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Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Smoke Design Code
GBJ51—83
1883 Beijing
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Smoke Design Code
GBJ51—83
Editor Department: Ministry of Metallurgical Industry of the People's Republic of China Approval Department: State Planning Commission of the People's Republic of China Trial Date: April 1, 1984
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on Issuing the "Smoke Window Design Code" Jibiao [1983] No. 1500
According to the requirements of the former State Construction Commission (73) Jiangeshezi No. 239, the "Smoke Window Design Code" compiled by the Ministry of Metallurgical Industry together with relevant departments and units has been reviewed by relevant departments and is now approved as the "Smoke Window Design Code" GBJ51-83 as a national standard, which will be implemented on a trial basis from April 1, 1984. This code is managed by the Ministry of Metallurgical Industry, and its specific interpretation and other work are the responsibility of the Baotou Iron and Steel Design Institute of the Ministry of Metallurgical Industry.
National Planning Commission of the People's Republic of China October 7, 1983
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Preparation Instructions
This specification is prepared by the Baotou Iron and Steel Design Institute of the Ministry of Metallurgical Industry in conjunction with relevant design, construction, scientific research, colleges and universities, etc., in accordance with the notification of the former State Construction Commission (73) No. 239.
In the process of preparing this specification, we insisted on investigation and research, summarized practical experience, conducted necessary scientific experiments, and widely solicited opinions from all parties. Finally, we reviewed and finalized it in conjunction with relevant departments.
This specification is divided into eight chapters and nine appendices. The main contents include: brick chimney, reinforced brick chimney, reinforced concrete chimney, rigid foundation, plate foundation and shell foundation. In the preparation work, attention was paid to the coordination and unification with the current relevant specifications in my country. During the trial implementation of this specification, if any amendments or supplements are found, please send your comments and materials to Baotou Iron and Steel Design Institute and copy them to our department for reference during revision. Ministry of Metallurgical Industry
August 20, 1983
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 General Provisions·
Chapter 2 Materials
Section 1 Masonry·
Section 2 Concrete
Section 3 Steel Bars and Steel
Material Thermal Calculation Indicators
Section 4
Chapter 3
Basic Provisions for Design and Calculation·
Section 1
Section 2| |tt||Section 3
Section 4
General Provisions
Allowable Value of Heating Temperature
Safety Factor
Allowable Value of Crack Width
Section 5 Allowable Value of Foundation Deformation
Chapter 4
Temperature Calculation
Section 1
Section 2
General Provisions
Calculation of Heating Temperature of Cylinder Body·
Chapter 5 Calculation of Cylinder Wall of Brick Smoke Stack
Section 1
General Provisions
Section 2||t t||Strength calculation and crack resistance verification of horizontal sections Hoop calculation
Section 3:
Circumferential reinforcement calculation
Section 4
Section 5
Longitudinal reinforcement calculation
Reinforced concrete chimney wall calculation
Chapter 6
Section 1
Section 2
Section 3
General provisions
Additional bending moment calculation·
Strength calculation
Stress calculation in the service stage
Section 4|| tt||Section 5 Crack Width Verification·
Chapter 7 Foundation Calculation
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Section 1
General Provisions
Section 2
Foundation Calculation
Section 3
Section 4
Section 5
Rigid Foundation Calculation
Plate Foundation Calculation…
Shell Foundation Calculation
Chapter 8
Section 1|| tt||Section 2
Section 3
Section 4
Section 5
Section 6
Appendix 1
Appendix 2
Appendix 3
Appendix 4
Appendix 5
Appendix 6
Appendix 7
Appendix 8
Brick smokestack wall
Reinforced concrete smokestack wall
Lining and insulation layer:
Smokestack accessories
********73
Reinforcement Calculation of additional bending moment of concrete chimney considering earthquakes Formula for additional bending moment at representative section of cylinder without cyclic calculation 75 Calculation formula for geometric characteristics of annular section
Strength calculation chart
Stress calculation chart in use stage
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Calculation of final settlement and inclination of annular and circular foundations….……83 Calculation formula for edge force of combined shell foundation
Calculation formula for parameters m, m at the edge of small diameter and large diameter of shell
Appendix 9|| tt||Explanation of terms used in this specification
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Engineering Construction Standard Full-text Information System
Basic symbols
Internal and external forces
M—bending moment under load, referred to as bending moment, M—bending moment under wind load, referred to as wind bending moment, M—additional bending moment;
M—earthquake bending moment;
Maf—earthquake additional bending moment,
N—longitudinal force under load, referred to as longitudinal force ; G is the deadweight of the foundation and the weight of the soil on the foundation; T is the shear force,
is the local punching load of the foundation;
M, Ma
Ha, H,-
are the membrane radial force and radial force per unit arc length of the shell respectively;
are the membrane annular force and annular force per unit length of the shell respectively,
are the radial bending moment and shear force per unit arc length of the shell respectively;
are the unit arc length radial bending moment of the small diameter edge and the large diameter edge of the shell respectively;
are the unit length horizontal thrust of the small diameter edge and the large diameter edge of the shell respectively,
