粘贴钢板加固竖向开裂T梁加固效果评价  

EVALUATION OF REINFORCING EFFECT OF BONDED STEEL PLATES ON PRESTRESSED CONCRETE T BEAMS WITH VERTICAL CRACKS

作　　者：傅鹏飞 邓旭东 郭荣鑫[1,2,3] 王越 张世博 FU Peng-fei;DENG Xu-dong;GUO Rong-xin;WANG Yue;ZHANG Shi-bo(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,650500,Kunming,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,650500,Kunming,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,650500,Kunming,China;Research Institute of Highway Science&Technology of Yunman Province,650051,Kunming,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省土木工程防灾重点实验室,昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,昆明650500 [4]云南省公路科学技术研究院,昆明650051

出　　处：《建筑技术》2024年第3期318-321,共4页Architecture Technology

基　　金：云南省交通运输厅科技创新及示范项目(2022–48)。

摘　　要：为研究粘贴钢板对竖向开裂预应力混凝土T梁的加固效果,通过破坏性试验研究2片20 m预应力混凝土竖向开裂T梁的受力性能。分别从裂缝、位移、应变等方面对加固效果进行评价。结果表明:竖向开裂T梁的结构安全储备不足,但相比于未加固梁,通过粘贴钢板加固,开裂后的刚度提升了33.2%,屈服荷载和极限承载力分别提升了34.7%、52.9%;减少了33.7%的裂缝产生与扩展;并且在混凝土进入软化阶段前,钢板与结构的协同受力能力优异。可见,粘贴钢板加固预应力混凝土竖向开裂T梁的加固效果优异。In order to investigate the reinforcing effect of bonded steel plates on prestressed concrete T beams with vertical cracks,destructive testing was used to investigate the structural performance of two 20-meter-long prestressed concrete T beams with vertical cracks.This investigation encompassed the evaluation of cracks,displacements,strains,and related parameters.The results show that the vertically cracked T beams lacked a sufficient structural safety margin.Nevertheless,when compared to unreinforced beams,the application of bonded steel plates resulted in a notable enhancement in post-cracking stiffness by 33.2%,significant increases in both yield load and ultimate load capacity by 34.7%and 52.9%,respectively,and a reduction in crack initiation and propagation by 33.7%.Furthermore,it was observed that the steel plates exhibited exceptional load-sharing capabilities with the structure before the concrete began to soften.Therefore,it is concluded that the reinforcing effect of bonded steel plates on prestressed concrete T beams with vertical cracks is of great significance.

关 键 词：预应力混凝土T梁 竖向开裂 粘贴钢板加固 加固效果评价 

分 类 号：TU446[建筑科学—岩土工程]