GB 55007-2021 PDF English
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| GB 55007-2021 | English | 710 |
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GB 55007-2021: Code for design of masonry structures---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/GB55007-2021
UDC
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 55007-2021
General Code for Masonry Structures
Issued on. APRIL 09, 2021
Implemented on. JANUARY 01, 2022
Issued by. Ministry of Housing and Urban-Rural Development of the People’s
Republic of China;
State Administration for Market Regulation.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
General Code for Masonry Structures
Drafted by. Ministry of Housing and Urban-Rural Development of the People’s Republic of
China
Approved by. Ministry of Housing and Urban-Rural Development of the People’s Republic of
China
Implemented on January 01, 2022
China Building Industry Press
2021 Beijing
No.65 [2021] Announcement of the Ministry of Housing and
Urban-Rural Development of the People’s Republic of China
Table of Contents
1 General Rules... 8
2 Basic Provisions... 8
3 Materials... 10
3.1 General rules... 10
3.2 Bulk materials... 10
3.3 Mortar and perforated concrete... 12
3.4 Strength of masonry... 13
4 Design... 14
4.1 General... 14
4.2 Multi-story and single-story masonry structures... 15
4.3 Bottom frame-seismic wall masonry structure... 16
4.4 Reinforced block masonry seismic wall structure... 18
4.5 Infill walls... 19
5 Construction and Acceptance... 19
5.1 Construction... 19
5.2 Test of masonry structures... 20
5.3 Acceptance... 21
6 Maintenance and Dismantling... 22
1 General Rules
1.0.1 In order to ensure the quality and safety of masonry structure engineering, implement the
policies of energy saving, land saving and promotion of new masonry materials, protect the
ecological environment, ensure the safety of life, property and personal health of the people,
and improve the sustainable development level of masonry structure engineering, this Code is
formulated.
1.0.2 Masonry structure engineering must implement this Code.
1.0.3 Whether the technical methods and measures adopted in the project construction meet the
requirements of this Code shall be judged by the relevant responsible parties. Among them,
innovative technical methods and measures shall be demonstrated and meet the performance
requirements in this Code.
2 Basic Provisions
2.0.1 Masonry strength shall be tested according to the masonry standard test method; and the
construction quality control level of the test shall be clarified; and the average value, variation
coefficient and standard value of masonry strength shall be determined by mathematical
statistical analysis methods.
2.0.2 The standard value of masonry strength shall be determined according to the 0.05
percentile value of its probability distribution.
2.0.3 The variation coefficient of masonry strength shall be adopted according to Table 2.0.3.
For the variation coefficient of new masonry materials, when the calculated value is less than
the value listed in Table 2.0.3, the value in the table shall be taken; when the calculated value
is greater than the value listed in Table 2.0.3, the actual calculated value shall be taken.
2.0.4 The design value of masonry strength shall be calculated and determined by dividing the
standard value of masonry strength by the partial coefficient of material properties of masonry
structures; and the partial factor for property of material of masonry structures shall be
determined according to the construction quality control level. When the construction quality
control level is Level-A, Level-B, and Level-C-, the partial factory for property of material
shall take 1.5, 1.6 and 1.8, respectively.
3 Materials
3.1 General rules
3.2 Bulk materials
3.2.1 In the masonry structure, blocks made of waste bricks and tiles, concrete blocks, muck
and other wastes as the main materials shall be promoted and applied.
3.2.2 The selected block materials shall meet the requirements of compressive strength grade
and variation coefficient; and the porous bricks and autoclaved ordinary bricks used for load-
bearing walls shall still meet the requirements of flexural indicators.
3.2.3 The selected non-sintered porous blocks shall meet the requirements of minimum wall
thickness and minimum rib thickness; and the selection of load-bearing porous bricks and small
blocks shall meet the upper limit requirements of porosity.
4 Design
4.1 General
4.1.1 The masonry structure shall be designed according to the limit state of bearing
capacity; and structural measures shall be taken according to the characteristics of the
masonry structure to meet the requirements of the limit state of normal service and
durability.
4.1.2 The masonry structural members shall, according to their stress, calculate the bearing
capacity such as axial compression, eccentric compression, local compression, bending
and shearing, etc.; and the members shall be ensured to have sufficient strength to meet
safety requirements.
