钢筋混凝土曲线梁桥体外预应力加固研究  

Study on Externally Prestressed Reinforcement of Reinforced Concrete Curved Beam Bridge

作　　者：金春福[1] 钮鹏[2] 郭宏浩[2] 薛坤鹏[2] 

机构地区：[1]辽宁省交通高等专科学校,沈阳110122 [2]沈阳大学建筑工程学院,110044

出　　处：《混凝土与水泥制品》2016年第6期45-49,共5页China Concrete and Cement Products

基　　金：辽宁省博士启动基金(20131050);辽宁省博士启动基金(20141092);辽宁省交通高等专科学校优秀人才成长计划(2015lnccrchy02);辽宁省高等学校优秀人才支持计划项目(LJQ2015076)

摘　　要：为研究钢筋混凝土曲线梁桥体外预应力加固效果,对加固前后的钢筋混凝土曲线梁进行了破坏试验,分析了加固前后曲线梁的变形特征、破坏形态及极限承载力,并以试验研究为基础,采用ANSYS有限元软件建立了非线性模型,分析了影响钢筋混凝土曲线梁体外预应力加固效果的主要参数。结果表明,加固后曲线梁破坏形态属于延性破坏,极限承载力提高了14.6%。钢筋混凝土曲线梁采用体外预应力加固,效果显著,体外预应力筋的平面内线形越接近加固梁曲线,加固效果越好,预应力筋偏心距越大体外预应力筋越能得到充分发挥;随着有效预应力的增大,曲线梁的延性降低。For studying strengthening effect of reinforced concrete （RC） curved bridge by using externally prestressed reinforcement, the some destructive tests for the RC curved beams for both the strengthened and unstrengthened are carried out. The deformation characteristics, the failure pattern and the ultimate bearing capacity of the curved beam are mainly analyzed. Based on the experimental study, the nonlinear finite element model is established by the software ANSYS, and the main parameters which influence the RC curved beam with the externally prestressed reinforcement are analyzed. The failure mode of the reinforced curved beam is ductile failure, and the ultimate bearing capacity increases 14.6%. The results show that the reinforcement effect for the RC curved beam with the externally prestressed reinforcement is remarkable.The layout of the external prestressing tendon is closer the shape of the curved beam, the better effect can be gotten. The eccentricity of the prestressing tendon is greater, the higher strength of prestressed reinforcement obtains. And the ductility of the curved beam decreases with the increase of the effective prestress.

关 键 词：钢筋混凝土曲线梁 体外预应力加固 ANSYS有限元分析 参数分析 极限承载力 非线性有限元模型 

分 类 号：TU448.34[建筑科学—岩土工程]