作　　者： ; ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《工业建筑》 2010年第S1期375-379,共5页

摘　　要： 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。 In this paper,the spatial bending stiffness issue of the self-supporting tower is transformed from three-dimensional analysis to two-dimensional analysis based on the truss piecewise method.In this paper,the flexibility coefficient of the truss piecewise is calculated.The space bending stiffness and the angle displacement are transformed to the expressions of each plane space truss.Thus the bending stiffness mathematical models are established.The present model is compared with the finite element model.Effects of the bars' cross-section parameters and their spatial arrangement parameters on the bending stiffness are analyzed.Finally,the overall stiffness of the tower is calculated.The bending modals are extracted by using the Rayleigh-Ritz method.The following analysis of towers can be considered as a fundament for the further study on the tower based on these mathematical models and relative conclusions.

关 键 词： 分片桁架法 瑞利 里兹法 抗弯刚度 弯曲模态

领　　域： [建筑科学]