1、 Reference number ISO 22389-1:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 22389-1 First edition 2010-05-15 Timber structures Bending strength of I-beams Part 1: Testing, evaluation and characterization Structures en bois Rsistance la flexion des poutres en I Partie 1: Essais, valuation et caractrisat
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6、O at the address below or ISOs 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedISO 22389-1:2010(E) ISO 2010
7、 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Materials .2 4.1 Flange stock.2 4.2 Web material 2 4.3 Adhesives.3 5 Product evaluation 3 5.1 General .3 5.2 Characteristic shear capacity 4 5.3 Characteristic bearing capac
8、ity .6 5.4 Characteristic bending capacity 12 5.5 Characteristic bending stiffness and creep14 5.6 Web openings and other considerations15 5.7 Flange tension tests15 5.8 End joint tension tests16 Annex A (informative) Analytical method for I-beam bending capacities 17 Annex B (informative) Failure c
9、oding in tests of prefabricated wood-based I-beams20 Bibliography23 ISO 22389-1:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Sta
10、ndards 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
11、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 3. Draft International Standards adopted
12、 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
13、rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22389-1 was prepared by Technical Committee ISO/TC165, Timber structures. ISO 22389 consists of the following part, under the general title Timber structures Bending strength of I-beams: Part 1: Testing, eva
14、luation and characterization Component performance and manufacturing requirements is to form the subject of a part 2. This part of ISO 22389 is based, with permission of ASTM International, on ASTM D 5055, Standard Specification for Establishing and Monitoring Structural Capacities of Prefabricated
15、Wood I-Joists, copyright ASTM International. ISO 22389-1:2010(E) ISO 2010 All rights reserved vIntroduction Prefabricated wood-based I-beams are being produced in many countries under different national standards and these products are being exported from one country to another. While the national s
16、tandards have many similarities, there are also many areas of dissimilarity. Consequently, there is need for the development of an International Standard to establish consistency between these standards to ensure the suitability of prefabricated wood-based I-beams for structural end-use applications
17、 regardless of country of manufacture or country of end use. It is intended that the development of this part of ISO 22389 will have value to industry, consumers, governments and distributors. INTERNATIONAL STANDARD ISO 22389-1:2010(E) ISO 2010 All rights reserved 1Timber structures Bending strength
18、 of I-beams Part 1: Testing, evaluation and characterization 1 Scope This part of ISO 22389 specifies the requirements for prefabricated wood-based I-beams used as structural members in bending applications. It gives procedures for establishing and evaluating structural capacities of prefabricated w
19、ood-based I-beams. The capacities considered are shear, moment, stiffness, bearing, and flange tension and compression. Procedures for establishing common details are given and certain end-use considerations specific to wood- based I-beams are itemized. Wood-based I-beams tested according to this pa
20、rt of ISO 22389 are intended for use under covered conditions and utilize components that are able to resist the effects of moisture on structural performance due to construction delays or other conditions of similar severity, but are not intended to be permanently exposed to the weather. This part
21、of ISO 22389 is not applicable to fire performance, formaldehyde requirements and biological durability. It does not cover manufacturing requirements for prefabricated wood-based I-beams. NOTE Procedures set out in this part of ISO 22389 are applicable to I-beams defined by a standard or a manufactu
22、rers specification that includes requirements for the flanges, webs and bonding, and production controls, including ongoing conformity assessment. This part of ISO 22389 does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of t
23、his part of ISO 22389 to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A specific precautionary statement is given in 5.1.5. 2 Normative references The following referenced documents are indispensable for the application of
24、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 20152-1, Timber structures Bond performance of adhesives Part 1: Basic requirements EN 789, Timber structures Test method
25、s Determination of mechanical properties of wood based panels ASTM D2915, Standard Practice for Evaluating Allowable Properties for Grades of Structural Lumber ASTM D5456, Standard Specification for Evaluation of Structural Composite Lumber Products ISO 22389-1:2010(E) 2 ISO 2010 All rights reserved
26、3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 prefabricated wood-based I-beam structural member manufactured using sawn or structural composite lumber flanges and structural panel webs, forming an “I” cross-sectional shape, bonded together
27、with a structural wood adhesive that possesses the moisture resistance suitable for the conditions specified NOTE 1 These members are primarily used as joists in floor and roof construction. NOTE 2 Suitable moisture resistance means resistance under covered conditions and possible exposure to moistu
28、re due to construction delays or other conditions of similar severity, but not permanent exposure to the weather. 3.2 characteristic strength and stiffness population 5th percentile strength value at a 75 % confidence level or the 50th percentile (mean) for bending stiffness value when determined us
29、ing the test specified in this part of ISO 22389 3.3 structural composite lumber composite of wood elements bonded with a structural wood adhesive that possesses the moisture resistance suitable for the conditions specified and intended for structural use in dry service conditions NOTE 1 Examples of
