风电机组钢板-混凝土组合塔筒中钢板弹性屈曲临界应力计算方法

Calculation Method of Critical Stress of Elastic Buckling of Steel Plate in Steel-concrete Composite Tower of Wind Turbine

主要探究了钢板-混凝土组合塔筒中计算长度系数的影响因素以及钢板弹性屈曲临界应力的计算方法。文章首先基于欧拉公式构建了平钢板的弹性屈曲临界应力模型,并结合弹性屈曲临界应力公式确定了计算长度系数是决定钢板弹性屈曲临界应力的重要参数。随后选取曲率半径、钢板厚度、栓钉竖向间距三个因素,采用控制变量法探究了每个因素与计算长度系数之间的关系,以及距厚比、距径比对计算长度系数的影响,最终得到了基于距厚比和距径比的弹性屈曲临界应力计算公式。根据该公式得出结论:只要钢板的弹性屈曲临界应力不低于钢材的屈服强度,即可保证钢板-混凝土组合塔筒不会出现局部失稳破坏。

The factors influencing the calculation of the length coefficient and the calculation method of the critical stress of the elastic buckling of steel plate in steel-concrete composite tower are discussed.Based on Euler's formula,a critical stress model of elastic buckling of flat steel plate is established,and the length coefficient is determined as an important parameter to determine the critical stress of elastic buckling of steel plate.Then,three factors,namely radius of curvature,thickness of steel plate and vertical spacing of bolts,were selected,and the relationship between each factor and the calculated length coefficient was explored by using the control variable method,as well as the influence of the ratio of distance to thickness and distance to diameter on the calculated length coefficient.Finally,the formula for calculating the critical stress of elastic buckling based on the ratio of distance to thickness and distance to diameter was obtained.According to the formula,it can be concluded that as long as the critical elastic buckling stress of steel plate is not lower than the yield strength of steel,the local instability failure of steel-concrete composite column can be guaranteed.