Accounting for the Scale Factor in Determining the Compressed Concrete Strength of Concrete-Filled Steel Tube Elements

Elvira P Chernyshova,Vladislav E Chernyshov,C Chastre,P Mendonça

doi:10.1051/matecconf/201927803003

Abstract

The published experimental data on the influence of the concrete samples dimensions on their strength under axial compression had been analyzed in the article. The mechanism of this influence is revealed from the positions of strength statistical theories. The known dependences are given and a new formula is proposed for taking into account the scale factor in determining the strength of compressed concrete. An algorithm for calculating the strength of centrally compressed concrete-filled steel tube elements (CFSTE) with a circular cross-section taking into account the scale factor is shown.

Highlights

According to the current regulations of the Russian Federation, the effect accounting of the working section dimensions of concrete and reinforced concrete structures on the concrete strength in axial compression is not provided in their calculation
It is necessary to take into account the effect of the scale factor for section sizes that differ from the reference
The design resistance to uniaxial compression of the concrete core of the concrete-filled steel tube element fbc taking into account the scale factor is recommended to be determined as follows fbc с fc, (4)

Summary

Introduction

According to the current regulations of the Russian Federation, the effect accounting of the working section dimensions of concrete and reinforced concrete structures on the concrete strength in axial compression is not provided in their calculation. Similar data of Japanese researchers are noted here [2] These experiments have established that the compressive strength of concrete decreases with increasing of sample sizes. Heavily loaded reinforced concrete columns are increasingly used [3,4,5,6]. It is necessary to investigate more thoroughly the influence of structural dimensions on the concrete strength in such a situation. Concrete control samples with cross-sectional dimensions of 150×150 mm are accepted as reference in the existing standards of the Russian. It is necessary to take into account the effect of the scale factor for section sizes that differ from the reference

Main part

Summary