- BTech: Nepal
- MTech: IIT Gandhinagar, India, 2023
- Present: Trainee Design Engineer, Spectrum Techno Consultants
Email: sandeshtripathi@iitgn.ac.in
Area: Stress Block Parameters for Concrete: Experimental And Analytical Investigations
Stress- strain behaviour of concrete and its idealization is one of the key input factors needed for analysis and design of any Reinforced Concrete Structures (RCC). This study presents a comprehensive investigation on the stress-strain behaviour obtained through unconfined uniaxial compression test of a series of concrete cube specimens. Several grades of concrete are included in this test program with characteristic compressive strength varying from 30-90 MPa. Mix design of concrete is first carried out conforming to applicable Indian standard for 30 MPa to 90 MPa at the increment of 10 MPa. A procedure to construct the design stress-strain curve from experimental stress-strain curves targeting a specified characteristic strength is proposed along with analytical expressions up to the strain at peak stress. Stress block parameters for the design of beam and columns are developed conforming to the proposed stress-strain relation. Associated ratio of plastic moment to the moment of resistance is also computed. Effect of proposed stress-strain plot on the P-M interaction of columns is also briefly investigated. Overall, the proposed design stress-strain plot of concrete depends on its characteristic strength. This is not addressed in any of the standards nationally or internationally. Benchmarking with Indian standard, inclusion of proposed stress-strain curve does not affect the design of beam but the design of columns may appear potentially unsafe otherwise. Strong-column-weak-beam philosophy is also likely to be compromised if this effect of characteristic strength is ignored in the recommendation of design stress-strain behaviour.
Publications:
Journal Publications
- Basu, D., Mushtaq, S.M., Sharma, S., Tripathi, S. Enhancing Quality Control in the Mix Design of High-Strength Concrete Using a Capacity-Based Approach. Int J Concr Struct Mater 18, 78 (2024). https://doi.org/10.1186/s40069-024-00722-8
Conference Proceedings/Presentations
- Sharma, S., Tripathi S., and Basu, D. (2024). Empirical Relationships for Mohr-Coulomb Parameters in Concrete & Mortar: Application in Mix Design. In 18th World Conference on Earthquake Engineering (WCEE 2024).
