建筑钢结构进展2025，Vol.27Issue(5)：29-39,11.DOI:10.13969/j.jzgjgjz.20231120001
考虑黏结滑移的型钢超高性能混凝土组合梁受力性能影响因素分析
Analysis of Factors Affecting the Mechanical Performance of Steel Reinforced Ultra-High Performance Concrete Beams Considering the Bond-Slip Effect
摘要
Abstract
The application of ultra-high performance concrete(UHPC)to steel reinforced concrete structures can improve the load carrying capacity,reduce the cross-section size,and solve the problems of complex construction caused by the intensive configuration of stirrups and shear members.The current finite element simulation study of steel reinforced UHPC beams is mainly a parametric qualitative study of bending capacity,ignoring the bond-slip effect between steel and UHPC,which lacks the assessment of its interfacial bond performance and combination effect,as well as the in-depth discussion of the stress performance of the UHPC in tensile zone.In this paper,the finite element simulation analysis of the bending performance of steel reinforced UHPC beams was carried out based on ABAQUS,and the strength of UHPC,the strength of steel,the longitudinal reinforcement ratio and the steel ratio were parametrically investigated.The load-mid-span deflection curves,cross-section strain distribution,interface bond stress distribution,and tensile zone performance of the UHPC were analyzed.The main conclusions are as follows:(1)The loading process of the composite beam can be divided into four stages:the fully elastic stage,the damaged working stage,the plastic hardening stage,and the ductility development stage.(2)The UHPC in the tensile zone can still participate in the section bending resistance at the peak load,and suggestions for the value of the equivalent stress reduction factor for the tensile zone of UHPC are proposed based on parametric research.(3)The bond stress of the upper flange is mainly concentrated at the loading area,while the distribution of the bond stress on the lower flange is controlled by the development of cracks.The bond performance between the steel section and UHPC at the interface should be improved in the design by means of shear connectors or surface treatment of the steel profiles.(4)During the design process of composite beams,the strength and configuration rate of the steel profiles should be limited to ensure that the composite beams have good ductility and the UHPC in tensile zone exhibits good load-bearing performance.关键词
型钢混凝土组合结构/超高性能混凝土/黏结滑移/有限元分析/等效应力折减系数Key words
steel reinforced concrete structure/ultra-high performance concrete/bond-slip/finite element analysis/equivalent stress reduction factor分类
建筑与水利引用本文复制引用
沈德建,白松林,姜国庆,刘慈,李明..考虑黏结滑移的型钢超高性能混凝土组合梁受力性能影响因素分析[J].建筑钢结构进展,2025,27(5):29-39,11.基金项目
国家杰出青年科学基金(52425905),新疆兵团科技计划项目(2023AB016-01),江苏省住房和城乡建设厅科技项目(2022ZD076) （52425905）
