RESULTS FOR DEFLECTION IN CONCRETE

Definition: movement of a point on a structure or structural element, usually measured as a linear displacement or as succession displacements transverse to a reference line or axis.- ACI Concrete Terminology

Deflection control is an important serviceability consideration in the structural design of concrete buildings. The principal material parameters that influence concrete deflection are modulus of elasticity, modulus of rupture, creep, and shrinkage. While provision of an adequate level of safety against collapse is the primary design consideration, the structural engineer must take into account possible adverse effects of excessive deflections on the performance of the structure at service load levels. Potential problems associated with excessive deflections are well known and include: damage to nonstructural elements such as partitions and windows; jamming of doors and windows, gaps between partitions and floors and between columns and floors; improper operation of equipment; and visual perception of sagging floors and ceilings.

Informational Resources News, Events & Engagements ACI Web Pages

Informational Resources on Deflection in Concrete

STANDARDS, PRACTICES and MANUALS ON DEFLECTION IN CONCRETE

ACI PRC-435-20: Report on Deflection of Nonprestressed Concrete Structures

ACI/PCI CODE-319-25: Structural Precast Concrete—Code Requirements and Commentary

ACI CODE-318-25: Building Code for Structural Concrete- Code Requirements and Commentary (ACI CODE-318-25)

ACI/PTI CODE-320-25: Post-Tensioned Structural Concrete—Code Requirements and Commentary

MNL-7(23) GFRP-Reinforced Concrete Design Handbook

ACI CODE-440.11-22: Building Code Requirements for Structural Concrete Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars—Code and Commentary

MNL-17(21) - ACI Reinforced Concrete Design Handbook

ACI CODE-318-19(22): Building Code Requirements for Structural Concrete and Commentary (Reapproved 2022)

SP-004: (8TH) Formwork for Concrete

ACI CODE-318-14: Building Code Requirements for Structural Concrete and Commentary

View all Documents on Deflection in Concrete »

JOURNAL Articles ON DEFLECTION IN CONCRETE

Shear Strengthening of RC Beams Using Partial‑Length Near‑Surface Mounted (PLNSM) CFRP Strips

Publication: IJCSM
Date: 3/31/2025

Enhancing Mechanical Properties of Alkali‑Activated Slag SIFCON for Sustainable Construction Using Recycled Glass and Tire‑Derived Waste Steel Fibers

Publication: IJCSM
Date: 3/31/2025

Proposed ACI 318 Equations for Immediate Deflection of Prestressed Concrete Members (Prepublished)

Publication: Structural Journal
Date: 3/25/2025

Developed Approach for Shear Modeling of ETS-FRP-Strengthened RC Beams (Prepublished)

Publication: Structural Journal
Date: 3/17/2025

Effectiveness of Various Types of Macro-Modeling Methods for Reinforced Concrete Shear Walls (Prepublished)

Publication: Structural Journal
Date: 3/17/2025

Split Tensile Behavior of Recycled Steel Fiber-Reinforced Concrete

Publication: Materials Journal
Date: 3/1/2025

Structural Performance of Geopolymer Concrete: Bond, Flexural, Shear, and Axial Strengths

Publication: Structural Journal
Date: 3/1/2025

Experimental, Numerical, and Analytical Investigation of the Reinforced Concrete Hidden and Wide Beams

Publication: IJCSM
Date: 1/31/2025

Bending Behavior of RC Beams with Regular Web Openings and Non-corroding GFRP Reinforcement

Publication: IJCSM
Date: 1/31/2025

Immediate Deflection of Cracked Prestressed Concrete Beams Based on Integration of Curvature

Publication: Structural Journal
Date: 1/1/2025

Search all Articles on Deflection in Concrete »

Practice oriented papers and articles ON DEFLECTION IN CONCRETE

Computing Deflections Using ACI CODE-318-19 and Beyond, Part 4

Publication: Concrete International
Date: 5/1/2025

Computing Deflections Using ACI CODE-318-19 and Beyond, Part 3

Publication: Concrete International
Date: 4/1/2025

Computing Deflections Using ACI CODE-318-19 and Beyond, Part 2

Publication: Concrete International
Date: 3/1/2025

Computing Deflections Using ACI CODE-318-19 and Beyond, Part 1

Publication: Concrete International
Date: 2/1/2025

Serviceability of Concrete Structures for Explosives Operating Locations and Live-Fire Training Facilities

Publication: Special Publication
Date: 12/1/2024

Serviceability of Concrete Structures for Explosives Storage

Publication: Special Publication
Date: 12/1/2024

Further Thoughts on "Tilt-Up Design Pitfalls"

Publication: Concrete International
Date: 10/1/2024

Structural and Deformational Behavior of Flexural Concrete Beams Reinforced with GFRP and BFRP Rebars

