CFRP板加固既有石楼板抗弯性能试验研究  

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF EXISTING STONE SLABS STRENGTHENED BY CFRP PLATE

作　　者：张丰宇 何佰昭 吴应雄[1] 金捷 陈伟恩 ZHANG Feng-yu;HE Bai-zhao;WU Ying-xiong;JIN Jie;CHEN Wei-en(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Fujian Provincial Department of housing and urban rural development,Fuzhou,Fujian 350025,China;Fujian Provincial institute of Architectural Design and Research Co.Ltd.,Fuzhou,Fujian 350000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省住房和城乡建设厅,福建福州350025 [3]福建省建筑设计研究院有限公司,福建福州350000

出　　处：《工程力学》2024年第12期138-149,共12页Engineering Mechanics

基　　金：福建省住房和城乡建设厅科技研究开发项目(2022-K-118)。

摘　　要：为改善既有石结构中石楼板的抗弯性能,避免其发生脆性断裂,提出了采用CFRP板加固技术对石楼板进行抗弯加固,并对未加固的素石板和CFRP板加固后的石楼板进行受弯试验,对比不同厚度及宽度CFRP板对石板受弯性能的影响。结果表明:利用CFRP板加固石板能够显著改善石楼板的最终破坏形态,破坏形式由素石板的脆性断裂转变为CFRP板加固后石板的弯曲破坏,CFRP板加固石板在破坏前具有一定的变形能力;CFRP板能够显著提升石楼板的抗弯承载能力,CFRP板加固石板的极限荷载较素石板提升了60.15%~128.59%,且CFRP板的加固效果随着CFRP板的厚度及宽度增大而提高;CFRP板能有效阻碍石楼板板底裂缝的产生,提高了石材的极限拉应变,从而增大石楼板的开裂荷载。受拉区石材的极限拉应变随着CFRP板厚度和宽度的增大,提升了66.92%~187.48%,CFRP板加固石板的开裂荷载较素石板提升了13.33%~54.07%;通过理论计算,建立了CFRP板加固石楼板的受弯承载力计算公式,理论计算结果与试验结果符合较好。To improve the bending performance of existing stone slabs and prevent brittle fractures,this study proposes the use of CFRP plate reinforcement technology for bending enhancement.Bending tests were conducted on both unreinforced stone slabs and CFRP-reinforced stone slabs,comparing the effects of different CFRP plate thicknesses and widths on their bending performance.The results show that reinforcing stone slabs with CFRP plates significantly improves their final failure mode,transforming the brittle fracture of unreinforced slabs into bending failure with deformation capacity in CFRP-reinforced slabs.The CFRP plates substantially enhance the bending load-bearing capacity of the stone slabs,increasing the ultimate load by 60.15%to 128.59%compared to unreinforced slabs,with reinforcement effectiveness improving as the thickness and width of the CFRP plates increase.Moreover,CFRP plates effectively inhibit the formation of cracks at the bottom of the slabs,raising the ultimate tensile strain of the stone material and increasing the cracking load.The ultimate tensile strain of the stone in the tensile zone improves by 66.92%to 187.48%as the thickness and width of the CFRP plates increase,while the cracking load of CFRP-reinforced slabs rises by 13.33%to 54.07%compared to unreinforced slabs.A theoretical calculation formula for the bending load-bearing capacity of CFRP-reinforced stone slabs was established,with the theoretical results showing good agreement with the experimental data.

关 键 词：石结构 石楼板 CFRP板 抗弯加固 受弯性能 

分 类 号：TU363[建筑科学—结构工程]