Study on Influence of Preload on Load Bearing Characteristics of Transmission Tower Joints

In order to explore the failure mechanism of transmission tower under wind load,this paper takes the actual transmission tower system as an example,establishes a fine model of transmission tower nodeS under different bolt pretightening forces,and simulates the tightening degree of bolts in the construction process of the transmission tower. A nonlinear contact force model between bolt and transmission tower components is proposed to accurately simulate the contact effect of transmission tower components under wind load. The results show that with the increase of preload,the screw holes stress of the angle steel,the stress of screw holes in the nodal plate matching those in the angle steel and the bolts stress of the angle steel increase gradually and linearly,while the screw holes stress of the main structure,the stress of screw holes in the nodal plate corresponding to those in the main structure and the bolts stress of the main structure remain basically unchanged. With the increase of the external load rat