首页|Modal identification and damping performance of a full-scale GFRP-SFRSCC hybrid footbridge
Modal identification and damping performance of a full-scale GFRP-SFRSCC hybrid footbridge
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NETL
NSTL
Wiley
Slender footbridges are prone to excessive vibrations due to pedestrian effects,and comfort criteria often govern their design. In this sense, composite materialsthat combine high damping capacity with relatively high stiffness andlow mass can provide functional benefits. This paper presents a study of thedynamic behaviour of an 11 m long hybrid footbridge made of two I-shapedpultruded glass fibre reinforced polymer (GFRP) main girders and a thin steelfibre reinforced self-compacting concrete (SFRSCC) deck, in operation since2015. The main goals were (i) to improve the knowledge of the dynamic propertiesof composite footbridges and (ii) to assess the benefits of using a structuremade of pultruded GFRP instead of a conventional material (steel),namely, considering its greater ability to dissipate energy. The resonant frequencies,damping ratios, and mode shapes of the footbridge were identifiedbased on experimental testing. A finite element (FE) model of the footbridgewas developed and calibrated with test data and used to simulate the effects ofpedestrian loads. Simulations of the same type were conducted on an equivalentstructural system made of steel profiles. The simulation results of the twoshort-span footbridges with similar natural frequencies enhance the impact ofhigh-order harmonics of the pedestrian load in the dynamic response. It is alsoshown that polymer-based components can contribute to limiting vibrations infootbridges or even act as self-dampers.
NETL
NSTL
Wiley
