FE Analysis of Hexagonal High Strength Concrete-Filled Double-Skin Steel Tubular Short Columns Subjected to Axial Compressive Forces

Document Type : Original Article

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Kafr El Sheikh-Kafr El-Sheikh City - Al-Zuhur District - Building 38

Abstract

Concrete-filled tubular double skin (CFDST) columns comprise a tube-in-tube configuration with concrete poured into the annular spaces between the hollow parts (such as natural compaction) or mortar. Aligning the double steel pipes creates space in the middle of the column, reducing the amount of concrete needed to construct the column. Currently, due in part to a lack of design standards, composite structures consisting of concrete-filled hexagonal double-layer tubular columns (HCFDST) with internal circular tubes have not been widely applied worldwide. The compression performance of these columns is investigated in this paper. Finite element analysis was used to determine the HCFDST columns structural characteristics. Using experimental data available for HCFDST, the suggested FEM model was validated to demonstrate the model correctness and dependability. A validated FE model was utilized to investigate the impact of various factors on the load-displacement response of short HCFDST columns through parametric studies conducted on the columns. This work proposes a novel formula to determine the ultimate load capacity of short HCFDST columns under axial compression.

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