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GB 50144-2019: Standard for appraisal of reliability of industrial buildings and structures
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GB 50144-2019
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.
Table of Contents
Foreword ... 4
1 General provisions ... 8
2 Terms and symbols ... 8
2.1 Terms ... 8
2.2 Symbols ... 10
3 Basic requirements ... 11
3.1 General requirements ... 11
3.2 Procedure and content for appraisal ... 12
3.3 Rating standards for appraisal ... 15
4 Investigation and inspection ... 19
4.1 Investigation and inspection of using environment ... 19
4.2 Investigation and inspection of industrial buildings and structures ... 22
5 Structural analysis and check ... 25
6 Appraisal rating for structure members ... 26
6.1 General requirements ... 26
6.2 Concrete structure members ... 27
6.3 Steel structure members ... 32
6.4 Masonry structure members ... 35
7 Appraisal rating for structure system ... 38
7.1 General requirements ... 38
7.2 Foundation ... 39
7.3 Bearing substructure ... 41
7.4 Envelope structure system ... 45
8 Appraisal rating for industrial buildings ... 47
9 Appraisal rating for industrial structures ... 48
9.1 General requirements ... 48
9.2 Chimney ... 49
9.3 Concrete cooling tower ... 52
9.4 Silo ... 54
9.5 Gallery ... 56
9.6 Pipe support ... 57
9.7 Pond structure ... 58
9.8 Boiler steel structure ... 59
9.9 Duster structure ... 61
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
B.1 General requirements ... 67
B.2 Evaluation of residual durability life for concrete structures under industrial
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.
Appraisal units subdivided according to the different functions of the building structure
in the appraisal unit. Generally, Generally, industrial buildings can be divided into three
structure systems according to the basement foundation, upper load-bearing structure,
and envelope structure. For industrial structures, it also includes their special functional
structure systems.
2.1.14 member
A basic appraisal unit further subdivided in the structure system. It refers to a single
structure member that bears various actions, or an integral part of a load-bearing
structure.
2.1.15 member assemblage
A collection of homogeneous members. It is divided into important member assemblage
and less important assemblage.
2.1.16 items of assessment
Items for assessing the reliability of buildings and structures as well as their components.
2.1.17 important member
A member whose failure will cause other members to fail and endanger the safety of
the load-bearing structure system, or a member that directly affects the operation of
production equipment.
2.1.18 less important member
A member that its own failure is an isolated event, which will not cause failure of other
members and does not directly affect the operation of production equipment.
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:
1. When the designed service life is reached and intended to continue to be used.
2. When the purpose of use or the environment changes.
3. When structural renovations or extensions are carried out.
4. After a disaster or accident.
5. When there are serious quality defects or serious corrosion, damage or
deformation.
3.1.2 Appraisal of reliability shall be carried out for industrial buildings and structures
under the following circumstances:
1. When routine inspection identification is required during use and maintenance.
2. When large-scale maintenance is required.
3. In other situations where the grade of structural reliability needs to be mastered.
3.1.3 Special appraisal can be carried out for industrial buildings and structures under
the following circumstances:
1. When there are special requirements for structure maintenance and transformation.
2. When the structure has durability damage that affects its durability.
3. When the structure has fatigue problems that affect its fatigue life.
4. When there is obvious vibration effect on the structure.
5. When the structure requires long-term monitoring.
entrusting party and shall be determined after consultation with the appraisal party.
3.2.3 Preliminary investigation shall include the following work contents:
1. Consult the original design and construction materials, including engineering
geological survey reports, design calculations, design and construction drawings,
design change records, construction and construction negotiation records,
completion materials, etc.
2. Investigate the historical situation of industrial buildings and structures, including
previous inspection and observation records, previous maintenance and
reinforcement or transformation data, changes in use, changes in use conditions,
accident handling and disasters, etc.
3. Visit and inspect the site. The status quo, conditions of use, internal and external
environment, and existing problems of industrial buildings shall be investigated.
