Hybrid reinforced concrete
Fibers and rebar acting together. Tensile load sharing between the fiber matrix and the bars, efficiency at low reinforcement ratios, flexural fatigue, and serviceability based design.
Structural engineer / PhD candidate / Arizona State University
Devansh Patel
Research engineer and PhD candidate at Arizona State University. I work on the design, testing and characterization of concrete composites, and I build the software that turns flexural test data into material models and design checks.
Latest release
HRC Designer 4.3, 2026-09-03
Latest journal paper
Limit-state based design of hybrid reinforced UHPC flexural beams, Engineering Structures, 2026
Latest conference paper
An interactive inverse-analysis and design tool for reinforced UHPC beams, 4th International Interactive Symposium on UHPC, 2026
Research
Concrete composites, from the bending test to the design equation.
Inverse analysis
Back-calculating the tensile stress strain law of FRC and UHPC from ASTM C1609 and EN 14651 beam tests, so the material model comes from the test rather than a handbook.
UHPC design
Parametric, closed form limit state design of reinforced UHPC beams, connection elements for precast bridge decks, and field implementation on rural bridge decks.
Precast tunnel segments
Mechanical response of segments with steel and synthetic macro fibers, validation testing, and statistical process control of residual strength QC data.
Textile reinforced concrete
Laminate theory and damage modeling as a design framework, with software for mechanical characterization and flexural design.
3D printed concrete
Modeling layered, multi material printed flexural members toward efficient structural design and optimization.
Software
Tools I write so that the models in the papers get used.
HRC Designer v4.3
Free desktop software for the analysis and design of fiber reinforced concrete, hybrid reinforced concrete, UHPC and textile reinforced concrete sections, with built-in inverse analysis of flexural test data. Developed at Arizona State University.
- Version
- 4.3, released 2026-09-03
- Modules
- ASTM C1609, EN 14651, TRC, Hybrid beam analysis, FRP rebar and strengthening, Cross-sectional analysis with P-M and prestress
- Platform
- Windows. The installer fetches the MATLAB Runtime, no MATLAB license needed.
- Cost
- Free
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parametric-uhpc
PYTHON / PYPI / MITParametric, closed form inelastic simulation of UHPC and hybrid reinforced concrete flexural members with limit state analysis. Moment curvature, load deflection and internal force distributions, with optional experimental overrides from Excel. Companion to the Engineering Structures 2026 paper.
pip install parametric-uhpc -
FRP-FRC-Flexure
PYTHON / MITClosed form flexural response of FRC and UHPC sections reinforced with steel or FRP bars, with an optional externally bonded FRP skin that activates after the section is already strained. Fourteen zones, each solved once symbolically, so the response follows by substitution rather than iteration.
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Structural Engineering Toolbox
WEB / BETAASCE 7-16 Chapter 28 wind load calculator for low-rise buildings. Zone pressures for both load cases from wind speed, geometry, roof slope and exposure.
Publications
Peer reviewed journal articles and conference papers, newest first. Every title links to the publisher record.
