Study on mechanical behavior of a new type of hollow composite pylon

To investigate the mechanical behavior of a new type of composite pylon combining the hollow concrete pylon and steel plates subjected to axial load, a model test and finite element analysis were carried out. Research results show that the new type of composite pylon has advantages of two types of materials, providing an enhanced capacity and improved ductility. Load carried by steel plates is partially transferred to hollow concrete in upper pylon mainly. Perforated stiffening ribs not only transfer the load through shear action but also restrict the local exfoliation between wall plates and hollow concrete before the failure of local buckling. Reduction of two rows of connectors’ stiffness in pylon top can make the distribution of vertical shear forces of connectors on the whole. The bearing plate embedded in the bearing base can relieve the stress concentration in local areas.