共找到 1301 条与 木材、原木和锯材 相关的标准,共 87 页
BS ISO 19474. Round timber. Visual characteristics. Methods of determination
Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements; German version EN 14081-1:2016
Timber structures. Strength graded structural timber with rectangular cross section. General requirements
This European Standard specifies a method of strength grading tropical hardwood visually for structural use. The permissible limits of characteristics for a single visual strength grade of timber are specified, designated "Structural Tropical Hardwood" (STH) grade. The method is only suitable for pieces of timber with a rectangular cross-section that is constant along their lengths. Characteristics related to durability are not covered in this standard. For some end uses, additional requirements may be specified at the time of grading, e. g. sapwood exclusion.
Structural timber - Visual strength grading of tropical hardwood
BS ISO 13061-15. Physical and mechanical properties of wood. Test methods for small clear wood specimens. Part 15. Determination of radial and tangential swelling
BS ISO 13061-16. Physical and mechanical properties of wood. Test methods for small clear wood specimens. Part 16. Determination of volumetric swelling
This European Standard establishes a system of strength classes for general use in design codes. It gives characteristic strength and stiffness properties and density values for each class to which EN 14081-1 refers. This standard is applicable to all softwood and hardwood timber for structural use, within the scope of EN 14081-1.
Structural timber - Strength classes
This European Standard specifies requirements for strength graded structural timber with rectangular cross-sections either visual or machine graded, shaped by sawing, planning or other methods and with cross-sectional dimensions complying with EN 336 (referred to as structural timber in the following clauses). This European Standard includes provisions for test methods, Assessment and Verification of Constancy of Performance and marking of structural timber. NOTE 1 For machine strength graded timber additional provisions for type testing (TT) are given in EN 14081-2 and for factory production control (FPC) in EN 14081-3. NOTE 2 An acceptance procedure for verification of a lot is given in EN 14358 which may be used for a delivery of structural timber. This European Standard identifies characteristics for which limits have to be given in visual grading standards. This European Standard covers structural timber, untreated or treated against biological attack. This European Standard does not cover:- timber treated by fire retardant products to improve its fire performance; - thermally and/or chemically modified timber; - structural finger jointed timber.
Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements
Round timber of hardwood species. Specifications
4.1 The procedures described in this practice are intended to be used to establish allowable stress and modulus of elasticity values for solid sawn, visually graded dimension lumber from In-Grade type test data. These procedures apply to the tested and untested sizes and grades when an adequate data matrix of sizes and grades exists. In addition, the methodology for establishing allowable stress and modulus of elasticity values for combinations of species and species groups is covered. Allowable stress and modulus of elasticity values may also be developed for a single size or a single grade of lumber from test data. 4.2 Methods for establishing allowable stress and modulus of elasticity values for a single size/grade test cell are covered in Practice D2915. The appropriateness of these methods to establish allowable stress and modulus of elasticity values is directly dependent upon the quality and representativeness of the input test data. 4.3 A monitoring program shall be established to periodically review the continued applicability of allowable properties derived by this practice. A monitoring program will establish data sets that are either the same as, above, or below the data that was used to develop the current allowable properties. Upon detection of a statistically significant downward shift, evaluation of the data and confirmation of remedial actions shall be undertaken. When evaluation is not undertaken or the results of the evaluation indicate an adjustment to allowable properties is appropriate, a reassessment shall be conducted to re-establish allowable properties. Note 5: It is recognized that over time there is the potential for changes in the raw material or product mix. In response to this a monitoring program must be conducted to ensure design values derived by this practice are not invalidated by such changes. If the data collected with a monitoring provides evidence of an statistically significant downward shift in lumber properties an evaluation program in accordance with the procedures of this practice is needed to detect and confirm that responses to such changes are appropriate. Evaluation, if undertaken, provides a means for responding to the data and assessing if the actions taken are sufficient. Following the confirmation of a statistically significant downward shift, reassessment of values shall be conducted if evaluation is either not undertaken or does not adequately address the downward shift. 1.1 This practice covers the principles and procedures for establishing allowable stress values for bending, tension parallel to grain, compression parallel to grain and modulus of elasticity values for structural design from “In-Grade” tests of full-size visually graded solid sawn dimension lumber. This practice also covers procedures for periodic monitoring, and additional procedures, if needed, for evaluation and possible reassessment of assigned design values. This practice is focused on, but is not limited to, grades which used the concepts incorporated in Practice D245 and were developed and interpreted under American Softwood Lumber PS 20. 1.2 A basic assumption of the procedures used in this practice is that the samples selected and tested are represe......
Standard Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens
Parts of wood and wood materials. Machining allowances
Round timber of coniferous species. Specifications
Building timber structures. Rules of strength grading of sawn timber
Principal joints of details of wood and wooden materials. Types and dimensions
Kayu bundar jenis jati – Bagian 3: Pengukuran dan tabel isi
Scope is not provided for this standard
Wood -- Sampling methods and general requirements for physical and mechanical testing of small clear wood specimens
Scope is not provided for this standard
Physical and mechanical properties of wood -- Test methods for small clear wood specimens -- Part 3: Determination of ultimate strength in static bending
Scope is not provided for this standard
Coniferous sawn timber -- Nominal dimensions
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