1、CEN ENx595 95 3404569 OLOb610 678 = BRITISH STANDARD Timber structures - Test methods - Test of trusses for the determination of strength and deformation behaviour The European Standard EN 595 : 1995 has the status of a British Standard BS EN 595 : 1995 CEN EN*595 95 3404589 OLOb11 504 Amd. No. Date
2、 BS EN 595 : 1995 Rxt affected This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 October 1995 O BSI 1995 The following BSI references relate to t
3、he work on this standard: Committee reference B/518/1 Draft for comment 91/18867 DC ISBN O 680 24614 O Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/518, Structural timber, to Subcommittee B/518/1, Test methods, upon
4、which the following bodies were represented: Department of the Environment (British Board of Agrment) Department of the Environment (Building Research Establishment) Institution of Civil Engineers Institution of Structural Engneers Timber Research and Development Association Wood Panel Products Fede
5、ration Coopted members CEN EN*595 95 3404589 OLObBL2 440 BS EN 595 : 1995 Contents Committees responsible Page Inside front cover National foreword ii Fore word 2 Text of EN 595 3 i CEN EN*595 95 m 3404589 OLOb813 387 BS EN 595 : 1995 National foreword This British Standard has been prepared by Subc
6、ommittee B/518/1 and is the Engiish language version of EN 595 : 1995 lmber structures - Dst methods - Dst of trusses for the determination of strength and deformation beh,av.iour published by the European Committee for Standardization (CEN). This British Standard supersedes clauses 32 to 38 and cla
7、use 40 of BS 5268 : 1985 Structural use of timber Part 3. Code of practice far tmcssed rafter roofs. These are in the process of being withdrawn by revision of BS 5268l). Compliance with a British Standard does not of itself confer immunity from iegai obligations. )in preparation. ii CEN EN*595 95 m
8、 3404589 OLOb814 213 4EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 595 March 1995 ICs 91.040.00 Descripton: Timber construction, mechanical tests, stiffness tests, determination, mechanical strength English version Timber structures - Test methods - Test of trusses for the determination of s
9、trength and deformation behaviour Structures en bois - Mthodes dessai - Essais des fermes pour la dtermination de la rsistance et de la rigidit Holzbauwerke - Prfverfahren - Prfung von Fachwerktrgern zur Bestimmung der Tragfhigkeit und des Verformungverhaltens This European Standard was approved by
10、CEN on 1994-12-05. CEN members are bound to comply with the CENCENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards ma
11、y be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Cen
12、tral Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European
13、 Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B- 1050 Brussels O 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 595 :
14、1995 E CEN EN*595 95 W 3404589 OLOb8L5 L5T Page 2 BS EN 595 : 1995 Foreword This European Standard has been prepared by the lkchnical Committee CEN/TC 124, Timber structures, of which the secretariat is held by DS. NOTE. It is considered desirable to maintain the same clause numbers consistently thr
15、oughout this series of standards. Consequently, some clauses are void in this edition of this standard, but it is envisaged that future editions may need to include text in these clauses. This European Standard shall be given the status of a national standard, either by publication of an identical t
16、ext or by endorsement, at the latest by September 1995, and conflicting national standards shall be withdrawn at the latest by September 1995. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland,
17、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Foreword 1 Scope 2 Normative references 3 Definitions 4 Symbols 5 Requirements 6 %st methods 6.1 Principle 6.2 Apparatus 6.3 Preparation of test pieces
18、 6.4 Procedure 6.5 Results 6.6 Test report page 2 3 3 3 3 3 3 3 3 3 3 5 5 CEN EN+595 95 = 3404589 OLOb8Lb 096 1 Scope This standard specifies the test procedures for determining the strength and deformation behaviour of trusses. NOTE. The test methods are based on EN 380. 2 Normative references None
19、. 3 Definitions None. 4 Symbols F applied load (in N) Fm, maximum applied load (in N) G characteristic permanent load composed of GI and G2 (in N) GI seif-weight of truss (in N) G2 applied permanent load (in N) Q characteristic value of variable load (in N) T loading time (in s) Tr recovery time (in
20、 s) 5 Requirements None. 6 Test methods 6.1 Principle The purpose of the test methods is to measure the deformation behaviour and strength of trusses subjected to the type of loading which may be expected in service. Uniformly distributed test loads may be simulated by applying point loads. 6.2 Appa
21、ratus 6.2.1 General The apparatus used for the test shall simulate the assumed or actual service conditions of the truss in respect of the truss span, the size, position and rigidity of the truss bearing and the lateral stability of the truss. 6.2.2 Lateral restraint Lateral restraint shall not affe
22、ct the vertical stiffness of the truss. Page 3 BS EN 595 : 1995 6.2.3 Load and deformation measurement The apparatus shall be capable of continuously applying and recording the loads F with an accuracy of f3 % of the load applied, or, for loads of less than O, 1 Fmax, with an accuracy of +0,3 % Fm,.
