ISO 15928-2:2015

Houses — Description of performance — Part 2: Structural serviceability

ISO 15928-2:2015 sets out a method for describing the structural serviceability performance of houses. It covers objectives, provides performance descriptions, establishes parameter descriptions and outlines evaluation processes. ISO 15928-2:2015 is intended for use in the evaluation of the design and construction of houses, in the international trading of houses or their sub-systems, and in developing risk-management tools for the protection of houses. The ISO 15928‑ series does not specify a level of performance and it is not intended to provide a design method and/or criteria. NOTE 1 Annex A includes background information on this part of ISO 15928, guidance on its use, and suggestions on good practice. NOTE 2 Details on references referred to in Notes are provided in a Bibliography. NOTE 3 Structural safety, durability and other attributes are covered in other parts of ISO 15928.

Constructions d'habitation — Description des performances — Partie 2: Aptitude au service de la structure

General Information

• Status: Withdrawn
• Publication Date: 16-Aug-2015
• Withdrawal Date: 16-Aug-2015
• ICS: 91.040.01 - Buildings in general
• ICS: 91.080.01 - Structures of buildings in general
• Technical Committee: ISO/TC 59/SC 15 - Framework for the description of housing performance
• Drafting Committee: ISO/TC 59/SC 15 - Framework for the description of housing performance
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 04-Nov-2021

Relations

• Revises: ISO 15928-2:2005 - Houses — Description of performance — Part 2: Structural serviceability
• Effective Date: 03-Nov-2012

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15928-2
Second edition
2015-08-15
Houses — Description of
performance —
Part 2:
Structural serviceability
Constructions d’habitation — Description des performances —
Partie 2: Aptitude au service de la structure
Reference number
ISO 15928-2:2015(E)
©
ISO 2015

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ISO 15928-2:2015(E)

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© ISO 2015, Published in Switzerland
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ISO 15928-2:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Structural serviceability performance . 3
4.1 Objective . 3
4.2 Performance description . 3
5 Parameters for the description of performance . 3
5.1 Parameters for describing actions . 3
5.1.1 Permanent actions. 3
5.1.2 Imposed actions . 4
5.1.3 Wind actions . 4
5.1.4 Seismic actions . 4
5.1.5 Snow actions . . 5
5.1.6 Vibration sources . 5
5.1.7 Impact sources . 5
5.1.8 Actions derived from fittings . 5
5.1.9 Other actions . 5
5.1.10 Combinations of actions . 6
5.1.11 Ground conditions and movements . 6
5.2 Parameters for describing structural responses . 6
5.2.1 General. 6
5.2.2 Deformation . 6
5.2.3 Vibration . 7
5.2.4 Local damage . 7
5.2.5 Response to impact . . 7
5.2.6 Fittings . 7
6 Evaluation . 7
6.1 General . 7
6.2 Analysis. 8
6.3 Testing . 8
6.4 Service experience . 8
6.5 Combination . 8
Annex A (informative) Commentary . 9
Annex B (informative) Structural serviceability examples .16
Bibliography .18
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ISO 15928-2:2015(E)

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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 59, Buildings and civil engineering works,
Subcommittee SC 15, Performance description of houses.
This second edition cancels and replaces the first edition (ISO 15928-2:2005), which has been
technically revised.
ISO 15928 consists of the following parts, under the general title Houses — Description of performance:
— Part 1: Structural safety
— Part 2: Structural serviceability
— Part 3: Structural durability
— Part 4: Fire safety
— Part 5: Operating energy
The following part is under preparation:
— Part 6: Sustainable development contributions
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ISO 15928-2:2015(E)