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2026
Limit-state based design of hybrid reinforced UHPC flexural beams using parametric modeling
Engineering Structures 357, 122353
Patel DD, Pleesudjai C, Neithalath N, Mobasher B
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2026
Modeling of layered, multi-material 3D-printed concrete flexural members. Towards efficient structural design and optimization
Materials and Structures 59(3), 167
Tripathi A, Patel D, Mobasher B, Neithalath N
Journal10.1617/s11527-026-03057-w -
2026
Mechanism of tensile load sharing in hybrid reinforced concrete flexural members
Construction and Building Materials 506, 144835
Pleesudjai C, Patel D, Araujo DL, Oliveira CA, Toledo Filho RD, Mobasher B
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2026
An interactive inverse-analysis and design tool for reinforced UHPC beams
Fourth International Interactive Symposium on UHPC
Mobasher B, Patel D, Pleesudjai C
Conference10.21838/uhpc.25666 -
2026
Technology transfer and field implementation of ultra-high-performance concrete for new and retrofitting rural bridge decks
Fourth International Interactive Symposium on UHPC
Mobasher B, Patel D, Pleesudjai C, Tripathi A, Jones R, Camp J, Neithalath N
Conference10.21838/uhpc.25665 -
2026
Software for mechanical characterization and design of textile-reinforced concrete in flexure
RILEM Spring Convention 2026, RILEM Bookseries, 625 to 632
Patel D, Pleesudjai C, Mobasher B
Conference10.1007/978-3-032-23439-1_73 -
2026
Design framework for sustainable textile-reinforced concrete using laminate theory and damage modeling
RILEM Spring Convention 2026, RILEM Bookseries, 249 to 256
Pleesudjai C, Patel D, Ghiassi B, Mobasher B
Conference10.1007/978-3-032-23439-1_29 -
2025
Generalized nonlinear moment-curvature model for flexural fatigue of hybrid reinforced concrete beams
Engineering Structures 345, 121539
Silva Junior IB, Monteiro VMA, Patel DD, Gaspar CMR, Mobasher B, de Andrade Silva F
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2025
Back-calculation of mechanical properties of fiber-reinforced concrete in tunnel lining segments
Structural Concrete 26(5), 6019 to 6040
Patel D, Pleesudjai C, Bakhshi M, Nasri V, Mobasher B
Journal10.1002/suco.70052 -
2025
Efficiency of hybrid reinforced concrete beams with low reinforcement ratios
Materials and Structures 58(6), 218
Pleesudjai C, Oliveira CAS, Araujo DL, Patel D, de Andrade MAS, Toledo Filho R, Mobasher B
Journal10.1617/s11527-025-02736-4 -
2025
Characterization of constitutive response of natural fibers reinforced concrete under flexural loading
IABSE Congress Ghent 2025, The Essence of Structural Engineering for Society
Patel D, Mobasher B, Caggiano A, Jativa F, Lantsoght E
ConferenceTU Delft record -
2024
Statistical process control of fiber-reinforced concrete precast tunnel segments
ACI Materials Journal 121(2), 127 to 139
Pleesudjai C, Patel D, Williams Gaona KA, Bakhshi M, Nasri V, Mobasher B
Journal10.14359/51740373 -
2024
Design of UHPC structural connection elements for precast bridge decks
RILEM-fib International Symposium on Fibre Reinforced Concrete, RILEM Bookseries, 276 to 283
Patel D, Tripathi A, Pleesudjai C, Neithalath N, Mobasher B
Conference10.1007/978-3-031-70145-0_35 -
2023
Generalized nonlinear moment-curvature model for serviceability-based design of hybrid reinforced concrete
Journal of Structural Engineering 149(12), 04023188
Pleesudjai C, Patel DD, Mobasher B
Journal10.1061/JSENDH.STENG-12235 -
2023
Mechanical response of precast tunnel segments with steel and synthetic macro-fibers
Cement and Concrete Composites 144, 105303
Patel D, Pleesudjai C, Bui V, Pridemore P, Schaef S, Mobasher B
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2023
Serviceability-based flexural design of UHPC beams
Third International Interactive Symposium on Ultra-High Performance Concrete
Pleesudjai C, Patel D, Neithalath N, Mobasher B
Conference10.21838/uhpc.16691 -
2021
Validation testing of precast tunnel lining segments using polymeric fibers
RILEM-fib International Symposium on Fibre Reinforced Concrete, RILEM Bookseries, 820 to 830
Patel D, Pleesudjai C, Yao Y, Schaef S, Mobasher B
Conference10.1007/978-3-030-83719-8_70 -
2020
Applications of statistical process control in the evaluation of QC test data for residual strength of FRC samples of tunnel lining segments
RILEM-fib International Symposium on Fibre Reinforced Concrete, RILEM Bookseries, 815 to 826
Pleesudjai C, Patel D, Bakhshi M, Nasri V, Mobasher B
Conference10.1007/978-3-030-58482-5_72
Media
News coverage, a conference talk, a software demo, and test footage from the lab. A thumbnail loads the player on click.
