Structuraldesignactions
Part 4:EarthquakeactionsinAustralia
AS 1170.4:2024
This Standard was published on 21 June 2024.
The following are represented on Committee BD-006: Australasian Wind Engineering SocietyAustralian Building Codes Board Australian Steel InstituteCement Concrete & Aggregates Australia Bureau of Steel Manufacturers of AustraliaConcrete Institute of AustraliaConcrete Masonry Association of Australia Engineers AustraliaForest and Wood Products Australia Housing Industry AssociationInsurance Council of Australia James Cook UniversityProperty Council of Australia Steel Reinforcement Institute of AustraliaSwinburne University of Technology The University of MelbourneUniversity of Newcastle
This Australian Standard @ was prepared by BD-006 General Design Requirements andDevelopment and Accreditation Committee on 04 June 2024.
This Standard was issued in draft form for ment as DR AS 1170.4:2023.
Structuraldesignactions
Part4:EarthquakeactionsinAustralia
Preface
Zealand Committee BD-006 General Design Requirements and Loading on Structures to supersedeAS1170.4:2007.
After consultation with stakeholders in both countries Standards Australia and Standards New Zealand decided to develop this Standard as an Australian Standard rather than an Australian/NewZealand Standard.
The objective ofthis Standard is to provide designers of structures with earthquake actions and generalon life safety. detailing requirements for use in the design of structures subject to earthquakes with a primary focus
The Standard has been drafted to be applicable to the design of structures constructed of any materialorbinationthereof.Designerswill need toreferto theappropriatematerialStandard(s) ondetailing requirements additional to those contained in this Standard.
This Standard is based on equivalent principles to ISO 3010:2017 Basis for design of structuresof national Standards on seismic actions. The principles of ISO 3010 have been adopted including some of the detail with modifications for the low seismicity in Australia. The most significant pointsare as follows:
(a) ISO 3010 is drafted as a guide for mittees preparing Standards on seismic actions.
(b)Method and notationforpresentingthemapped earthquakehazard datahasnotbeenadopted.
The terms “normative and “informative” are used in Standards to define the application of theesps od e s xee se “informative” appendix is only for information and guidance.
of this document. Notes that appear in the main text of this document provide information only.
Contents
Preface.Section 1 Scope and general. 11.1 Scope. 11.2 1.3 Normative references. Terms and definitions. 2 11.4 1.5 Levels weights and forces of the structure. Notation and units. 6 4Section 2 Design procedure. 102.1 2.2 Design procedure. General. 10 10Section3 Site hazard. 133.1 Annual probability of exceedance (P) and probability factor (kp) Hazard design factor (Z) 133.3 3.2 The product kpZ 13 14Section4 Site sub-soil class 224.1 Determination of site sub-soil class 4.1.1 General. 22 224.1.2 4.1.3 Site classification methods. Evaluation of periods for layered sites. 22 224.2 Site class definitions. 234.2.1 4.2.2 Overview. Class Ae Strongrock. 23 234.2.3 4.2.4 Class Be Class Ce Shallow soil site Rock. 23 244.2.5 Class De Deep or soft soil site. 24Section5 Earthquake design.. 4.2.6 Class Ee- Very soft soil site. 245.1 General. 25 255.2 Basic design principles. 5.2.1 Seismic-force-resisting system 25 255.2.2 5.2.3 Performance under earthquake deformations Tying structure together. 255.2.4 Walls. 25 265.2.5 5.2.6 Diaphragms. System ductility.. 26 265.3 Earthquake design category I (EDC 1) 265.4 Earthquake design category II (EDCI1) 5.4.1 General 27 275.4.2 5.4.3 Vertical earthquake actions. Strength and stability provisions. 27 275.4.4 5.4.5 Pounding 205.4.6 Parts and ponents. 28 285.5 Earthquake design category III (EDC III) 5.5.1 General 28 285.5.2 Strength and stability provisions. Vertical earthquake actions. 285.5.3 5.5.4 Drift. 28 285.5.5 5.5.6 Parts and ponents. Pounding 29 29Section 6 Equivalent static analysis 306.1 General. 30
