碳纤维板加固H型钢梁剥离过程模拟及抗力分析  

Simulation and resistance analysis of debonding process of H steel beam reinforced with carbon fiber plate

作　　者：张鹏旭 ZHANG Pengxu(China Civil Engineering Construction Corporation,Beijing 100089,China)

机构地区：[1]中国土木工程集团有限公司,北京100089

出　　处：《工程建设》2025年第2期14-20,30,共8页Engineering Construction

摘　　要：为了建立更加方便、高效、直观的CFRP板加固钢梁有限元模型,基于“实体-板壳”黏贴-滑移界面模型,建立碳纤维板加固钢梁的三维模型,模拟未加固钢梁和贴板CFRP板加固钢梁的特征荷载、破坏模式及荷载-挠度曲线,分析不同荷载下CFRP板的应力变化和界面剥离过程,研究梁的剪跨比、跨高比和CFRP板的伸长比等因素对加固梁的界面剥离及剥离抗力的影响。结果表明:1)纯弯段长度对界面应力无影响,对剥离弯矩的影响也很小;2)在CFRP板伸长比不变的条件下,随着剪跨比的增大,截面抗弯承载力逐渐增大;3)在CFRP板伸入长度不变的条件下,随着剪跨比的增大,剥离弯矩先增大后减小。本文成果可为模拟CFRP板黏贴加固钢梁剥离过程和优化加固效能方面提供参考。In order to establish a more convenient,efficient and intuitive finite element model of CFRP plate reinforced steel beam,a three-dimensional model of reinforced steel beam of carbon fiber plate is established based on the"solidplate-shell"adhesion-slip interface model.The characteristic load,failure mode and load-deflection curve of the unreinforced steel beam and the steel beam reinforced with CFRP plate are simulated.The stress change and interface debonding process of the CFRP plate under different loads are analyzed.The influence of such factors as the shear span ratio,span-height-ratio of the beam and the elongation ratio of the CFRP plate on the interface debonding and debonding resistance of the reinforced beam is studied.The results show that:1)the length of the pure bending segment has no effect on the interfacial stress and has litle effect on the debonding bending moment;2)Under the condition that the elongation ratio of the CFRP plate remains unchanged,the bending bearing capacity of the section gradually increases with the increase of the shear span ratio;3)Under the condition that the insertion length of the CFRP plate remains unchanged,the debonding bending moment first increases and then decreases with the increase of the shear span ratio.The results can provide a certain reference for simulating the debonding process of steel beams reinforced with CFRP plates and optimizing the reinforcement efficiency.

关 键 词：CFRP板 H型钢梁 加固 抗力分析 有限元 模拟 

分 类 号：TU392.1[建筑科学—结构工程]