预应力加固框架梁对节点抗震性能分析  

SEISMIC RESISTANCE PERFORMANCE OF PRESTRESSED REINFORCED FRAME BEAMS ON JOINTS

作　　者：何永利 陶淑娟 高旭东 HE Yongli;TAO Shujuan;GAO Xudong(Baiyin Vocational College of Mining And Metalurgy,Gansu Baiyin 730900,China;Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]白银矿冶职业技术学院,甘肃白银730900 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《低温建筑技术》2024年第3期99-102,共4页Low Temperature Architecture Technology

基　　金：甘肃省教育厅创新基金项目(2022B-530)。

摘　　要：为研究预应力加固混凝土框架梁后框架节点的抗震性能变化,文中以框架节点为研究对象,应用位移法分析斜腹杆体外预应力技术加固混凝土框架梁后框架节点的受力情况,通过ABAQUS建立有限元模型以及组织一个三层两跨的试验框架模型,对数值模拟的结果进行验证。研究表明ABAQUS建立的有限元模型可以用于斜腹杆体外预应力加固框架梁节点的抗震性能分析,相比于未加固框架,在竖向荷载作用下,节点区域钢筋应力相对减小,节点极限抗剪能力提高;在水平荷载作用下,加固框架比未加固框架混凝土受压损伤严重,尤其梁端比未加固框架延伸更多,对框架节点抗震不利,故应采用相应技术对节点进行加固,为斜腹杆体外预应力整体加固提供理论依据。The frame joints are taken to study the seismic performance of the frame joints after the prestressed rein⁃forced concrete frame beams.The displacement method is applied to analyze the stress situation of frame nodes after strengthening concrete frame beams with external prestressing technology of diagonal web members.A finite element model is established through ABAQUS,and a three story and two span experimental frame model is organized to veri⁃fy the numerical simulation results.The results show that the finite element model established by ABAQUS can be used for seismic performance analysis of frame beam nodes strengthened with external prestressing of diagonal web members.Under the action of vertical load,the reinforcement stress in the joint area is relatively reduced,and the ul⁃timate shear resistance of the joint is improved.Under the action of horizontal load,the concrete of the reinforced frame is seriously damaged by compression compared with the unreinforced frame,especially the beam end extends more than that of the unreinforced frame,which is not conducive to the seismic resistance of the frame joint.There⁃fore,corresponding technologies should be used to reinforce the node,providing a theoretical basis for the overall re⁃inforcement of the diagonal member with external prestressing.

关 键 词：混凝土结构 框架节点 体外预应力 斜腹杆 

分 类 号：TU375.4[建筑科学—结构工程]