Abstract
This paper is intended to investigate the stress block for high strength concrete (HSC) using the finite element model (FEM) and analytical approach. New stress block parameters were proposed for HSC including the stress intensity factor (α1) and the depth factor (β1) based on basic equilibrium equations. A (3D) finite element modeling was developed for the columns made of HSC using the comprehensive code ABAQUS. The proposed stress parameters were validated against the experimental data found in the literature and FEM. Thereafter, the proposed stress block for HSC was used to generate interaction diagrams of rectangular and circular columns subjected to compression and uniaxial bending. The effects of the stress block parameters of HSC on the interaction diagrams were demonstrated. The results showed that a good agreement is obtained between the failure loads using the finite element model and the analytical approach using the proposed parameters, as well as the achievement of a close agreement with experimental observation. It is concluded that the use of proposed parameters resulted in a more conservative estimation of the failure load of columns. The effect of the stress depth factor is considered to be minor compared with the effect of the intensity factor.
Highlights
A column is one of the most critical members of a framed structure, the failure of which could lead to a catastrophic failure of the whole structure
In order to obtain the equivalent rectangular stress block shown in Figure, for high strength concrete (HSC) to be used to evaluate the strength capacity of the structural element, MATHEMATICA software was utilized to evaluate (α1 and β1) the parameters for different values of fc′
A new equivalent rectangular stress block is proposed for HSC
Summary
A column is one of the most critical members of a framed structure, the failure of which could lead to a catastrophic failure of the whole structure. Equivalent rectangular stress blocks have been proposed for HSC by either different standard codes or researchers. Many stress-strain relationships for unconfined high strength concrete are found in the literature Those relationships were developed based on experimental work conducted by other researchers. Khadiranaikar and Awati [17] developed an equivalent stress block factor for different concrete strength through the testing of plain concrete columns, RC eccentrically loaded columns, and beams. New parameters for stress blocks were developed based on equilibrium equations to modify and extend the current code design curves of HSC columns. Those new parameters will be used to develop interaction diagrams for columns which were tested experimentally as found in the literature. A mathematical code was developed with the capability of creating design charts similar to those provided by ACI for NSC
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
