考虑横向剪切的双层板架临界载荷计算

本文考虑横向剪切效应，建立了一种计算双层板架结构临界载荷的方法：将复杂的双层板架结构从其相邻结构中分离出来，用弹性约束计及相邻结构的影响，用正交异性板的方法描述其力学特性，用能量法求解双层板架结构临界载荷。结果表明该方法可靠，尤其适合在工程方案的论证阶段应用。

A METHOD FOR CALCULATING BULKLING STRESS OF DOUBLE WALL GRILLAGE INCLUDING INFLUENCE OF TRANSVERSE SHEAR DEFORMATION

Most of the traditional methods for calculating the bulkling stress of the grillage ignore the influence of transverse shear deflection. But the transverse shear deflection of double wall grillage is quite large and can not be ignored because its shear stiffness is quite small compared with its bending stiffness. In view of this, the paper gives up some traditional assumptions and assumes that the line normal to middle plane remains a line but not normal to the middle plane so as to include the influence of transverse shear deflection. The paper gives a rapid technique to calculate the overall compression bulkling of double wall grillage: dividing complex double wall grillage (including the common plate and the stiffed plate) from its nearby structures, calculating their influence by elastically constrained edges, employing the theories of orthotropic plate to describe its mechanical characters and solving the critical stress by energy methods. It is more convenient in the stage of testifying the plans of engineering.