3.2.4 The appraisal plan shall be formulated according to the purpose, scope, content
and preliminary investigation results of the appraisal. It shall include appraisal basis,
detailed investigation and inspection content, inspection method, work schedule and
preparation and cooperation work to be completed by the entrusting party, etc.
3.2.5 Detailed investigation and inspection shall include the followings:
1. Investigate structural roles and disadvantages in the environment.
2. Check structural arrangement and construction, bracing systems, structural
members and connections.
3. Inspect the actual performance of structural materials and geometric parameters
of members. The actual performance of structures or members can also be verified
through load tests.
4. Investigate or measure the deformation of the foundation. Check the influence of
foundation deformation on the upper load-bearing structure, envelope structure
system and crane operation, etc. Excavation foundation inspection,
supplementary survey or on-site foundation bearing capacity test can also be
carried out.
5. Inspect the defects and damages, cracks, deformation or deviation, corrosion,
aging, etc. in the upper load-bearing structure or members, supporting rods and
their connections.
6. Check the safety condition and function of the building envelope system.
7. Check the safety status and function of the special functional structure system of
the structure.
"Technical standard for inspection of building structure" and the relevant
provisions of Chapter 6 and Chapter 7 of this Standard.
5. The defects and damage of the members and their nodes shall be conducted in
appearance. The location, scope, degree and form of defects and damages shall
be recorded in detail.
6. The performance of structure members, structural dynamic characteristics and
dynamic response can be tested through field tests according to the current
national standard GB/T 50344 "Technical standard for inspection of building
structure".
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:
1. The inspection of concrete strength shall be comprehensively determined by
coring, rebound, ultrasonic rebound and other methods.
2. The aging of concrete members can be determined through visual inspection,
concrete neutralization test, steel corrosion detection, degraded concrete
petrographic and chemical analysis, concrete surface permeability measurement,
etc.
3. For the inspection of steel bars in concrete, steel bars can be cut from concrete
members for mechanical performance and chemical composition inspection.
4.2.7 When it is necessary to perform steel performance inspection on steel structure
members, steel mechanical performance tests and main chemical composition analysis
shall be carried out. Steel products of the same specification for similar structure
members shall be inspected as a batch.
4.2.8 When there is a large area of corrosion on the steel structure members and the
cross-section is obviously weakened, it can be inspected according to the method in
Annex C of this Standard. The inspection contents for fatigue damage of steel crane
girders can be carried out according to the provisions in Annex D of this Standard.
4.2.9 When it is necessary to test the masonry quality and masonry strength of masonry
structure members, in addition to the provisions of Article 4.2.5 of this standard, the
following provisions shall also be met:
1. For masonry strength testing, an appropriate testing method shall be selected
according to the current national standard GB/T 50315 "Technical standard for
site testing of masonry engineering".
2. For structural members whose masonry quality least meets the requirements of
the current national standard GB 50203 "Code for acceptance of constructional
quality of masonry structures", the number of samples shall be increased.
4.2.10 For the investigation of the envelop structure, the relevant drawings and
materials shall be consulted. Carry out on-site verification of the layout of the envelope
structure system. Investigate the actual conditions of various envelop members and
their structural connections, as well as the use function, aging damage, failure and
failure of the envelop system.
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.
5.0.3 The standard value of the effect on the structure shall be taken according to the
provisions of Article 4.1.3 of this Standard. The sub-item coefficients and combination
coefficients of action effects shall be determined according to the provisions of the
current national standard GB 50009 "Load code for the design of building structures".
According to the principle of having the same exceeding probability in different periods,
the sub-item coefficients of wind load and snow load can be appropriately reduced
according to the target working life.
5.0.4 When structural members are subject to non-negligible effects of temperature,
foundation deformation, etc., additional effects shall be considered.
5.0.5 The standard value of material strength shall be selected according to the
following principles according to the actual condition of the structure member an...