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Research Article

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

Brijesh Singh, Pranay Singh, Parmanand Ojha, Abhishek Singh

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



Ultra-High Strength Concrete;

Stress-block Parameters;

IS456-2000; Eurocode;

Flexural design of concrete structures

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.

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01/01/2024 Best Paper Award: The winners of 2023 Best Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.

01/01/2024 Most Cited Paper Award: The winners of 2023 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.

01/01/2024 Reviewer Awards: The winners of 2023 reviewer awards of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Reviewer Awards section.

8/12/2023 Special Issue: Embark on a journey of innovation with the journal of Research on Engineering Structures and Materials as we unveil a compelling opportunity for contributors in our upcoming special issue, "Design, Analysis, and Manufacturing of Composite Vehicle Structures." Led by distinguished Guest Editors Liubov Gavva and Oleg Mitrofanov from Moscow Aviation Institute. For more info see the link.

21/10/2023 Journal Submission System Upgrade Completed: We're delighted to announce that our Journal Submission and Tracking System has undergone a significant upgrade, aimed at enhancing user experience. 

(More details of the news may be given in the News section)

For more see News...


2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.

2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.

2023 Most Cited Paper Award:

The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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