The cup-type tower is widely used in transmission lines.The slope transition joint,as one of the most critical component,is commonly constructed by connecting inner steel angles or welding outer steel plates to enhance the strength.Comparing to conventional joints,the thickness of the inner steel angle and outer steel plate is increased.However,research on the load-bearing performance of these slope transition joints remains limited within the industry,and existing regulations do not explicitly define their design methods.In this paper,the compression performance of slope transition joints in the ZNC33153B testing tower is analyzed using finite el-ement software.The results show that the eccentric load on the lower main structure near the bottle neck is sig-nificant.Due to the joint's substantial stiffness,the current commonly used construction method provides a safe and reliable solution.However,if the inner angles or outer welded plates are removed or not interconnected,the stiffness of the joint will be reduced,resulting in a reduction in the compressive load capacity for the lower main structure.Additionally,since the slope transition joints primarily transmit force from the front,the current design method may lead to insufficient bolt quantities and pose safety risks.Based on the analysis,a bolt shear design method that accounts for eccentric loading to enhance the safety and reliability of slope transition joints in cup-type transmission towers is proposed.
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