Recieved:

11/10/2022

Accepted:

21/12/2022

Page: 

503

525

doi:

10.17515/resm2022.551ma1011

Views:

1654
Cited 5 times

Experimental study on stress-strain characteristics of ultra high strength concrete and its effect on stress block parameters for flexural design of building

Brijesh Singha1, Pranay Singh1, Parmanand Ojha1, Abhishek Singh1

1Centre for Construction Development and Research, National Council for Cement and Building Materials, India

Abstract

Flexural design of reinforced concrete members in structures such as buildings, bridges, etc. presented in various standards are based on the equivalent rectangular stress block and stress-block parameters for high strength concrete. However, with design of high strength concrete mixes these existing stress block parameters for normal and high strength concrete have become redundant and does not give a true representation of the obtained stress-strain curves for ultra-high strength concrete. The primary stress-strain characteristics affecting the stress block parameters are strain at peak stress, the ultimate strain and the shape of the rising limb of the curves. Past studies have confirmed a varying behaviour of all these characteristics in the stress strain curves at higher strength. The present study first evaluated the stress strain curves for high strength concrete from 90 to 140 MPa. The characteristics of the curves were compared with those of normal and high strength concrete. Based on the observed stress strain characteristics, the modified stress block parameters for the ultra-high strength concrete are presented. The proposed stress block was compared with the Indian standard IS456 and European design standard EC: 02-2004. The proposed stress block will be useful for the required modification and updating of various standards pertaining to the flexural design of ultra-high strength concrete with cylindrical compressive strength in from 90 to 140MPa.

Keywords

Ultra-High Strength Concrete; Stress-block Parameters; IS456-2000; Eurocode; Flexural design concrete structures
Cited 5 times in the last 5 years and 5 times in total in articles indexed in Scopus.

Cite this article as: 

Singh B, Singh P, Ojha P, Singh A. Experimental study on stress-strain characteristics of ultra high strength concrete and its effect on stress block parameters for flexural design of building. Res. Eng. Struct. Mater., 2023; 9(2): 503-525.
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