碳纤维织物增强水泥砂浆板平面内抗剪性能
2021-07-01周芬陈小晔杜运兴
周芬 陈小晔 杜运兴



摘 要:采用单点加载试验研究了碳纤维织物增强水泥砂浆(carbon textile reinforced mortar,CTRM)板的平面内抗剪性能,以碳纤维织物层数、钢纤维掺量两个因素对CTRM复合板力学性能进行研究. 试验结果表明:随着织物层数的增加,试件的斜截面开裂荷载、极限荷载以及开裂前刚度和开裂后刚度都得到了明显的提高;提高钢纤维掺量可以有效提高试件的斜截面承载力,提高斜截面开裂荷载和极限荷载,并且可以有效改善碳纤维织物与水泥砂浆的界面性能,减轻织物与水泥砂浆的剥离破坏程度. 最后,提出了CTRM板平面内抗剪承载力的计算方法.
关键词:碳纤维织物层数;钢纤维掺量;斜截面开裂荷载;极限荷载;刚度
中图分类号:TU383 文献标志码:A
Abstract:The one-point loading test was used to study the in-plane shear behavior of carbon textile reinforced mortar (CTRM) plate. The carbon textile layers and steel fiber content were used as the parameters to study the mechanical properties of the CTRM plate. The test results show that with the increase of the number of textile layers, the oblique section crack load, ultimate load, stiffness before cracking and stiffness after cracking of the specimens are significantly improved. Steel fiber content can effectively increase the oblique section bearing capacity, oblique section crack load and ultimate load of the specimens, and can effectively improve the interface performance between carbon textile and mortar, which can reduce the degree of peeling damage between carbon textile and mortar. Finally, a calculation method for the in-plane shear capacity of the CTRM plate is proposed.
Key words:carbon textile layers;steel fiber content;oblique section crack load;ultimate load;stiffness
钢筋混凝土梁的加固是加固工程中的重要组成部分. 目前常用的方法有增大截面法、黏钢法、织物增强复合材料(Fiber Reinforced Polymer,简称FRP)加固法、织物增强水泥砂浆(TRM)加固法等. 其中,TRM加固法是一种新型的加固方法,该方法既具有轻质、耐腐蚀、耐高温的优势,又具有自重轻、截面增加小的优势,因此该加固方法更符合加固技术的趋势. 目前的TRM加固法均采用湿作业的施工方法,即采用水泥砂浆材料将纤维织物分层粘贴在加固构件表面. 有学者[1]研究了TRM对钢筋混凝土梁的抗剪加固,研究表明,随着纤维织物层数的增加,构件加固后的承载力随之提高. Tetta等[2-3]的研究表明,纤维织物编织方式对加固构件的破坏形态有一定的影响,但随着……