In the news
Talks and demos
From the lab, Mobasher Research Group at ASU
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UHPC Bending with DIC showing Strain Field
Sep 2026
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Hybrid Panel Testing for SRP
Aug 2020
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TBM Thrust Load Test on PCTL 2
Jan 2020
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TBM Thrust Load Test on PCTL 1
Jan 2020
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3PB - FRC Tunnel Lining Test
Nov 2019
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Fatigue Testing on FRC Rail section
Nov 2019
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ASTM C1550 Round Panel Testing at ASU
Sep 2019
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Tunnel Lining C1609 Test (DIC in 2D)
Sep 2019
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Valley Metro Testing Footage
Jul 2019
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Tunnel Segment Testing (Steel Fibers vs. Polypropylene Fibers)
Jul 2019
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Tunnel Lining Flexure Test
Jul 2019
Recognition
Two hackathon wins in 2026, the awards won by the light rail extension I worked on, and a Fulton Fellowship.
Hackathons, 2026
Innovation Hacks 2.0, ASU / Amazon sustainability track / April 2026 / 1st place
CarbonLens
Built in 15 hours with Chidchanok Pleesudjai after Amazon opened a sustainability track on the first evening of the event. An alternative rail route drawn over the existing Valley Metro network comes back with the full carbon picture, materials, construction delay, detour emissions, cost, buildability and community benefit. The inputs are live, ADOT traffic records, Census population, LEHD jobs and the TIGERweb road network. The comparison we cared about most is a conventional reinforced concrete track slab against a fiber reinforced one, which saves carbon twice, through the thinner slab and through faster construction that keeps fewer cars idling in detours.
ASU Claude Hackathon / Economic empowerment and education track / March 2026 / 1st place
SITESense
Won two weeks earlier with the same teammate at the ASU Claude Hackathon. A feasibility study before buying a lot costs $10,000 to $50,000 and takes weeks, so many buyers and small developers skip it and meet the expansive clay, the slope or the flood zone after they have signed. SITESense starts from a rectangle drawn on a satellite map and pulls elevation, flood zones, soil, seismic hazard and wetlands from 15 free federal sources such as USGS, FEMA and USDA. Deterministic ACI checks run first, then the AI layer looks for compound risks across those signals, and the result is a report on what to investigate next and which experts to call. It does not pick the foundation and does not claim code compliance.
Project awards
Northwest Extension Phase II, Valley Metro Rail, Phoenix
Valley Metro extended light rail 1.6 miles west from 19th Avenue and Dunlap, then north across I-17 to the former Metrocenter Mall. The line carries the first elevated station on the system and a rail-only bridge over the freeway, and it opened on January 27, 2024, two years ahead of the original date. My part was the fiber reinforced concrete track slab, developed at ASU with Chidchanok Pleesudjai and Professor Barzin Mobasher to carry the same load as the conventional section at lower total carbon. I was the lead researcher on the testing.
- 2025Governor’s Award for Arizona’s Future, Arizona Forward Environmental Excellence
- 2025Innovative Transportation Solutions, WTS Metro Phoenix
- 2024Engineering Excellence Honor Award, ACEC of Arizona
- 2024Build Arizona Award, AZAGC
- 2024Excellence in Safety Award, ENR Southwest
- 2024Airport/Transit Project of the Year, ENR Southwest
- 2024Project of the Year, ENR Southwest
- 2024Airport/Transit Project of the Year, out of 200 projects, ENR National
- 2024Large Project of the Year, National Railroad Construction & Maintenance Association
- 2024Top 20 finalist, out of 800 projects, ENR National Best of the Best
Fellowship
Ira A. Fulton Schools of Engineering, ASU / Fall 2023
Fulton Fellow
The fellowship carries four years of doctoral support plus summers, and the Fulton Schools offer it to their top PhD prospects on nomination by the faculty of the program and selection from the nominees across all the schools. Mine began in Fall 2023 in the School of Sustainable Engineering and the Built Environment.
Contact
Questions about the software, the models behind it, or a test program you want characterized. Email is the fastest route.
dpatel52@asu.edu- Scholarscholar.google.com/citations?user=UoncH7kAAAAJ
- LinkedInlinkedin.com/in/devanshpatl
- GitHubgithub.com/dpatel52
- Softwarehrcdesigner.com