Numerical modelling for predicting the postpeak behaviour of circular CFST stub columns under axial loading
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Date
2018-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In today’s world where the land cost is very high any saving in terms of floor area will be considered advantageous in terms of construction cost as well as in terms of more space. Generally, columns in multi-storeyed buildings, occupy large area of the floor resulting in more cost and less carpet area. Keeping this in mind, new innovative composite columns were designed which can carry more load and occupy less floor area. Concrete Filled Steel Tubular columns represent such a class of structural components, which can utilize the most favourable properties of both, steel and concrete. The compressive strength per unit cost of this structure is higher than that of traditional columns reinforced with steel. In this study, equations are proposed to compute the load carrying capacity of CFST circular stub column and to predict the post-peak behavior. The graphs generated from the proposed equations were validated using the experimental data taken from the papers of previous researchers. A parametric study was also performed to study the influence of the four factors on the behaviour of CFST circular stub column, namely (i) Diameter to thickness ratio, (ii) Grade of steel, (iii) Grade of concrete and (iv) steel contribution ratio (δs).EUROCODE 4 is the most recently completed international standard in composite construction. In this study, a comparison was also presented between the experimental peak values of the specimens taken under this study, design load as per EC 4 recommendations and predicted load carrying capacity by modelled equations.
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