结构工程师2025，Vol.41Issue(3)：53-61,9.DOI:10.15935/j.cnki.jggcs.202503.0006
钢筋混凝土压弯构件的实用疲劳计算方法研究
Research on Practical Fatigue Analysis Method of Reinforced Concrete Compression-Bending Members
程卫红 1胡文松 1时言1
作者信息
- 1. 中国建筑科学研究院有限公司,北京 100013||国家建筑工程技术研究中心,北京 100013
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摘要
Abstract
To study the fatigue property of reinforced concrete(RC)compression-bending members,on the basis of combing the fatigue analysis method of RC bending members in the current codes,this paper deduces the practical fatigue calculation method of RC compression-bending members based on plane section assumption and the conversion cross-section method.Based on the fatigue analysis method proposed in this paper,the necessity of fatigue calculation of compression-bending components is illustrated by engineering examples.The influence of axial pressure,tensile reinforcement area,concrete strength grade on fatigue calculation results is studied.The influence of fatigue load on structural deflection is studied.The results show that for reinforced concrete compression-bending members,the stress amplitude of steel bar in the tension zone and the maximum stress of concrete fiber at the edge of the compression zone will be significantly overestimated according to the fatigue calculation method of RC bending members.When the bending moment of the section is fixed,the increase of the axial force of the section can effectively reduce the fatigue stress of the tensile steel bars and increase the fatigue stress amplitude limit of the steel bar,but it has no effect on the fatigue stress amplitude of the tensile steel bars.Fatigue stress can be effectively reduced by increasing the area of tensile bars,while the area of the compression bars and the strength grade of concrete have no effect on fatigue stress.The influence coefficient of deflection increase considering the long-term effect of load in concrete specification cannot fully reflect the influence of long-term fatigue load.关键词
钢筋混凝土/压弯构件/疲劳计算/轴压力/钢筋应力幅/疲劳应力Key words
Reinforced concrete/compression-bending members/fatigue analysis/axial force/fatigue stress amplitude/fatigue stress分类
建筑与水利引用本文复制引用
程卫红,胡文松,时言..钢筋混凝土压弯构件的实用疲劳计算方法研究[J].结构工程师,2025,41(3):53-61,9.
