水平圆柱薄壳非轴对称载荷作用内力分析

FORCE ANALYSIS OF THIN-WALLED HORIZONTAL CIRCULAR CYLINDRICAL SHELL UNDER NON-AXISYMMETRIC LOADING

近年来大直径圆柱形薄壳结构烟风煤粉管道的使用呈增长趋势.水平圆柱薄壳在非轴对称载荷作用下的内力常按整体梁理论或壳的无矩理论计算,无法反映载荷作用边界的弯曲应力.本文结合圆柱壳的无矩理论和弯矩理论,得到了简支水平圆柱薄壳在任意高度内部积灰(粉)、风、雪、自重、地震作用下的内力解析解,且理论解与三维有限元分析结果非常接近.研究结果可推广到类似的非轴对称变形圆柱壳,并为水平薄壁圆柱壳结构设计提供依据.

There has been a continuous growth for applying large diameter horizontal thin-walled circular cylindrical shell(HTCCS) for air and flue gas ducts, raw coal or pulverized coal piping. HTCCS under nonaxisymmetric loading is usually designed according to the membrane theory or global beam theory, which is inadequate to capture the bending and shear stresses in the shell located near the load edges. In this paper,the total internal forces in a thin HTCCS under ashes, snow, wind, gravity or seismic loads are determined from the combined membrane and moment theories. The exact solutions obtained complies with the results of finite element analysis. These study results can be extended to the design of HTCCS subjected to similar non-axisymmetric loading.