Research on Stiffness Reduction Model of Bolt Joints of Angle Steel Transmission Tower
To study the node stiffness loss caused by bolt looseness of transmission tower,with a transmission tower as an example,the position of the most dangerous member of transmission tower under wind load at different wind angles is found with ANSYS platform.Then the stiffness loss of the most dangerous member is simulated under the condition of different bolt preload and different lost bolt number.It is found that for multi-bolt joints,if the number of bolts is not reduced,stiffness loss is mainly related to preload.If the number of bolts is reduced,the influence of pretightening force can be ignored.The equivalent rotational stiffness of the joint is mainly provided by the shear capacity of the bolt rod.When the number of remaining bolts in the joint is not less than 2,the equivalent rotational stiffness of the single joint should still be considered in the shear capacity of the bolt.
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