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Confinement Effect and Efficiency of Concentrically Loaded RACFCST Stub Columns
En Wang1, Yicen Liu1, Fei Lyu1
1School of Civil Engineering, Central South University, Changsha 410075, China.
Materials (Basel, Switzerland)
|January 11, 2022
Summary
This study examines recycled aggregate concrete-filled steel tubular columns under axial load. Results show higher recycled aggregate ratios weaken structural capacity due to reduced confinement, necessitating new design formulas.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Recycled aggregate concrete-filled steel tubular (RACFST) columns offer environmental benefits and improved mechanical properties.
- Investigating the behavior of these columns is crucial for sustainable construction.
Purpose of the Study:
- To investigate the axial load behavior of recycled aggregate concrete-filled circular steel tubular (RACFCST) stub columns.
- To develop a practical design formula for the ultimate bearing capacity of RACFCST stub columns.
Main Methods:
- Development of 3D finite element (FE) models using a triaxial plastic-damage constitutive model for recycled aggregate concrete (RAC).
- Analysis considered varying replacement ratios of recycled aggregates.
- Proposed design formula derived from ultimate state stress distribution, equilibrium, and superposition theory.
Main Results:
- Decreased ultimate bearing capacity in RACFCST stub columns compared to conventional concrete-filled steel tubular (CFST) columns.
- Capacity reduction is linked to weakened confinement effects, intensifying with higher recycled aggregate replacement ratios.
- The proposed design formula was validated against existing codes and formulas.
Conclusions:
- The replacement ratio of recycled aggregates significantly impacts the confinement efficiency and bearing capacity of RACFCST stub columns.
- A new, practical design formula for ultimate bearing capacity has been proposed and evaluated.
- Findings contribute to the optimized use of recycled materials in structural engineering.
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