© ISO 2016 Glass in building — Determination of the bending strength of glass — Part 4 Testing of channel shaped glass Verre dans la construction — Détermination de la résistance du verre à la flexion[.]
INTERNATIONAL STANDARD ISO 1288-4 First edition 2016-02-15 Glass in building — Determination of the bending strength of glass — Part 4: Testing of channel shaped glass Verre dans la construction — Détermination de la résistance du verre la flexion — Partie 4: Essais sur verre profilé Reference number ISO 1288-4:2016(E) © ISO 2016 ISO 1288-4:2016(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2016, Published in Switzerland All rights reserved Unless otherwise specified, no part o f 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 o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) Contents Page iv Scope Normative references Terms and definitions Symbols Apparatus 5.1 Testing machine 5.2 Measuring instruments Sample 6.1 Number of specimens 6.2 Specimen dimensions 6.3 Specimen condition Procedure 7.1 Determination of dimensions of each specimen 7.2 Bending test Evaluation Test report Annex A (informative) Properties of channel shaped glass Bibliography Foreword © ISO 2016 – All rights reserved iii ISO 1288-4:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso.org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f 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 in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity 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 in formation The committee responsible for this document is ISO/TC 160, Glass in building, Subcommittee SC 2, Use considerations ISO 1288 consists of the following parts, under the general title Glass in building — Determination of the bending strength of glass: — Part 1: Fundamentals of testing glass — f — (four point bending) — Part 4: Testing of channel shaped glass — f Part 2: Coa xial double rin g test on flat specim en s with large test sur ace areas Part 3: Test with specim en supported at two points Part 5: Coa xial double rin g test on flat specim en s with sm all test sur ace areas iv © ISO 2016 – All rights reserved INTERNATIONAL STANDARD ISO 1288-4:2016(E) Glass in building — Determination of the bending strength of glass — Part 4: Testing of channel shaped glass Scope T h i s p ar t o f I S O 8 s p e c i fie s a me tho d for de term i n i ng the b end i ng s treng th (defi ne d as the pro fi le bending strength) of wired or unwired channel shaped glass for use in buildings The limitations of this part of ISO 1288 are described in ISO 1288-1 Normative references T he fol lowi ng i nd i s p en s able c u ments , i n whole or i n p ar t, are normatively re ference d i n th i s c u ment a nd are for its appl ic ation For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c u ment (i nclud i ng any amend ments) appl ie s ISO 48, Rubber, vulcan ized or th erm oplastic — Determ in ation o f h ardn ess (h ardn ess between IRHD an d 00 IRHD) ISO 1288-1, Glass in building — Determination of the bending strength of glass — Part 1: Fundamentals of testing glass NOTE ISO TC 160 SC1 is still not certain as to whether there is a need for a standard on the product “Wired or unwired channel shaped glass” Terms and definitions For the pu r p o s e s o f th i s c u ment, the fol lowi ng term s and defi n ition s apply 3.1 profile bending strength quotient of the maximum bending moment and the section modulus of a channel shaped glass N o te to entr y: D ue to s ide ways movement o f the fl a nge s o f the ch a n nel s h ap e d p ro fi le i n the b end i ng te s t, the s p e c i men s b re a k a l mo s t e xclu s ivel y at the tra n s ition or the face from web to fl a nge (i e no t at the e x treme e dge o f the fl a n ge o f the web) C on s e quently, the p ro fi le b end i ng s treng th i s no t the gl a s s s treng th , but rather a va lue rep re s enti ng the s treng th o f the p ro fi le © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) Symbols B Fmax width of web maximum force NO T E G hF Where the b end i ng rol lers are no t fi rm ly attache d to the te s ti ng mach i ne, but are laid on the specimen, the force resulting from their weight is added to the maximum measured force specimen’s own weight th ickne s s o f fla nge hW thickness of web H height o f fl ange Ls MbB PbB m N distance between supporting rollers maximum bending moment pro fi le b end i ng s treng th Z section modulus ZF s e c tion mo du lu s with fla nge s i n ten s ion ZW 5 section modulus with web in tension N m m m m Nm Pa m3 m3 m3 Apparatus Testing machine The bending test shall be carried out using a suitable bending testing machine, which shall incorporate the following features a) The stressing of the specimen shall be capable of being applied from zero up to a maximum value in a manner which minimizes shock and is stepless b) T he s tre s s i ng device s l l b e c ap able o f the s p e ci fie d rate o f s tre s s i ng c) The testing machine shall incorporate a load measuring device with a limit of error of ±2,0 % within the measuring range d) The supporting rollers and the bending rollers (see Figure 2) shall have a diameter of 50 mm and a length of not less than 550 mm All the rollers shall be free to rotate e) The air bags (see Figure 2) shall have an overall dimension of 310 mm × 020 mm × 200 mm and shall have a safe working pressure not less than 100 kPa The air bags shall be pressurized to 70 kPa for channel shaped glass with a nominal width up to 300 mm and 50 kPa for channel shaped glass with a nominal width over 300 mm f) The spreader plates (see Figure f f ) s l l have d i men s ion s o robu s t to ade quately tran s m it the force 0 m m × 0 m m and b e s u fic iently i nto the a i r b ags © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) Measuring instruments The following measuring instruments