基于粘弹性本构的CFRP加固RC梁数值仿真分析

发布时间：2018-05-25 02:44

  本文选题：加固 + 力学行为　； 参考：《西南交通大学学报》2017年05期

【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%.
[Abstract]:In order to investigate the effect of viscoelasticity of adhesive on the mechanical behavior of reinforced concrete RC beams strengthened with CFRP, the stress-strain-time relationship of adhesives was characterized by Burger model. The relaxation shear modulus of Burger model Prony series is derived by using Laplace transform and inverse transformation, and the effect of adhesive viscoelasticity on the bending moment and deflection of RC beams strengthened with CFRP is analyzed by using ABAQUS. The results show that the viscoelasticity of the adhesive has a certain influence on the mechanical behavior of the strengthened beam. With the increase of the holding time, the peak shear stress and the peak normal stress of the interface decrease. The axial force of CFRP decreases and the bending moment of the RC beam increases, and the deflection of the strengthened beam increases. When the thickness of the adhesive layer is 0.2 mm, after 30 days of loading, the peak shear stress of the interface decreases by 40.1, the peak normal stress of the interface decreases by 33.0, the deflection of the strengthened beam increases by 3.7 鈥，

本文编号：1931754