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1. 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 |
2. 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 |
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