ISO 11662-2:2014

INTERNATIONAL ISO
STANDARD 11662-2
First edition
2014-11-01
Mobile cranes — Experimental
determination of crane
performance —
Part 2:
Structural competence under static
loading
Grues mobiles — Détermination expérimentale des performances des
grues —
Partie 2: Compétence structurale sous le chargement statique
Reference number
©
ISO 2014
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 3
5 Limitations . 5
6 Method of loading . 5
6.1 Suspended load. 5
6.2 Side load (SL). 5
6.3 Deflection criteria . 6
7 Facilities, apparatus, and material . 9
8 Preparation for test . 9
9 Test procedure and records .10
9.1 Final test preparation .10
9.2 Zero stress condition .10
9.3 Dead load stress condition .10
9.4 Working load stress .10
9.5 Overload test condition .11
10 Stress evaluation .11
10.1 Class I — Uniform stress areas .12
10.2 Class II — Stress concentration areas .12
10.3 Class III — Column buckling stress areas .12
10.4 Class IV — Local plate buckling areas .13
Annex A (normative) Strength of materials .14
Annex B (normative) Column buckling stress .17
Annex C (normative) Test conditions and strength margins .24
Annex D (informative) Report format .33
Annex E (informative) Typical crane examples .35
Bibliography .40
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 96, Cranes, Subcommittee SC 6, Mobile Cranes.
ISO 11662 consists of the following parts, under the general title Mobile cranes — Experimental
determination of crane performance:
— Part 1: Tipping loads and radii
— Part 2: Structural competence under static loading
iv © ISO 2014 – All rights reserved

Introduction
When design calculations are made for mobile cranes, they are based on an ideal model in which all
members and components are perfectly straight and fabrication has been exact. For tension members
and members subjected to bending, the difference between the real crane and the ideal model is usually
not significant. But, for compression members subject to column buckling, an allowance for deviation in
straightness and fabrication is necessary.
When mobile cranes are tested non-destructively by means of strain gauges, the stresses determined
intrinsically include these effects of deviations in straightness and accuracy of fabrication.
This test method is intended to describe the approximate maximum loading conditions to which any
component of the entire load-supporting structure of a crane is subjected (See Annex D). In some
cases, a more severe loading condition(s) can be indicated by analysis. In these cases, the more severe
condition(s) can be added to or substituted for the specified test loading condition(s). This test method
also classifies stress areas as Types I (Uniform Stress Areas), II (Stress Concentration Areas), III (Column
Buckling Areas), and IV (Local Plate Buckling Areas; see Clause 10), and defines limits for each class.
Results can be used to correlate boom system calculation results for Class III stress areas as given by
boom system calculations. Test results for Class I stress areas throughout the structure can be used to
check any available calculations. This test method evaluates Class II stress areas for which calculations
are seldom available. Class IV stress areas, where disproportionately high stress readings can occur, can
be reviewed for better insight by calculation methods.
A production boom system that has been rated by the methods of this part of ISO 11662 can be used
on another machine without re-testing by the methods specified herein, provided the same analytical
procedure shows its stress levels will be less than or equal to the stress levels in the original application,
and provided that the supporting structure is as rigid as the original mounting. Rigidity of the supporting
structure is determined by the change in the slope of the jib foot axis as test loads are applied.
INTERNATIONAL STANDARD ISO 11662-2:2014(E)
Mobile cranes — Experimental determination of crane
performance —
Part 2:
Structural competence under static loading
1 Scope
This part of ISO 11662 applies to mobile construction-type lifting cranes utilizing
a) rope supported, lattice boom attachment or lattice boom, and fly jib attachment (see Annex E,
Figure E.3),
b) rope supported, mast attachment and mast mounted boom, and fly jib attachment (see Annex E,
Figures E.1 and E.2), or
c) telescoping boom attachment or telescopic boom and fly jib attachment (see Figure E.4).
Mobile crane manufacturers can use this part of ISO 11662 to verify their design for the mobile crane
types illustrated in Figures E.1 through E.4.
This test method is to provide a systematic, non-destructive procedure for determining the stresses
induced in crane structures under specified conditions of static loading through the use of resistance-
type electric strain gauges, and to specify appropriate acceptance criteria for specified loading
conditions.
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 9373:1989, Cranes and related equipment — Accuracy requirements for measuring parameters during
testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
strain
relative elongation or compression of material at any given point with respect to a specific plane passing
through that point, expressed as change in length per unit length (m/m)
3.2
stress
S
internal force per unit area resulting from strain, expressed in pascals (Pa) or newtons/square meter
Note 1 to entry: For this document, megapascals (Mpa) will be used for brevity.
3.3
yield point
S
y
stress at which a disproportionate increase in strain occurs without a corresponding increase in stress
Note 1 to entry: For purposes of this code, yield point is to be considered as the minimum 0,2 % offset tensile yield
point or yield strength specified by the appropriate standard for the material used.
3.4
critical buckling stress
S
cr
average stress which produces an incipient buckling condition in column-type members (See Annex C)
3.5
initial reference test condition
defined no-stress or zero-stress condition of the crane structure after the “break-in” as established by
a) supporting the structure on blocking to minimize the effects of gravity, or
b) the crane structure components in an unassembled state or any alternate method that will establish
the zero-stress condition. Under this condition, the initial reference reading for each gauge is
obtained, N
3.6
dead load stress condition
completely assembled crane structure on the test site and
...