Introduction
This part of ISO 15928 is one of a series of standards. The objective of the ISO 15928- series is to identify
the methods that will be used to describe the performance of houses. The ISO 15928- series is confined
to buildings occupied for residential purposes that may be separated or linked horizontally, but not
linked vertically, and which have their own access and do not share any common space.
Each part of ISO 15928 relates to a separate attribute. The parts of ISO 15928 do not specify levels
of performance and they are not intended to replace national standards or regulations, but provide a
standardized framework to be used for development of national standards and regulations consistent
with World Trade Organization (WTO) requirements. The parts of ISO 15928 do not provide design
methods and/or design criteria.
Based on the framework provided by the ISO 15928- series, purchasers, regulators and standards-
preparers in respective countries can describe their requirements in standardized performance terms,
as appropriate. Additionally, the manufacturers/providers can respond by describing the performance
of their products in a similar manner.
The purpose of this part of ISO 15928 is to provide a standardized system of describing performance
that can be used to specify performance requirements and performance levels, or to rate houses, in
terms of structural serviceability.
NOTE The WTO Agreement on technical barriers to trade, Clause 2.8, states: “Whenever appropriate,
members shall specify technical regulations based on product requirements in terms of performance, rather
than design or descriptive characteristics.”
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INTERNATIONAL STANDARD ISO 15928-2:2015(E)
Houses — Description of performance —
Part 2:
Structural serviceability
1 Scope
This part of ISO 15928 sets out a method for describing the structural serviceability performance of
houses. It covers objectives, provides performance descriptions, establishes parameter descriptions
and outlines evaluation processes.
This part of ISO 15928 is intended for use in the evaluation of the design and construction of houses, in
the international trading of houses or their sub-systems, and in developing risk-management tools for
the protection of houses.
The ISO 15928- series does not specify a level of performance and it is not intended to provide a design
method and/or criteria.
NOTE 1 Annex A includes background information on this part of ISO 15928, guidance on its use, and
suggestions on good practice.
NOTE 2 Details on references referred to in Notes are provided in a Bibliography.
NOTE 3 Structural safety, durability and other attributes are covered in other parts of ISO 15928.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2394, General principles on reliability for structures
ISO 6707-1, Buildings and civil engineering works — Vocabulary — Part 1: General terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2394, ISO 6707-1 and the
following, apply.
3.1
action
force acting on a structure, or cause of deformation imposed on a structure or constrained within it
Note 1 to entry: In North America, the term ‘load’ is preferred and used in place of ‘action’.
Note 2 to entry: In this part of ISO 15928, the term ‘load’ is used to indicate the value of a force corresponding to
an action.
Note 3 to entry: See ISO 6707-1:2014, 9.3.22 for the definition of ‘force’.
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3.2
component
part of a house that can be identified
EXAMPLE Floor, wall.
Note 1 to entry: Includes fittings.
3.3
equipment
device that is provided for use within a house
3.4
fitting
structure such as shelving, cupboards, equipment, etc., that is permanently fixed to the ceilings, walls,
etc., of a house
3.5
house
building occupied for residential purposes and designed as one unit (dwelling) with its own access
Note 1 to entry: The house can be a separate building, or linked horizontally with another house but not linked
vertically.
Note 2 to entry: Where houses are linked, each has its own access and does not share any space in common with
another.
Note 3 to entry: Where houses are linked, services including those related to energy usage and supply, heating
and ventilation may be shared.
Note 4 to entry: Where houses are linked, the wall between the houses is typically designed and constructed to
limit the probability of fire spread between houses.
Note 5 to entry: See ISO 6707-1:2014, 3.1.3 for the definition of ‘building’.
3.6
ground movement
displacement in any direction of the founding stratum by influences not solely dependent on the actions
applied by the housing carcass
3.7
objective
statement concerning the purpose of the description of performance which is to express user needs
3.8
parameters
group of variables used to quantitatively describe the structural
serviceability performance
3.9
performance
behaviour of houses related to use
3.10
representative value of an action
value used as a reference for the description of performance
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ISO 15928-2:2015(E)

