GB 55002-2021 English PDF

GB 55002-2021: Code for seismic design of buildings
Delivery: 9 seconds. Download (& Email) true-PDF + Invoice.
Get Quotation: Click GB 55002-2021 (Self-service in 1-minute)
Historical versions (Master-website): GB 55002-2021
Preview True-PDF (Reload/Scroll-down if blank)

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
measures, to prevent falling beam damage during earthquakes.
2.4.2 The seismic system of construction projects shall meet the following
requirements:
1 The structural system shall have sufficient firmness and seismic redundancy.
2 The floor and roof shall have sufficient in-plane stiffness and integrity. When
using prefabricated floors and roofs, measures shall be taken, to ensure
the integrity of the floors and roofs AND their connection with vertical lateral
force-resistant members.
3 The foundation shall have good integrity and anti-rotation ability, so as to
avoid the foundation rotation aggravating the earthquake damage of the
building, during the earthquake.
4 The design and construction of member connections shall ensure that, the
failure of joints or anchors does not precede the failure of members or
connectors.
2.4.3 The seismic system of urban water supply and drainage and gas-fired
thermal engineering shall meet the following requirements:
1 The same structural unit shall have good integrity.
2 The buried pipeline shall adopt the pipe material with good ductility OR set
up flexible connection measures along the line.
3 The connection structure of the fabricated structure shall ensure the
integrity of the structure AND the requirements for seismic performance.
4 When the pipeline is connected to the structure or the fixed equipment, the
flexible connection structure shall be adopted.
2.4.4 Structural joints, such as expansion joints, settlement joints, anti-vibration
joints, between adjacent buildings (structures) OR between different structural
units of the same building, shall take effective measures, to avoid damage
caused by collision or extrusion under earthquakes.
2.4.5 The special requirements of the seismic structural system, for structural
materials (including special structural equipment) and construction technology,
shall be indicated on the design documents.
3 Seismic requirements of site and foundation
3.1 Site seismic survey
3.1.1 The site seismic survey of buildings and municipal works shall meet the
following requirements:
1 According to the geological environment and other conditions of the area,
where the project site is located, the seismic performance of the area shall
be evaluated as favorable, general, unfavorable or dangerous.
2 The category of the project site shall be evaluated and divided.
3 The seismic stability performance of the engineering site, such as
liquefaction, seismic subsidence, lateral expansion, collapse and landslide,
shall be evaluated; it shall give corresponding engineering prevention
measures.
4 For unfavorable segments, such as strip-shaped protruding mountain
openings, tall and isolated hills, steep slopes of non-rock and strongly
weathered rocks, river banks and slope edges, it shall also provide the
survey results of the parameters, such as the relative height difference,
4 Seismic action and structural seismic verification
4.1 General provisions
4.1.1 When calculating the seismic action of various buildings and municipal
projects, the design ground motion parameters shall be determined, according
to the relevant provisions of Article 2.2 of this Code, based on the fortification
intensity. It shall be adjusted according to the following provisions:
1 When the engineering structure is within 10 km, on both sides of the seismic
fault, the influence of the near-field effect on the design ground motion
parameters shall be taken into account.
2 When the engineering structure is located in unfavorable areas, such as
strip-shaped protruding mountain openings, towering and isolated hills,
steep slopes of non-rock and strongly weathered rocks, river banks, slope
edges, THEN, it shall consider the amplification effect of the unfavorable
areas on the horizontal design seismic parameters. The magnification
factor shall be determined, according to the specific conditions of the
unfavorable area; its value shall not be less than 1.1 and not more than 1.6.
4.1.2 The seismic action of various types of buildings and municipal works shall
be calculated, using an analysis model, that conforms to the actual working
conditions of the structure; it shall meet the following requirements:
1 In general, the horizontal seismic action shall be calculated separately,
along at least the two main axes of the structure. Where there are oblique
lateral force-resistant members, which have an intersection angle with the
main axis greater than 15°, THEN, the horizontal seismic action in the
direction of the oblique members shall also be calculated.
2 When calculating the horizontal seismic action effect of each lateral force-
resisting member, the influence of the torsional effect shall be taken into
account.
3 For the large-span and long-cantilever structures, which have seismic
fortification intensity not less than 8 degrees, AND the high-rise buildings,
which have seismic fortification intensity of 9 degrees, water-containing
structures, gas storage tanks, gas storage tanks, etc., it shall calculate the
vertical seismic action.
4 For spatial structures and long-line structures, which have large plane
projection scales, it shall consider the spatial and temporal changes of
seismic ground motion, in the calculation of seismic action.
absorbing structure, shall not be lower than the total horizontal seismic
action of the non-energy-dissipating structure, which has a fortification of 6
degrees; the horizontal seismic shear of each floor shall also meet the
requirements of Article 4.2.3 of this Code.
2 The cross-section seismic check of the main structural members shall
comply with the provisions of Article 4.3.1 of this Code. Among them, for
the beams, columns, other structural members which are connected with
the energy dissipation components, they shall be checked for the ultimate
bearing capacity, by using the combination of standard effects, under rare
earthquakes.
3 The energy-dissipating and shock-absorbing structures shall be checked
for inter-floor deformation, under frequent earthquakes and rare
earthquakes.
4 For the energy dissipation and shock absorption structure, its seismic
measures shall be determined, according to the reduction range of the
seismic action, after shock absorption.
5.1.12 For the non-structural components and ancillary electromechanical
equipment of the building, as well as their connection with the main structure,
they shall be seismically fortified.
5.1.13 In the main structure of the building, at the installation locations...