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"Numerical modeling of self-compacting concrete columns longitudinally " by Mizan Ahmed, M. Neaz Sheikh et al.

This paper presents an investigation on the efficiency of steel tubes in reinforcing self-compacting concrete (SCC) columns. A theoretical model is developed to study the axial behavior of SCC columns reinforced with steel tubes, considering the effects of confinement on the filled concrete by steel tubes and concrete core confined by spirals. The computational results are validated against the existing test results of SCC columns. The effects of various column parameters on the performance of SCC short columns under axial concentric loading are investigated. It is shown that the axial performance of SCC columns is influenced by the dimension and number of steel tubes, pitch of spirals, compressive strength of concrete, and yield stress of the steel tubes. ....

Composite Columns , Fiber Analysis , Self Compacting Concrete , Hort Columns , Steel Tube ,

"Fiber element modeling of circular double-skin concrete-filled stainle" by Mizan Ahmed, Qing Quan Liang et al.

Circular concrete-filled double-skin steel tubular (CFDST) columns with external stainless-steel are high-performance composite columns that have potential applications in civil construction including the construction of offshore structures, bridge piers, and transmission towers. Reflecting the limited research performed on investigating their mechanical performance, this study develops a computationally efficient fiber model to simulate the responses of short and slender beam-columns accounting for the influences of material and geometric nonlinearities. Accurate material laws of stainless steel, carbon steel, and confined concrete are implemented in the mathematical modeling scheme developed. A new solution algorithm based on the Regula-Falsi method is developed to maintain the equilibrium condition. The independent test results of short and slender CFDST beam-column are utilized to validate the accuracy of the theoretical solutions. The influences of various column parameters are st ....

Circular Concrete Filled Double Skin Steel Tubular Columns , Composite Columns , Computational Analysis , Design Models , Hort And Slender Columns ,

"Axial compressive behavior of circular concrete-filled double steel tu" by Junchang Ci, Mizan Ahmed et al.

This article investigates the axial compressive performance of concrete-filled double steel tubular (CFDST) short columns composed of circular section loaded concentrically. An experimental program comprised of compression tests on short columns is carried out to examine their structural performance. Axial compression tests on conventional concrete-filled steel tubular (CFST) columns and double-skin concrete-filled steel tubular (DCFST) columns are also performed for comparison purposes. The test parameters include the diameter-to-thickness of the outer and inner steel tubes, concrete strength, and diameter ratio. The test results exhibit that CFDST short columns composed of the circular section have improved structural performance compared to its CFST and DCFST counterparts. A theoretical model is also presented to simulate the test ultimate strengths and load-axial strain relationships of CFDST columns. The existing design models proposed including the codified design specifications ....

Artificial Neural Network , Cfdst Columns , Composite Columns , Ompressive Strengths , Hort Columns ,

"Fiber-based computational modeling of rectangular double-skin concrete" by Muhammad Rizwan, Qing Quan Liang et al.

Both the external and internal thin-walled steel sections of a rectangular double-skin concrete-filled steel tubular (RDCFST) short column loaded axially may be susceptible to progressive local buckling, which is rarely included in mathematical modeling programs employing the fiber discretization scheme for such composite members. This paper provides a description of a new computational simulation technology, which is developed for the nonlinear fiber analysis of short RDCFST columns axially loaded to failure. The progressive localized-buckling failure of thin-walled steel sections are included in the formulation of the computational simulation method. Experimental measurements and finite element analysis results obtained by ABAQUS software by other researchers are employed to evaluate the accuracy of the computer algorithms developed. Numerical studies are undertaken to ascertain the responses of RDCFST columns to the change of design parameters. Proposed is a mathematical expression ....

Composite Columns , Computational Modelling , Onlinear Simulation , Ost Buckling ,