工字型截面齐次广义屈服函数与薄壁结构极限承载力

发布时间：2018-01-02 22:42

本文关键词：工字型截面齐次广义屈服函数与薄壁结构极限承载力　出处：《应用基础与工程科学学报》2015年05期 　论文类型：期刊论文

【摘要】：基于传统广义屈服函数的弹性模量缩减法应用于薄壁结构极限承载力分析时,往往出现计算结果不稳定、精度较低等问题.为此通过理论分析探索了问题的根源,研究建立了工字型截面的齐次广义屈服函数,提出了回归分析的配点遴选原则,通过误差分析确定了齐次多项式的幂次数;根据工字型截面齐次广义屈服函数定义了薄壁构件的单元承载比,利用单元承载比特征分布参数定义了承载比均匀度和基准承载比,为薄壁结构高承载单元的判别提供了动态判据,进而依据变形能守恒原则建立了自适应弹性模量调整策略,建立了工字型薄壁结构极限承载力分析的弹性模量缩减法.算例分析表明,本文方法能准确考虑组合内力对工字型薄壁结构极限承载力的综合影响,得到具有良好稳定性和计算精度的结果.
[Abstract]:Based on the elastic modulus of the traditional generalized yield function reduction method is applied to the ultimate bearing capacity analysis of thin-walled structures, the calculation results are often not stable, the precision is low. Therefore through theoretical analysis to explore the root of the problem, research has established the I-shaped Qi Ciguang yield function is proposed with the regression analysis of the selection principle the power frequency homogeneous polynomial by error analysis; according to the I-shaped cross section of homogeneous generalized yield function defines the thin-walled member element bearing ratio, bearing ratio distribution parameters define the bearing ratio uniformity and bearing ratio using the reference unit, provides a dynamic criterion for distinguishing the thin-walled structure of high bearing unit, and then on the basis of deformation energy conservation principle and established the adaptive adjustment strategy of elastic modulus, elastic modulus up limit I-section thin-walled structure analysis of bearing capacity reduction method. Example analysis shows that the method can accurately consider the combined influence of combined internal force on the ultimate bearing capacity of thin-walled structure, and get the results of good stability and accuracy.

【作者单位】：广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室;福建省建筑科学研究院;南宁市建筑设计院;
【基金】：国家自然科学基金项目(51168003;51169003) 广西自治区主席科技资金项目(2010GXNSFD169008) 广西自然科学基金重大项目(2012GXNSFEA053002)
【分类号】：TU392.1
【正文快照】： 薄壁结构具有自重轻、材料省和结构形式简单等优点,适用于土木、水利和交通工程的承重结构体系.工字型截面是薄壁结构经常采用的构件截面之一,已广泛应用于各类承重梁系结构、框架结构、巷道支架和矿用支架等结构中,其极限承载能力对整个工程的安全运行起着关键作用.鉴于此,工

【参考文献】