大直径水泥熟料钢板筒仓稳定性分析

Stability analysis of large diameter steel silos for storage of cement clinker

首先介绍了水泥熟料钢筒仓的应用及几何缺陷对仓壁稳定性的影响,总结了稳定分析采用的焊接缺陷形式.对空仓和满仓两种使用状况,分别对几何完善和包含焊接缺陷的两种钢板仓进行稳定性分析,同时考虑了仓壁开洞及仓壁加劲对稳定性的影响.分析表明,各工况下钢筒仓结构的荷载-位移平衡路径都是高度非线性的,包含焊接缺陷时钢筒仓的稳定承载力降低;仓底洞口的存在,使满仓状态下结构的稳定承载力显著降低,洞口设置加劲肋后可以显著提高结构稳定承载力;仓壁设置加劲肋,尤其是横向加劲肋可显著提高风荷载作用时空仓结构的稳定承载力.

The applications of steel silo in cement clinker and the effect of geometrical imperfection on stability of steel silo wall are firstly introduced. Two types of weld depression imperfections are summarized which are adopted in the numerical analyses. The stability analyses are carried out for geometrically perfect and imperfect models when the silo is either empty or full, and the influences of openings and stiffeners on silo wall are meanwhile taken into account. It is shown that the load- displacement curves of steel silo under all load cases are highly nonlinear, and the weld depression imperfection has detrimental effect on the load carrying capacity of stability of steel silo. The stability bearing capacity of the full silo is obviously decreased by the opening at the bottom, the loss of which could be compensated for by the reinforcement of stiffeners adjacent to the opening. The stiffener on silo wall, especially in the transverse arrangement, can observably improve the stability bearing capacity of the empty silo under wind load.