EN 380-1993 en Timber Structures - Test Methods - General Principles for Static Load Testing《木结构的试验方法 静荷载试验的一般原则》.pdf

1、CEN EN*380 93- 3404589 0050bLq b5T EUROPEAN STANDARD EN 380 NORME EUROPENNE EUROPISCHE NORM July 1993 UDC 694.04 : 624 : O11 : 1 : 624.04 Descriptors: Timber construction, mechanical tests, static loads, tireaking loads English version Timber structures - Test methods - General principles for static

2、 load testing Structures en bois - Mthodes dessais - Principes gnraux dessais par chargement statique Belastungen Holzbauwerke - Prfverfahren - Allgemeine Grundstze fr die Prfung unter statischen This European Standard was approved by CEN on 1993-07-15. CEN members are bound to comply with the CENKE

3、NELEC 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 may be obtained on application to the Central Secretariat or to any

4、 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 Central Secretariat has the same status as the official versions. CE

5、N 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 Committee for Standardization Comit Europen de Normalisation Eur

6、opisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 380 : 1993 E CEN ENS380 93 W 3404589 0050bL5 596 W Page 2 EN 380 : 1993 Foreword This European Standard was prepared by CEN/TC 124 ?Timber structures?. It was app

7、roved for the CEN final voting by the Tc on 9th December 1991. This standard is one of a series of standards for test methods for building materials and components. It was prepared by a working group under the convenorship of NSAI. NOTE. It is considered desirable to maintain the same clause numbers

8、 consistently throughout 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 a text in these clauses. This European Standard shall be given the status of a national standard, either by publicatio

9、n of an identical text or by endorsement, at the latest by January 1994, and conflicting national standards shall be withdrawn at the latest by January 1994. The standard was approved and in accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this Euro

10、pean Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. No existing European Standard is superseded. Contents Foreword 1 Scope 2 Normative references 3 Definitions 4 Sy

11、mbols 5 General requirements 6 6.1 Principle 6.2 Number of tests 6.3 Apparatus 6.4 Preparation 6.5 Procedures 6.6 Results 6.7 Test report Test methods for static loading 3 3 3 3 3 3 3 3 3 4 4 5 5 CEN EN*38O 93 m 3404589 0050636 422 m 1 Scope This standard specifies the general principles to be adopt

12、ed for static load testing of timber structures. It is intended for use where it is necessary to verify by test that a structure complies with stated criteria. Relevant parts may be used for proof loading or for the testing of structures in service. This standard is not intended to be used for testi

13、ng of individual pieces of timber, individual joints or structural scaled models. 2 Normative references None. 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 maximum load Load at failure; or load where substantial deformation continues without further increase

14、in load; or the maximum load achieved up to a specified deformation or strain. 3.2 timber structure Member or assembly of members forming the whole or a part of a load bearing element of construction (e.g. a joist or a truss or a floor panel or a wall panel), 4 Symbols F Fmax Fmax, est G1 GZ Q T Tr

15、v load, in newtons maximum load, in newtons estimated maximum load, in newtons self weight of the structure, in newtons applied permanent load, in newtons characteristic value of variable load, in newtons loading time, in seconds recovery time, in seconds factor of less than unity modifying Fmax,est

16、 Page 3 EN 380 : 1993 5 General requirements Materials and workmanship in the structure shall be, as far as practicable, of the minimum quality and dimensions allowed by the relevant specification. The manufacture and assembly of the timber structure shall be representative of the production process

17、 likely to be used. The moisture and temperature conditions at the time of test shall be representative of the likely in-service conditions. Deviations may, however, be required for struct,ures composed of materials with different time-dependent properties to obtain the same failure mode as in pract

18、ice. 6 Test methods for static loading 6.1 Principle The principle of these test methods involves applying a stated regime of loading to a timber structure, over a stated period of time, and of observing the corresponding deformations and reporting the test results. 6.2 Number of tests Wherever poss

19、ible several identical structures of the same design shall be tested to permit the assessment of the variability of the test results. NTE. The number of structures to be tested and their method of selection will depend on the probable variability in manufacture, the required level of confidence and

20、the number of loading conditions to be applied. 6.3 Apparatus The accuracy of loading and of deflection and load measurement shall be within f 3 %. The test loading shall be both applied and resisted in a manner approximating to the actual service conditions. Eccentricities, other than those necessa

21、ry to simulate service conditions, shall be avoided at points of loading and reaction, and care shall be taken to ensure that no inadvertent restraints are present. CEN EN*3O 93 3404589 0050637 369 = 0 0-1 1-2 2-3 3-4 4-5 5-6 6 - 7* Page 4 EN 380 : 1993 Only GI acting, and F=O Apply F = G2 Maintain

22、F = Gz Remove 0,5 Q 1 120 L 120 2 120 Apply F = 6 + 0,5 Q Apply F = G2 + Q 2 240 Maintain F = G2 + Q 2 1 200 Increase F until I 600 VF max,est is reached 6.4 Preparation Determine the density and moisture content of the materials in the structure. When testing is carried out in a laboratory it shall

23、 be normally maintained at a relative humidity of (65 f 5) * and a temperature of (20 f 2) OC, unless required otherwise by the normal in-service condition of the test structure. Departures from the required values shall be reported. When testing is carried out other than in a laboratory e.g. in sit

24、u, the environmental conditions of temperature and relative humidity existing during the test shall be reported. 6.5 Procedures 6.5.1 Basic loading procedure The basic loading procedure consists of the procedural steps (0 - 7) described in table 1. A diagrammatic representation of the loading procedure is given in figure 1. %ble 1. Basic loading procedure Procedural Loading procedure Time, in steu seconds Oad t 18 I 43 I I I I I I I I I I I I I I I _- %+Q- - - I I I I I I & Tim e II Il Il Li Figure 1. Schematic loading procedures