Standards Australia · Published 2021

AS 5216:2021

Design of Post-Installed and Cast-In Fastenings in Concrete

AS 5216:2021 specifies the design provisions for post-installed and cast-in fastenings in concrete, covering anchor types (mechanical expansion, undercut, screw, chemical/adhesive, cast-in headed), load conditions (tension, shear, combined, fatigue, seismic), failure modes (steel rupture, concrete cone, splitting, pull-out, pry-out, edge breakout), and design methodology under partial-factor limit-state framework. The standard is harmonised with European EOTA / EAD anchor-qualification framework and ETA (European Technical Assessment) product approvals, which are accepted for products supplied into the Australian market. AS 5216 covers structural fastenings (where the anchor is a load-bearing element of a primary structural system) and non-structural fastenings (where the anchor supports services, equipment, or non-load-bearing elements but the consequence of failure is significant). The standard prescribes design loads under AS 1170 series, characteristic anchor capacities determined from the ETA or qualified-product testing, and partial-safety-factor combinations for both ULS and SLS. AS 5216 is referenced from AS 3600 (concrete structures) and is the controlling reference for the design of post-installed anchors in concrete. The 2021 edition replaced AS 5216:2018 and incorporates updated harmonisation with ETAG/EAD methodology and explicit treatment of fire-rated and seismic-rated fastening applications.

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TRSC Engineering Interpretation

AS 5216 is decision-controlling on virtually every TRSC remediation specification involving post-installed anchors — facade-bracket retrofit, structural strengthening (CFRP plate-end anchorage, post-tensioning anchorage), helical-tie installation in masonry-to-concrete connections, balustrade and balcony retrofit, and rooftop equipment fixings. Three application points matter for existing-asset practice. First, the standard's anchor capacity is determined from the manufacturer's ETA (European Technical Assessment) or qualified-product testing, not from generic capacity equations. For each post-installed anchor specification, TRSC's remediation file retains the relevant ETA, the qualified-installation-method documentation, and the AS 5216 design calculation that applies the ETA characteristic capacity to the project-specific load conditions, edge distances, and substrate concrete strength. The Hilti HIT-RE 500 V4 epoxy-anchor system, for example, has an ETA covering specified anchor diameters, embedment depths, and substrate-strength ranges, and TRSC's remediation specifications cite the relevant ETA edition explicitly with the AS 5216 design calculation as the supporting evidence. Second, AS 5216 capacity is sensitive to substrate concrete strength, edge distance, and group spacing, and existing-asset application frequently encounters substrate conditions outside the ETA-tested envelope. Pre-1990 concrete with measured compressive strength below the ETA-tested minimum (typically 20 MPa for general structural anchors) may not support the ETA-tested capacity, and the AS 5216 calculation must apply explicit reduction factors or extrapolation methodology to the as-installed substrate. Edge distances on facade-bracket retrofits frequently fall below the ETA minimum, requiring the AS 5216 reduced-edge-capacity calculation. TRSC's remediation specifications include explicit substrate-condition assessment (typically via Schmidt Hammer rebound testing per AS 1012.20.1 supplemented by extracted-core compressive strength) before the AS 5216 calculation is finalised, and the engineering basis is documented in the Form 15 file. Third, AS 5216 requires physical proof-testing of representative anchors on site as part of the installation acceptance — typically 3 to 5 percent of installed anchors loaded to 1.25 to 2.0 times the design action with calibrated load-cell measurement. For TRSC remediation projects involving high-consequence anchor installations (BMU rail fixings, structural CFRP anchorage, post-installed cast-in-place reinforcement), the proof-testing protocol is documented in the remediation specification and witnessed by the certifying engineer. The Q1 Tower BMU rail post-Cyclone Albert remediation included AS 5216 proof-testing of every retrofit anchor to 1.5 times the design action under the AS 1170.2:2021 Region B1 wind loading, with the resulting test certificates retained in the Form 15 file. The Marina Mirage marine-deck and Helifix CemTie heritage installations have used the same protocol with substrate-specific proof-load values.

