Experiment on the Bearing Capacity of the Joint for Steel Tower-Composite Tower Hybrid Structure
Aimed at the new joint structure of the steel tower-composite tower hybrid structure,an axial compression test of locally scaled model was carried out,and a nonlinear finite element model was built for comparing with the test results.The ultimate bearing capacity and failure mode of the steel tower-composite tower joint were studied.The strain distribution law of the steel plates and the force distribution law of the studs were evaluated,and a parameter analysis was conducted on the force transfer path and load sharing ratio.Results show that the bearing capacity of the joint meets the design requirements.The failure mode of the joint is the yielding and large out-of-plane deformation of steel plate.The bearing plate is the core force transfer component of the joint section,and increasing the plate thickness can improve the ultimate bearing capacity of the joint and the load transferred by the bearing plate.The plate thickness should be similar to the thickness of the outer wall plate.Studs and perfobond connectors are the key components to ensure the combination of steel and concrete in the joint.The connectors mainly bear vertical shear forces before the steel wall plate yields,and mainly bear tensile forces after the steel wall plate yields.
hybrid bridge towerjointmodel testforce transfer mechanismbearing capacity
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