CFRP板侧面与底面嵌贴加固梁对比试验研究
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摘要
对侧贴和底贴CFRP板嵌入式加固钢筋混凝土梁进行抗弯性能试验研究,比较了多个对照组在相同加固量下侧贴梁和底贴梁对试件承载力、跨中挠度及裂缝发展情况的影响,对比分析了侧贴和底贴的加固效果。试验结果表明:两种加固方式均能显著提高加固梁的承载力和刚度,而对于屈服荷载、极限荷载和裂缝发展而言,侧面嵌贴加固在各方面都很接近底面嵌贴加固的加固效果,虽然在承载力上略有不如,但差距很小,而且施工便捷性、适用性和耐久性更好,可以在很多条件下替代底面嵌贴加固。
Fiber composite materials are widely used in the field of building structural reinforcement. The traditional CFRP reinforcement method is usually externally sticking CFRP,which is prone to peeling damage,easy to wear and corrosion,etc.,and the embedded reinforcement method can well avoid the external decoration method.The embedded CFRP reinforcement method mainly has two kinds of reinforcement methods,one is to slot the bottom surface and the other is to be grooved on the side for reinforcement. In this paper,the flexural behavior of the reinforced concrete beams embedded with CFRP panels and the bottom-mounted and bottom-mounted CFRP panels were tested. The bearing capacity and mid-span deflection of the specimens were compared between the two panels in the same reinforcement. The effect of crack development and comparative analysis of the side and bottom reinforcement were investigated. The test results show that both kinds of reinforcement methods can significantly improve the bearing capacity and rigidity of the reinforced beam. And,for the yield load,ultimate load and crack development,the side splicing reinforcement is close to the reinforcement effect of the bottom splicing reinforcement in all aspects. Although the bearing capacity is slightly inferior,the gap is small,the construction convenience,applicability and durability are better,and the bottom panel can be replaced under many conditions.
Fiber composite materials are widely used in the field of building structural reinforcement. The traditional CFRP reinforcement method is usually externally sticking CFRP,which is prone to peeling damage,easy to wear and corrosion,etc.,and the embedded reinforcement method can well avoid the external decoration method.The embedded CFRP reinforcement method mainly has two kinds of reinforcement methods,one is to slot the bottom surface and the other is to be grooved on the side for reinforcement. In this paper,the flexural behavior of the reinforced concrete beams embedded with CFRP panels and the bottom-mounted and bottom-mounted CFRP panels were tested. The bearing capacity and mid-span deflection of the specimens were compared between the two panels in the same reinforcement. The effect of crack development and comparative analysis of the side and bottom reinforcement were investigated. The test results show that both kinds of reinforcement methods can significantly improve the bearing capacity and rigidity of the reinforced beam. And,for the yield load,ultimate load and crack development,the side splicing reinforcement is close to the reinforcement effect of the bottom splicing reinforcement in all aspects. Although the bearing capacity is slightly inferior,the gap is small,the construction convenience,applicability and durability are better,and the bottom panel can be replaced under many conditions.
引文
[1]张智梅,张振波,黄海涛,等.表层嵌贴CFRP板加固RC梁的抗弯性能[J].上海大学学报(自然科学版),2017,23(2):298-307.
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[9]曾鹏跃.FRP侧贴与底贴加固钢筋混凝土梁对比分析[J].工程建设,2014,46(6):13-16.
[10]江世永,蔡涛,姚未来,等.粘贴CFRP板加固钢筋混凝土梁的长期变形性能试验研究与数值模拟[J].玻璃钢/复合材料,2018(6):28-33.
[11]梁金福,燕柳斌,赵君君.碳纤维板条嵌入式加固钢筋混凝土梁试验研究[J].混凝土,2009(1):46-49.
[12]杨佳,王连广.内嵌CFRP板条加固超载损伤钢筋混凝土梁试验研究[J].东北大学学报(自然科学版),2018,39(6):907-912.
[2]苏鹏,李恒,丑佳璇,等.表层嵌贴预应力CFRP板条加固钢筋混凝土梁的应力传递行为[J].土木建筑与环境工程,2017,39(1):68-76.
[3]童谷生,蔡少杰.表层嵌贴FRP-混凝土黏结加固研究进展[J].混凝土,2014(12):156-160.
[4]夏立鹏,郑愚,蒋良圣,等.表层嵌贴FRP筋材加固钢筋混凝土梁受力性能研究[J].建筑结构,2017,47(21):90-95.
[5]刘凌云.混凝土结构加固技术研究及工程实践[D].郑州:郑州大学,2010.
[6]Sebastian W M.Sensitivities of strength and ductility of plated reinforced concrete sections to preexisting strains[J].Journal of structural engineering,2002,128(5):624-635.
[7]Guide for the Design and Construction of Concrete Structure Reinforced with FRP Bars:ACI Committee 440[S].Detroit,Michigan:American Concrete Institute,May,2006.
[8]邓朗妮.侧贴预应力CFRP板加固混凝土梁抗弯性能的试验研究[J].中国铁道科学,2010,31(5):28-34.
[9]曾鹏跃.FRP侧贴与底贴加固钢筋混凝土梁对比分析[J].工程建设,2014,46(6):13-16.
[10]江世永,蔡涛,姚未来,等.粘贴CFRP板加固钢筋混凝土梁的长期变形性能试验研究与数值模拟[J].玻璃钢/复合材料,2018(6):28-33.
[11]梁金福,燕柳斌,赵君君.碳纤维板条嵌入式加固钢筋混凝土梁试验研究[J].混凝土,2009(1):46-49.
[12]杨佳,王连广.内嵌CFRP板条加固超载损伤钢筋混凝土梁试验研究[J].东北大学学报(自然科学版),2018,39(6):907-912.