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GB 50068-2018: Unified standard for reliability design of building structures
GB 50068-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50068-2018
Unified standard for reliability design of building structures
ISSUED ON: NOVEMBER 01, 2018
IMPLEMENTED ON: APRIL 01, 2019
Issued by: Ministry of Housing and Urban-Rural Development of PRC.
State Administration of Market Regulation.
Table of Contents
Foreword ... 6
1 General provisions ... 8
2 Terms and symbols ... 8
2.1 Terms ... 8
2.2 Symbols ... 16
3 Basic requirements ... 18
3.1 Basic principles ... 18
3.2 Class of safety and reliability ... 19
3.3 Design working life and durability ... 20
3.4 Reliability management ... 21
4 Principles of limit states design ... 22
4.1 Limit states ... 22
4.2 Design situations ... 23
4.3 Limit state design ... 23
5 Actions on structures and environmental influences ... 25
5.1 General requirements ... 25
5.2 Actions on structures ... 25
5.3 Environmental influences ... 28
6 Properties of materials, geotechnics and geometrical quantities ... 28
6.1 Properties and geotechnics of materials ... 28
6.2 Geometric quantities ... 29
7 Structural analysis and design assisted by testing ... 29
7.1 General requirements ... 29
7.2 Structural modelling ... 30
7.3 Actions modelling ... 30
7.4 Method of structural analysis ... 31
7.5 Design assisted by testing ... 31
8 Method of partial factors design ... 32
8.1 General requirements ... 32
8.2 Ultimate limit states ... 33
8.3 Serviceability limit states ... 38
Appendix A Assessment of existing structures ... 40
Appendix B Structural integrity ... 47
Appendix C Design of durability limit states ... 50
Appendix D Quality management ... 56
Appendix E Basis of reliability and method of structural reliability design ... 58
Appendix F Design assisted by testing ... 65
Explanation of wording in this standard ... 69
List of quoted standards ... 70
Unified standard for reliability design of building structures
1 General provisions
1.0.1 This standard is hereby formulated, in order to unify the basic principles, basic
requirements, basic methods of the reliability design of building structures of various
materials, so that the structure meets the requirements of sustainable development, as
well as the requirements of safety, reliability, economic reasonableness, advanced
technology, quality assurance.
1.0.2 This standard is applicable to the design of the entire structure, the components
that make up the structure, and the foundation. It is applicable to the design of the
construction stage and use stage of the structure. It is applicable to the reliability
assessment of existing structures. The reliability assessment of existing structures can
be carried out, in accordance with the provisions of Appendix A of this standard.
1.0.3 This standard is formulated, based on the principles of the current national
standard "Unified standard for reliability design of engineering structures" GB 50153.
It is the basic requirement for the reliability design of building structures.
1.0.4 The design of building structures should adopt the limit state design method, based
on probability theory and expressed by partial factors. When there is a lack of statistical
data, the design of building structures can be based on reliable engineering experience
or necessary experimental research, OR it can be carried out, using the empirical
methods such as allowable stress or single safety factor.
1.0.5 When formulating load standards for building structures, structural design
standards for various materials, and other related standards, it shall comply with the
basic criteria, which are stipulated in this standard; meanwhile formulate corresponding
specific provisions.
1.0.6 In addition to complying with the provisions of this standard, the building
structure design shall also comply with the provisions of the relevant national standards,
which are currently in force.
2 Terms and symbols
2.1 Terms
2.1.1 Structure
action.
2.1.12 Load case
A set of consistent load arrangements, that simultaneously consider fixed variable
actions, permanent actions, free actions, as well as deformations and geometric
deviations, for a specific verification purpose.
2.1.13 Limit states
A certain state, beyond which the entire structure or a part of the structure cannot meet
a certain functional requirement, which is specified in the design. This specific state is
the limit state of the function.
2.1.14 Ultimate limit states
A state, which corresponds to the deformation in which a structure or structural member
reaches its maximum bearing capacity OR is unsuitable for continued bearing.
2.1.15 Serviceability limit states
A state, where a structure or structural member reaches a specified limit for normal use.
2.1.16 Irreversible serviceability limit states
Serviceability limit states, where the consequences of actions, which is generated and
exceeds the normal use requirements, after removal, cannot be restored.
2.1.17 Reversible serviceability limit states
Serviceability limit states, where the consequences of actions, which is generated and
exceeds the normal use requirements, after removal, can be restored.
2.1.18 Durability limit states
A state corresponding to the deterioration of a structure or structural member under
environmental influence, that reaches a certain specified limit or mark of durability
performance.
2.1.19 Resistance
The ability of a structure or structural member, to withstand the effects of action and
environmental influences.
2.1.20 Structural integrity: structural robustness
When accidental events such as fire, explosion, impact or human error occur, the ability
of the entire structure to remain stable, without causing damage that is disproportionate
to the cause.
2.1.21 Key member; key element
Structural members, on which the ultimate limit state performance of the structure
depends.
2.1.22 Progressive collapse
Initial local damage, propagating from member to member, eventually leads to the
collapse of the entire structure or a portion of the structure that is disproportionate to
the cause.
2.1.23 Reliability
The ability of a structure to complete a predetermined function, within a specified time
and under specified conditions.
2.1.24 Degree of reliability; reliability
The probability, that a structure will complete a predetermined function, within a
specified time and under specified conditions.
2.1.25 Probability of failure pf
The probability that a structure will fail to perform its intended function.
2.1.26 Reliability index β
A numerical index, that measures structural reliability. The reliability index β is the
inverse function of the standard normal distribution function, which has a negative
failure probability pf.
2.1.27 Basic variable
A defined set of variables representing physical quantities, which are used to
characterize actions and environmental influences, properties of materials and
geotechnical materials, as well as geometric parameters.
2.1.28 Performance function
A function of basic variables, that represents a structural function.
2.1.29 Probability distribution
The statistical rules of the values of random variables, which are generally expressed
by probability density functions or probability distribution functions.
2.1.30 Statistical parameter
The reaction of a structure or structural member, which is cau...