Experimental and numerical investigations of the compressive behavior of concretefilled steel tubular columns / Pouria Ayough

Pouria , Ayough (2022) Experimental and numerical investigations of the compressive behavior of concretefilled steel tubular columns / Pouria Ayough. PhD thesis, Universiti Malaya.

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Abstract

Due to the advantages associated with the confinement effect provided by tubes in terms of improving the mechanical performance of concrete cast from waste material such as rubberized concrete (RuC), CFST and CFDST columns are excellent options for developing environmentally sustainable and economically viable structural members that aid in waste material recycling. The fundamental drawback of composite columns is tube buckling. The tube's buckling impairs the confinement effect and column ductility. Various forms of steel stiffeners have been used to increase the buckling resistance of tubes. Additionally, RuC's mechanical properties are predicted to increase the ductility of composite columns. However, little research has been undertaken on the influence of shear studs or RuC on the mechanical performance of composite columns. Various shapes of composite columns may be found worldwide, depending on aesthetics, specific architectural design styles, structural circumstances, and economic objectives. However, research comparing their structural performance with various forms is rare. This study investigates experimentally and numerically the performance of CFST and CFDST columns under axial compression. Experiments were conducted on eight axially loaded circular CFDST columns with and without bolted shear studs to determine the efficacy of bolted shear studs in enhancing their performance. Advanced FE models of CFDST columns with and without bolted shear studs were developed and validated by comparison with experimental results recorded in this research. Novel design models were recommended to predict the compressive capacities of circular CFDSTs with and without bolted shear studs. To examine the influence of cross-sectional forms on the structural performance of columns, FE models of CFSTs with circular and polygonal sections were generated. Following that, FE models of CFDST columns with normal concrete (NC) and RuC were generated. The validation of the FE simulation of CFSTs and CFDSTs with NC and RuC was made by comparing their predictions with the available experimental data. This research contributes to the knowledge by adding new experimental and FE test results on CFST and CFDST columns to the database. The numerical models developed provide researchers and structural designers with a deep understanding and accurate results, which lead to safer and more economical designs of composite structures. The experimental and numerical test results indicated the efficiency of bolted shear studs in improving the ductile performance of circular CFDSTs. The bolt spacing equivalent to

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