GB 55002-2021 PDF English
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GB 55002-2021: Code for seismic design of buildings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB55002-2021
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 & drainage and gas thermal engineering... 43
6.3 Underground engineering structure... 47
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.
2.1.2 For buildings and municipal works with seismic fortifications, the
exceedance probability level of frequent ground motions, fortified ground
motions, rare ground motions shall not be lower than those specified in Table 2.1.2.
2.2 Earthquake effects
2.2.1 The seismic fortification intensity, of various buildings and municipal works,
shall not be lower than the local seismic fortification intensity.
2.2.2 The earthquake impact, which is suffered by each region, shall be
characterized by the design basic seismic acceleration and characteristic
period, which is corresponding to the seismic fortification intensity; meanwhile
it shall meet the following requirements.
2.4.3 The seismic system of urban water supply & drainage and gas-fired
thermal engineering shall meet the following requirements.
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
3.2 Earthquake resistance of base and foundation
3.2.1 The seismic check calculation of natural foundation shall be carried out,
by adopting the standard combination of earthquake action effect and
foundation seismic bearing capacity. The seismic bearing capacity of the
foundation shall be the product of the characteristic value of the foundation
bearing capacity multiplied by the adjustment coefficient of the foundation
seismic bearing capacity. The adjustment coefficient of the seismic bearing
capacity of the foundation shall be selected, according to the properties of the
foundation soil, BUT it shall not exceed 1.5.
3.2.2 For buildings and municipal projects whose seismic fortification intensity
is not less than 7 degrees, when there is saturated sand and saturated silt,
within 20 m below the ground, it shall perform liquefaction judgement. For the
foundation, where there is liquefaction soil layer, it shall take corresponding
anti-liquefaction measures, based on the seismic fortification category and the
liquefaction grade of the foundation, in combination with the specific
circumstances.
3.2.3 The reinforcement range of piles, in liquefied soil and seismically subsided
soft soil, shall be the FROM the top of the pile TO the depth of not less than 1.0
m below the bottom of the liquefied soil layer or the bottom of the seismically
subsided soft soil layer. The longitudinal reinforcement shall be in line with the
top of the pile. The stirrups shall be reinforced.
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.
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.
4.2 Seismic action
4.2.1 The determination of horizontal seismic action of buildings and municipal
works shall meet the following requirements.
4.2.2 For the value of the horizontal earthquake influence coefficient of various
buildings and municipal works, it shall meet the following requirements.
4.2.3 Under frequent earthquakes, the standard value of horizontal seismic
shear force, of various buildings and municipal engineering structures, shall
meet the following requirements.
4.3 Seismic check
4.3.1 The seismic bearing capacity of the section of the structural members
shall meet the requirements of the following formula.
4.3.3 The deformation check calculation of various structures, under seismic
action, shall meet the following requirements.
5 Seismic measures for construction projects
5.1 General provisions
5.1.1 The architectural design shall clarify the regularity of the architectural form,
according to the requirements of the seismic conceptual design. For irregular
buildings, it shall take strengthening measures, according to requirements. For
special irregular buildings, it shall be specially studied and demonstrated AND
take special strengthening measures. It shall not adopt serious irregular
building plans.
5.1.2 For houses with concrete structure, steel structure, steel-concrete
composite structure, wood structure, the appropriate structural system shall be
selected, according to the comprehensive analysis and selection of factors,
such as fortification category, fortification intensity, building height, site
foundation conditions, use requirements, building shape. In concrete structure
houses and steel-concrete composite structure houses, the concrete strength
grade of frame-supported beams, frame pillars as well as the frame beams,
columns and joint core areas, whose seismic grade is not lower than grade 2,
shall not be lower than C30.
5.1.8 The structure, below the seismic isolation layer, shall be able to ensure
the safe operation of the seismic isolation layer, under rare earthquakes;
meanwhile it shall meet the following requirements.
5.1.9 The connection, between the isolation bearing and the upper and lower
structures, shall be able to transmit the maximum reaction force of the isolation
bearing, under rare earthquakes.
5.1.13 In the main structure of the building, at the installation locations of non-
structural components, such as curtain walls, enclosure walls, partition walls,
parapets, awnings, trademarks, billboards, ceiling brackets, large storage racks,
etc., it shall take reinforcing measures, to withstand the seismic action, which
is transmitted by non-structural members.
5.1.14 The design and construction of non-load-bearing walls, such as
enclosure walls, partition walls, parapet walls, shall meet the following
requirements.
5.1.15 The design and construction of architectural decorative components
shall meet the following requirements.
5.2 Concrete structure houses
5.2.1 The reinforced concrete structure house shall adopt different seismic
grades, according to the fortification category, fortification intensity, structure
type, house height. Meanwhile, it shall meet the corresponding requirements
for internal force adjustment and seismic structure. The seismic grade shall
meet the following requirements.