30、 wood elements include wood strands, strips, veneer sheets or a combination thereof. NOTE 2 Suitable moisture resistance means resistance under covered conditions and possible exposure to moisture due to construction delays or other conditions of similar severity, but not permanent exposure to the w
31、eather. 4 Materials 4.1 Flange stock When the flange material is structural composite lumber, the following properties shall be determined in accordance with ASTM D5456 or EN 789: a) modulus of elasticity; b) tension parallel to grain; c) compression parallel to grain; d) compression perpendicular t
32、o grain. NOTE National standards or governing codes can be applicable to all flange material. End joints in purchased flange stock are permitted, provided such joints conform to the general intent and 5.8. 4.2 Web material Web materials covered by this part of ISO 22389 are intended for end-use cond
33、itions specified in the Scope (third paragraph) and 3.1, Note 2. NOTE Manufacturing or performance standards of wood-based panels recognized by national standards or governing codes can be applicable to web materials. ISO 22389-1:2010(E) ISO 2010 All rights reserved 34.3 Adhesives Adhesives used to
34、fabricate components as well as the finished products shall conform to ISO 20152-1. NOTE National standards or governing codes can be applicable. 5 Product evaluation 5.1 General Product evaluation shall be conducted for establishing the characteristic capacities of prefabricated wood-based I-beams
35、for use in building design. In addition, product evaluation shall be conducted for certain common I-beam details since they often influence the I-beam characteristic capacities. 5.1.1 Sample size The number of specimens specified in this part of ISO 22389 is a minimum. The use of a larger number of
36、samples may be evaluated using ASTM D2915 or an applicable International Standard 1) . 5.1.2 Specimens Materials and fabrication procedures of specimens shall be as typical of intended production as can be obtained at the time of manufacturing the specimens. Specimens shall be tested at indoor ambie
37、nt laboratory conditions, which shall be reported. It is recommended that preliminary tests be conducted to aid the selection of representative specimens. 5.1.3 Test accuracy Tests in accordance with this part of ISO 22389 shall be conducted in a machine or apparatus calibrated to an error not excee
38、ding 2,0 %. 5.1.4 Test methods Methods generally applicable to the full-size I-beam tests required in this part of ISO 22389 shall consider the following: a) the methods are applicable to both product evaluation and quality control; b) load rate shall be as specified in the following subclauses; c)
39、delays between load increments are not required. 5.1.5 Test safety All full-scale mechanical tests are potentially hazardous and appropriate safety precautions shall be observed at all times. Appropriate lateral restraint shall be provided at all times during full-size I-beam tests to prevent latera
40、l buckling. 1) It is intended to develop an International Standard on the evaluation of characteristic values for structural timber. ISO 22389-1:2010(E) 4 ISO 2010 All rights reserved5.2 Characteristic shear capacity 5.2.1 Characteristic shear capacity shall be established from test results obtained
41、 in accordance with this part of ISO 22389. 5.2.2 Web factors that influence characteristic shear capacities and include web type, thickness, orientation, grade, web to flange joint and joint type in web (machined, butted, glued or not, reinforced), shall be tested in accordance with this subclause.
42、 5.2.2.1 Each combination of these web factors shall be tested separately, unless the critical combination in a proposed grouping is first established by test. Flange stiffness influences characteristic shear capacities. 5.2.2.2 If a range of flange sizes is intended to be used with a given combinat
43、ion of web factors, all sizes shall be tested unless all values are intended to be based on tests with the least stiff flange. 5.2.2.3 When it is intended to group a range of species or grades of either sawn or structural composite lumber flanges, preliminary tests shall be conducted to determine wh
44、ich is critical to the performance of the I- beam. 5.2.2.4 I-beams with structural composite lumber flanges shall be tested separately from joists with sawn lumber flanges. 5.2.3 For each web factor combination identified in 5.2.2, a minimum of 10 specimens shall be tested for each critical joist de
45、pth. Critical joist depths are minimum and maximum product depths with approximate 102 mm depth increments in between. If the installation of specific reinforcement, as defined in the manufacturers handbook, is required at a certain depth to maintain product performance in the progression of a serie
46、s of depths within a combination, the product shall be tested at this depth plus the adjacent depth, which does not require specific reinforcement. 5.2.4 Specimen length shall be that which usually produces failures in shear and shall not extend past each bearing support by more than 6,4 mm. The bea
47、ring length shall be adequate to usually produce shear failure instead of a bearing failure, but shall not exceed 102 mm, unless justified. There shall be a minimum horizontal distance of 1 1/2 times the joist depth between the face of the support and the edge of the load pad. NOTE Typical I-beam fa
48、ilure modes are shown in Annex B. 5.2.5 On one end of the specimen, a vertical web joint, if used, shall be located approximately 305 mm from the face of the support or half the distance between the support and the load pad. 5.2.6 The load shall be applied to the top flange either as a single-point
49、load at centre span or as two-point loads of equal distance from the centre span. Load pads shall have a sufficient length to prevent local failure. 5.2.7 The load shall be applied at a uniform rate, such that anticipated failure occurs in not less than 1 min. 5.2.8 Any required web reinforcements shall be installed at supports. When required to prevent failure at a load point, additional reinforcement shall be installed, provided such reinforcement is not wider than the load pad. 5.2.9 Ultimate load and mode of failure s
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