摘要
目的模拟不同加固方式对钢筋混凝土框架梁柱节点力学性能的影响,找出合理的加固方案,进而提高结构耐久性.方法以核心区少配箍筋的框架十字型节点为研究对象,采用增大柱截面与碳粘贴碳纤维复合的加固方法来实现对钢筋混凝土框架梁柱节点的加固,利用ABAQUS有限元软件进行数值模拟.结果增大柱截面加固节点极限承载力平均提高92%,延性平均提高34%,刚度平均提高4%;碳纤维布加固节点,极限承载力平均提高44%,延性平均提高55%,刚度平均提高67%;增大柱截面与碳纤维复合加固节点极限承载力平均提高157%,延性平均提高86%,刚度平均提高79%.结论不同加固方案改变了试件的破坏形态,由脆性破坏变为延性破坏,破坏点均发生在梁端.相比增大柱截面方法加固节点和碳纤维加固节点方法,采用增大柱截面与碳纤维复合加固的方法对试件极限承载力、延性、刚度都提高显著.
Mechanical properties of RC frame joints reinforced with different ways were simulated in this paper to find the reasonable solution reinforcement and improve structure durability. Taking frame cross nodes with less stirrup on the core area as research objects,by enlarging column section with bonding carbon fiber,reinforced concrete frame beam-column joints were built and simulated with the FE softw are ABAQUS. It was found that for concrete frame beam-column joints re-inforced only with enlarging column section,the ultimate bearing capacity was averagely increased by 92%. the ductility was increased by 34%,the stiffness was increased by 4%; for joints reinforced only with bonding carbon fiber,the ultimate bearing capacity was averagely increased by44%,the ductility was increased by 55%,the stiffness was increased by 67%; for reinforced joints by enlarging the column section with bonding carbon fiber,the ultimate bearing capacity increased by 157%,the ductility was increased by 86%,and the stiffness was increased by 79%. Conclusion was that compared the joints reinforced only with enlarging column section and the joints reinforced only with bonding CFRP,the ultimate bearing capacity,the ductility and rigidity of the joints reinforced by enlarging column section with bonding CFRP were significantly increased.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2016年第1期69-79,共11页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51178275)
关键词
框架节点
复合加固
增大柱截面
碳纤维
有限元
承载力
frame node
composite reinforcement
enlarging column section
bond carbon fiber
finite element
bearing capacity