M. The annular bending moment of the shell ring beam.
T,--smoke temperature,
T--air temperature;
t--heating temperature of the calculation point;
R. - the total thermal resistance of the lining, insulation layer and cylinder wall, Ro, R - the thermal resistance of the inner surface of the lining and the outer surface of the cylinder wall respectively;
Engineering Construction Standard Full-text Information System
In - thermal conductivity;
ai - heat absorption coefficient of the inner surface of the lining;
α - heat release coefficient of the outer surface of the cylinder wall,
△t - temperature difference;
t - heating temperature of the inner surface of the concrete cylinder wall; t, - heating temperature of the steel bar.
Ogt, ogt-
Pmax, Pmin-
are respectively the compressive stress of concrete under load and the combined action of load and temperature;
are respectively the tensile stress of steel bars and hoop;
are respectively the tensile and compressive stress of steel bars under temperature; the compressive stress of brickwork under temperature; the average pressure on the bottom surface of the foundation;
are respectively the maximum and minimum pressures on the edge of the bottom surface of the foundation; - the pressure of the bottom surface of the foundation under axial load, - the pressure of the bottom surface of the foundation under bending moment. Material calculation index
R. ——Axial compressive design strength of concrete; R.—Bending compressive design strength of concrete; R,—Tensile design strength of concrete;
R—Crack design strength of concrete;
Ra, R—Axial compression and bending compression design strength of concrete under temperature;
Ru, R—Tensile and crack design strength of concrete under temperature;
—Tensile and compression design strength of steel bars; Rgt, Rgt—Tensile and compression design strength of steel bars under temperature;
Engineering Construction Standard Full Text Information System
WEngineering Construction Standard Full Text Information System
E, E. —Elastic modulus of concrete and steel bars; E, Eu—Elastic modulus of concrete and hoop under temperature; B—Converted elastic modulus of hoop;
E—Elastic modulus of brick masonry:
E,—Elastic modulus of brick masonry under temperature. Geometric characteristics
A, Ao—are the cross-sectional area and the converted cross-sectional area respectively; A.
—the total area of the longitudinal reinforcement of the calculated section or the cross-sectional area of the annular reinforcement per meter in height;
As—the cross-sectional area of the hoop;
F—the area of the bottom surface of the foundation;
5,—are the thickness of the cylinder wall (or shell) and the effective thickness respectively; r—the core distance of the section;
d—the diameter of the reinforcement; Www.bzxZ.net
the distance from the outer edge of the cylinder wall to the center of gravity of the annular reinforcement; mex
——maximum crack width of concrete;
Lf——average spacing of concrete cracks; S
——radial length of shell;
——distance from longitudinal force to the center of section;
——distance from longitudinal force to the center of gravity of section;
J——moment of inertia of section;
W——elastic resistance moment of section;
9——half angle of simple wall opening.
Calculation coefficient
KDesign safety factor;
—Elastic modulus reduction coefficient of concrete under temperature-Axial compression and bending compression design strength reduction coefficients of concrete under temperature;
Engineering Construction Standard Full-text Information System
WEngineering Construction Standard Full-text Information System
1, Yu——Respectively tensile and cracking design strength reduction coefficients of concrete under temperature;
%—Linear expansion coefficient of brickwork under temperature;%a—Deformation coefficient of concrete under temperature;%——Linear expansion coefficient of steel bar under temperature;a
—Eccentricity influence coefficient of longitudinal force of brickwork;——Reinforcement ratio,
n—Ratio of elastic modulus of steel bar to concrete under temperature;-Coefficient related to the surface shape of steel bar. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 1 General
Article 1.0.1 In order to achieve advanced technology, economic rationality, safety and applicability, and ensure quality in the design of chimneys, this specification is specially formulated. Article 1.0.2 This specification applies to the design of brick chimneys and reinforced concrete chimneys with a height of no more than 210 meters.
