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Steel and Composite Structures
  Volume 39, Number 5, June 102021 , pages 583-598
DOI: https://doi.org/10.12989/scs.2021.39.5.583
 


Axial behavior of the steel reinforced lightweight aggregate concrete (SRLAC) short columns
Mostafa M. A. Mostafa, Tao Wu, Xi Liu and Bo Fu

 
Abstract
    The composite steel reinforced concrete (SRC) columns have been widely used in Structural Engineering due to their good performances. Many studies have been done on the SRC columns' performances, but they focused on the ordinary types with conventional configurations and materials. In this study, nine new types of steel reinforced lightweight aggregate concrete (SRLAC) short columns with cross-shaped (+shaped and X-shaped) steel section were tested under monotonically axial compressive load; the studied parameters included steel section ratio, steel section configuration, ties spacing, lightweight aggregate concrete (LWAC) strength, and longitudinal bars ratio. From the results, it could be found that the specimens with larger ties ratio, concrete strength, longitudinal bars ratio, and steel section ratio achieved great strength and stiffness due to the excellent interaction between the concrete and steel. The well-confined concrete core could strengthen the steel section. The ductility and toughness of the specimens were influenced by the LWAC strength, steel section ratio, and longitudinal bars ratio; in addition, larger ties ratio with smaller LWAC strength led to better ductility and toughness. The load transfer between concrete and steel section largely depends on the LWAC strength, and the ultimate strength of the new types of SRLAC short columns could be approximately predicted, referring to the codes' formulas of ordinary types of steel reinforced concrete (SRC) columns. Among the used codes, the BS-5400-05 led to the most conservative results.
 
Key Words
    lightweight aggregate concrete (LWAC); steel reinforced concrete (SRC) short column; axial behavior; high strength concrete; concrete encased composite (CEC) column; failure mode
 
Address
Mostafa M. A. Mostafa: Structural Engineering Department, School of Civil Engineering, Chang'an University, Xi'an, China
Civil Engineering Department, Faculty of Engineering, Al–Azhar University, Qena, Egypt
Tao Wu, Xi Liu and Bo Fu: Structural Engineering Department, School of Civil Engineering, Chang'an University, Xi'an, China
 

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