Influence of reinforcement viscous properties on reliability of existing structures strengthened with externally bonded composites
Influence of reinforcement viscous properties on reliability of existing structures strengthened with externally bonded composites
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DOI：
10.1016/j.compstruct.2018.05.111
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发表时间：
2018-09
影响因子：
6.3
通讯作者：
V. P. Berardi;L. Feo;G. Mancusi;M. D. Piano
中科院分区：
文献类型：
--
作者：
V. P. Berardi;L. Feo;G. Mancusi;M. D. Piano
本文分析了采用外部粘合纤维增强聚合物 (FRP) 系统加固的现有结构中由于加固的粘性效应而导致的随时间变化的应力传递。通过组装两个一维组件（现有结构元件和外部加固）并考虑 FRP 的薄壁截面几何形状，开发了一种用于评估这些复合梁的长期响应的新建模策略。对FRP层合板-钢筋混凝土（RC）组合梁进行了多次数值试验，并将相应的结果与有效模量法（EM）的预测进行了比较。观察到所检查的强化结构的部件之间存在相关的应力重新分布。
The time-depending stress transfer in existing structures strengthened with externally bonded fiber reinforced polymer (FRP) systems, due to viscous effects of reinforcement, is analysed in this paper. A new modelling strategy for assessing the long-term response of these composite beams was developed, by assembling two one-dimensional components (existing structural element and external strengthening) and accounting for thin-walled sectional geometry of FRPs. Several numerical experiments dealing with FRP laminates-reinforced concrete (RC) composite beams were performed and the corresponding results were compared with the predictions of the Effective Modulus Method (EM). A relevant stress redistribution between the components of the examined strengthened structures was observed.