温度效应和混凝土收缩对单阶柱计算长度系数的影响分析

Analysis of Influence of Temperature Lateral Deformation and Concrete Shrinkage Deformation on Length Coefficient of Single Step Column

对于大体积混凝土结构而言,其计算长度系数受温度效应和混凝土收缩两者的影响很大,在分析计算长度系数时,不能忽略这两种因素的影响。基于此,文中先引入了考虑温度侧向变形Δ和混凝土收缩变形ε_(y)^(0)的独立柱屈曲方程,然后在此基础上,推导出了单阶柱在同时在两者影响下的屈曲方程,最后系统地分析了对计算长度系数μ_(2)的影响。结果表明,当同时考虑温度效应和混凝土收缩时,单阶柱的计算长度系数会增大,且临界力参数η_(1)和线刚度比K_(1)越大或温度侧向变形与混凝土收缩变形之和Δ+ε_(y)^(0)h越大,计算长度系数的差异就越明显。

For large volume concrete structures,the calculated length coefficient is greatly affected by temperature effect and concrete shrinkage,so the influence of these two factors cannot be ignored when analyzing the calculated length coefficient.Based on this,this paper first introduces an independent column buckling equation considering temperature lateral deformationΔand concrete shrinkage deformationε_(y)^(0),then deduces the buckling equation of a single step column under the influence of both,and finally systematically analyzes the influence on the calculation of the length coefficient.The results show that when both temperature effect and concrete shrinkage are considered,the calculated length coefficientμ_(2)of single step column will increase,and the larger the critical force parameterη_(1)and linear stiffness ratio K_(1)or the larger the sum of temperature lateral deformation and concrete shrinkage deformationΔ+ε_(y)^(0)h,the more obvious the difference of calculated length coefficient.