4 Structural serviceability performance
4.1 Objective
The structural behaviour of a house, for normal use under all expected actions, that may affect the
occupants and the functioning of the house, shall be such that the following characteristics of a house
shall be kept within levels acceptable to the user:
a) functioning and appearance of the house and its components;
b) functioning of the occupants in the house;
c) functioning of the equipment in the house;
d) comfort of the occupants.
NOTE The relative importance of each of these characteristics varies and is reflected in the performance
requirements that are specified.
4.2 Performance description
The performance description is the ability of the whole house and its parts, with an appropriate degree
of reliability, to perform within established parameters under all expected actions for normal use in
terms of:
a) local damage, including cracking, (which can affect the efficiency and appearance of the house and
its components),
b) deformation (which can affect the efficient use or appearance of the house or the functioning of the
people and equipment),
c) vibration (which can cause discomfort or affect the activity of occupants or the functioning of
equipment).
The structural serviceability performance can be described by the structural actions on the house
under normal use and the structural responses under the effect of those actions. Only actions and
responses relevant to serviceability issues of concern need to be described.
NOTE 1 The appropriate degree of reliability can be judged with due regard to the possible consequences of
serviceability failure and the expense level of effort and procedures necessary to reduce those risk of failure.
Aspects that are important in achieving the proper degree of reliability include choice of structural systems,
design and analysis, durability design, quality control, maintenance and protective measures.
NOTE 2 Expected actions for normal use can include those arising from soil/structure interaction, probable
ground movements, compatibility of connections between subsystems and the effects of openings.
NOTE 3 For the purposes of this part of ISO 15928, the durability of materials is not considered to have a
bearing on the structural serviceability performance of the house.
NOTE 4 For design specification, it is necessary to nominate the levels of structural actions and the acceptable
limits of the structural responses corresponding to those levels of actions.
5 Parameters for the description of performance
5.1 Parameters for describing actions
5.1.1 Permanent actions
The permanent actions, other than self-weight, are described by the magnitude(s), expressed in
kilonewtons, and the location(s) of the imposed load(s).
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5.1.2 Imposed actions
The imposed actions are described by the representative values of one or more of the following:
a) uniformly distributed floor or roof load, expressed in kilonewtons per square metre;
b) concentrated floor or roof load, expressed in kilonewtons per specified area, expressed in square
metres;
c) concentrated wall impact load, expressed in kilonewtons, applied at a specified height, expressed
in metres, above the floor;
d) uniformly distributed horizontal line load, expressed in kilonewtons per metre, applied at a
specified height, expressed in meters, above the floor.
EXAMPLE A hand-rail.
NOTE ISO 2103[1] provides minimum recommended imposed actions for different types of use and
occupancy.
5.1.3 Wind actions
Wind actions are described by the representative value of the wind velocity, expressed in metres per
second, under normal conditions, derived from the basic wind speed, factored as appropriate to take
into account local effects, terrain, shielding, topography, site altitude and the like, based on one of the
following wind velocity types:
a) 3 s gust;
b) 1 min mean (fastest mile);
c) 10 min mean;
d) hourly mean.
NOTE ISO 4354[2] provides details on the conversion of wind velocity to wind forces and the conversion
between different types of wind velocity.
5.1.4 Seismic actions
Seismic actions are described by stating the representative value, under normal conditions, of one of
the following parameters:
a) effective peak ground acceleration, expressed as a fraction of gravity;
b) base shear coefficient;
c) horizontal force applied to the structure, in kilonewtons, and its location;
d) ground acceleration response spectrum for the site;
e) floor acceleration response (for equipment and fittings).
NOTE 1 Item e) relates to phenomena where equipment and/or fittings cannot be used due to the acceleration.
If either a) or b) is used, then the proportion of the imposed loads to be included in the seismic mass
shall also be nominated. The representative value shall be based on a consideration of the seismic
activity, the soil characteristics of the construction site and the response behaviour of the structure.
NOTE 2 ISO 3010[3] provides additional information on seismic action on structures.
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ISO 15928-2:2015(E)

5.1.5 Snow actions
The snow actions are described by stating the representative values, under normal conditions, of the
following:
a) ground snow depth, expressed in metres, derived from the basic snow depth, factored to take into
account local effects such as terrain, shielding, topography and the like;
b) snow density, expressed in kilograms per cubic metre, i.e., the density used in converting the
ground snow depth into a load;
c) duration, in days per year.
NOTE ISO 4355[4] provides information on the conversion of ground snow depths to roof snow loads.
5.1.6 Vibration sources
Consideration shall be given to the description of vibration sources inside and outside the house, such
as that caused by machinery, vehicular traffic and human activity, if these sources affect the occupants
of the house on a regular basis.
NOTE ISO 10137[5] provides information on the description of vibration sources.
5.1.7 Impact sources
If these impacts are likely to occur during normal use, consideration shall be given to the description of
impact sources due to human activities or the environment in terms of the following:
a) specified in mass, expressed in kilograms;
b) specified energy, expressed in joules;
c) type of impact (soft or hard body impact).
EXAMPLE Accidental human body impacts due to slip, trip and fall (soft body impact) and impacts of falling
objects (hard body impact).
NOTE ISO 7892[6] provides information on impact test on vertical building elements.
5.1.8 Actions derived from fittings
Consideration shall be given to the description of actions resulting from fittings in terms of a load,
expressed in kilonewtons, at a specific location, such as on a ceiling, on a wall or at a distance from a
wall.
EXAMPLE Examples of wall-mounted fittings are cupboards and mirrors, and of ceiling-mounted fittings,
lights and fans.
NOTE Depending on the situation, an action arising from “fittings” can be categorized as, for example, the
following:
a) imposed action;
b) vibration sources;
c) impact sources.
5.1.9 Other actions
Consideration shall be given to the description of other actions, if these actions are likely to affect the
structural serviceability of the house.
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ISO 15928-2:2015(E)

