GB 50144-2019 PDF English
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GB 50144-2019: Standard for appraisal of reliability of industrial buildings and 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/GB50144-2019
UDC GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 50144-2019
Standard for appraisal of reliability of industrial buildings
and structures
Issued on. JUNE 19, 2019
Implemented on. DECEMBER 01, 2019
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
Standard for appraisal of reliability of industrial buildings
and structures
Prepared 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. DECEMBER 1, 2019
China Building Industry Press
2019 Beijing
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China
No. 172 of 2019
Table of Contents
Foreword... 4
1 General provisions... 8
2 Terms and symbols... 8
3 Basic requirements... 11
4 Investigation and inspection... 19
5 Structural analysis and check... 25
6 Appraisal rating for structure members... 26
7 Appraisal rating for structure system... 38
8 Appraisal rating for industrial buildings... 47
9 Appraisal rating for industrial structures... 48
10 Appraisal report... 64
Annex A Determination method for single member... 65
Annex B Evaluation of residual durability life for concrete structures under industrial
atmospheric environment... 67
atmospheric environment... 68
Annex C Detection of corrosion of steel members... 76
Annex D Fatigue performance evaluation of steel crane girders... 78
Annex E Evaluation of residual fatigue life of steel crane girders... 80
Annex F Appraisal of vibration impact on the superstructure... 82
Annex G Monitoring and evaluation of structural work condition... 85
Annex H Table of appraisal rating for industrial buildings and structures... 87
Explanation of wording in this Standard... 88
List of quoted standards... 89
Standard for appraisal of reliability of industrial buildings
and structures
1 General provisions
1.0.1 This Standard is formulated in order to standardize the appraisal of reliability of
industrial buildings, ensure the quality of appraisal, and strengthen the safety
management of industrial buildings.
1.0.2 This Standard applies to the reliability appraisal of the following existing
industrial buildings and structures.
1.Industrial buildings such as single-story and multi-story factory buildings with
concrete structures, steel structures, and masonry structures as load-bearing
structures;
2.Industrial structures such as smoke, reinforced concrete cooling towers, storage
bins, corridors, pipe supports, pools, boiler steel structure supports, dust collector
structures, etc.
1.0.3 The appraisal of reliability of industrial buildings and structures shall not only
implement this Standard, but also comply with the current relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 existing industrial buildings and structures
Built buildings and structures that serve industrial production.
2.1.2 existing structure
Various types of members and their combinations that have been built.
2.1.3 appraisal of reliability
Technical activities such as investigation, inspection, analysis checking calculation and
assessment of the safety and serviceability of existing industrial buildings and structures.
Safety includes bearing capacity and overall stability, etc. Serviceability includes
applicability and durability.
2.1.4 appraisal of safety
Technical activities such as investigation, inspection, checking calculation, analysis and
assessment of the structural bearing capacity and overall structural stability of existing
industrial buildings and structures.
2.2 Symbols
2.2.1 Structural properties and effects
h - Height of the frame floor or the floor height of the multi-storey factory building.
H - Total height from the top of the foundation to the top of the column.
l0 - Calculated span or calculated length of member.
R - Resistance of structures or members.
S - Effects of structures or members.
- Structural importance coefficient.
2.2.2 Appraisal rating
a, b, c, d - assessment rating for member.
A, B, C, D - assessment rating for structure system.
I, II, III, IV - assessment rating for appraisal unit.
3 Basic requirements
3.1 General requirements
3.1.1 Appraisal of reliability shall be carried out for industrial buildings and structures
under the following circumstances.
3.1.2 Appraisal of reliability shall be carried out for industrial buildings and structures
under the following circumstances.
3.1.3 Special appraisal can be carried out for industrial buildings and structures under
the following circumstances.
3.1.4 Appraisal of safety can only be carried out for industrial buildings and structures
under the following circumstances.
3.1.6 The target working life for appraisal shall be based on the use history of industrial
buildings and structures, current technical conditions and future maintenance plans. It
shall be mutually agreed upon by the entrusting party and the appraisal party. For
appraisal units with different appraisal objects, different target working life can be
determined.