23、 The deformations shall be measured - to the nearest 0,l mm in the deformation test; and - to the nearest 1 mm in the strength test. Deformations shall be measured at all points considered important to the serviceability requirements of the truss. 6.3 Preparation of the test pieces The tests shall n
24、ormally be carried out on trusses which have been conditioned at the standard environment of (20 f 2) OC and (65 f 5) % relative humidity, but when other conditions apply, they shall be reported. The test laboratory shall normally be maintained at the standard environment, but when other conditions
25、apply, they shall be reported. The moisture content of the trusses shall be determined. 6.4 Procedure 6.4.1 General The loading procedures are shown diagrammatically in figure 1. The test loads shall be applied at a constant rate of movement at each loading point, avoiding impact or dynamic effects.
26、 A loading rate of 0,25Q per minute shall be used unless otherwise stated below. 6.4.2 Initial loading The initial loading procedure consists of applying the following loading regime to the truss. a) Only GI acting and F = O. Read deformation transducers. b) Apply F = C;. Measure deformations. e) Ma
27、intain F = G2 for a period of at least 1800 s. Measure deformations. d) Remove F. Measure deformations. e) Allow T, = 900 s. Measure deformations. 6.4.3 Load test 6.4.3.1 General This test procedure is in two parts: deformation test (see 6.4.3.2), and 24 h test (see 6.4.3.3), where both are performe
28、d immediately after the initial loading procedure. CEN EN*595 95 = 3404589 OLObL7 T22 M 4 I, - Page 4 BS EN 595 : 1995 77 I Load F GP+ Q G2 - F=O- i I I I I L 900 s -c- -4 Deformation test 24 h test II 31800s r-7 900 s Time * -1 Initial loading Load procedure test t c= II I I I I I Strength test -e
29、Figure 1. Loading procedures 6.4.3.2 Defomzation test The procedure consists of applying the following loading regime to the truss: f) Re-apply F = b) details of the sizes and configuration of the truss members; c) values of GI, G2 and &; d) conditioning and test laboratory environment; e) specifica
30、tion and quality of material used in the manufacture, with a note of any defects; f) specification of the mechanical fasteners (including corrosion protection), and their quantity and positioning; g) description of the bearings and lateral truss support in the test rig; h) description of the method
31、of loading the truss and of measuring the truss deformations; i) test loads sustained during the tests together with the corresponding deformations at all measurement positions; j) value of F,; k) type and position of failure; 1) moisture content at the point of failure. Attention shall also be draw
32、n to any observed defect in design or fabrication which may lead in time to abnormal reduction in the strength of the truss. CEN ENr595 75 m 3404589 OLOb8L9 8T5 BS EN 595 : 1995 BSI 389 Chiswick High Road London W4 4AL 9510-5-1.5k-FP BSI - British Standards Institution BSI is the independent nationa
33、l body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
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39、 Services, Membership at Chiswick: Tel: 0181 996 7002; Fax: 0181 996 7001. Copyright Copyright subsists in all BSI publications and no part may be reproduced in any form without the prior permission in writing of BSI. This does not preclude the free use, in the course of implementing the standard of
40、 necessary details such as symbols and size, type or grade designations including use by incorporation into computer programs, but where these details are reproduced including without limitation in printed form, in computer programs or in any other form whatsoever, the permission in writing of BSI must be obtained and if granted will be on terms including royalty, before the product is sold, licensed or otherwise exploited for commercial gain. Enquiries about copyright should be made to the Copyright Manager at Chiswick. ISBN O 580 24614 O Product code 00560933 B/518/1
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