4.2 Multi-story and single-story masonry structures
4.2.1 The single-story masonry structure bearing the crane load shall adopt reinforced
masonry structure.
4.2.2 For the load-bearing structure of the hall roof of a single-story open house, brick
columns shall not be used in the following cases.
4.2.3 Unreinforced masonry members shall not be used for load-bearing wall beams in
multi-story masonry structure buildings to support. The wall beam design shall include the
structural requirements of the total height of the wall, span, height-span ratio of the wall
and joist, opening size and opening position.
4.3 Bottom frame-seismic wall masonry structure
4.3.1 The seismic wall structure at the bottom of a bottom frame-seismic wall masonry
structure building shall meet the following requirements.
4.3.2 The frame columns at the bottom of a bottom frame-seismic wall masonry structure
building shall meet the following requirements.
4.3.3 The structure of the concrete joist at the lower part of the wall of a building with a
bottom frame-seismic wall masonry structure shall meet the following requirements.
4.3.4 The floor slab structure of the building with bottom frame-seismic wall masonry
structure shall meet the following requirements.
4.4 Reinforced block masonry seismic wall structure
4.4.1 Reinforced block masonry seismic walls shall be filled with perforated concrete.
4.5 Infill walls
4.5.1 When the infill walls are arranged non-uniformly, the adverse impact of the
difference in mass and stiffness on the seismic resistance of the main structure shall be
considered.
4.5.2 The action of the infill wall shall include the self-weight of the wall, the weight of
the attachments on the wall, wind load and earthquake.
4.5.3 Infill walls shall meet the stability requirements under the influence of wind load and
earthquake action.
5 Construction and Acceptance
5.1 Construction
5.1.1 When the non-sintered blocks are built, the shrinkage control requirements after the
blocks are built on the wall shall be met.
5.1.2 The blocks that need to be wet before masonry shall be properly poured (sprayed)
with water, and dry bricks or bricks that are saturated with water shall not be used for masonry.
5.1.3 When laying masonry, the corners of the wall and the intersections of vertical and
horizontal shall be laid at the same time; brick columns shall not adopt the wrapping
method.
5.1.4 The openings, grooves and pipes in the masonry shall be reserved and pre-embedded
in accordance with the design requirements.
5.1.5 The masonry mortar shall be designed and tested for mix ratio. When the
composition of masonry mortar is changed, its mix ratio shall be re-determined.
5.1.6 For cement, ready-mixed mortar and other special mortars used in masonry mortar,
the impact of their storage period on the strength of the material shall be considered.
5.1.7 When mixing mortar on site, each component material shall be measured by mass.
After the masonry mortar is mixed, other binders, aggregates, and mixtures shall not be
arbitrarily mixed during use.
5.1.14 The construction of the connection structure of the infill wall shall meet the design
requirements.
5.2 Test of masonry structures
5.2.1 For newly-built masonry structures, when one of the following situations occurs, the
strength of the masonry mortar, the strength of the blocks or the compressive and shear
strength of the masonry shall be tested.
the characteristics of test items and test purpose; and the sampling site shall be
representative.
5.2.3 When selecting the on-site inspection method for newly developed masonry
structures, the following requirements shall be met.
5.3 Acceptance
5.3.1 The masonry structure quality acceptance data of the unit project shall meet the
requirements for overall project acceptance. When part of the masonry structure quality
acceptance data of the unit project is missing, the corresponding physical inspection or
sampling test shall be carried out.
5.3.2 The project construction quality of masonry structures shall meet the design
requirements; and the acceptance of construction quality shall include the following
contents.
5.3.3 For masonry cracks that may affect structural safety, inspection and appraisal shall
be carried out. If repair or reinforcement is required, a second acceptance shall be
conducted after the repair or reinforcement meets the requirements for use.
6 Maintenance and Dismantling
6.0.1 The weathered, leaking, cracked and damaged parts of the masonry structure shall
be inspected and repaired.
6.0.2 During the dismantling of masonry structures, measures shall be taken to reduce
damage to the blocks.
6.0.3 When the removed blocks are used to build masonry structures, they shall meet the
following requirements.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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