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GB 55002-2021: Code for seismic design of buildings
GB 55002-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 55002-2021
General code for seismic precaution of buildings and
municipal engineering
ISSUED ON: APRIL 09, 2021
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
Table of Contents
Foreword ... 3 
1 General ... 6 
2 Basic provisions ... 6 
2.1 Performance requirements ... 6 
2.2 Earthquake effects ... 7 
2.3 Seismic fortification classification and fortification criteria ... 8 
2.4 Engineering seismic system ... 10 
3 Seismic requirements of site and foundation ... 11 
3.1 Site seismic survey... 11 
3.2 Earthquake resistance of base and foundation ... 13 
4 Seismic action and structural seismic verification ... 14 
4.1 General provisions ... 14 
4.2 Seismic action ... 15 
4.3 Seismic check ... 18 
5 Seismic measures for construction projects ... 21 
5.1 General provisions ... 21 
5.2 Concrete structure houses ... 25 
5.3 Steel structure house ... 27 
5.4 Steel-concrete composite structure house ... 28 
5.5 Masonry structure houses ... 30 
5.6 Wooden houses ... 35 
5.7 Earth and stone structure houses ... 36 
5.8 Mixed load-bearing structures ... 38 
6 Anti-seismic measures for municipal engineering ... 40 
6.1 Urban bridge ... 40 
6.2 Urban rural water supply and drainage and gas thermal engineering ... 43 
6.3 Underground engineering structure ... 47 
General code for seismic precaution of buildings and
municipal engineering
1 General
1.0.1 This Code is formulated, in order to implement the national laws and
regulations on earthquake prevention and disaster reduction of buildings and
municipal projects, implement the principle of prevention first, so that buildings
and municipal projects can achieve the target of reducing earthquake damage,
avoiding casualties, reducing economic losses after seismic fortification.
1.0.2 All kinds of newly-built, expanded, reconstructed buildings and municipal
projects, in areas which have a seismic fortification intensity of 6 degrees and
above, must be seismically fortified. The survey, design, construction, use
maintenance of engineering projects must comply with this Code.
1.0.3 Whether the technical methods and measures, which are adopted in the
construction of the project, meet the requirements of this Code, shall be
determined by the relevant responsible entities. Among them, innovative
technical methods and measures shall be demonstrated to meet the
performance requirements in this Code.
2 Basic provisions
2.1 Performance requirements
2.1.1 For all kinds of buildings and municipal projects with seismic fortification,
their seismic fortification objectives shall meet the following requirements:
1 In the event of frequent earthquakes, which are lower than the fortification
intensity of the region, the main structures and municipal pipe network
systems of various projects can continue to be used, without damage or
repairs.
2 When encountering fortification earthquakes, which are equivalent to the
fortification intensity of the region, buildings, structures, bridge structures,
underground engineering structures, etc. in various projects may be
damaged, BUT they can continue to be used, after general repairs. The
damage to the municipal pipe network shall be controlled within the local
scope AND shall not cause secondary disasters.
D.
2.3.2 The seismic fortification criteria of buildings and municipal works, which
have each type of seismic fortification, shall meet the following requirements:
1 For the standard fortification category, the anti-seismic measures and
seismic action shall be determined, according to the seismic fortification
intensity of the local area, so as to achieve the seismic fortification target
that it will not collapse or cause serious damage, that endangers life and
safety, in the event of a rare earthquake that is higher than the local seismic
fortification intensity.
2 For the key fortification category, the anti-seismic measures shall be
strengthened, according to the requirement that the seismic fortification
intensity of the region shall be increased by one degree. However, when
the seismic fortification intensity is 9 degrees, anti-seismic measures shall
be taken according to the requirements higher than 9 degrees. The anti-
seismic measures for the foundation shall comply with the relevant
provisions. At the same time, the seismic action shall be determined,
according to the seismic fortification intensity of the area.
3 For the special fortification category, the seismic measures shall be
strengthened, according to the requirement of increasing the seismic
fortification intensity of the region by one degree. However, when the
seismic fortification intensity is 9 degrees, the seismic measures shall be
taken according to the requirements higher than 9 degrees. At the same
time, the seismic action shall be determined, according to the results of the
approved seismic safety evaluation AND higher than the requirements of
the seismic fortification intensity of the area.
4 For the moderate fortification category, it is allowed to reduce the seismic
measures appropriately, as compared with the requirements of the seismic
fortification intensity in this area. However, the seismic fortification intensity
shall not be reduced, when the seismic fortification intensity is 6 degrees.
Under normal circumstances, the seismic action shall still be determined,
according to the seismic fortification intensity of the area.
5 When the project site is category I, for the projects of special fortification
category and key fortification category, seismic structural measures are
allowed to be taken, according to the requirements of the fortification
intensity of the region. For the projects standard fortification category, the
seismic structure measures are allowed to be reduced by one degree;
however, it shall not be lower than the requirement of 6 degrees.
6 For urban bridges, the frequent earthquake action shall be adjusted,
according to the different seismic fortification categories multiplied by the
corresponding importance coefficient. For urban bridges with special
fortification category, key fortification category, standard fortification
category, moderate fortification category, THEN, their importance
coefficients shall not be lower than 2.0, 1.7, 1.3, 1.0, respectively.
2.4 Engineering seismic system
2.4.1 The seismic system of buildings and municipal works shall be determined,
by comprehensive comparison of technology, economy, use conditions,
according to the engineering seismic fortification category, seismic fortification
intensity, engineering space scale, site conditions, foundation conditions,
structural materials, construction and other factors. Meanwhile, it shall meet the
following requirements:
1 It shall have a clear and reasonable transmission path of seismic action.
2 It shall have the necessary stiffness, strength, energy dissipation capacity.
3 It shall have the ability to avoid the loss of seismic capacity of the whole
structure OR the bearing capacity of gravity load, due to the failure of part
of the structure or components.
4 Structural members shall have sufficient ductility, to avoid embrittlement
failure.
5 The bridge structure shall also have reliable displacement restraint
...