超高强度预应力体系UHPC锚固区局部受力分析  

Analysis of Local Stress in UHPC Anchorage Zone of Ultra⁃high Strength Prestressed System

作　　者：李旺旺 LI Wangwang(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State KeyLaboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2023年第6期64-68,共5页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2021YJ074);中国国家铁路集团有限公司科技研究开发计划(K2021G019)。

摘　　要：为探索超高性能混凝土(Ultra-high Performance Concrete,UHPC)在超高强度预应力体系中的受力性能,建立有限元模型开展超高强度预应力作用下UHPC锚固区局部受压分析。在优化锚垫板形式的基础上,分析间接钢筋配置、局部尺寸、锚孔间距等因素对UHPC锚固区局部受压性能的影响。结果表明:UHPC应用于锚固区后,为了发挥UHPC材料特性和提高结构性能,应提高锚固区受压控制标准。2400 MPa等级预应力锚垫板质量比普通混凝土锚垫板质量减小了65%。减少间接钢筋配筋率和减小局部尺寸后构件主拉应力增大,主压应力和钢垫板塑性应变无显著变化。锚孔间距增大会改变局部受压区受力状态,构件主压应力、主拉应力和钢垫板塑性应变均先减小后增大。In order to explore the mechanical behavior of ultra-high performance concrete(UHPC)in ultra-high strength prestressed systems,an analysis of local compression in the anchorage zone of UHPC under ultra-high strength prestressing was conducted.On the basis of optimizing the form of anchor plate,the effects of indirect reinforcement configuration,local size,anchor hole spacing,and other factors on the local compression performance of UHPC anchor zone were analyzed.The results show that after UHPC is applied to the anchorage zone,the pressure control standard of the anchorage zone can be improved in order to exert the material characteristics of UHPC and improve the structural performance.The mass of the 2400 MPa grade prestressed anchor plate is reduced by 65%compared to ordinary concrete anchor plate.After reducing the indirect reinforcement ratio and local size,the main tensile stress of the component increases,but the main compressive stress and the plastic strain of the steel backing plate have no significant changes.Increasing the spacing of anchor holes will change the stress state of the local compression zone,and the main compressive stress,tensile stress,and plastic strain of the steel backing plate of the component first decrease and then increase.

关 键 词：铁路桥梁 超高强度 超高性能混凝土 有限元分析 锚固区 局部受压 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]