斜腹杆体外预应力加固混凝土简支梁受力性能分析  

THE ANALYSIS OF MECHANICAL BEHAVIOR OF EXTERNAL PRESTRESS CONCRETE SIMPLY SUPPORTED BEAM STRENGTHENED BY TILTED BELLY POLES

作　　者：何永利 高旭东 HE Yongli;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》2022年第10期103-106,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：文中以斜腹杆体外预应力技术加固的简支梁为研究对象,应用力法建立了体外索索端张力增量与跨中位移变形的关系式以及外荷载与体外预应力加固后梁的跨中位移的关系式。通过ABAQUS建立了有限元模型以及组织了3组试验,对理论分析和数值模拟的结果进行验证,研究表明理论结果和试验结果与模拟结果在弹性阶段基本吻合,表明理论推导的体外索内力增量公式和外荷载作用下梁跨中位移表达式可靠,能用于工程实践。Taking a simply supported beam strengthened by external prestressing with diagonal web members as the research object, the relationship between the tension increment of external cable end and the mid span displacement, and the relationship between external load and the mid span displacement of the beam strengthened by external prestressing are established by force method. The finite element model was established through ABAQUS and three groups of tests were organized to verify the results of theoretical analysis and numerical simulation. The research shows that the theoretical results, test results, and simulation results are basically consistent in the elastic stage, indicating that the incremental formula of external cable internal force and the expression of mid span displacement under external load derived from the theory are reliable.

关 键 词：混凝土结构 简支梁 体外预应力 斜腹杆 

分 类 号：TU311[建筑科学—结构工程]