长细比对五螺箍圆形钢筋混凝土柱轴心受压性能的影响
Influence of slenderness on the axial compressive bearing capacity of a five-spiral stirrup for circular reinforced concrete columns
刘成清 1杜成竹 1吴宪洪 1李广1
作者信息
- 1. 西南交通大学 土木工程学院,四川 成都 610031
- 折叠
摘要
为研究长细比对五螺箍圆形钢筋混凝土柱轴心受压性能的影响,本文运用ABAQUS软件建立有限元模型并对其开展了轴心受压的数值模拟,将有限元分析结果与已有文献中的试验结果进行比较以验证模型的合理性.基于经过验证的有限元模型,建立具有初始偏心的不同长径比和直径的构件,对其进行轴心受压有限元分析.结果表明:同一组构件,随着长径比的增大,构件的承载力降低,稳定系数也有所降低,但侧向挠度不断增大,二阶效应的影响也越来越显著;长径比相同时,截面面积的增加能够降低长径比对构件峰值承载力下降程度的影响,构件的稳定系数有所增大.本文根据有限元分析结果,对五螺箍圆形钢筋混凝土柱轴压承载力计算公式进行稳定系数修正并给出稳定系数的取值建议:当五螺箍圆形RC柱的核心区长径比为212时,稳定系数可查表取值,若核心区长径比不为整数,则可采取线性内插法进行取值,也可按稳定系数计算式进行计算.
Abstract
This paper established finite element(FE)models using the ABAQUS software to examine the influ-ence of the slenderness ratio on the axial compressive performance of a five-spiral stirrup for circular reinforced concrete columns,and numerically simulated it under axial compression.We compared the FE analysis results with the experimental results reported previously to validate the rationality of the models.Based on the verified FE models,components having initial eccentricity with different length diameter ratios and diameters were estab-lished,and the FE analysis of their axial compression was conducted.The analysis results revealed that for the same set of components,both the bearing capacity and stability coefficient decreased with the increase of length diameter ratios;however,lateral deflection increased step by step,and the influence of the second-order effect became increasingly significant.At the same length diameter ratio,the influence of length diameter ratio on the decline of peak bearing capacity of the component was reduced with the increase in section area,and the stabili-ty coefficient increased.Thus,we modified the stability coefficient of the calculation formula on the axial com-pressive bearing capacity of the five-spiral stirrup for circular reinforced concrete columns according to the FE analysis results and provided suggestions for the value of the stability coefficient,when the slenderness ratio of the core area of the circular RC column is 212,the stability coefficient can be taken from the table,if the slen-derness ratio of the core area is not an integer,linear interpolation method can be used for value selection,or the stability coefficient calculation formula can be used for calculation.
关键词
长细比/钢筋混凝土柱/五螺箍/承载力/荷载-位移曲线/荷载-侧向挠度曲线/稳定系数/二阶效应Key words
slenderness/reinforced concrete columns/five-spiral stirrup/bearing capacity/load-displacement curves/load-lateral deflection curves/stability coefficient/second order effect引用本文复制引用
基金项目
国家自然科学基金(51778538)
国家留学基金委项目(201707005100)
出版年
2023
国家科技期刊平台
NSTL
维普
万方数据