弹塑性立井井壁设计计算方法研究

Research on the design method of elastoplastic shaft wall

现行的立井壁厚设计法建立在弹性分析基础上。文章研究了混凝土和钢筋混凝土井壁的弹塑性设计方法,得出混凝土井壁弹塑性厚度计算方程和显式计算式。对钢筋混凝土井壁应用荷载分解法,在得出仅由井壁中混凝土体承载的荷载分量pi后,对其作弹塑性分析,得出有关计算方程和计算式。文中还给出全塑性混凝土和钢筋混凝土井壁壁厚计算式。并通过算例说明:与传统的弹性法计算相比,使用弹塑性计算方法得出的壁厚可减薄25%以上。

The current shaft wall thickness design method is based on elastic analysis. In this paper,the elastoplastic design method of concrete and reinforced concrete shaft wall is studied. The equation for calculating the elastoplastic thickness of the concrete shaft wall and the explicit formula are obtained. The applied load decomposition method of reinforced concrete shaft wall is used to analyze the elastic and plastic properties of the reinforced concrete shaft after the load component piis only carried by the concrete body in the shaft wall. The calculation equation and formula are obtained.The calculation of wall thickness of fully plastic concrete and reinforced concrete is also given in this paper. A calculation example is given,and the results show that,using this design method,the shaft wall thickness can be reduced by more than 25% compared with elastic method.