AS NZS 1720.4 pdf download

AS NZS 1720.4 pdf download.Timber structures
1.1  Scope
This Standard provides a method for determining the fire resistance for structural adequacy and insulation of solid sawn timber, timber in pole form, plywood, laminated veneer lumber (LVL), and glued- laminated structural timber elements as an alternative to a standard fire test specified in AS 1530.4 for Australia and New Zealand; and the NZS/BS 476 series and EN 1365 series for New Zealand only. This Standard also provides methods for protecting metal connectors from the effects of fire. NOTE 1  This Standard is not relevant to the determination of the early fire hazard properties of materials for which a method of assessment is given in AS/NZS 1530.3. NOTE 2  The advanced calculation method in Appendix B provides guidance for an additional method of determining fire resistance.
1.3  Terms and definitions
For the purposes of this Standard, the following terms and definitions apply. 1.3.1 design actions combination of actions in calculating the fire resistance for structural adequacy of structural elements determined in accordance with AS/NZS 1170.0 1.3.2 design density seasoned timber density of timber at 12 % moisture content 1.3.3 effective depth of charring calculated depth to which the timber is considered as being charred 1.3.4 effective residual section timber section remaining after removal of the calculated effective depth of charring from all fire- exposed surfaces Note 1 to entry: The effective residual section is considered to retain the same mechanical properties it possessed before exposure to the standard fire. 1.3.5 fire resistance level (FRL) or fire resistance rating (FRR) performance criteria for fire resistance, that is, the grading periods (in minutes) for the criteria specified in the National Construction Code (FRL) or the New Zealand Building Code (FRR), as — (a) structural adequacy; (b) integrity; and (c) insulation, and expressed in that order 1.3.6 fire-resistant protective insulation thermal insulation materials, including board products and wood products that are permanently fixed to the fire-exposed surfaces of a timber element or metal connector to increase the fire resistance for structural adequacy 1.3.7 may indicates the existence of an option 1.3.8 notional charring rate (for design purposes) rate at which timber is assumed to be converted to char when exposed to fire 1.3.9 should indicates a recommendation 1.3.10 shall indicates that a statement is mandatory 1.3.11 standard fire test tests are defined per region, as follows: (a) For Australia — Fire-resistance tests of elements of building construction in accordance with AS 1530.4. (b) For New Zealand — Fire-resistance tests of elements of building construction in accordance with AS 1530.4, or fire tests on building materials and structures in accordance with NZS/BS 476 (series), or fire resistance tests for loadbearing elements in accordance with EN 1365 (series). 1.3.12 structural timber element any timber component or element forming part of the loadbearing framework of a structure including, but not limited to, structures as classified in the National Construction Code for Australia or the New Zealand Building Code
1.4  Materials
1.4.1  Timber materials Solid sawn timber, timber in pole form, plywood, laminated veneer lumber (LVL), and glued-laminated structural timber elements used in accordance with this Standard shall conform with the requirements of the relevant Standards, as follows: (a) Visually graded sawn timber — AS 2082, AS 2858 or NZS 3631. (b) Solid stress graded structural timber — AS/NZS 1748.1. (c) Proof-graded timber — AS 3519. (d) Structural plywood — AS/NZS 2269.0. (e) Structural laminated veneer lumber — AS/NZS 4357.0. (f) Glued laminated timber — AS/NZS 1328.1. (g) Round timber — AS 3818.3 or AS 3818.11, as appropriate. (h) Other timber products or grades — Timber products or grades not listed in this Standard shall have properties established by testing and evaluation methods consistent with those described in the AS/NZS 4063 series. In addition, for other timber-based products, modification factors for duration of load effect for strength and stiffness shall be determined based on testing. 1.4.2  Structural adhesive Phenol, resorcinol, phenol-resorcinol or poly-phenolic structural adhesives permitted in the manufacturing standards for glue laminated timber, plywood or laminated veneer lumber (LVL), fabricated in accordance with the following Standards shall be used: (a) AS/NZS 1328.1. (b) AS/NZS 2269.0. (c) AS/NZS 4357.0.