配GFRP筋的钢-UHPC组合梁负弯矩区抗弯性能有限元分析  

Finite element analysis on flexural performance of steel-UHPC composite beams with GFRP bars in negative bending moment zone

作　　者：崔艳 万祥 徐骁青[2] 田甲旭 贺君 CUI Yan;WAN Xiang;XU Xiaoqing;TIAN Jiaxu;HE Jun(Road&Bridge International Co.,Ltd.,Beijing 101117,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha Hunan 410114,China)

机构地区：[1]中交路桥建设有限公司,北京101117 [2]同济大学土木工程学院,上海200092 [3]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中国安全生产科学技术》2025年第4期79-85,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(52378127);湖南省自然科学基金项目(2022JJ10049)。

摘　　要：为研究由GFRP筋代替钢筋对钢-UHPC组合梁负弯矩区抗弯承载性能的影响,采用ABAQUS软件建立组合梁非线性有限元分析模型,以筋材种类、配筋率为参数,分析GFRP筋对特征荷载、刚度、延性等力学性能的影响。同时,由开裂UHPC单元的应变场及损伤场,计算得到组合梁模型的荷载-主裂缝宽度曲线,分析GFRP筋及配筋率对组合梁负弯矩区抗裂性能的影响。研究结果表明:钢-UHPC组合梁模型的破坏模式均为典型的受弯破坏模式,UHPC开裂主要发生在组合梁的纯弯段;同等配筋率下,采用GFRP筋代替钢筋将削弱组合梁的抗弯刚度,不利于控制裂缝发展,但可以提高组合梁的承载能力及延性;提高GFRP筋配筋率能有效改善组合梁负弯矩区的抗裂性能。研究结果可为提高组合梁负弯矩区的抗弯性能提供参考。In order to study the influence of replacing steel bars with GFRP bars on the flexural bearing performance of steel-UHPC composite beams in the negative moment zone,the nonlinear finite element analysis models of composite beams were established by ABAQUS software,and the influence of GFRP bars on the mechanical properties such as characteristic load,stiffness and ductility was analyzed by taking the type of reinforcement and reinforcement ratio as the parameters.Meanwhile,the load-main crack width curve of the composite beam model was calculated from the results of the strain field and damage field of the cracked UHPC elements,and the influence of GFRP bars and reinforcement ratio on the crack resistance of composite beams in the negative moment zone was analyzed.The results show that all the failure modes of the steel-UHPC composite beam models are the typical bending failure modes,and UHPC cracking mainly occurs in the pure bending section of the composite beam.Under the same reinforcement ratio,the use of GFRP bars instead of steel bars will weaken the flexural stiffness of composite beams,which is not conducive to control the development of cracks,but can improve the bearing capacity and ductility of composite beams.Increasing the reinforcement ratio of GFRP bars can effectively improve the crack resistance of composite beams in the negative moment zone.The research results can provide a reference for improving the bending resistance of composite beams in the negative bending moment zone.

关 键 词：UHPC GFRP 配筋率 裂缝宽度 有限元 

分 类 号：X947[环境科学与工程—安全科学] X913