Form 15 RPEQ Certification Implications

TRSC Form 15 RPEQ certifications for remediation completion involving post-installed or cast-in fastenings reference AS 5216:2021 as the design basis for the fastening system. The Form 15 declaration is conditional on the as-installed fastenings meeting the AS 5216 design action under AS 1170.0 combinations, with the characteristic capacity determined from the relevant ETA or qualified-product testing. The Form 15 file retains the ETA documentation, the AS 5216 design calculation, the substrate-condition assessment used to verify the capacity assumption, the installer's qualification documentation per AS/NZS 5216 Appendix B (typically EOTA-equivalent installer certification for chemical anchors), and the proof-testing certificates for the witnessed test anchors. For high-consequence applications (BMU rails, structural strengthening, balcony balustrades), the Form 15 cannot be issued without witnessed proof-testing.

Frequently Asked Questions

Engineering questions about AS 5216:2021

What is an ETA and why does it matter for AS 5216 design?

An ETA (European Technical Assessment) is a product-specific qualification document issued under the EOTA framework that certifies the characteristic capacity of a specific anchor product under specified installation conditions. AS 5216 design uses the ETA characteristic capacity as the input to the partial-factor capacity calculation rather than a generic capacity equation. Each anchor product has its own ETA, with capacity values that depend on anchor diameter, embedment depth, substrate concrete strength, edge distance and group spacing. TRSC's remediation specifications cite the relevant ETA edition explicitly, and the AS 5216 design calculation applies the ETA characteristic capacity to the project-specific load conditions. The ETA documentation is retained in the Form 15 file as evidence supporting the certification.

How is anchor capacity assessed in low-strength existing concrete?

Pre-1990 concrete with measured compressive strength below the ETA-tested minimum (typically 20 MPa for general structural anchors) may not support the ETA-tested capacity. AS 5216 requires explicit substrate-condition assessment before capacity is assumed — TRSC's remediation specifications include Schmidt Hammer rebound testing per AS 1012.20.1 supplemented by extracted-core compressive strength testing per AS 1012.14 to establish the as-installed substrate strength. Where the substrate strength falls below the ETA-tested minimum, the AS 5216 calculation applies explicit reduction factors or extrapolation methodology, with the engineering basis documented in the Form 15 file. For severely deteriorated substrates, the remediation may require concrete repair (Sikadur 32-N bonding agent with replacement concrete) before anchor installation can proceed.

When is anchor proof-testing required?

AS 5216 requires physical proof-testing of representative anchors on site as part of the installation acceptance — typically 3 to 5 percent of installed anchors loaded to 1.25 to 2.0 times the design action with calibrated load-cell measurement. For TRSC remediation projects involving high-consequence anchor installations (BMU rail fixings, structural CFRP anchorage, post-installed cast-in-place reinforcement, balcony balustrades), the proof-testing protocol is documented in the remediation specification and witnessed by the certifying engineer. The Q1 Tower BMU rail post-Cyclone Albert remediation included AS 5216 proof-testing of every retrofit anchor to 1.5 times the design action, with the resulting test certificates retained in the Form 15 file. For lower-consequence applications, proof-testing is performed on a sample basis with explicit acceptance criteria documented in the specification.

How does AS 5216 interact with AEFAC TN05?

AS 5216 is the controlling design standard for post-installed and cast-in fastenings; AEFAC TN05 (Design considerations for safety critical anchors) is an Australian Engineered Fasteners and Anchors Council technical note that provides supplementary engineering guidance for the design of safety-critical anchors. TN05 is not a standard but is widely cited in Australian anchor design practice and provides treatment of edge effects, group effects, redundancy considerations, and inspection-and-testing protocols beyond AS 5216 prescribed methodology. TRSC's high-consequence anchor specifications cite both AS 5216 (as the controlling standard) and AEFAC TN05 (as the engineering-guidance reference), with the design calculation reflecting the more rigorous of the two where they overlap.

Relevant Services

Remediation Design

Structural Investigation

Relevant Materials

Sources & Further Reading

GovernmentAS 5216:2021 — Standards Australia