摘要
为研究掺入钢纤维的大粒径再生粗骨料混凝土梁的受弯性能,设计了4根再生混凝土梁,主要设计参数为钢纤维掺量、再生粗骨料取代率、碳纤维布(CFRP布)加固。通过单调加载试验对4根梁的破坏特征、荷载⁃挠度曲线、钢筋应变以及抗弯承载力进行了研究,并采用ABAQUS有限元软件对4根梁进行了建模分析。结果表明,各试件梁均发生受弯破坏且平截面假定仍然成立;再生粗骨料取代率为50%和100%时,梁的承载力分别提高约8.4%和2.8%,采用碳纤维布加固后梁的承载力提高约7%;ABAQUS有限元软件分析结果与试验结果符合较好,基于现行规范公式得到的各试件梁极限抗弯承载力计算结果与试验结果符合较好,对钢纤维大粒径再生粗骨料混凝土梁设计具有较好的适用性。
In order to study the flexural behavior of recycled concrete beam with large diameter coarse aggregate mixed with steel fiber,four recycled concrete beams were designed.The main design parameters were the content of steel fiber,the replacement rate of recycled coarse aggregate and the reinforcement of carbon fiber sheets(CFRP sheets).The failure characteristics,load-deflection curves,reinforcement strain and bending capacity of the four beams were studied by monotone loading test,and the finite element software ABAQUS was used to model and analyze the four beams.The results show that flexural failure occurs in all specimens and the assumption of flat section is still valid.When the replacement rate of recycled coarse aggregate is 50%and 100%,the bearing capacity of the beam is increased by about 8.4%and 2.8%,respectively.The bearing capacity of the beam strengthened by CFRP cloth can be improved by about 7%.The finite element analysis results of ABAQUS software are in good agreement with the test results,and the calculation results of the ultimate flexural capacity of each specimen beam based on the formulas in the current code are in good agreement with the test results,which has good applicability to the design of recycled concrete beam with large diameter coarse aggregate of steel fiber.
作者
刘春阳
高英棋
顾一凡
吴洋洋
于桂欣
LIU Chunyang;GAO Yingqi;GU Yifan;WU Yangyang;YU Guixin(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,China)
出处
《建筑结构》
CSCD
北大核心
2021年第21期68-72,89,共6页
Building Structure
基金
北京工业大学重点实验室校外开发课题(2020B03)。
关键词
大粒径再生粗骨料
再生混凝土梁
抗弯性能
有限元分析
承载力计算
large particle size recycled coarse aggregate
recycled concrete beam
bending performance
finite element analysis
bearing capacity calculation
