AS 4773.1:2015 pdf download.Masonry in small buildings Part 1: Design.
SECTION 2 DESIGN CRITERIA
2.1 SCOPE OF SECTION
This Section sets out general design criteria for masonry. Particular requirements for structural design are set out in Sections 6, 7, 8, 9 and 10. NOTE: The aim of design should be to provide a structure that is durable, fire resistant, serviceable, and has adequate strength and stability while serving its intended function and satisfying other relevant requirements, such as resistance to water penetration and robustness.
2.2 DESIGN REQUIREMENTS
2.2.1 Design for durability A masonry member or structure shall be designed for durability in accordance with Section 4.
2.2.2 Design for serviceability A masonry member or structure shall be designed for serviceability as set out in Clauses 2.3.1 and 2.3.2, in accordance with Section 6, 7, 8 or 9, as appropriate.
2.2.3 Design for strength A masonry member or structure shall be designed for strength as set out in Clauses 2.3.1 and 2.3.3, in accordance with Section 6, 7, 8, 9 or 10.
2.2.4 Design for stability A masonry member or structure shall be designed for stability as set out in Clauses 2.3.1 and 2.3.4, in accordance with Section 6, 7, 8, 9 or 10.
2.2.5 Design for fire resistance A masonry member or structure shall be designed for fire resistance in accordance with Section 5.
2.2.6 Design for prevention of water penetration A masonry member or structure shall be designed for other requirements as set out in Clause 2.3.5, and in accordance with Sections 11, 12, 13 and 14.
2.3 SERVICEABILITY, STRENGTH, STABILITY AND PREVENTION OF WATER PENETRATION
2.3.1 General
Design for serviceability, strength and stability shall—(a) provide for all loads and forces to be transferred through the structure to the foundation;(b) provide for compatibility between each masonry member and the structural members giving vertical and, where required, lateral support to that masonry member; and (c) be based on the material properties of the masonry in accordance with Section 3. NOTE: Design for serviceability, strength and stability should be in accordance with accepted principles of mechanics.
2.3.2 Design for serviceability
A masonry member or structure shall be designed to allow movements to be controlled or isolated so that damage to the masonry, the building and its components is avoided and the structural and other requirements are satisfied.
The movements to be allowed for shall include the following:
(a) The expansion characteristics of clay masonry and the shrinkage characteristics of concrete masonry and calcium silicate masonry.
(b) Thermal movements.
(c) Deflections, shortening, shrinkage, creep and similar deformations in adjacent or associated materials.
(d) Foundation movements.
(e) Deformation due to construction loads or construction sequences.
If subjected to design loads or design building movement, masonry shall experience no damage, a low incidence of damage category 1 or an occasional incidence of damage category 2. The classification of damage with reference to walls is given in Table 2.1. Masonry is deemed to meet this performance requirement if it complies with this Standard and AS 4055 for the appropriate wind class and is constructed on concrete footings and/or concrete slabs complying with AS 2870 for the appropriate site classes nominated therein.
2.3.3 Design for strength
A masonry member or structure shall be designed to prevent failure under the worst combinations of actions. The wind actions used in this Standard shall be as specified in
AS 4055.
2.3.4 Design for stability
The structure (as a whole) and its parts shall be designed to prevent instability due to overturning, uplift and sliding under the worst combination of actions. The wind actions used in this Standard are as specified in AS 4055.
2.3.5 Design for prevention of water penetration
Where moisture penetration is required to be prevented, a masonry member or structure shall be designed, constructed and protected against passage of moisture in accordance with Clause 14.8.
3.1 SCOPE OF SECTION
This Section sets out the requirements for materials of masonry units, mortar, grout, damp- proof courses, flashings, built-in components and reinforcement.
3.2 MASONRY UNITS
3.2.1 General All masonry units shall be fired clay, concrete or calcium silicate units complying with AS/NZS 4455.1. The salt attack resistance grade of masonry units shall comply with the durability requirements of Section 4.
3.2.2 Unreinforced loadbearing masonry For unreinforced loadbearing masonry, the units shall have a minimum characteristic unconfined compressive strength as follows:
(a) 5 MPa for solid or cored units. (b) 10 MPa for hollow units.
3.2.3 Unreinforced non-loadbearing masonry
For unreinforced non-loadbearing masonry, the units shall have a minimum characteristic uncon fined compressive strength as follows: (a) 3 MPa for solid or cored units. (b) 10 MPa for hollow units. (c) 2.5 MPa for horizontally cored units. AS 4773.1 pdf download.
AS 4773.1:2015 Masonry in small buildings Part 1: Design. SECTION 2 DESIGN CRITERIA
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