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预应力混杂纤维增强聚合物加固混凝土梁的抗弯性能参数研究

Parametric Study of Flexural Strengthening of Concrete Beams with Prestressed Hybrid Reinforced Polymer.

作者信息

Wang Xiaomeng, Petrů Michal, Ai Jun, Ou Shikun

机构信息

Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentska 2, 461 17 Liberec, Czech Republic.

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

出版信息

Materials (Basel). 2019 Nov 18;12(22):3790. doi: 10.3390/ma12223790.

DOI:10.3390/ma12223790
PMID:31752232
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6888612/
Abstract

The strengthening method of using hybrid fiber reinforced polymer is an effective way to increase the strengthening efficiency and lower the cost. This paper focuses on simulating the flexural behavior of reinforced concrete beam strengthened by prestressed C/GFRP (Carbon-Glass hybrid Fiber Reinforced Polymer) with different hybrid ratios and prestress levels. An elastoplastic damage constitution is used to simulate the mechanical behavior of concrete. A cohesive zone model under mixed mode is adopted to describe the debonding behavior of the FRP-concrete and concrete-steel interface. The results show good agreement with the experiment in the load-deflection curve, load-stress curve of steel, and HFRP. Furthermore, the failure mode of concrete and FRP debonding obtained from numerical simulation is the same as the test. Considering the improvement of the bending capacity, stiffness, and ductility of the strengthened beam in this paper, the best hybrid ratio of carbon to glass fiber is 1:1, and the suitable prestress level is between 30 and 50% of its ultimate strength.

摘要

采用混杂纤维增强聚合物的加固方法是提高加固效率和降低成本的有效途径。本文着重模拟了不同混杂比例和预应力水平的预应力C/GFRP（碳-玻璃混杂纤维增强聚合物）加固钢筋混凝土梁的抗弯性能。采用弹塑性损伤本构来模拟混凝土的力学行为。采用混合模式下的粘结带模型来描述FRP-混凝土和混凝土-钢材界面的脱粘行为。结果表明，在荷载-挠度曲线、钢材和HFRP的荷载-应力曲线上，数值模拟结果与试验结果吻合良好。此外，数值模拟得到的混凝土和FRP脱粘破坏模式与试验相同。考虑到本文中加固梁抗弯承载力、刚度和延性的提高，碳纤维与玻璃纤维的最佳混杂比例为1:1，合适的预应力水平为其极限强度的30%至50%。

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