The IUP Journal of Structural Engineering
Experimental Investigation of Concrete Filled Steel Tube (CFST) Columns

Article Details
Pub. Date : April, 2021
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE30421
Author Name : Malatesh Ganiger, Pavan V Gudi and Sachin R Kulkarni
Availability : YES
Subject/Domain : Science and Technology
Download Format : PDF Format
No. of Pages : 12

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Abstract

Concrete Filled Steel Tube (CFST) is a composite material which is currently used in high-rise buildings due to excellent seismic-resistant structural properties. CFST columns combine the best characteristics of both steel and concrete material, since they have high strength, ductility and high stiffness. The paper investigates the effect of slenderness ratio on behavior of CFST columns under axial compression for mix design of M40 grade concrete with w/c 0.45 as per IS: 10262 (2019) for 28 days curing period. Nine specimens with heights ranging from 350 mm to 750 mm with intervals of 50 mm were tested under axial compression. The slenderness ratio (L/D) is varied from 3 to 7. The effect of slenderness ratio on ultimate load carrying capacity is studied. It is observed that an increase in slenderness ratio gradually decreased the ultimate load carrying capacity of CFST. The large slenderness ratio specimens resulted in failure by buckling. The shorter columns are failed by crushing of the concrete. The effect of failure mechanism is also studied. It is noticed that as load approached the ultimate load the strains gradually increased. A relation between load and deflection is plotted. The effect of varying slenderness ratios on axially loaded CFST columns depends upon the geometric and material properties under short-term and long-term loadings.


Description

Concrete Filled Steel Tube (CFST) is a kind of composite material which is more widely used in building construction at present. The application of CFST columns in high-rise buildings has become more and more popular in recent years. It is very important to have a reasonable understanding of the behavior of these column beams under seismic load. In today's era, building infrastructure for the development of a country is the most important task for civil engineers. CFST is an innovative material which can withstand high loads with greater stiffness and is conducive to accelerating the construction and maintenance of the economy. CFST structure is


Keywords

Axial compression, CFST, Slenderness ratio

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