建筑钢结构进展2025，Vol.27Issue(9)：91-100,10.DOI:10.13969/j.jzgjgjz.20240401001
不同加强措施对N形节点疲劳性能影响研究
Study on the Effect of Different Reinforcement Measures on the Fatigue Performance of N-Joint
摘要
Abstract
To clarify the effects of two reinforcement measures—namely,concrete filling in the chord and the arrangement of studs in the chord—on the fatigue performance of N-joints,a four-span through concrete-filled steel tubular(CFST)arch bridge was used as the object of study.A full bridge model was established,and fatigue analyses were conducted to identify the most unfavorable N-joint under stress.Solid finite element models of circular hollow section,CFST,and CFST with studs N-joints were established to compare the stress performance among the three joint types.The mechanisms underlying the differences in fatigue performance of these joints were discussed.Additionally,the optimization of stud arrangement for N-joints of CFST with studs was carried out.The results show that the N-joint finite element analysis model has significant reference value and the calculation results are conservative.The vertical stiffness of the circular hollow section is not the main factor affecting the hot-spot stress distribution;rather,the in-filled concrete is the key factor that changes the hot-spot stress distribution of the circular hollow section N-joint.The effective restriction of radial deformation of the chord by concrete filling effectively alleviates the stress concentration phenomenon caused by insufficient stiffness of the chord.Built-in studs enhance the interaction between the concrete and chord,reducing the hot-spot stress value of the circular hollow section.The most reasonable parameters for stud arrangement is as follows:the stud spacing arrangement rate(τ)is 0.45,the stud diameter rate(β)is 0.026,and the stud length rate(γ)is 0.13.The CFST N-joint with studs demonstrates optimal fatigue performance under different reinforcement measures.关键词
钢管混凝土N形节点/栓钉布置/疲劳性能/热点应力/有限元分析/应力集中Key words
concrete filled steel tubular N-joint/stud arrangement/fatigue performance/hot-spot stress/finite element analysis/stress concentration分类
建筑与水利引用本文复制引用
李德臣,吴庆雄,管锡琨,孙晓洲,韩雨晓,王帅..不同加强措施对N形节点疲劳性能影响研究[J].建筑钢结构进展,2025,27(9):91-100,10.基金项目
国家自然科学基金(52578183、51678154) （52578183、51678154）
