重复荷载作用下钢-碳纤维复合筋混凝土梁变形性能分析  

Analysis of deformation behavior of steel-carbon fiber composite bars reinforced concrete beams under repeated loading

作　　者：王磊[1,2] 樊浪波[1] 易金 张继旺[1,2] 黄龙 WANG Lei;FAN Lang-bo;YI Jin;ZHANG Ji-wang;HUANG Long(College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]桂林理工大学广西建筑新能源与节能重点实验室,广西桂林541004

出　　处：《桂林理工大学学报》2022年第2期374-381,共8页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(52178194,51868014);广西自然科学基金项目(2018GXNSFAA281188)。

摘　　要：为研究钢-碳连续纤维复合筋(SFCB)混凝土梁在重复荷载作用下的变形性能,对SFCB混凝土梁进行重复荷载下的弯曲试验,分析试验梁在不同荷载水平重复作用下的破坏模式、荷载挠度反应及刚度退化规律等。试验表明:SFCB混凝土试验梁会出现因锚固不足而引发的弯剪破坏特征,有限的荷载重复作用对试验梁极限承载力没有明显影响。SFCB混凝土试验梁屈服后恢复性能比普通钢筋混凝土试验梁优越;钢芯屈服前,现行规范中SFCB混凝土梁挠度计算值与试验值较为接近,钢芯屈服后,计算值逐渐小于试验值,荷载越大差异越为明显,应充分考虑SFCB弹性模量的变化和相对滑移的影响。To study the deformation behavior of steel-carbon continuous fiber composite bars reinforced concrete(SFCB)beam under repeated loading,the bending test of SFCB concrete beam under repeated loading is carried out.The failure mode,load deflection response and stiffness degradation law of test beams under repeated loading at different load levels are analyzed.The results show that the SFCB concrete test beam will have bending shear failure characteristics caused by insufficient anchorage,and the limited load repetition has no obvious impact on the ultimate bearing capacity of the beams.The yield recovery performance of SFCB concrete test beam is superior to that of ordinary reinforced concrete test beam.Before the steel core yielding,the calculated value of SFCB concrete beam deflection in the current code is close to the test value.But after the steel core yielding,the calculated value is gradually less than the test value.The greater the loading,the more obvious the difference.So the change of SFCB elastic modulus and relative slip should be fully considered.

关 键 词：SFCB 重复荷载 混凝土梁 挠度 变形性能 刚度衰减 

分 类 号：TU375.1[建筑科学—结构工程]