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GB 17741-2025Evaluation of seismic safety for engineering sites (English PDF)

工程场地地震安全性评价

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Issued by

State Administration for Market Regulation; Standardization Administration of China

Level / Type

National · Mandatory

Issue date

February 28, 2025

Implementation date

September 1, 2025

Scope

GB 17741-2025 is the English-translated version of 工程场地地震安全性评价.

GB 17741-2025 is the Chinese standard "Evaluation of seismic safety for engineering sites".

Its scope clause reads: This document specifies the classification and content of the work of seismic safety assessment of engineering sites, regional and near-field seismic activity and earthquake Structural evaluation, fault activity evaluation near the site, seismic engineering geological condition survey of the project site, determination of earthquake motion prediction equations, The working rules and technical indicators of potential and probabilistic earthquake hazard analysis, site ground motion parameter determination, site earthquake geological hazard evaluation, and Requirements for writing earthquake safety assessment reports.

This document is applicable to the project site selection, seismic fortification requirements, earthquake disaster risk assessment and other work involved in the project site. Earthquake safety assessment. Its clauses include terms and definitions.

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Document preview — GB 17741-2025

National Standard of the People's Republic of China

ICS: 91.120.25
Classification: P 15

Issued by: State Administration for Market Regulation; Standardization Administration of China

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Job Level and Job Content
4.1 Determination of work level
4.2 Determination of work content
4.3 Other requirements for evaluation work
5 Regional seismicity and seismotectonic assessment
5.1 Area scope and map scale
5.2 Regional seismicity
5.3 Regional earthquake structure
6 Near-field seismicity and seismotectonic evaluation
6.1 Near field range and map scale
6.2 Near-field seismicity
6.3 Near-field seismic structures
7 Evaluation of fault activity in the vicinity of the site
7.1 Site vicinity and map scale
7.2 Identification of fault activity in the vicinity of the site
7.3 Identification of active faults near the site
8 Earthquake engineering geological condition survey of the project site
8.1 Site engineering geological conditions investigation and scope
8.2 Drilling survey of site earthquake engineering geological conditions
8.3 Site rock and soil dynamic property test
8.4 Site active fault investigation
9 Determination of earthquake motion prediction equation
9.1 Earthquake Motion Prediction Equation Expression
9.2 Determination of bedrock ground motion prediction equations
10 Deterministic analysis of earthquake hazard
10.1 Establishment of earthquake source model for deterministic earthquake hazard analysis
10.2 Requirements for deterministic earthquake hazard calculations
10.3 Results of deterministic earthquake hazard analysis
11 Probabilistic analysis of earthquake risk
11.1 Probabilistic earthquake hazard analysis potential earthquake source area model
11.2 Division of earthquake statistical regions
11.3 Division of potential earthquake source areas
11.4 Determination of seismicity parameters
11.5 Calculation requirements for probabilistic earthquake hazard analysis
11.6 Results of probabilistic earthquake hazard analysis
12 Determination of site seismic parameters
12.1 Establishment of Site Seismic Response Analysis Model
12.2 Determination of input ground motion time history
12.3 Site Seismic Response Analysis
12.4 Determination of site seismic parameters
12.5 Determination of site seismic time history
13 Site Earthquake Geological Hazard Assessment
13.1 Fault slip assessment
13.2 Preliminary evaluation of earthquake liquefaction
13.3 Preliminary evaluation of soft soil subsidence
13.4 Preliminary Assessment of Earthquake Collapse and Landslides
14 Earthquake safety assessment report of the project site
14.1 Report Writing
14.2 Report Contents
Appendix B (Normative) Contents of the Seismic Safety Assessment Report for the Project Site

1 Scope

This document specifies the classification and content of the work of seismic safety assessment of engineering sites, regional and near-field seismic activity and earthquake

Structural evaluation, fault activity evaluation near the site, seismic engineering geological condition survey of the project site, determination of earthquake motion prediction equations,

The working rules and technical indicators of potential and probabilistic earthquake hazard analysis, site ground motion parameter determination, site earthquake geological hazard evaluation, and

Requirements for writing earthquake safety assessment reports.

This document is applicable to the project site selection, seismic fortification requirements, earthquake disaster risk assessment and other work involved in the project site.

Earthquake safety assessment.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to

This document.

GB 17740 Provisions on earthquake magnitude

GB/T 18207 (all parts) Terminology for earthquake disaster prevention and reduction

GB 18306 China Earthquake Motion Parameter Zoning Map

GB/T 36072 Active fault detection

GB/T 50011 Building seismic design standard

GB 50021 Geotechnical Engineering Investigation Code

GB/T 50269 Specification for testing dynamic characteristics of foundation

JGJ83 Code for geotechnical engineering investigation in soft soil areas

3 Terms and definitions

The terms and definitions defined in GB 17740, GB/T 18207 (all parts), GB 18306, GB/T 36072 and the following terms and definitions apply to this document.

3.1

The probability that the project site will encounter an earthquake intensity value or ground motion parameter value greater than or equal to a given threshold.

3.2 Fault source

In earthquake hazard analysis, the fault plane characterizes the areas where the earthquake source and rupture surface of the fault may be distributed in the future.

3.3 seismic belt

A zone where seismic activity is closely related to seismic tectonic conditions.

3.4

A physical parameter that characterizes the ground motion caused by an earthquake.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 34 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 18207 · GB/T 50011 · GB 50021

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