Article 1.0.3 When designing the following chimneys, the provisions of the current relevant specifications shall also be met:
1. Chimneys located in areas such as collapsible loess, expansive soil, or underground mining areas; 2. Chimneys with a sulfur dioxide content of more than 1% (volume ratio) in the flue gas and a sulfur dioxide content of less than 1%, but the flue gas temperature is lower than 100°C or the relative humidity of the flue gas exceeds 60%;
3. Chimneys with other corrosive gases in the flue gas. Engineering Construction Standard Full-text Information System
1
Engineering Construction Standard Full-text Information System
Chapter 2 Materials
Section 1 Bricks
Article 2.1.1 The materials for brick chimney walls and reinforced brick chimney walls shall be adopted in accordance with the following provisions:
1. Standard or special-shaped first-class ordinary clay bricks should be used for the walls, and the grade should not be lower than 75. If there are anti-freeze requirements, the anti-freeze index of the bricks should comply with relevant regulations;
2. No. 25 mixed mortar should be used for brick cylinder walls, and within 5 meters of the top, the mortar grade should be increased to No. 50;
3. For reinforced brick cylinder walls, cement-lime mixed mortar of not less than No. 50 should be used. Article 2.1.2 The lining materials of the smokestack shall be adopted in accordance with the following provisions: 1. When the flue gas temperature is lower than 400℃, No. 75 ordinary clay bricks and No. 25 mixed mortar can be used; 2. When the flue gas temperature is 400-500℃, No. 75 ordinary clay bricks and heat-resistant mortar can be used; 3. When the flue gas temperature is higher than 500℃, clay refractory bricks, refractory concrete prefabricated blocks and clay fire mud slurry can be used.
Article 2.1.3 The materials for rough stone foundation shall be adopted according to the following provisions according to the moisture degree of the base soil:
1. When the base soil is slightly wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 25;
2. When the base soil is very wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 50;
3. When the base soil is saturated with water, use stone materials of not less than No. 300 and cement mortar of not less than No. 50.
Engineering 2 Construction Standard Full Text Information SystemThe lining materials of 2 smoke windows should be adopted according to the following provisions: 1. When the flue gas temperature is lower than 400℃, No. 75 ordinary clay bricks and No. 25 mixed mortar can be used;
2. When the flue gas temperature is 400-500℃, No. 75 ordinary clay bricks and heat-resistant mortar can be used;
3. When the flue gas temperature is higher than 500℃, clay refractory bricks, refractory concrete prefabricated blocks and clay fire mud slurry can be used.
Article 2.1.3 The materials for rough stone foundation shall be adopted according to the following provisions according to the moisture degree of the base soil:
1. When the base soil is slightly wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 25;
2. When the base soil is very wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 50;
3. When the base soil is saturated with water, use stone materials of not less than No. 300 and cement mortar of not less than No. 50.
Engineering 2 Construction Standard Full Text Information SystemThe lining materials of 2 smoke windows should be adopted according to the following provisions: 1. When the flue gas temperature is lower than 400℃, No. 75 ordinary clay bricks and No. 25 mixed mortar can be used;
2. When the flue gas temperature is 400-500℃, No. 75 ordinary clay bricks and heat-resistant mortar can be used;
3. When the flue gas temperature is higher than 500℃, clay refractory bricks, refractory concrete prefabricated blocks and clay fire mud slurry can be used.
Article 2.1.3 The materials for rough stone foundation shall be adopted according to the following provisions according to the moisture degree of the base soil:
1. When the base soil is slightly wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 25;
2. When the base soil is very wet, use stone materials of not less than No. 200 and mixed mortar of not less than No. 50;
3. When the base soil is saturated with water, use stone materials of not less than No. 300 and cement mortar of not less than No. 50.
Engineering 2 Construction Standard Full Text Information System
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