外贴碳纤维布加固混凝土梁的徐变试验及有限元模拟  

Creep experiment and finite element simulation of concrete beams strengthened with external carbon fiber-reinforced polymer

作　　者：张洋[1] 黄悦 张益宁 孟祥伦 ZHANG Yang;HUANG Yue;ZHANG Yining;MENG Xianglun(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525

出　　处：《青岛理工大学学报》2025年第2期40-48,共9页Journal of Qingdao University of Technology

基　　金：山东省自然科学基金面上项目(ZR202102280030)。

摘　　要：通过对2条外贴CFRP加固钢筋混凝土试验梁进行长期持续荷载作用下的持荷试验,并采集相关数据,使用ABAQUS有限元软件UMAT子程序定义混凝土材料的收缩、徐变的数值模型,建立了外贴CFRP加固钢筋混凝土试验梁在长期持续荷载作用下的时变分析模型。试验测量数值与有限元分析模型数值差距较小,证明了该模型分析的可靠性,可以利用模型来进行不同数值参数下的有限元分析。同时还考虑了环氧胶黏结剂随时间变化的剪切蠕变行为,发现胶层蠕变对试验梁附加挠度的影响较小,但为了使模拟值更加准确,应考虑胶层蠕变的影响。The load holding test of two reinforced concrete test beams strengthened by external CFRP was carried out under long-term sustained load,and relevant data were collected.The numerical model of the shrinkage and creep of the concrete materials was defined using the UMAT subroutine of ABAQUS finite element software.A time-varying analysis model of the reinforced concrete test beams strengthened by external CFRP under long-term sustained load was established.The difference between the values measured by the test and the values from the finite element analysis model is small,which proves the reliability of the analysis by the model and proves that the model can be used to carry out finite element analysis under different numerical parameters.At the same time,the shear creep behavior of epoxy adhesive with time change was also considered.It is found that the influence of the creep of epoxy adhesive layer on the additional deflection of the test beams is small.However,in order to make the simulation more accurate,the influence of the creep of epoxy adhesive layer should be considered.

关 键 词：CFRP加固混凝土梁 持续荷载 徐变 试验 有限元模拟 

分 类 号：TU746.3[建筑科学—建筑技术科学] TU375.1