Abstract

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Title:: Experiment on Mechanical Behavior for Concrete-filled Circular Steel Tube K-type Welded Tube-gusset Joints

Author(s):: GAO Chun-yan; YANG Wei-ping; LI Bin; SHI Zhi-yu; School of Architecture and Civil Engineering, Inner Mongolia University of Science and Technology

Keywords:: ]concrete-filled circular steel tube; welded tube-gusset joint; static loading experiment; failure mode; ultimate bearing capacity; mechanical behavior

Abstract:: In order to study the mechanical behavior of Ktype welded tubegusset joints in latticed concretefilled steel tube (CFST) wind turbine tower, four CFST Ktype welded tubegusset joints and a comparative hollow steel tube Ktype welded tubegusset joint were experimented under monotonic loading. The failure mode, ultimate bearing capacity and stress distribution laws of joint zone were discussed. Meanwhile, the influence of experiment parameters on the mechanical behavior of joints were studied. The experiment results show that filling concrete in tower column makes the failure mode of welded tubegusset joints change from the plastic deformation failure of tower column at joint intersection area to the failure of gusset plate and web member, the bearing capacity of joint increase significantly and the deformation reduce. The geometric parameters and structural parameters of joints have great influence on the mechanical behavior of specimens. When the stiffening rib is set at the center of gusset plate, the bearing capacity of joint increases, the outofplane instability of gusset plate is effectively avoided. When the ultimate bearing capacity of joints is decided by the buckle or yield bearing capacity of web member, the bearing capacities increase with the increase of the diameter ratio and wall thickness ratio between web and tower column.