Abstract
The dynamic behavior of lively footbridge is a complex problem. Recently there were numerous publications and recommendations related to the dynamic nature of footbridge. The complicated procedure which was set in a number of instructions and standards says nothing about actions aimed at avoiding critical frequency range in structure. In the paper, results of dynamic in-situ tests of cable-stayed all-GFRP (Glass Fiber Reinforced Polymer) footbridge are presented. Fiberline Footbridge, located in Kolding city in Denmark, was constructed in 1997 using 12 different pultruded profiles all made of GFRP material. The dynamic characteristics as well as vertical response of the tested footbridge under human excitation are given and discussed. Firstly, in order to estimate the dynamic properties of the footbridge, a series of free-decay responses under human jumping were conducted. The fundamental frequency of the analyzed structure was within a critical range. A methodology for footbridge classification with regard to their dynamic sensitivity was worked out and the correlation between the structure's properties and its dynamic response under pedestrian excitation was formulated. It was found that the analyzed footbridge fulfilled vibration comfort criteria elaborated by technical guide Sétra, however, more restricted acceleration limits suggested by Eurocode were not met.
Highlights
The trend toward the constructing of light and flexible footbridges design to actuality the necessity of development of mechanical solutions for mitigation of vibrations induced by both the wind and pedestrians [1]
The research program created by Chróścielewski and Wilde et al [8] was greatly expanded beyond the typical set of all-Glass Fiber-Reinforced Polymer (GFRP) bridge acceptance tests
The primary aim of previous papers was to study changes in dynamic characteristics and the structural stiffness of the cable-stayed Fiberline Bridge made entirely of Glass Fiber Reinforced Polymer (GFRP) composite exploited for 20 years in the fjord area of Kolding, Denmark
Summary
The trend toward the constructing of light and flexible footbridges design to actuality the necessity of development of mechanical solutions for mitigation of vibrations induced by both the wind and pedestrians [1] It has been reported in the literature that when comparing to measurements a force model can overestimate the responses. There are a lot of bridges, where the problem of excitation by pedestrians can be excluded or limited by smart design of stiffness and mass distribution in the structure Such action can often avoid critical frequency ranges and minimize their expenses on additional artificial damping [4]. The research program created by Chróścielewski and Wilde et al [8] was greatly expanded beyond the typical set of all-GFRP bridge acceptance tests It was divided into two main parts: static - two ballast settings and dynamic – pedestrian forcing, modal hammer and an exciter. It was found that the analyzed footbridge fulfilled vibration comfort criteria elaborated by technical guide Sétra, more restricted acceleration limits suggested by Eurocode were not met
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