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通过对框架式筒中筒结构的钢模型试验,建立计算模式。将侧力作用下的框筒变形分解为弯翘效应和剪切效应两个独立部分,写出总势能泛函。引入单位曲率,从而先算出轴向翘曲位移模式,使推出的连续化位移法控制微分方程大为简化。算例表明本文算法是可靠和实用的,可供初步设计应用。
By calculating the steel model of the tubular structure of the frame tube, the calculation mode is established. The deformation of the frame tube under the action of the side force is decomposed into two separate parts of the bending effect and the shearing effect, and the total potential energy function is written out. The unit curvature is introduced to calculate the axial warp displacement mode first, which simplifies the control differential equation by the continuous displacement method. The examples show that the proposed algorithm is reliable and practical and can be used for preliminary design.