Publication: Special Publication
Date: 3/1/2024

Open Issues on the Structural Performances of Concrete Beams Reinforced with FRP (Fiber Reinforced Polymers) Rebars

Publication: Special Publication
Date: 3/1/2024

Deflection Behavior of Beams Prestressed with Bonded FRP Tendons

Publication: Special Publication
Date: 3/1/2024

Search all Articles on Deflection in Concrete »

Certification Resources on DEFLECTION IN CONCRETE

There are no Certification Resources on Deflection in Concrete

View all ACI Certification Resources on Deflection in Concrete »

Education Publications on DEFLECTION IN CONCRETE

There are no Education Publications on Deflection in Concrete

View all ACI Education Publications on Deflection in Concrete »

Online Learning - ACI University on DEFLECTION IN CONCRETE

Certificate Program: Designing Concrete Structures Reinforced with GFRP Bars Using the ACI CODE-440.11-22

On-Demand Course: Guidelines for Using FRP Dowels in Concrete Pavement

On-Demand Course: ACI CODE-440.11-22: Serviceability and Flexural Design of GFRP Reinforced Concrete

On-Demand Course: Constructability Series: Structural System Concept Design (2-part series)

On-Demand Course: Reshoring and Early-Age Building Behavior

On-Demand Course: Un-Shored Composite Slabs on Metal Deck—Challenges to Achieving Level Floor Elevations

On-Demand Course: Troubleshooting Concrete Forming and Shoring

On-Demand Course: Design Detailing to Mitigate and Control Cracking

On-Demand Course: Shoring and Reshoring for Multistory Concrete Buildings

View all ACI Online Learning Courses on Deflection in Concrete »

FREE ONLINE EDUCATION PRESENTATIONS ON DEFLECTION IN CONCRETE (VIDEOS)

Advanced Numerical Modeling Methodology for Strength Evaluation of Deep Bridge Bent Caps

by Serhan Guner, and Anish Sharma

Application of Strip Model to Edge Column-Slab Connections with Outward Eccentricity

by Scott Alexander and Eva Lantsoght

Comparative Analysis of Different Technologies to Measure the Vertical Deflection in High-Span High-Rise Concrete Box-Girder Viaducts

by Miguel Angel Vicente

Comparisons of Concrete Slender Wall Software with Full-Scale Experiments

by Gloriana Moua

Corrosion of Reinforcement in High-Performance Concrete

by Michael M. Sprinkel

Development of Database for Structural Load Tests

by Mohamed ElBatanouny

Effect of Shear Span-to-Depth Ratio on the Behavior of RAC Beams

by Khalil

Effects of Early-Age Material Properties on Concrete Slab Deflection

by Caitlin Mancuso

Elevated Concrete Floor Slabs: How to Be on the Level

by Douglas Sarkkinen

Energy Harvesting Cementitious Materials through Nanofiber Incorporations

View all free presentations on Deflection in Concrete »

FREQUENTLY ASKED QUESTIONS ON DEFLECTION IN CONCRETE

Question: Tolerances for floors supporting operable partitions

View all Frequently Asked Questions on Deflection in Concrete»

News, Events & Engagements on Deflection in Concrete

EVENTS ON DEFLECTION IN CONCRETE

October 26, 2025

Long-Term Slab Deflection: Practical Insights for Design Engineers

View all Deflection in Concrete Events »

NEWS ON DEFLECTION IN CONCRETE

January 17, 2024

ACI-RILEM Joint Webinar for Young Members To Highlight Cementitious Materials for Advanced Construction

March 3, 2021

ACI’s New Honorary Members

October 30, 2019

American Concrete Institute Announces Winners of FRP Composites Student Competition

May 10, 2018

Eastern Pennsylvania & Delaware Chapter (EPDACI) 2018 Student Beam Contest

March 31, 2017

American Concrete Institute Announces Winners of Student Fiber-Reinforced Polymer Composites Competition

February 27, 2017

ACI’s New Honorary Members

August 17, 2015

Constructability in the Mile-High City

April 23, 2015

Week of Learning and Fun at The Concrete Convention and Exposition

April 14, 2015

American Concrete Institute Announces Winners of Student Fiber-Reinforced Polymer Composites Competition

October 20, 2014

ACI Reinforced Concrete Design Handbook -- Coming in Summer 2015

View All ACI News »

COMMITTEES ON DEFLECTION IN CONCRETE

Deflection of Concrete Building Structures

Search all Committees »

CERTIFICATIONS ON DEFLECTION IN CONCRETE

There are no Certifications on Deflection in Concrete

View all certification programs »

ACI Web Pages on Deflection in Concrete

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