钢筋混凝土圆形地下粮仓仓壁承载力计算方法研究

STUDY ON WALL BEARING CAPACITY CALCULATION METHOD OF REINFORCED CONCRETE UNDERGROUND GRANARY

钢筋混凝土地下粮仓仓壁承受贮料压力、土压力、水压力及结构自重等多种荷载的作用,其承载特性复杂.选取水土压力作用下的空仓状态作为最不利受力条件,分别采用下端固定、上端简支圆柱壳模型分析法和有限元分析法计算仓壁承载力.基于这两种方法的计算结果,研究钢筋混凝土圆形地下粮仓仓壁承载特性,分析仓壁竖向弯矩和环向力分布规律.结果表明:钢筋混凝土地下粮仓仓壁与仓顶、仓底连接处因边缘约束效应的影响,受力状况比较复杂,建议采用有限元分析法对其进行结构计算分析.

The wall of a reinforced concrete underground granary is under the action of various loads,including pressure of stored materials, soil, and water, deadweight and so on, so that the wall has complex bearing characteristics. Selecting an empty underground granary under water and soil pressures as the most adverse condition,we calculated the wall bearing capacity by cylindrical shell model with a fixed lower and a simply supported upper and finite element analysis method. We studied the wall bearing characteristics of the reinforced concrete underground granary,and analyzed vertical bending moment and circumferential force distribution rule of the wall based on the calculation results of the above two methods. The results showed that the force conditions at the junctions between the wall and the top and between the wall and the bottom of the reinforced concrete underground granary were complex because of the edge constraint effect;and we recommend finite element analysis method as the proper method.