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4679531 |
4. Updating the Finite Element Model of Complex Structures by Using the Kriging Preditor | |||
Liu Yang,Tang Xu,ZHang Shaoyi | |||
Transportation Engineering 14 December 2013 | |||
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Abstract:Updating the structural model of complex structures is time consuming due to the large size of the finite element model (FEM). Using conventional methods for these cases is computationally expensive or even impossible. A two-level method, which combined the Kriging predictor and the component mode synthesis (CMS) technique,was proposed to ensure the successful implementing of FEM updating of large-scale structures. In the first level, the CMS was applied to build a reasonable condensedFEM of complex structures. In the second level, theKriging predictor that was deemed as a surrogate FEM in structural dynamicswas generated based on the condensed FEM. Finally, the effectiveness of the proposed method was demonstrated by updating the FEM of a real arch bridge with the measured modal parameters. | |||
TO cite this article:Liu Yang,Tang Xu,ZHang Shaoyi. Updating the Finite Element Model of Complex Structures by Using the Kriging Preditor[OL].[14 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4574506 |
5. Research on Temperature Effect on the Natural Frequencies of Continuous Beams Based on Stochastic Subspace Identification | |||
Cheng Yongchun,Shi Yuping,Tan Guojin | |||
Transportation Engineering 21 January 2013 | |||
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Abstract: Natural frequencies are of great value to bridge structural design, health monitoring and detection. Related research data show that the ambient temperature can affect the natural frequencies of the continuous box-girder bridges. In order to research the effect of temperature on the bridge structure and conclude the influence law, theoretical analysis of temperature effect on the natural frequencies of the continuous box girder bridges is conducted based on the stochastic subspace identification. First, the finite element model of the bridge is built to conduct thermal-structural coupling analysis. Then regard the analysis results as the original state, and exert white noise excitation on the structure to obtain the dynamic response of the structure. And then analyze the dynamic response based on the stochastic subspace identification and calculate the natural frequencies of the bridges under the temperature effect. At last, based on the practical project of one 3-span continuous box-girder bridge, the validity and the reliability of this method is verified. | |||
TO cite this article:Cheng Yongchun,Shi Yuping,Tan Guojin. Research on Temperature Effect on the Natural Frequencies of Continuous Beams Based on Stochastic Subspace Identification[OL].[21 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4515647 |
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