摘要
为了分析工字钢梁弯曲变形产生的剪力滞效应对黏结层法向应力和切应力的影响,基于虚功原理的能量变分法建立考虑剪力滞的碳纤维增强复合材料(CFRP)加固梁黏结应力计算理论方程.通过与试验和有限元数值模拟结果的对比,验证了理论方程的正确性.开展不同弯矩作用下的工字型钢梁黏结层界面切应力和法向应力参数分析.结果表明,剪力滞引起的翼缘板纵向位移沿横向3次抛物线分布的假定是合理的.剪力滞效应对CFRP加固工字钢梁弯曲变形下的端部界面应力影响不可忽略,影响程度随着截面弯矩和翼缘板宽度的增加而增大.
The theoretical equations for interfacial stress calculation of carbon-fiber reinforced plastics(CFRP)reinforced beam considering shear lag were established based on the energy variational method of virtual work principle in order to analyze the effect of shear lag generated by bending deformation of I-section steel beams on interfacial normal and shear stresses of the adhesive layer.Then the correctness of the theoretical equations was verified by comparing with the experiment and finite element results.Interfacial shear and normal stresses of the adhesive layer of I-section steel beams under the action of different bending moments were conducted.Results show that assuming the longitudinal displacement of the flange plates caused by shear lag distributed in the cubic parabolic function along the lateral direction is reasonable.The shear lag effect cannot be ignored on interfacial stresses at the ends of the CFRP reinforcing I-section steel beams under bending deformation,and the impact degree magnifies with the increase of the section bending moment and flange plate width.
作者
朱佩云
李晓章
余明明
谢旭
ZHU Peiyun;LI Xiaozhang;YU Mingming;XIE Xu(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2024年第5期1020-1028,共9页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(52178174,51878606)。
关键词
碳纤维增强复合材料(CFRP)
工字型钢梁加固
剪力滞
能量变分法
界面应力
carbon-fiber reinforced plastics(CFRP)
reinforcement of I-section steel beam
shear lag
energy variational method
interfacial stress