5.2.2 The potential plastic hinge area of frame beams and frame columns shall
be reinforced with stirrups. For the wall piers, coupling beams, frame beams,
frame columns, frame-supported frames of seismic wall structures, partially
frame-supported seismic wall structures, frame-seismic wall structures, at the
potential plastic hinge areas and local stress concentration areas, it shall take
reinforcing measures.
5.3 Steel structure house
5.3.1 The steel structure house shall adopt different seismic grades, according
to the fortification category, fortification intensity, building height. It shall meet
the corresponding requirements for internal force adjustment and seismic
structure. The determination of the seismic grade shall meet the following
requirements.
5.3.2 For frame structures and unsupported frames in frame-central support
structure and frame-eccentric support structure, the upper and lower flanges of
the potential plastic hinge area, on the frame beams, shall be provided with
lateral supports OR take other effective measures, to prevent out-of-plane
instability and damage.
5.4 Steel-concrete composite structure house
5.4.1 The steel-concrete composite structure house shall adopt different
seismic grades, according to the fortification category, fortification intensity,
structure type, house height, based on the following provisions. Meanwhile, it
shall meet the corresponding requirements for internal force adjustment and
seismic structure.
5.5 Masonry structure houses
5.5.1 The number of floors and height of multi-floored masonry buildings shall
meet the following requirements.
5.5.2 The spacing of seismic transverse walls of masonry structures shall meet
the following requirements.
5.5.5 In the seismic design of the house of reinforced small block masonry
seismic wall structure, the seismic grade of the seismic wall shall be adopted,
according to Table 5.5.5, based on the fortification intensity and the height of
the house. When the height of the house is close to or equal to the height
boundary in Table 5.5.5, the seismic grade shall be determined, according to
the irregularity of the house AND the conditions of the site and foundation.
5.5.6 The design value of seismic shear strength of various types of masonry,
which is damaged along the stepped section, shall be a reasonable value.
6 Anti-seismic measures for municipal engineering
6.1 Urban bridge
6.1.1 The seismic design category of urban bridges shall be selected, according
to the seismic fortification intensity AND the seismic fortification category to
which it belongs, as shown in Table 6.1.1.
6.1.2 According to the classification in Article 6.1.1 of this Code, the seismic
design of urban bridges shall meet the following requirements.
6.1.8 The use of seismic measures for urban bridges shall not lead to major
changes in the seismic response of the main components; otherwise, the
mutual influence, between the seismic measures and the main components,
6.2 Urban rural water supply & drainage and gas thermal
engineering
6.2.1 Urban rural water supply & drainage and gas-fired thermal engineering
shall meet the following requirements.
6.2.2 The width of seismic joints of water-containing structures shall not be less
than 30 mm. When the maximum deformation value of the structures, on both
sides of the joints, exceeds 10 mm, under frequent earthquakes, they shall be
appropriately widened. At the same time, it shall clarify the corresponding
technical requirements of the water-stop. For double-wall pools that are built
next to each other AND work independently, the width of the seismic joints shall
not be less than twice the maximum displacement of the single-sided water
retaining wall, in case of frequent earthquakes, meanwhile it shall not be less
than 50 mm.
6.2.3 The seismic grade of single-floored cast-in-place concrete structures, in
urban rural water supply & drainage and gas-fired thermal engineering, shall
not be lower than those specified in Table 6.2.3.
6.2.4 The seismic check calculation of various structures in urban rural water
supply & drainage and gas-fired thermal engineering shall meet the following
requirements.
6.2.5 Gas storage tanks, in gas engineering, shall meet the following
requirements.
6.2.6 In urban rural water supply & drainage and gas-fired thermal engineering,
the materials for pipes and their connections shall still meet the following
requirements.
6.2.7 Rectangular pipes of mixed brick masonry structures shall meet the
following requirements.
6.2.8 In urban water supply & drainage and gas-fired thermal engineering, for
directly buried socket-type circular pipes and rectangular pipes, flexible
connection joints or deformation joints shall be provided, at the following
positions.
6.3 Underground engineering structure
6.3.1 The general layout of underground works shall be simple, symmetrical,
regular, smooth. The structural system shall be determined, according to the
use requirements, site engineering geological conditions, construction methods,
etc. It shall have good integrity, to avoid sudden changes in lateral stiffness and
bearing capacity of the lateral force-resistant structure. For the slopes on both
sides of the entrance and exit passages AND the upwards slope of the entrance,
it shall select a reasonable type of opening structure, according to the terrain
and geological conditions, to improve its seismic stability.
6.3.3 Earthquake response analysis shall be carried out, for underground works,
except for the following situations.
6.3.4 The seismic response analysis model of the underground work shall be
able to reflect the actual stress conditions of the surrounding earth retaining
structures and internal components. For long-line underground work, which has
uniform and regular distribution of surrounding strata and with a symmetrical
axis, it is allowed to use the plane strain analysis model; in other cases, it shall
use the spatial structure analysis model.
6.3.5 When the seismic response analysis of underground work is carried out,
each design parameter shall meet the following requirements.
6.3.10 For underground works located in rocks, it shall take the following anti-
seismic measures.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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