are required: — a measuring instrument enabling the web width, B, of the specimen to be measured to the nearest H, of the specimen to be measured to the nearest 0,5 mm; f h F, and web, h W, to be measured to the nearest 0,1 mm m m a nd the fla nge height, — a me as u ri ng i n s tru ment a l lowi ng the th ickne s s o Sample 6.1 the s p e c i men fl ange, Number of specimens T he nu mb er o f s p e c i men s to b e te s te d s l l b e de term i ne d dep end i ng on the fidence l i m its re qu i re d, e s p e ci a l ly with regard to e s ti mati ng the e xtreme s o f the s treng th d i s tribution (s e e I S O 8 -1 discussion of numbers of specimens) 6.2 a Specimen dimensions The dimensions of the specimen web, B H, the web thickness, h W to be tested The length of the specimens shall be 100 mm ± mm , flange height, , the flange th ickne s s , and the angle b e twe en the web a nd the flange s s l l b e with i n the tolera nce s s p e c i fie d 6.3 for for , hF the pro duc t Specimen condition The specimens shall be stored in the testing environment (see 7.2) for at least h before being tested Key principal axis web flange Figure — Cross section of specimen © ISO 2016 – All rights reserved ISO 1288-4:2016(E) Procedure 7.1 Determination of dimensions of each specimen The width of the web, B f f Figure and Figure 2) , the height o at the end s o the fl ange, H , shall be measured , shall be measured hF hW , a nd the th ickne s s o f the flange s , the pro fi le s a nd i n the centre o f the s p e c i men T he web th ickne s s , on ly at the end s (s e e 7.2 Bending test The specimens shall be mounted as shown in Figure Key specimen bending roller supporting roller rubber pad air bag spreader plate foam slab L s 000 mm ± mm Figure — Arrangement of specimen in testing machine Rubber strips, mm thick and of hardness of not less than (40 ± 10) IRHD, (in accordance with ISO 48), shall be placed between the specimen and the supporting rollers © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) When te s ti ng with the web i n ten s ion, a fo am sl ab (exp a nde d p olys tyrene or s i m i lar) , no t le s s than 0 m m i n leng th and o f width 10 m m le s s th an the i nterna l s p ace b e twe en the fl ange s , sh a l l b e place d u nder the r b ag to prevent it from applyi ng the lo ad d i re c tly to the fla nge s T he b end i ng te s t s h a l l b e c a rr ie d o ut at (2 ± ) ° C with the rel ati ve hu m id ity b e twe en % a nd 70 % During the test, the temperature shall be kept constant to °C in order to avoid development of thermal stresses f f MPa/s until failure occurs The maximum force, Fmax, shall be measured and the time taken to reach this force shall be recorded T he s p e c i men s h a l l b e b ent with a u n i o r m ly i nc re a s i ng b end i ng s tre s s at a rate o (2 ± ,4) Evaluation T he pro fi le b end i ng s treng th , P bB = ( Fmax + G ) PbB , shall be calculated in accordance with Formula (1): LS 8Z (1) The appropriate value of section modulus, Z f in tension (ZF ) or the web is in tension (ZW ) The bending strength shall be calculated with the section modulus and weight for the nominal f f f exceeded Values for G, ZF and ZW are given in Annex A f , used d i men s ion s o or the c a lc u lation, dep end s on whe ther the fla nge i s the pro fi le, provide d that the p erm i s s ible d i men s iona l tolera nce s or the pro fi le are no t or a non- exhau s tive l i s t o com mon ly avai lab le cha n nel pro fi le s Where the p ermi s s ible d i men s iona l tolera nce s a re e xce e de d, the s e c tion mo du lu s a nd weight s l l b e c a lc u late d s ep a rately for e ach s p e c i men Test report The test report shall include the following information: a) a reference to this part of ISO 1288, i.e ISO 1288-4; b) de s crip tion o f the pro fi le, either b y trade na me or b y s p e ci fyi ng the nom i na l d i men s ion s o f web width, fl ange height, web th ickne s s a nd fl ange th ickne s s; In the case of channels with wire, include a description of the wire; c) the angle o f devi ation from a right a ngle, i f the app arent deviation o f the fl ange from a right a ngle i s vi s ua l ly app a rent; d) number of specimens; e) for each specimen: 1) me a s ure d th ickne s s e s o f flange s and web to the ne a re s t ,1 m m; 2) me a s ure d web width to the ne are s t m m and flange height to the ne a re s t , m m; 3) whe ther te s te d with fl ange or web i n ten s ion; 4) section modulus and weight used for calculation; PbB , in MPa to the nearest MPa; 6) time to breakage in seconds, to the nearest s No average for the measured results shall be given; f) the number of specimens not broken in accordance with Clause 8; 5) pro fi le s treng th, © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) g) any deviation from th i s p ar t o f I S O 8 wh ich may h ave a ffe c te d the re s u lts © ISO 2016 – All rights reserved ISO 1288-4:2016(E) Annex A (informative) Properties of channel shaped glass Table A.1 f f channel shaped glass products give s va lue s o the s el weight and s e c tion mo du lu s for s ome o f the more com mon ly ava i lable Table A.1 — Values of G, ZF and ZW for a non-exhaustive selection of commonly available channel sections Dimensions in millimetres Width of web Height of flange Glass thickness 232 232 262 262 270 331 331 498 748 41 60 41 60 40 41 60 41 41 7 6 6 © ISO 2016 – All rights reserved G N 89 117 98 127 100 119 151 169 245 ZF mm3 210 13 000 260 13 150 020 370 13 430 540 700 ZW mm 22 670 47 910 24 570 52 420 23 920 28 490 62 070 36 030 43 300 ISO 88-4: 01 6(E) Bibliography [1] ISO 16293-1, Glass in buildin g — Basic soda lim e silicate glass products — Part : Definition s an d general physical and mechanical properties © ISO 2016 – All rights reserved ISO 88-4: 01 6(E) ICS 81 040.2 Price based on pages © ISO 2016 – All rights reserved