Comparative analysis of dynamic behaviour of two cablestayed footbridges made entirely of steel and GFRP composite

9th International Symposium on Steel Bridges

材料科学;运输工程

Górski, Piotr^1 ; Stankiewicz, Beata^1 ; Tatara, Marcin^1

Opole University of Technology, Faculty of Civil Engineering and Architecture, Department of Roads and Bridges, Katowicka Street 48, Opole

45-061, Poland^1

关键词: Comparative analysis;    Dynamic behaviours;    Glass fiber reinforced polymer;    Modal parameters;    Numerical results;    Professional software;    Structural vibrations;    Vertical accelerations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/419/1/012030/pdf
DOI  :  10.1088/1757-899X/419/1/012030

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper is focused on the comparative numerical analysis of the dynamic behaviour of two cable-stayed footbridges made entirely of steel and Glass Fiber Reinforced Polymer (GFRP) composite, with similar geometrical parameters and bearing capacity. The analysis was executed using the Autodesk Robot Structural Analysis Professional software. Firstly, the determination of modal parameters of both footbridges was done. For the further finite element analysis the damping ratio of the all-GFRP footbridge was measured in situ, whereas for the all-steel footbridge was taken from data published in the literature. Then, the dynamic responses of both structures were determined based on the Footfall harmonic analysis. In this case, the numerical models of analyzed footbridges were subjected to dynamic effects of human gait with various moving frequency. The maximal values of vertical acceleration of structural vibrations were obtained. The vibration comfort criteria for both footbridges were verified. The numerical results were compared and differences in dynamic responses of analyzed footbridges were examined. The obtained results delivered some important practical data regarding the dynamic response as well as vibration comfort criteria of cable-stayed footbridges which could be used at a design stage to make a decision on the construction material solution.