高温贮料作用下钢筒仓稳定性能研究

Stability of steel silos under high temperature stored granular materials

筒仓内装入高温贮料后,作用于仓壁上的贮料荷载会受到高温作用的影响而产生附加温度侧压力.如果仓内存有冷料时,会在新入仓的高温贮料和仓内原有冷贮料间形成竖向温差,因此产生径向位移差.为使竖向温差处仓壁变形连续且协调,该区域的仓壁内力会显著增大.本文对上述高温贮料作用下钢筒仓的稳定性能进行研究.首先分析不同温度工况作用下筒仓上产生的温度侧压力,然后以筒仓下半部分为冷贮料,上半部分为高温贮料考虑竖向温差.在温度侧压力和竖向温差作用下对钢筒仓进行屈曲分析,并探究几何非线性、材料非线性和初始缺陷的影响,最后得出不同参数对筒仓稳定性的影响.研究结论为实际工程设计中考虑高温贮料提供建议.

The loads on vertical walls of silos will be influenced by the hot bulk solids when they are filled into the silo. The thermal lateral pressure should be superposed upon the pressures. When hot bulk solids are placed in a silo, the temperature difference between the cooler solids that have been there for some time and the hot atmosphere above the solids surface should be taken into account. The effect of such temperature difference on the differential expansion of the silo wall at different levels should also be considered, together with the bending moments arising from satisfying compatibility between these deformations. This paper focuses on the two factors that influence the stability of the steel silo. The thermal lateral pressure induced by the hot bulk solids was explored firstly. Then the influence of the thermal lateral pressure and the vertical temperature difference on the buckling behavior was analyzed through five-type buckling analyses. The influences of geometrical nonlinearity, material nonlinearity and initial imperfections on the silo are discussed thoroughly. The conclusion provides suggestion for considering effects of high temperature storage materials on stability of steel silos in practical engineering.