基于粘弹性本构的CFRP加固RC梁数值仿真分析

徐佰顺; 马明; 钱永久; 唐继舜; 张方

doi:10.3969/j.issn.0258-2724.2017.05.021

基于粘弹性本构的CFRP加固RC梁数值仿真分析

doi: 10.3969/j.issn.0258-2724.2017.05.021

基金项目:

国家自然科学基金资助项目（50978221）

详细信息

作者简介:
徐佰顺(1986-),男,博士研究生,研究方向为既有桥梁评估、诊断与加固理论,E-mail:xu_baishun@sina.com

通讯作者:
钱永久(1963-),男,教授,博士生导师,研究方向为既有桥梁评估、诊断与加固理论、预应力混凝土结构理论以及大跨度混凝土桥梁的设计理论与工程实践,E-mail:yjqian@sina.com

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- 文章访问数: 525
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出版历程
- 收稿日期: 2016-03-11
- 刊出日期: 2017-10-25

Numerical Simulation Analysis of RC Beams Strengthened with CFRP Using Viscoelasticity Constitutive

摘要

摘要: 为探讨胶黏剂粘弹性对碳纤维增强复合材料（CFRP）加固钢筋混凝土（RC）梁力学行为的影响，以Burger模型表征胶黏剂的应力-应变-时间关系，利用Laplace变换和逆变换推导了Burger模型Prony级数形式的松弛剪切模量；采用ABAQUS对粘贴CFRP加固RC梁进行数值模拟，分析了胶黏剂粘弹性对界面应力、CFRP轴力、RC梁弯矩和加固梁挠度的影响.研究结果表明：胶黏剂的粘弹性对加固梁的力学行为有一定的影响，随着持载时间的增加，界面峰值剪应力和峰值正应力均减小，CFRP轴力减小，RC梁弯矩增大，加固梁挠度增大；当胶层厚度为0.2 mm时，加载30 d后，界面峰值剪应力减小了40.1%，界面峰值正应力减小了33.0%，加固梁挠度增加了3.7‰，距离CFRP端部20 mm处截面上CFRP轴力减小了15.8%，RC梁弯矩增加了17.4%.
- 加固 /
- 力学行为 /
- 粘弹性 /
- 本构关系 /
- 仿真分析
Abstract: In order to investigate the mechanical behavior influence of the adhesive viscoelastic on reiforced concrete beams strengthened with the carbon fiber reinforced polymer, the Burger model was used to describe the stress-strain-time relation for the adhesive. The relaxation shear modulus with Prony series forms of Burger model was derived by the mathematical method of Laplace transform and inverse Laplace transform. The finite element software ABAQUS was used to simulate RC beams strengthened with the CFRP. The influence of the adhesive viscoelastic on the stresses of the adhesive, the axial force of the CFRP, the moment of RC beams and the deflection of the reinforced beam were analyzed. The results show that the adhesive viscoelastic affect the mechanical behavior of the reinforced beam to a certain degree. With the increasing of the loading time, the shear stresses and normal stresses peak value of the adhesive decrease, the axial force of the CFRP decrease, the bending moment of the RC beam increase and the deflection of the reinforced beam increase. When the adhesive layer thickness is 0.2 mm, and the reinforced beam has been loaded for 30 d. The peak shear stress decreases by 40.1%, the normal peak stress decreases by 33.0%, the deflection of the reinforced beam increase by 3.7 ‰. On the cross section 20 mm away from the end of the CFRP, the CFRP axial force decreases by 15.8% and the bending moment of the RC beam increases by 17.4%.
- strengthen /
- mechanical behavior /
- viscoelastic /
- constitutive laws /
- simulation analysis

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参考文献(15)

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文章访问数: 525
HTML全文浏览量: 67
PDF下载量: 58
被引次数: 0

基于粘弹性本构的CFRP加固RC梁数值仿真分析

doi: 10.3969/j.issn.0258-2724.2017.05.021

作者简介: 徐佰顺(1986-),男,博士研究生,研究方向为既有桥梁评估、诊断与加固理论,E-mail:xu_baishun@sina.com

通讯作者: 钱永久(1963-),男,教授,博士生导师,研究方向为既有桥梁评估、诊断与加固理论、预应力混凝土结构理论以及大跨度混凝土桥梁的设计理论与工程实践,E-mail:yjqian@sina.com

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Numerical Simulation Analysis of RC Beams Strengthened with CFRP Using Viscoelasticity Constitutive

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目录

作者简介:
徐佰顺(1986-),男,博士研究生,研究方向为既有桥梁评估、诊断与加固理论,E-mail:xu_baishun@sina.com

通讯作者:
钱永久(1963-),男,教授,博士生导师,研究方向为既有桥梁评估、诊断与加固理论、预应力混凝土结构理论以及大跨度混凝土桥梁的设计理论与工程实践,E-mail:yjqian@sina.com