碳纤维增强塑料在п梁中的断裂特性分析  

Analysis on Fracture Characteristics of Carbon Fiber Reinforced Plastic in п Beam

作　　者：刘可定[1] 王军[2] 曹平[3] 周军[1] Liu Keding;Wang Jun;Cao Ping;Zhou Jun(Hunan Urban Construction College,Xiangtan 411101,China;Hunan Institute of Engineering,Xiangtan 411104,China;Central South University,Changsha 410083,China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101 [2]湖南工程学院,湖南湘潭411104 [3]中南大学,湖南长沙410083

出　　处：《塑料科技》2018年第12期48-51,共4页Plastics Science and Technology

基　　金：国家自然科学基金资助项目(51174228);湖南省自然科学基金资助项目(2015JJ4019);湖南省教育厅资助科研项目(17C0283)

摘　　要：针对混凝土梁的断裂和п梁承载特性,分析了拉剪应力作用下,梁中翼型裂纹的成核、起裂、扩展和贯通模式,得到了复合应力条件下应力强度因子解析式。通过室内实验和数值实验表明,碳纤维增强塑料(CFRP)对梁的裂纹扩展具有明显的抑制作用,能减小梁的位移,调整梁的应力分布,增强梁的弹性模量和承载力,同时受荷梁的塑性区也得到了改善,且分布范围逐渐缩小,对混凝土加固工程具有有利影响,进而核验了CFRP加固混凝土梁的实用性。Aiming at the fracture of concrete beams and the bearing characteristics of beams, the crack nucleation, initiation, propagation and penetration modes of airfoil cracks under tensile and shear stresses are analyzed, and the analytical expressions of stress intensity factors under composite stresses are obtained. Through indoor experiments and numerical experiments, carbon fiber reinforced plastic(CFRP) has obvious inhibitory eff ect on the crack expansion of the beam, can reduce the displacement of the beam, adjust the stress distribution of the beam, and enhance the elastic modulus and bearing capacity of the beam. At the same time, the plastic area of the bearing beam has also been improved, and the distribution range has been gradually reduced and other favorable eff ects in the concrete reinforcement project, and then the practicality of CFRP reinforcement concrete beam has been verified.

关 键 词：碳纤维增强塑料 断裂特性 混凝土梁加固 强度 

分 类 号：TQ321[化学工程—合成树脂塑料工业]