ISO 16711:2021 Requirements for seismic assessment and retrofit of concrete structures

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INTERNATIONAL STANDARD ISO 16711:2021

Requirements for seismic assessment and retrofit of concrete structures

1 Scope

This document provides requirements for seismic assessment and retrofit of concrete structures.

It can be used to reduce the risk of seismic damage by structural collapse or turnover during a seismic event.

This document provides the framework and principles of methods of detailed seismic assessment and the judgment, seismic retrofit plan and design, seismic retrofit execution of existing reinforced concrete structures before the occurrence of a severe earthquake and of the structures struck by an earthquake.

It is an umbrella-type document with general provisions intended to provide wide latitude of choice in terms of comprehensive principle on the evaluation of the seismic damage/expected damage of existing reinforced concrete structures and repair/retrofit. Therefore, it is intended to be used in conjunction with sound engineering judgment.

This document is applicable to reinforced concrete structures and pre-stressed concrete structures that have been designed on the basis of the structural design criteria set in a specific country or region.

It is not applicable to unreinforced concrete and masonry structures.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 1920-4:2020, Testing of concrete — Part 4: Strength of hardened concrete

ISO 15630-1:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing bars, rods and wire

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

3.1

assessment

set of activities performed in order to verify the reliability of an existing structure for future use

[SOURCE: ISO 13822:2010, 3.1]

3.2

design document

document resulting from structural calculation and design drawings

ISO 16711:2021

3.3

inspection

conformity evaluation by observation and judgment accompanied as appropriate by measurement, testing or gauging.

Note 1 to entry: For structures, this evaluation consists of actions collecting information on the current state of a structure through observation and simplified non-destructive or destructive testing supplemented with materials and structural testing, as required.

[SOURCE: ISO 16311-2:2014, 3.15]

3.4

investigation

collection of information through inspection (3.3), document search, load testing and other testing

[SOURCE: ISO 16311-1:2014, 3.7]

3.5

limit state

critical state specified using a performance index, beyond which the structure no longer satisfies a design performance requirement

[SOURCE: ISO 19338:2014, 3.9]

3.6

maintenance

set of activities taken to check, evaluate the performance of a structure, and preserve/restore it so as to satisfy performance requirements in service

[SOURCE: ISO 16311-1:2014, 3.8]

3.7

seismic capacity

force or displacement defined for the limit states (3.5)

Note 1 to entry: Multiple limit states can be selected besides the life safety limit state, such as acceptable economic loss limit state, reparability limit state, immediate occupancy limit state or functionality limit state.

3.8

performance objective

required performance level (e.g. life safety) for a given earthquake hazard level (e.g. an earthquake with a 10 % probability of exceedance in 50 years)

3.9

seismic damage

physical evidence of inelastic deformation, cracks or spalling of a structural component caused by an earthquake

3.10

seismic retrofit

restoring or improving the seismic performance of a pre- or post-earthquake existing structure to meet the seismic performance objective (3.8), including “structural repair” and “strengthening”

Note 1 to entry: Repair is adopted to restore structural performance and to mitigate safety risks up to the initially required design level and to achieve the intended service life.

Note 2 to entry: Strengthening relates to the measures taken to improve structural performance relating to load bearing capacity and deformation of an existing structure and/or its members.

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