INTERNATIONAL STANDARD IS0 8686 5 First edition 1992 08 15 Cranes Design principles for loads and load combinations Part 5 Overhead travelling and portal bridge cranes Apparels de levage B charge susp[.]
IS0 INTERNATIONAL STANDARD 8686-5 First edition 1992-08-15 Cranes - Design combinations Part : Overhead travelling principles and load and portal bridge cranes Apparels de levage B charge suspendue combinaisons de charge Partie : Ponts roulants for loads et ponts - Principes de calcul des charges et des portiques Reference number IS0 8686-5 : 1992 (El IS0 8585-5 : 1992 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies) The work of preparing International Standards is normally carried out through IS0 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 IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization 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 International Standard Cranes, Sub-Committee IS0 8686-5 was prepared by Technical SC 9, Bridge and gantry cranes Committee IS0 8686 consists of the following parts, under the general title Cranes ciples for loads and load combinations: - Part 1: General - Part 2: Mobile - Part 4: Jib cranes - Part 5: Overhead ISO/TC 96, Designprin- cranes travelling and portal bridge The design principles for loads and load combinations subject of IS0 8686-3 cranes of tower cranes will form the IS0 1992 All rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii INTERNATIONAL Cranes - Design combinations Part 5: Overhead travelling IS0 8585-5 : 1992 (El STANDARD principles for loads and load and portal bridge cranes Scope IS0 8306 : 1985, Cranes - Overhead travelling cranes andportal bridge cranes - Tolerances for cranes and tracks This part of IS0 8686 establishes the application of IS0 8686-l to overhead travelling and portal bridge cranes as defined in IS0 4306-l) and gives specific values for the factors to be used IS0 8686-l : 1989, Cranes - Design principles load combinations - Part 1: General Normative Definitions references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 8686 At the time of publication, the editions indicated were valid All standards are subject to revision, and parties to agreements based on this part of IS0 8686 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below Members of IEC and IS0 maintain registers of currently valid International Standards IS0 4302 : 1981, Cranes IS0 4306-I for loads and : 1990, Cranes IS0 4310 : 1981, Cranes Wind load assessment - - Vocabulary - Part I: General Test code and procedures For the purposes of this part of IS0 8686, the definitions in IS0 8686-l apply Symbols The symbols IS0 8686-l given used Application 5.1 The numerical table in this part of IS0 8686 are defined in of @ factors values for different @ factors are given in Table 1 - Loads Loads, combinations Load Categories of loads and load Load combinations E3 Load Partial Partial load factors f, A combinations Al A2 A3 A4 ,&;irs 81 B2 83 84 B5 Partial load factors YP YP Cl combinations C2 C3 C4 C C5 C6 C7 C8 Line No YP I Reslstance coefficient Coefficient for high-risk ym applications I,1 yn (see IS0 8686-l 1989, 7.3.61 I,05 20 21 IS0 6666-5 : 1992 (El 5.2 The I#I,, factors for dynamic effects which are used for load combinations shown in table are given in table Hoisting classes Some examples for the selection of hoisting classes according to IS0 8686-l : 1989, 6.1.2.1, are given in table Table ine No Q and on GP2 P3 P4 P5 Table Zeference to IS0 686-l : 1989 6.1 2.2 6123 6.1.3.2 and annex D 6.1.4 and annex E 6.1.5 a 6.2.1.1 6.2.1 6213 10 11 12 13 14 16 16 17 ia 6.2.2 $2 06 @7 rp5 @5 - - 6.1.2.2.2 3.1 6.3 3.3 6.3 6.3.5 6.3.6 637 d, r factors Values for factors &, or values for loads, or ,elevant International Standards Table Examples Hoistin! class Type of crane p, = f a, a = 0,l IS0 8686-l : 1989, hoisting classes IS0 8686-l The value of @4shall be estimated as shown in IS0 8686-l : 1989, annex D, if there are steps or gaps between the rails When using rigid body kinetic models : $5 = 1,2 if the acceleration and braking forces are changed with stepless control systems without backlash @s = I,5 in other control systems where the drive forces are acting on the crane practically free of backlash qjs = where considerable backlash exists When a displacement remain: within the limiting value specified ir IS0 8306, its effect can br neglected in the stress analysis Manual cranes ‘-‘Cl Power station cranes Erection cranes Workshop cranes Ship unloaders Stockyard cranes > Ship unloaders Stockyard cranes > HC2/HC with lifting beams, hooks or spreaders HC3 HC3/HC with grabs or magnets Ladle cranes Open-hearth furnace charging cranes Ingot charging cranes Soaking pit cranes HC3/HC :4 Stripper cranes Forge cranes “C4 The examples given in table represent typical applications, structural designs and hoist control systems More flexible load bearing systems and more sophisticated speed control systems may allow the selection of a lower hoisting class than indicated in table There may be cases where a higher hoisting class is appropriate IS0 4302 Regional snow- and ice-load ditions Ambient and localized temperatun variations IS0 8686-l : 1969, annex F, may bc used for guidance IS0 8686-l : 1989, hoisting classes IS0 IS0 IS0 IS0 - Combination of acceleration effects In the case of overhead travelling and portal bridge cranes, the load is moved by hoisting (H), travelling (Lt), traversing (Ct) and, possibly, by slewing (SI) mechanisms (See figure I.) 4302 8686-l and IS0 4310 8686-l 8686-l The acceleration effects of these mechanisms acting simultaneously on the crane depend on the control systems and service conditions of the crane and whether a load is hoisted from the ground or a suspended load is hoisted 05 = @5 = IS0 8686-l Figure IS0 8585-5 : 1882 (El Taking the above into account, the accelerations table are assumed to be acting simultaneously The gross loads shall be multiplied within combinations by the following factors: given the individual - load combinations Al and Bl : Q2 - load combinations A2 and 82: & - load combinations A3 and B3: - load combinations A4 and 84: G4 - load combination in b) for braking the steady-state c) or for braking the movement load d) for accelerating cess (positioning) for starting (1 +r#%xg When considering is combined with C3: G6 the movement, Table Hoisting Load Ship unloaders Stockyard cranes Steel mill cranes a grounded combinations Power station cranes Erection cranes Workshop cranes - Al, during the movement and the starting during process, the braking pro- Thus the calculated rigid body acceleration forces shall be multiplied by the factor G5 in accordance with IS0 8686-l : 1989, 6.1.4 Drive forces can change significantly in a short time interval Thus the accelerations shall be calculated a) movement, Combination of acceleration effects Hoisting Cl only one such effect In load combination C6 or C7, only the dynamic effects of the “emergency cut-out” or of the “failure of mechanism or components” shall be considered without other dynamic effects, assuming the case of starting during steady-state motion load Bl, the positioning effects, other movements Load combinations Power station cranes Erection cranes Workshop cranes a suspended A2 to A4, load B2 to B4, C3 Ship unloaders Stockyard cranes Steel mill cranes Is0 6666-5 : 1992 (El UDC Descriptors 621.674 : 624.642 : lifting equipment, Price based on pages cranes (hoists), travelling cranes, portal bridge cranes, loads (forces), rules of calculation