3.2 Procedure and content for appraisal
3.2.1 The appraisal of reliability of industrial buildings and structures shall be carried
out according to the prescribed procedures (Figure 3.2.1).
3.2.6 In the reliability analysis, structural analysis, inspection calculation and
evaluation shall be carried out on the structural members, structure systems and
appraisal units of the building according to the detailed investigation and inspection
results.
3.2.7 When it is found that the investigation and inspection data are insufficient during
the process of appraisal of reliability for industrial buildings and structures,
supplementary investigation and inspection shall be carried out in a timely manner.
3.3 Rating standards for appraisal
4 Investigation and inspection
4.1 Investigation and inspection of using environment
4.1.1 The investigation and inspection for conditions of use shall include the
investigation and inspection on structural effects, use environment and use history.
Potential changes in conditions of use over the target working life shall be considered
in the investigation.
4.1.2 For the investigation on structural effects, the corresponding items in Table 4.1.2
can be selected.
4.1.3 The standard value of the effect on the structure shall be taken according to the
following provisions.
4.1.4 In the investigation of equipment load, in addition to consulting equipment and
material transportation load data to understand the process and actual use conditions,
the accumulation load of materials and equipment shall also be considered when
equipment maintenance and production are abnormal. Test when necessary.
4.1.5 The ash accumulation load on the roof, floor, and platform shall investigate the
ash accumulation range, thickness distribution, ash accumulation speed, and ash
cleaning system, etc. Test the thickness of dust accumulation and dry and wet weight.
The standard value of dust load shall be determined in combination with the
investigation situation.
4.1.8 The use environment of industrial buildings and structures can be investigated
according to the items listed in Table 4.1.8.
4.2 Investigation and inspection of industrial buildings and structures
4.2.1 The investigation and inspection of industrial buildings and structures shall
include foundations, superstructures and envelopes.
4.2.4 For the investigation and inspection of the upper load-bearing structure, it can
choose the items in Table 4.2.4.
4.2.5 Structural and material performance, geometric dimensions and deformation,
defect and damage inspections shall comply with the following regulations.
4.2.6 When it is necessary to carry out material performance and durability testing on
concrete structure members, in addition to implementing the provisions in Article 4.2.5
of this Standard, the following provisions shall also be complied with.
5 Structural analysis and check
5.0.1 Structural or member analysis and check shall be carried out according to the limit
state of bearing capacity and the limit state of normal service. Structural or member
analysis and verification methods shall comply with the provisions of the current
national standards GB 50010 "Code for design of concrete structures", GB 50017 "Code
for Design of Steel Structure" and GB 50003 "Code for design of masonry structures".
5.0.2 The calculation model adopted in the structural analysis shall conform to the
actual stress, structural condition and boundary conditions of the structure.
5.0.4 When structural members are subject to non-negligible effects of temperature,
foundation deformation, etc., additional effects shall be considered.
5.0.7 When the surface temperature of the concrete structure is higher than 60°C for a
long time, the change of material properties shall be considered. When the surface
temperature of the steel structure is higher than 100°C, the reduction of its strength and
stiffness shall be considered. When the temperature of the high-strength bolted joint is
higher than 100°C or has experienced a high temperature higher than 100°C, the
reduction of its anti-slip load-bearing capacity shall be considered.
5.0.8 When it is necessary to test the load-bearing performance and service performance
of structure members, it shall be carried out in accordance with the current national
standard GB/T 50344 "Technical standard for inspection of building structure".
6 Appraisal rating for structure members
6.1 General requirements
6.1.1 For the appraisal rating of a single member, its safety grade and serviceability
grade shall be assessed. When it is necessary to assess its reliability grade, it shall be
determined according to the following principles according to the assessment results of
safety grade and serviceability grade.
6.1.2 The safety and serviceability grades of members shall be assessed according to
the following provisions.
