论文部分内容阅读
采用分片桁架法将自立式铁塔塔架的弯曲刚度求解问题转化成二维平面问题,将塔架空间转角位移转化为各分片桁架上的平面位移,确定分片桁架的柔度系数,建立塔架空间弯曲刚度理论模型,并将模型与有限元模型计算值进行对比。通过数值计算,分析了杆件截面和空间分布等参数对塔架弯曲刚度的影响。同时计算了塔架整体刚度,并采用瑞利-里兹法计算了塔架弯曲模态。所建立的模型以及得出的结论可以为塔架弯曲分析提供理论基础。
The problem of bending stiffness of free-standing tower is transformed into two-dimensional plane problem by the piecewise truss method. The displacement of tower space is converted into the plane displacement of each segment truss, and the compliance coefficient of the segment truss is established. The theoretical model of the bending rigidity of the tower space is compared with the calculated value of the finite element model. Through the numerical calculation, the influence of the cross section and the spatial distribution of the bar on the bending stiffness of the tower is analyzed. At the same time, the overall stiffness of the tower was calculated and the tower bending mode was calculated by Rayleigh-Leitz method. The established model and the conclusion obtained can provide a theoretical basis for tower bending analysis.