外包钢加固既有RC框架梁端开孔的数值模拟  

Numerical simulation of opening at the beam end in existing RC framestructure reinforced with steel cladding

作　　者：杨旭 彭剑锋 高怡 吴涛[1] 胡钢 YANG Xu;PENG Jianfeng;GAO Yi;WU Tao;HU Gang(College of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《四川建材》2023年第11期28-30,33,共4页Sichuan Building Materials

摘　　要：为了研究既有钢筋混凝土框架梁端开孔后受力的变化与孔周加固的方法,对未开孔、梁端开孔、梁端开孔外包钢加固3个中节点进行建模分析,研究梁端开孔对节点滞回性能、抗侧刚度、耗能能力等抗震性能的影响以及寻求合理的外包钢加固构造。研究结果表明:①开孔削弱了梁截面,节点梁端塑性铰区域外移,试件极限承载力降低、抗侧刚度下降,耗能能力增强;②孔周外包钢加固有效补强了梁上开孔对构件截面的削弱影响,使梁端开孔试件极限承载力、滞回曲线接近未开孔试件相同性能。In order to study the change of the force after the opening of the beam end of the existing reinforced concrete frame and the method of reinforcement around the hole,this paper,conducts modeling analysis on the three Intermediate joints with no opening,opening at the end of the beam,the opening of the beam end is reinforced with steel cladding.The influence of the hole opening at the beam end on the seismic performance of joints such as hysteretic performance,lateral stiffness and energy dissipation capacity is studied.The results show that:①the section of the beam is weakened by the opening,and the plastic hinge area at the end of the joint beam moves outward.The ultimate bearing capacity of the specimen decreases,the lateral stiffness decreases,and the energy dissipation capacity increases;②The reinforcement of steel wrapped around the hole effectively reinforced the weakening effect of the holes on the beam section,making the ultimate bearing capacity and hysteretic curve of the specimens with holes at the beam end close to the same performance of the specimens without holes.

关 键 词：梁柱节点 梁端后开孔洞 外包钢加固 抗震性能 数值模拟 

分 类 号：TU375[建筑科学—结构工程]