To enhance the bearing capacity of conventional concrete-filled steel tubular columns and meet the requirements of roadside support structures in underground roadways with heights ranging from 2.5 to 3.0 meters,an internally reinforced steel concrete-filled steel tubular pier column was proposed.Specific design parameters for concrete-filled steel tubular columns with appropriate length-to-diameter ratios were developed to suit the conditions of underground roadways.Comparative experiments were conducted to evaluate the mechanical properties of conventional and internally reinforced concrete-filled steel tubular short columns,and the axial compression performance of concrete-filled steel tubular long columns was also studied.The results indicate that the internally reinforced concrete-filled steel tubular pier columns exhibit reduced local buckling and core concrete damage compared to conventional concrete-filled steel tubular pier columns.These columns demonstrate smaller lateral and longitudinal deformations,slower failure progression,and superior ductility.Additionally,the ultimate bearing capacity of the internally reinforced concrete-filled steel tubular pier column is 500 kN higher than that of its conventional counterpart.For concrete-filled steel tubular long columns,the elastic limit strain ranges from 0.1%to 0.6%,while the plastic limit strain ranges from 2.0%to 6.7%.However,the bearing capacity of concrete-filled steel tubular long columns decreases significantly with an increasing length-to-diameter ratio,and their failure mode is characterized by pronounced buckling deformation.These findings provide valuable insights for optimizing the structural design and improving the mechanical performance of concrete-filled steel tubular pier columns.
road supportingconcrete-filled steel tube pierinternally reinforced steelstructural optimizationmechanical properties of long and short columns
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