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

STANDARDS, PRACTICES and MANUALS ON DEFLECTION IN CONCRETE

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

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

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

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

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

ACI CODE-350-20: Code Requirements for Environmental Engineering Concrete Structures (ACI 350-20) and Commentary (ACI 350R-20)

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

View all Documents on deflection in concrete »

JOURNAL Articles ON DEFLECTION IN CONCRETE

Study on the Fracture Characteristics of Reinforced Concrete Small Beam Specimens Under Static and Dynamic Loads (Prepublished)

Publication: Structural Journal
Date: 8/14/2026

Flexure and Shear Behavior of Recycled and Natural Aggregate Concrete Slabs Reinforced with GFRP Bars (Prepublished)

Publication: Structural Journal
Date: 8/7/2026

Lap-Splice Tests of 600 MPa Reinforcing Bars for Slag-Based Concrete

Publication: Structural Journal
Date: 7/1/2026

Long-Term Behavior of Cracked Carbon Fiber-Reinforced Polymer Prestressed Concrete Beams in 1200-Day Sustained Load

Publication: Structural Journal
Date: 7/1/2026

Flexural Behavior of Innovative Precast Concrete Bleacher-Seat Units Reinforced with GFRP Bars (Prepublished)

Publication: Structural Journal
Date: 6/17/2026

Novel Small-Scale Accelerated Load Test for Assessing Dowel Performance