GB/T 22395-2022 English PDF (GBT22395-2022)

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GB/T 22395-2022: Specification for design of boiler steel structures
GB/T 22395-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
CCS J 98
Replacing GB/T 22395-2008
Specification for design of boiler steel structures
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 General requirements ... 8
5 Provisions on deformation of materials, design indicators, structural (component) .. 9
6 Arrangement of boiler steel structure ... 15
7 Actions and combinations of effects ... 17
8 Structural analysis ... 32
9 Beam design ... 33
10 Column design ... 57
11 Design of support system ... 97
12 Connection design ... 104
13 Check calculation of seismic bearing capacity of connection joints of boiler steel
structure and seismic construction measures ... 141
14 Anti-rust and anti-corrosion treatment of boiler steel structure ... 147
Specification for design of boiler steel structures
1 Scope
This document specifies the design principles and methods for steel structures of
supported and suspended boilers.
This document applies to the design of steel structures for supported and suspended
boilers.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 700 Carbon structural steels
GB/T 1228 High strength bolts with large hexagon head for steel structures
GB/T 1229 High strength large hexagon nuts for steel structures
GB/T 1230 High strength plain washers for steel structures
GB/T 1231 Specifications of high strength bolts with large hexagon head, large
hexagon nuts, plain washers for steel structures
GB/T 1591 High strength low alloy structural steels
GB/T 3632 Sets of torshear type high strength bolt hexagon nut and plain washer
for steel structures
GB/T 5117 Covered electrodes for manual metal arc welding of non-alloy and fine
grain steels
GB/T 5118 Covered electrodes for manual metal arc welding of creep-resisting
steels
GB/T 5293 Solid wire electrodes, tubular cored electrodes and electrode/flux
combinations for submerged arc welding of non-alloy and fine grain steels
GB/T 5313 Steel plates with through-thickness characteristics
GB/T 12470 Solid wire electrodes, tubular cored electrodes and electrode/flux
combinations for submerged arc welding of creep-resisting steels
GB 50009 Load code for the design of building structures
GB 50011 Code for seismic design of buildings
GB 50017-2017 Code for design of steel structures
GB 50019 Code for design of heating ventilation and air conditioning in industrial
buildings
GB 50205 Standard for acceptance of construction quality of steel structures
GB 50661 Code for welding of steel structures
JGJ 82 Technical specification for high strength bolt connections of steel structures
JGJ 99-2015 Technical specification for steel structure of tall building
NB/T 47043 Technical specification for manufacture of boiler steel structures
NB/T 47055 Painting and packing specification of boiler
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Frame structure
A structure, which is capable of resisting shear and bending AND is composed of
columns and beams rigidly connected.
3.2
Frame-bracing structure
A structure, that consists of a frame and braces AND together forms a lateral force-
resistant system.
3.3
Bracing structure
A structure, in the plane where the beam-column member is located, where bracing
members are arranged obliquely, to support the axial stiffness against lateral action.
4 General requirements
4.1 The steel structure of the boiler supports the components of the boiler body;
maintains their relative positions; bears wind load, snow load, seismic action; bears the
load provided by the design organization of the power station and the load approved to
act on the steel structure of the boiler. Except for special requirements, boiler steel
structures do not directly bear dynamic loads.
4.2 When designing boiler steel structures, structural schemes, materials, connection
methods and structural measures shall be reasonably selected, to meet the strength,
stability and rigidity requirements of structural components, during transportation,
installation, use.
4.3 The boiler steel structure adopts the limit state design method based on probability
theory; calculates with the partial factor design expression; is designed according to the
limit state of bearing capacity and the limit state of normal service.
4.4 The limit state of bearing capacity includes: strength failure of components or
connections, brittle fracture, unsuitable for continuous load bearing due to excessive
deformation, loss of stability of structures or components, structure transformation into
a mobile system and structural overturning. The limit state of normal service includes:
the deformation affecting the normal use or appearance of structure, components or
non-structural components, the vibration that affects normal use, the local damage that
affects normal use or durability.
4.5 When designing the boiler steel structure, according to the limit state of bearing
capacity, the basic combination and accidental combination of load (action) effects shall
be adopted. When designing the boiler steel structure, according to the limit state of
normal service, the standard combination of load (action) effects shall be adopted.
4.6 The steel structure of boilers, in areas with seismic fortification intensity of 6
degrees or above, shall be subjected to seismic design. This document is applicable to
the design of boiler steel structures, in areas with seismic fortification intensity ranging
from 6 to 9 degrees. When the seismic fortification intensity is greater than 9 degrees,
it shall follow special provisions.
4.7 The steel structure of boilers, which adopts open-air layout and tight enclosure, shall
be checked for wind resistance.
4.8 Components shall avoid the effect of high temperature (above 150 °C). For
components subjected to high temperature for a long time, in addition to selecting
suitable steel materials, heat insulation or cooling measures shall be taken.
4.9 The temperature segment length (distance of expansion joints) of the steel structure
of the boiler shall not exceed 120 m for open-air layout and 150 m for tight enclosure;
the influence of temperature stress and temperature deformation may not be included.
4.10 For boiler steel structures located in cold regions, measures shall be taken during
design, to improve the structure's resistance to brittle fracture.
4.11 No matter what connection form is used, for the joints of the boiler steel structure,
when the joints are regarded as rigid connections, it shall comply with the assumption
that the intersection angle of the members at the joints during the stress process does
not change; at the same time, the connection shall have sufficient strength, to withstand
all the most unfavorable internal forces, which are transmitted by the joints at the ends
of the joint members. When the joi...