5.1.10 Combinations of actions
Consideration shall be given to the description of the combinations of the actions to account for the
probability of simultaneous occurrence of two or more actions.
5.1.11 Ground conditions and movements
The ground conditions and movements are described by stating the following:
a) representative values of bearing capacity, either as an allowable or ultimate value, expressed
in kilonewtons per square metre, for a given total and differential settlement, expressed in
millimetres;
b) nature and magnitude of expected ground movements, expressed in millimetres, expressed both
as a total surface movement and as a differential movement, arising from swelling, consolidation,
shrinkage or settlement of the subsoil;
c) representative stiffness of the soil, expressed in millimetres per kilopascal;
d) diameter, expressed in metres, and location of any soft spot over which a loss of support to the
house is likely to occur, or the distance from the perimeter of the house over which a loss of support
is likely to occur.
5.2 Parameters for describing structural responses
5.2.1 General
For serviceability considerations, structural responses under the effects of the actions can be described
in terms of parameters representing deformations, vibrations and local damages.
For design specification, structural serviceability limits under the effects of the actions can be
described in terms of limiting values that are based on characteristic values and partial factors for
materials. These values shall take into account of the variability of the material properties and the level
of reliability for serviceability limit states and the frequency of the actions.
5.2.2 Deformation
5.2.2.1 Deflection
Deflections (vertically, horizontally, in-plane, out-of-plane, terminal and medial) are described in terms
of the following:
a) deflection to span ratio or deflection over a defined length;
b) deflection to storey height ratio;
c) absolute value, expressed in millimetres.
NOTE 1 Deflection can also be used as a measure of rotation or curvature.
NOTE 2 ISO 4356[7] provides information on deformation of buildings at the serviceability limit states.
NOTE 3 Deflection can be described as elastic deformation and/or permanent deformation
(non-residual/residual).
Consideration should be given to long-term and short-term effects, e.g. creep.
5.2.2.2 Tilt
Tilting is described in terms of angular distortions.
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ISO 15928-2:2015(E)

5.2.3 Vibration
Vibration response is described in terms of the following:
a) frequency, expressed in hertz;
b) acceleration, expressed in metres per square second, velocity, expressed in metres per second, and
displacement, expressed in millimetres.
NOTE 1 Refer to ISO 10137 for guidance on serviceability of buildings against vibration.
NOTE 2 Vibrations for the house as a whole and its parts can have different values.
5.2.4 Local damage
Local damage is described in terms of cracking and spalling:
a) cracking:
— approximate crack width, expressed in millimetres;
— location and frequency of cracks.
b) spalling:
— approximate spall depth, expressed in millimetres, and area, expressed in square metres;
— location and frequency of spalls.
5.2.5 Response to impact
Response to impact is described in terms of the following:
a) permanent deformation;
b) permanent displacement in terms of a deflection ratio;
c) crack width and aggregate crack length, expressed in millimetres;
d) puncturing;
e) indentations or displacements, expressed in millimetres;
f) visible cracks of a given width and an aggregate length, expressed in millimetres.
5.2.6 Fittings
The performance of the house to support fittings is described in terms of the following:
a) its ability to support the actions specified in 5.1.8;
b) damage caused by the loosening and withdrawal of fixing devices.
6 Evaluation
6.1 General
Evaluation may be carried out by means of the following:
a) analysis;
b) testing;
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ISO 15928-2:2015(E)

c) service experience;
d) combination of the above.
NOTE For materials with recognized engineering properties, evaluation is usually carried out by analysis
using appropriate norms and standards.
6.2 Analysis
The assessment of distortions and vibrations of individual structural members shall be determined
by methods of structural analysis that take into account equilibrium, general stability, geometric
compatibility, and both short- and long-term material properties.
6.3 Testing
Testing shall incorporate a realistic representation of materials, loading conditions, boundary
conditions and construction practices. Testing for evaluating structural serviceability shall be full-
scale.
6.4 Service experience
Service experience shall comprise a sufficient number of representative examples, exposed to similar
or more severe service conditions, together with adequate documentation.
6.5 Combination
A combination of analysis, testing and service experience may be used for evaluation. Simplified
analytical procedures using a combination of testing and service experience may be used.
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ISO 15928-2:2015(E)

Annex A
(informative)

Commentary
A.1 Scope
The purpose of this part of ISO 15928 is to standardize the method of describing the structural
serviceability performance for housing, i.e. to standardize the parameters by which the structural
safety aspects of house performance
...