SIST ISO 15673:2011

INTERNATIONAL ISO
STANDARD 15673
First edition
2005-07-15
Guidelines for the simplified design of
structural reinforced concrete for
buildings
Lignes directrices pour la conception simplifiée du béton armé pour
les structures de bâtiments
Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Symbols and abbreviated terms . 12
4.1 Symbols . 12
4.2 Abbreviated terms . 17
5 Design and construction procedure. 18
5.1 Procedure . 18
5.2 Design documentation . 20
6 General provisions . 20
6.1 Limitations. 20
6.2 Limit states . 22
6.3 Ultimate limit state design format. 22
6.4 Serviceability limit state design format. 24
7 Specific provisions. 24
7.1 Structural systems and layout . 24
7.2 Actions (loads) . 29
7.3 General reinforced concrete requirements. 31
7.4 Floor system. 69
7.5 Solid slabs supported on girders, beams, joists or structural concrete walls . 79
7.6 Girders, beams and joists. 106
7.7 Columns. 131
7.8 Lateral force resistance . 143
7.9 Structural concrete walls . 157
7.10 Foundations . 165
Annex A (normative) Equivalent equations for material factors. 168

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15673 was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-stressed
concrete, Subcommittee SC 5, Simplified design standard for concrete structures.
iv © ISO 2005 – All rights reserved

Introduction
The aim of this International Standard is to provide rules for the design and construction of low-rise concrete
structures of small floor area to be built in the less developed areas of the world. The document is developed
for countries that do not have existing national standards. This document shall not be used in place of a
national standard unless specifically considered and accepted by the national standard body or other
appropriate regulatory organization. The design rules are based in simplified worldwide-accepted strength
models. The document is self-contained; therefore actions (loads) and simplified analysis procedures are
included, as well as minimum acceptable construction practice guidelines.
The minimum dimensional provisions contained in this document are intended to account for undesirable side
effects that will require more sophisticated analysis and design procedures. Material and construction
provisions are aimed at site-mixed concrete as well as ready-mixed concrete, and steel of the minimum
available strength grades.
The earthquake-resistance provisions are included to account for the fact that numerous underdeveloped
regions of the world occur in earthquake-prone areas. The earthquake resistance is based upon the
employment of structural concrete walls (shear walls) that limit the lateral deformations of the structure and
provide for its lateral strength.
The document contains provisions that can be modified by the national standards body due to local design
and construction requirements and practices. The specifications that can be modified are indicated using
[“boxed values”]. The authorities in each member country are expected to review the “boxed values” and may
substitute alternative definitive values for these elements for use in the national application of the document.
A great effort was made to include self-explanatory tables, graphics, and design aids to simplify the use of the
document and provide foolproof procedures. Notwithstanding, the economic implications of the conservatism
inherent in approximate procedures as a substitution to sound and experienced engineering should be a
matter of concern to the designer who employs the document, and to the owner who hires him.

INTERNATIONAL STANDARD ISO 15673:2005(E)

Guidelines for the simplified design of structural reinforced
concrete for buildings
1 Scope
This International Standard applies to the planning, design and construction of structural reinforced concrete
structures to be used in new low-rise buildings with restricted occupancy, number of stories, and area. The
purpose of this International Standard is to provide a registered civil engineer or architect with sufficient
information to design the reinforced-concrete structural framing of a low-rise building that complies with these
limitations; see 6.1. The rules of design as set forth in the present document are simplifications of the more
elaborate requirements.
This document may be used as an alternative to the development of a national concrete building code, or
equivalent document, in countries where no national design codes themselves are available, or as an
alternative to the national concrete building code in countries where it is specifically considered and accepted
by the national standard body or other appropriate regulatory organization.
Although the provisions contained in this document were established to produce, when properly employed, a
reinforced concrete structure with an appropriate margin of safety, this International Standard is not a
substitute for sound and experienced engineering. In order for the resulting structure designed in accordance
with these provisions to attain the intended margin of safety, the document must be used as a whole, and
alternative procedures should be employed only when explicitly permitted by the provisions. The minimum
dimensional provisions as prescribed in the document replace, in most cases, more elaborate procedures
such as those prescribed in the national building code, and an eventual economic impact is realized from the
simplicity of the procedures prescribed.
The professional performing the structural design in accordance with this International Standard should meet
the legal requirements for structural designers in the country of adoption and have training and a minimum of
appropriate knowledge of structural mechanics, statics, strength of materials, structural analysis, and
reinforced concrete design and construction.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 679, Methods of testing cements — Determination of strength
ISO 680, Cement — Test methods — Chemical analysis
ISO 863, Cement — Test methods — Pozzolanicity test for pozzolanic cements
ISO 2103, Loads due to use and occupancy in residential and public buildings
ISO 2633, Determination of imposed floor loads in production buildings and warehouses
ISO 3010, Basis for design of structures — Seismic actions on structures
ISO/TR 3956, Principles of structural fire-engineering design with special regard to the connection between
real fire exposure and the heating conditions of the standard fire-resistance test (ISO 834)
ISO 4354, Wind actions on structures
ISO 4355, Bases for design of structures — Determination of snow loads on roofs
ISO 6274, Concrete — Sieve analysis of aggregates
ISO 6782, Aggregates for concrete — Determination of bulk density
ISO 6783, Coarse aggregates for concrete — Determination of particle density and water absorption —
Hydrostatic balance method
ISO 6935-1, Steel for the reinforcement of concrete — Part 1: Plain bars
ISO 6935-2, Steel for the reinforcement of concrete — Part 2: Ribbed bars
ISO 6935-3:1992, (as amended in 2000), Steel for the reinforcement of concrete — Part 3: Welded fabric
ISO 7033, Fine and coarse aggregates for concrete — Determination of the particle mass-per-volume and
water absorption — Pycnometer method
ISO 9194, Bases for design of structures — Actions due to the self-weight of structures, non-structural
elements and stored materials — Density
ISO 9597, Cements — Test methods — Determination of setting time and soundness
ISO 10144, Certification scheme for steel bars and wires for the reinforcement of concrete structures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
acceleration of gravity
g
acceleration produced by gravity at the surface of earth
NOTE For the purposes of this International Standard, its value can be approximated as g ≈ [10] m/s .
3.2
admixture
material other than water, aggregate, or hydraulic cement, used as an ingredient of concrete and ad
...