6.2 Concrete structure members
6.2.1 The safety grade of concrete members shall be assessed according to the two items.
bearing capacity, structure and connection. The lower grade shall be taken as the safety
grade of the member.
6.2.2 The bearing capacity items of concrete members shall be graded according to the
provisions in Table 6.2.2.When compression and baroclinic cracks appear in the
member, the bearing capacity item is directly rated as grade c or d depending on its
severity. When excessively wide tensile cracks, excessive deformation, serious defect
damage and corrosion occur, the impact of the unfavorable conditions on the bearing
capacity rating shall be analyzed, and the rating of the bearing capacity item shall not
be higher than grade b.
6.2.5 Cracks in concrete members can be graded according to the following regulations.
6.2.8 The corrosion items of concrete members include corrosion of steel bars and
corrosion of concrete. They shall be graded according to the provisions of Table 6.2.8.
The grade shall be the lower one among the steel bar corrosion and concrete corrosion
assessment results.
6.3 Steel structure members
6.3.1 The safety grade of steel members shall be assessed according to two items of
bearing capacity and structure. The lower grade shall be taken as the safety grade of the
member.
6.4 Masonry structure members
6.4.1 The safety grade of masonry members shall be assessed according to the two items.
bearing capacity, structure and connection. The lower grade shall be taken as the safety
grade of the member.
7 Appraisal rating for structure system
7.1 General requirements
7.1.1 For the appraisal rating of the structure system of industrial buildings and
structures, the safety grade and serviceability level of the three structure systems. the
foundation, the upper load-bearing structure and the envelope structure shall be
assessed, respectively.
7.1.2 The reliability grade of the structure system shall be determined according to the
following principles according to the assessment results of its safety grade and
serviceability grade.
7.2 Foundation
7.2.1 The safety grade assessment of the foundation shall follow the following
principles.
7.2.2 When the safety of the ground foundation is assessed according to the observation
data of the foundation deformation and the inspection results of the industrial building
status, the grade shall be assessed according to the provisions in Table 7.2.2.
7.2.3 When the safety of the ground foundation is assessed according to the bearing
capacity item, the grade shall be assessed according to the provisions in Table 7.2.3.
7.3 Bearing substructure
7.3.1 The safety grade of the upper load-bearing structure shall be assessed according
to the two items. structural integrity and load-bearing function. Take the lower grade as
the safety grade of the upper load-bearing structure. If necessary, the influence of
excessive horizontal displacement or obvious vibration on the safety of the structure
system or part of it shall be considered.
7.4 Envelope structure system
7.4.1 The safety grade of the envelope structure system shall be assessed according to
the envelope structure's load-bearing function and structural connection. Take the lower
assessment grade of the two items as the safety grade of the envelope structure system.
The assessment grade of the load-bearing function of the envelope structure shall be
based on its structural category.
8 Appraisal rating for industrial buildings
8.0.1 Industrial buildings can be assessed for reliability grades according to the divided
appraisal units. The reliability grade of the appraisal unit shall be assessed based on the
reliability grades of the foundation, upper load-bearing structure and envelope structure
system according to the following principles.
8.0.2 Industrial buildings can be assessed for safety grades according to the divided
appraisal units. The safety grade of the appraisal unit shall be assessed according to the
safety grade of the foundation, upper load-bearing structure and envelope structure
system according to the following principles.
8.0.3 Industrial buildings can be assessed for serviceability grades according to the
divided appraisal units.
9 Appraisal rating for industrial structures
9.1 General requirements
9.1.1 Industrial structures shall be assessed according to their structural layout and
composition by members, structure systems, and appraisal units. Their reliability grades
shall be assessed hierarchically.
9.2 Chimney
9.2.1 The appraisal of reliability of chimney shall be divided into three structure
systems. the foundation, the wall and the supporting structure, the heat insulation layer
and the inner lining.
9.2.2 The safety grade and serviceability grade of the foundation shall be assessed
according to the relevant provisions of 7.2 of this Standard. Its reliability grade can be
determined according to the lower grade of safety grade and serviceability grade.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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