Experimental Investigation into Axially Compressive Behavior of Circular Concrete-Filled Steel Tubular Columns with Built-in High-Strength Steel Tube 
WU Bo YE Wenjie
Journal of South China University of Technology (Natural Science Edition) . 2020, (4): 1 -8 .  DOI: 10.12141/j.issn.1000-565X.190502