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Influence of mechanical uncertainties on dynamic responses of a full-scale all-FRP footbridge

机译：机械不确定性对全级全FRP行桥动态响应的影响

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摘要

This paper aims to determine the effects of uncertainties in the mechanical properties of FRP composites on the dynamic responses of a full-scale all-FRP bridge. The novelty of the study is in determining the effects that the uncertainties have on the global structural scale properties rather than component properties often studied in literature. To achieve this aim, both uncertainty quantification and global sensitivity analysis are performed using a computationally cost-effective approach based on the polynomial chaos expansion. The results reveal that a coefficient of variation (COV) of 10% for four mechanical parameters can lead to COVs of 3.37%, 2.92% and 3.07% for natural frequencies, COVs of 2.98%, 0.04% and 0.61% for modal masses (corresponding to unity-scaled mode shapes) of the first lateral, first vertical and second vertical modes, and COV of 0.93% for the absolute peak acceleration. The effect of uncertainties, therefore, is very small for the considered excitation case and it could be neglected in the design. In addition, it was found that the longitudinal elastic modulus and shear modulus of the panel are the most influential mechanical parameters in dynamic analysis.
机译：本文旨在确定不确定性在全级全FRP桥梁动力响应上FRP复合材料的力学性能的影响。该研究的新颖性在确定不确定性对全球结构规模性质而不是经常在文献中研究的组分特性的影响。为了实现这一目标，使用基于多项式混沌扩展的计算成本有效的方法进行不确定性量化和全局敏感性分析。结果表明，四个机械参数的10％的变异系数（COV）可导致COV的自然频率为3.37％，2.92％和3.07％，COV为2.98％，0.04％和0.61％的模态（相对）对于绝对峰值加速度的第一横向，第一垂直和第二垂直模式的单位缩放模式形状，COV为0.93％。因此，不确定的效果对于考虑的激励案例非常小，并且在设计中可能被忽略。此外，发现面板的纵向弹性模量和剪切模量是动态分析中最有影响力的机械参数。

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