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  • ASTM
    D7199-07(2012) Standard Practice for Establishing Characteristic Values for Reinforced Glued Laminated Timber (Glulam) Beams Using Mechanics-Based Models
    Edition: 2012
    $113.57
    Unlimited Users per year

Description of ASTM-D7199 2012

ASTM D7199 - 07(2012)

Standard Practice for Establishing Characteristic Values for Reinforced Glued Laminated Timber (Glulam) Beams Using Mechanics-Based Models

Active Standard ASTM D7199 | Developed by Subcommittee: D07.02

Book of Standards Volume: 04.10




ASTM D7199

Abstract

This practice covers mechanics-based models for calculating characteristic values for the strength and stiffness of reinforced structural glued laminated timbers (glulam). The mechanics-based analyses shall account for the following: (1) stress-strain relationships for wood laminations and reinforcement; (2) strain compatibility; (3) equilibrium; (4) variability of mechanical properties; (5) volume effects; (6) finger-joint effects; (7) laminating effects; and (8) stress concentrations at the termination of reinforcement in beams with partial length reinforcement. This practice also provides for minimum physical test requirements to validate mechanics-based models. A minimum set of performance-based durability test requirements for reinforced glulams is also herein described. Additional durability test requirements shall be considered in accordance with the specific end-use environment.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This practice covers mechanics-based requirements for calculating characteristic values for the strength and stiffness of reinforced structural glued laminated timbers (glulam) manufactured in accordance with applicable provisions of ANSI/AITC A190.1 , subjected to quasi-static loadings. It addresses methods to obtain bending properties parallel to grain, about the x-x axis (F bx and E x ) for horizontally-laminated reinforced glulam beams. Secondary properties such as bending about the y-y axis (F by ), shear parallel to grain (F vx and F vy ), tension parallel to grain (F t ), compression parallel to grain (F c ), and compression perpendicular to grain (F c ?) are beyond the scope of this practice. When determination of secondary properties is deemed necessary, testing according to other applicable methods, such as Test Methods D143 , D198 or analysis in accordance with Practice D3737 , is required to establish these secondary properties. Reinforced glulam beams subjected to axial loads are outside the scope of this standard. This practice also provides minimum test requirements to validate the mechanics-based model.

1.2 The practice also describes a minimum set of performance-based durability test requirements for reinforced glulams, as specified in Annex A1 . Additional durability test requirements shall be considered in accordance with the specific end-use environment. Appendix X1 provides an example of a mechanics-based methodology that satisfies the requirements set forth in this standard.

1.3 Characteristic strength and elastic properties obtained using this standard may be used as a basis for developing design values. However, the proper safety, serviceability and adjustment factors including duration of load, to be used in design are outside the scope of this standard.

1.4 This practice does not cover unbonded reinforcement, prestressed reinforcement, nor shear reinforcement.

1.5 The values stated in SI units are to be regarded as standard. The mechanics based model may be developed using SI or in.-lb units.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D9 Terminology Relating to Wood and Wood-Based Products

D143 Test Methods for Small Clear Specimens of Timber

D198 Test Methods of Static Tests of Lumber in Structural Sizes

D905 Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading

D1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens

D2559 Specification for Adhesives for Bonded Structural Wood Products for Use Under Exterior Exposure Conditions

D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products

D3039/D3039M Test Method for Tensile Properties of Polymer Matrix Composite Materials

D3410/D3410M Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading

D3737 Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)

D4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material

D5124 Practice for Testing and Use of a Random Number Generator in Lumber and Wood Products Simulation

Other Standard

ANSI/AITCA190.1 Structural Glued Laminated Timber Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.

Keywords


ICS Code

ICS Number Code 79.060.99 (Other wood-based panels)


DOI: 10.1520/D7199-07R12

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ASTM D7199

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