BS EN 14349-2012 PDF

Full title and description

STB BS EN 14349-2012 — Timber structures — Strength graded structural glued laminated timber — Requirements and determination of characteristic values for strength and stiffness (European Standard adopted as British and national standard). This standard specifies the requirements, test methods and procedures for determining characteristic mechanical properties and stiffness of glued laminated timber (glulam) manufactured from strength-graded timber, for use in structural design and assessment.

Abstract

This standard sets out the rules and procedures to establish characteristic values of strength and stiffness for structural glued laminated timber (glulam) made from strength-graded timber. It covers sampling, preparation and testing of test specimens, statistical treatment of test results, conversion factors and tabulation of characteristic values used for design and verification of glulam members in buildings and civil engineering structures. The document supports uniform assessment of glulam products and helps ensure reliable structural performance when used in accordance with design standards.

General information

• Status: Adopted national implementation of EN 14349:2012 (published as STB BS EN 14349-2012)
• Publication date: 2012
• Publisher: British Standards Institution (BSI) / Standards body adopting EN standard nationally
• ICS / categories: 91.100.20 (Timber structures), 83.100 (Product standards and test methods for wood)
• Edition / version: 2012 (EN 14349:2012 adoption)
• Number of pages: Typically around 28–36 pages (exact page count varies by national publication format)

Scope

The standard applies to glued laminated timber (glulam) manufactured from strength-graded timber and intended for structural use. It defines test methods and statistical procedures to determine characteristic values of strength and stiffness for various failure modes (bending, tension, compression, shear, and axial), specifies sampling and specimen preparation, and gives rules for conversion of test results to characteristic values for design. It is intended to be used in conjunction with design standards for timber structures and with product standards covering glulam manufacturing and conformity.

Key topics and requirements

• Definitions and product description for glued laminated timber made from strength-graded timber.
• Sampling plans and specimen preparation for mechanical testing.
• Test methods for determination of strength (bending, tension, compression, shear) and stiffness (modulus of elasticity) of glulam.
• Statistical treatment of test data to derive characteristic values (e.g., 5th percentile or specified characteristic levels) and associated confidence limits.
• Conversion and size effect factors to relate test specimens to full-scale members and different cross-section sizes.
• Requirements for reporting test results and for use of characteristic values in structural design.
• Guidance on sampling from production batches and on combining data from different glue-lines or lamellae.

Typical use and users

Used by manufacturers of glued laminated timber, testing laboratories, structural engineers, designers, certifying bodies, and building regulators. It is applied when establishing product properties for design, performing type testing for product approval, and preparing technical documentation for conformity assessment and CE marking or national equivalents.

Related standards

Standards commonly referenced together with this document include: EN 386 (strength graded glued laminated timber — production requirements), EN 1995-1-1 (Eurocode 5: Design of timber structures — general rules and rules for buildings), EN 384 (structural timber — determination of characteristic values of mechanical properties and density), EN 408 (timber structures — structural timber and glulam — determination of some physical and mechanical properties), and relevant national annexes and product standards for glulam.

Keywords

glued laminated timber, glulam, strength grading, characteristic values, modulus of elasticity, mechanical testing, bending strength, shear strength, statistical treatment, timber structures, EN 14349, product testing

FAQ

Q: What is this standard?

A: It is the national adoption of EN 14349:2012 that specifies requirements and test procedures to determine characteristic strength and stiffness values for glued laminated timber manufactured from strength-graded lamellae.

Q: What does it cover?

A: It covers sampling, specimen preparation, laboratory test methods for strength and stiffness, statistical analysis to derive characteristic values, conversion factors and reporting rules to support structural design and product assessment.

Q: Who typically uses it?

A: Glulam manufacturers, testing laboratories, structural engineers and designers, certification bodies, and regulators involved in approval, conformity assessment and design of timber structures.

Q: Is it current or superseded?

A: The document refers to the 2012 edition of EN 14349. Users should check with the national standards body to confirm whether a later revision or replacement exists or whether any national amendments apply.

Q: Is it part of a series?

A: Yes. It is part of the family of European standards and product/test standards for structural timber and glulam, intended to be used alongside EN 386, EN 384, EN 408 and the Eurocode for timber (EN 1995 series).

Q: What are the key keywords?

A: Glulam, glued laminated timber, strength grading, characteristic values, modulus of elasticity, mechanical testing, EN 14349.