ECC层加固RC梁抗弯性能多参数增强作用分析  

Multi⁃parameter enhancement analysis of flexural performance of RC beams reinforced with ECC layers

作　　者：方建华 FANG Jianhua(Shaoxing Rail Transit Group Co.,Ltd,Shaoxing Zhejiang 312000,China)

机构地区：[1]绍兴市轨道交通集团有限公司,浙江绍兴312000

出　　处：《中国安全生产科学技术》2024年第S1期179-185,共7页Journal of Safety Science and Technology

摘　　要：为研究工程水泥基复合材料(ECC)加固层、在ECC中掺加钢纤维(SF)和ECC抗压强度对钢筋混凝土(RC)梁加固后抗弯性能的影响,采用试验研究和有限元模拟相结合的方法,分析以上3个参数对RC加固梁抗弯性能的影响规律。研究结果表明:掺加SF可以显著提升梁体开裂荷载,而对梁体延性和极限荷载影响较小;提高ECC抗压强度可以明显提升梁体屈服荷载和承载力,而对梁体延性影响较小;设置受压区ECC加固层可以明显提升梁体延性,而对承载力影响较小。有限元承载力最大相对误差为3.8%,荷载-挠度曲线最大相对误差为5.6%,计算结果与试验结果吻合程度较高,可用有限元模型对梁体抗弯全过程进行模拟。以上3个参数对RC梁抗弯性能具有不同提升效果,可为RC梁加固设计提供数据支撑。To study the influence of ECC reinforced layers,SF mixed with ECC and ECC compressive strength on the flexural performance of RC beams,the research methods of tests combined with finite element simulation were used to analyze the influence rules of the aforementioned three parameters on the flexural performance of RC reinforced beams.The research results show that SF can significantly increase the cracking load of the beam,but has little effect on the ductility and ultimate load of the beam.The increase of ECC compressive strength can evidently increase the beam’s yield load and bearing capacity but has little effect on the ductility.The ECC reinforcement layer in the compression zone can improve the ductility of the beam but has little influence on the bearing capacity.The maximum relative error of the finite element bearing capacity is 3.8%,and the maximum relative error of the load⁃deflection curve is 5.6%.The calculated results are highly consistent with the experimental results.The finite element model can be used to simulate the whole process of beam bending.The three parameters have different effects on the flexural performance of RC beams,which can provide data support for RC beam reinforcement design.

关 键 词：工程水泥基复合材料 有限元分析 抗弯性能 加固梁 钢纤维 

分 类 号：TU375.1[建筑科学—结构工程]