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一、前言塔架是空间杆件结构。由于其几何尺寸比较复杂,杆件数量较多,所以计算工作相当繁难。在现有的计算方法中,杨更新同志的“空间桁架法”是比较实用而精确的。该法在理论上比较完整,计算也比较简便。但是该法在推导计算公式时,需要解算联立方程;ξ_P和ξ_S不是塔架的形常数,而是荷载的函数,故当荷载变换时,该值即不能利用,必须重新计算。这对于用渐近法计算交叉柔性斜杆塔架是很不利的。本文提出的交点弯矩法,是将截面位置取在交叉斜杆的交点处,使由剪力所产生的
First, the foreword Tower is the space bar structure. Because of its geometry is more complicated, the number of rods more, so the calculation is quite complicated. Among the existing calculation methods, Comrade Yang’s “space truss method” is more practical and accurate. The law is relatively complete in theory, the calculation is relatively simple. However, this method needs to solve the simultaneous equations when deriving the formula. Ξ_P and ξ_S are not shape constants of the tower but functions of the load. Therefore, the value can not be used when the load is changed and must be recalculated. This is very unfavorable to the asymptotic method of calculating crossed flexible bevel towers. The intersection point bending moment method proposed in this paper takes the cross-sectional position at the intersection of crossed diagonal bars so that the shear force