预应力混凝土箱梁底板锚固块构造与受力性能  

Analysis of Layout and Static Behavior of Anchor Zone in Prestressed Concrete Box Girder

作　　者：许瑾 

机构地区：[1]上海建峰职业技术学院土木工程系,上海201900

出　　处：《土木工程与管理学报》2016年第3期68-72,79,共6页Journal of Civil Engineering and Management

摘　　要：为了揭示不同构造预应力混凝土箱梁底板锚固块在不同预应力钢束根数作用下受力性能,对几座典型大跨度预应力混凝土箱梁底板锚固块构造进行统计,并通过有限元软件对不同构造的锚固块进行了模拟;分析了锚固块受到预应力筋作用时相应区域混凝土的受力性能;参数化分析了影响锚固块受力性能的因素;对不同预应力束数对应的箱梁底板上、下缘进行配筋,并根据规范进行验算。得到预应力混凝土箱梁底板锚固块张拉预应力钢束时的受力特点,确定了影响锚固块受力性能的关键因素,并给出了合理的底板锚固区配筋形式,可为设计计算同类桥梁的底板锚固块构造提供参考。In order to reveal the mechanical behavior of anchor zone located in the bottom slab of prestressed concrete box girders under the effect of different amount of prestressed steel strands,we analyzed the structure of bottom slab anchor zone of several typical large-span prestressed concrete box girder bridges,and simulated anchor zones with different structures by using finite element software.By studying the mechanical behavior of corresponding region＇s concrete while anchor zone was under the effect of prestressed steel strand,conducting parametric analysis to the influential factors of anchor zone＇s mechanical behavior,designing reinforcement for the upper and lower edge of box girder bottom slab corresponding to different amount of prestressed steel strands and doing some checking computations according to code,this paper summarized the mechanical behavior of anchor zone in the bottom slab of prestressed concrete box girder while the prestressed steel strand was tensioning,defined the key factors affecting anchor zone＇s mechanical performance and provided a reasonable reinforcement scheme for the bottom slab,thus offering a reference for designing and calculating the anchor zone structure of similar bridges.

关 键 词：预应力混凝土箱梁 锚固块 有限元 受力特点 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]