TCVN 5574:2018 - Concrete & Reinforced Concrete Structures

What this standard covers

TCVN 5574:2018 is the Vietnamese design standard for concrete and reinforced concrete structures. It sets out how to size and detail concrete members - beams, slabs, columns, walls and foundations - and is the concrete-design counterpart to Eurocode 2 in the Vietnamese system.

The standard covers design at both the ultimate and serviceability limit states: bending, shear, torsion and axial force with bending for the ultimate state, and crack width and deflection for serviceability. It defines the concrete grade system used in Vietnam (the B classes, based on cube strength) and the CB reinforcement grades, and gives the design strengths derived from them.

It replaced the 2012 edition and aligned much of the Vietnamese approach with the limit-state format used internationally, while keeping the B-grade concrete classification and the CB bar designations that Vietnamese practice and supply are built around. A design to TCVN 5574 therefore uses Vietnamese material grades throughout rather than the C-classes of EN 206.

What you will find in it

Concrete grades (class B)

The Vietnamese B classification, based on cube compressive strength, with the design compressive and tensile strengths and modulus of elasticity derived from each class.

Reinforcement grades (CB)

The CB bar designations used in Vietnamese supply, their characteristic and design yield strengths, and the ductility class that governs where each may be used.

Bending and axial force

Design of sections for bending, and for axial force combined with bending, covering both the large and small eccentricity regimes that arise in columns and walls.

Shear and torsion

Resistance of members with and without shear reinforcement, and the treatment of torsion where it acts alone or together with shear and bending.

Crack width

Serviceability check on crack width, including the distinction between short-term and long-term action and the limits set by exposure conditions.

Deflection

Serviceability check on deflection, allowing for cracked-section stiffness and for the creep that develops under long-term load.

Detailing and anchorage

Minimum and maximum reinforcement, bar spacing, cover for durability, anchorage and lap lengths, and the detailing rules for beams, columns, slabs and walls.

When to use this standard

This is the standard to design to for any concrete or reinforced-concrete member on a Vietnamese project - beams, slabs, columns, walls, foundations and their detailing. Use it in place of Eurocode 2, not alongside it: the two use different material classifications and different partial factors, so mixing values between them is not valid.

How it fits with the other standards

Loads for a TCVN 5574 design come from TCVN 2737 (loads and actions); seismic actions come from TCVN 9386; foundations are designed to TCVN 9362 and piles to TCVN 10304; and construction of the concrete itself is governed by TCVN 4453.

What each section covers

Mục 1

Scope. The concrete and reinforced-concrete structures the standard applies to, and the temperature and environmental limits within which it is valid.

Mục 2

Normative references. The other standards this one depends on, including those for materials, loads and testing.

Mục 3

Terms, definitions and symbols. Definitions in 3.1 and the full symbol list in 3.2 - worth reading first, because the notation differs from Eurocode 2.

Mục 4

General requirements for concrete and reinforced-concrete structures, covering the basis of design before any calculation method is introduced.

Mục 5

Calculation requirements. Sets out the two groups of limit states: strength of normal, inclined and spatial sections and local load effects, then crack formation, crack width and deformation.

Mục 6

Materials. Concrete quality indices, characteristic and design strengths, deformation properties and stress-strain diagrams (6.1), and the same set for reinforcement (6.2).

Mục 7

Plain concrete structures. Strength of members without reinforcement, including eccentric compression and bending by the limiting internal force method.

Mục 8

Non-prestressed reinforced concrete - the longest section and the one used most. First limit states in 8.1 (bending and axial force, shear, torsion, local compression, punching, slabs and walls); second limit states in 8.2 (cracking and deformation).

Mục 9

Prestressed concrete. Prestress in the reinforcement (9.1), then the first limit states including the transfer stage (9.2) and the second limit states including curvature by the nonlinear deformation model (9.3).

Mục 10

Detailing requirements. General and geometric requirements, then reinforcement arrangement in 10.3 - cover, minimum clear spacing, longitudinal and transverse bars, anchorage, laps and bent bars - and detailing of primary members in 10.4.

Mục 11

Repair and strengthening. Survey of the existing structure, check calculations, and the design of strengthening measures.

Mục 12

Fatigue. Design of reinforced-concrete structures subjected to repeated loading.

Phụ lục A

Normative annex relating the different concrete compressive strength measures to one another.

Phụ lục B

Informative annex giving the concrete stress-strain diagrams used in the deformation model.

Phụ lục C

Informative annex on the use of particular reinforcement types.

Phụ lục D

Informative annex on the design of cast-in embedded parts.

Phụ lục E

Informative annex on the analysis of structural systems.

Phụ lục F

Informative annex on the design of annular and circular columns.

Phụ lục G

Informative annex on the design of concrete shear keys.

Phụ lục H

Informative annex on the design of short corbels.

Phụ lục I

Informative annex on the design of semi-precast structures.

Phụ lục K

Informative annex on confinement reinforcement in eccentrically compressed members analysed by the nonlinear deformation model.

Phụ lục L

Normative annex giving the coefficients for the elasto-plastic section modulus of common section shapes.

Phụ lục M

Normative annex giving the deflection and displacement limits a structure must satisfy.

Phụ lục N

Normative annex classifying the duty groups of overhead travelling and suspended cranes.

Related standards

Tools that implement this standard