HB-FRP加固钢筋混凝土梁抗弯试验及数值模拟

doi:10.19936/j.cnki.2096-8000.20240728.010

复合材料科学与工程 ›› 2024, Vol. 0 ›› Issue (7): 74-85.DOI: 10.19936/j.cnki.2096-8000.20240728.010

HB-FRP加固钢筋混凝土梁抗弯试验及数值模拟

李岩¹, 魏琦安², 石南³, 高磊^4*, 王佳斌³, 黄悦²

1.山东高速建设管集团有限公司,济南 250014;
2.青岛理工大学土木工程学院,青岛 266033;
3.山东高速烟蓬公路有限公司,威海 265800;
4.山东大学岩土与结构工程研究中心,济南 250061

收稿日期:2023-05-18 出版日期:2024-07-28 发布日期:2024-08-08
通讯作者: 高磊(1989—),男,博士,副研究员,主要从事混凝土结构加固方面的研究,lei.gao@sdu.edu.cn。
作者简介:李岩(1977—),女,学士,高级工程师,主要从事桥梁结构加固方面的研究。
基金资助:
山东省自然科学基金青年项目(ZR2021QE216)

Experimental and numerical simulations of HB-FRP flexural reinforced beam

LI Yan¹, WEI Qi'an², SHI Nan³, GAO Lei^4*, WANG Jiabin³, HUANG Yue²

1. Shandong Hi-speed Construction Mangement Group Co., Ltd., Jinan 250014, China;
2. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
3. Shandong Hi-Speed Yanpeng Highway Co., Ltd., Weihai 265800, China;
4. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China

Received:2023-05-18 Online:2024-07-28 Published:2024-08-08

摘要/Abstract

摘要： 为研究混合粘贴FRP(HB-FRP)加固混凝土(RC)梁的抗弯性能,对八片HB-FRP加固梁进行三点弯曲试验,研究了螺栓扭矩、扣件间距、锚固分布模式以及FRP板黏结方式对试件的破坏模式、荷载-挠度曲线以及FRP应变分布的影响规律。基于有限元软件ABAQUS建立HB-FRP加固RC梁的精细有限元模型,通过试验结果验证模型并开展参数分析。结果表明:与未加固梁相比,HB-FRP加固梁的极限荷载提高了71%~156%,极限荷载和FRP利用率随螺栓扭矩的增加而提高,随着扣件间距的增加而降低;通过消除扣件与FRP板之间的黏结,试件均发生了FRP板剥离破坏;跨中集中和端部集中锚固的加固效果不稳定,易提前发生破坏;建立的HB-FRP加固RC梁计算模型精度良好,可用于抗弯性能的模拟计算;扣件宽度和碳板宽度的增加提高了HB-FRP加固梁的极限荷载;螺栓扭矩和扣件宽度过高会导致受压区混凝土提前破坏;FRP的利用率随着FRP宽度增加而减小。

关键词: 加固, 纤维增强塑料, 抗弯, 有限元, 锚固参数, 复合材料

Abstract: In order to study the flexural performance of concrete (RC) beams reinforced with hybrid bond FRP (HB-FRP), three-point bending tests were conducted on eight HB-FRP reinforced beams to investigate the effects of bolt torque, fastener spacing, anchorage distribution pattern and FRP plate bonding method on the damage pattern, load-deflection curve and FRP strain distribution of the specimens. Based on the finite element software ABAQUS, a finite element model of HB-FRP strengthened RC beams was established, and the model was verified by test results and parametric analysis was carried out. The results show that the ultimate load of HB-FRP strengthened beams is increased by 71%~156% compared with unreinforced beams, and the ultimate load and FRP utilization rate increase with the increase of bolt torque and decrease with the increase of fastener spacing; FRP plate peeling damage occurs in all specimens by eliminating the bond between fasteners and FRP plates; the reinforcement effect of span-centered and end-centered anchorage is unstable and prone to early damage occurred; the established calculation model of HB-FRP reinforced RC beams has good accuracy and can be used for the simulation of flexural performance; the increase of fastener width and carbon plate width increased the ultimate load of HB-FRP reinforced beams; the high bolt torque and fastener width will lead to premature concrete damage in the compression zone; the utilization rate of FRP decreases with the increase of FRP width.

Key words: reinforcement, FRP, flexual resistance, finite element, anchorage parameters, composites

中图分类号:

TB332

李岩, 魏琦安, 石南, 高磊, 王佳斌, 黄悦. HB-FRP加固钢筋混凝土梁抗弯试验及数值模拟[J]. 复合材料科学与工程, 2024, 0(7): 74-85.

LI Yan, WEI Qi'an, SHI Nan, GAO Lei, WANG Jiabin, HUANG Yue. Experimental and numerical simulations of HB-FRP flexural reinforced beam[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(7): 74-85.

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HB-FRP加固钢筋混凝土梁抗弯试验及数值模拟

Experimental and numerical simulations of HB-FRP flexural reinforced beam

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