This code is formulated to improve the technical level of V-shaped folded plate roof design and construction, implement the national technical and economic policies, and achieve advanced technology, economic rationality, safety and applicability, and ensure quality. This code is applicable to the design and construction of folded reinforced concrete and prestressed concrete V-shaped folded plate roofs for industrial and civil buildings. JGJ/T 21-1993 V-shaped folded plate roof design and construction code JGJ/T21-1993 standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Design and Construction Specifications for V-shaped Folded Plate Roof
JGJ/T21-93
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Design and Construction Specifications for V-shaped Folded Plate Roof
JGJ/T21-93
China Petrochemical Corporation Beijing Petrochemical Engineering Company Compiled by
Approved by:
China Petrochemical Corporation Beijing Design Institute
Effective Date: 1
National Construction Ministry of Construction
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Notice on the Release of the Industry Standard "Design and Construction Specifications for V-Shaped Folded Plate Roofs"
Jianbiao [1993] No. 771
According to the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection (88) Chengbiaozi No. 141, the "Design and Construction Specifications for V-Shaped Folded Plate Roofs" edited by the Beijing Petrochemical Engineering Company of China Petrochemical Corporation and the Beijing Design Institute of China Petrochemical Corporation has been reviewed and approved as an industry standard, numbered JGJ/T21-93, and will be implemented from June 1994. The former ministry standard "Design and Construction Specifications for V-Shaped Folded Plate Roofs" (JGJ21-84) will be abolished at the same time.
This code is managed by the China Academy of Building Research, the unit responsible for building engineering standards and technology under the Ministry of Construction, and the specific interpretation and other work is the responsibility of Beijing Petrochemical Engineering Company of China Petrochemical Corporation.
This code is organized and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
October 25, 1993
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Engineering Construction Standards Full-text Information System
Main Symbols
Chapter 1 General
Chapter 2
Chapter 3
Chapter 4
Design Provisions·
Architectural Design
Section 1
Section 1
General Provisions:
Location Axis
Section 2
Drainage and Waterproofing·
Section 4
Architectural Thermal Engineering
Chapter 5 Folded Plate Calculation
Section 1
General Provisions
Section 2 Load
Section 3 Calculation of Internal Forces under Uniformly Distributed LoadsSection 4 Calculation of Sections with Concentrated Loads at FoldsChapter 6
Structural Construction
Section 1
General Provisions
Section 2 Reinforcement Configuration
Section 2 V Connection Nodes
Section 4 Open V-Shaped Folded Plates
Section 5
Edge Folds and Expansion Joints
Chapter 7 Construction Technology
General Provisions
Section 2 Component Fabrication
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Section 3 Transportation and Installation
Chapter 8 Roofing Engineering·
Section 1 Insulation Engineering
Section 2bZxz.net
Insulation Engineering
Section 3
Waterproof Engineering
Chapter 9
Roof Engineering Acceptance
Acceptance of V-shaped Folded Plate Components
Section 1
V-shaped Folded Plate Structural Performance Test...
Section 2
Section 3
Section 4
Appendix 1
Appendix 2
Appendix 3
Appendix 4
Appendix Record 5
Installation project acceptance
Roofing project acceptance
Internal force analysis of V-shaped folded plates under non-uniformly distributed loads·Calculation of V-shaped folded plates with holes.
Single fold overturning stability verification of V-shaped folded plates during installation·Simple diagram of commonly used construction machinery and equipment
Terms used in this code
Additional explanation
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Engineering construction standard full-text information system
Main symbols
Material properties
Concrete elastic modulus;
-Elastic modulus of steel;
f,-Design value of tensile strength of steel bars;
f'tf'.
-Standard value of axial tensile strength and design value of compressive strength of concrete during the construction stage;
Indicates the concrete strength grade with a standard value of cube strength of 30N/mm2.
Action and action effect
Design value of uniformly distributed load;
-Design value of concentrated load;
Standard value of snow load;
UcvOct
Basic snow pressure,
Design value of bending moment;
A-Design value of shear force,
The combined force of prestressed steel bars and non-prestressed steel bars when the normal prestress of concrete is equal to zero;
Normal stress of concrete;
Calculation section edge
Tensile stress at the corresponding construction stage.
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A-Member cross-sectional area;
Geometric parameters
A. —Member converted cross-sectional area;
W—Section resistance moment of the verification edge of the member; W. The converted section resistance moment of the component verification edge, B——V-shaped folded plate wave width;
t——V-shaped folded plate surface thickness;
b——V-shaped folded plate surface width;
1-V-shaped folded plate span;
l——V-shaped folded plate cantilever length;
-V-shaped folded plate inclination angle;
—V-shaped folded plate loss of height;
d—steel bar diameter;
the eccentric moment of the resultant force point of prestressed steel bars and non-prestressed epo
steel bars when the normal prestress of concrete is zero.
Calculation coefficient and others
-Structural importance coefficient;
-Plastic influence coefficient of concrete in tension zone;ut——Transverse snow distribution coefficient of V-shaped folded plate roof;Mv——Longitudinal snow distribution coefficient of V-shaped folded plate roof:ae——Concrete tensile stress limitation coefficient; —Ratio of elastic modulus of steel to elastic modulus of concrete;Specifically, the spatial distribution coefficient of longitudinal bending moment under the action of vertical concentrated load at the fold,31——The spatial distribution coefficient of longitudinal stress under the action of vertical concentrated load at the fold;Introduction——The spatial distribution coefficient of longitudinal bending moment under the action of horizontal concentrated load at gable fold;1——The spatial distribution coefficient of longitudinal stress under the action of horizontal concentrated load at gable fold. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 1 General Provisions
Article 1.0.1 This code is formulated to improve the technical level of V-shaped folded plate roof design and construction, implement the national technical and economic policies, and achieve advanced technology, economic rationality, safety and applicability, and ensure quality. Article 1.0.2 This code is applicable to the design and construction of folded reinforced concrete and prestressed concrete V-shaped folded plate roofs for industrial and civil buildings. Article 1.0.3 This code is compiled in accordance with the principles stipulated in the current national standard "Uniform Standard for Building Structure Design". Symbols, measurement units and basic terms are adopted in accordance with the provisions of the current national standard "General Symbols, Measurement Units and Basic Terms for Building Structure Design".
Article 1.0.4 When using folded plate roofs in special circumstances such as high temperature, corrosive media and explosion hazards, protective measures should be taken in accordance with the provisions of the current relevant national standards.
Article 1.0.5 The design and construction of V-shaped folded plate roofs shall comply with the provisions of this code and the relevant national standards in force. 71.ne
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Chapter 2 Materials
Article 2.0.1 The concrete strength grade of the V-shaped folded plate can be selected according to the provisions of Table 2.0.1.
Selection of concrete strength grade
Folding plate category
Reinforced concrete
V-shaped folding plate
Prestressed concrete
V-shaped folding plate
I, I grade steel bars
Main reinforcement type
Cold drawn low carbon steel wire
≥15m, ≥C40
≥15m, >C30
Carbon steel wire
≥18m, >C50
1≥18m, >C40
Note: The strength grade of the concrete filling in the upper and lower folds of the V-shaped folding plate should be the same as that of the V-shaped folding plate. Section 2.0.The steel used for the two V-shaped folded plates can be selected according to the provisions of Table 2.0.2. Among them, the steel used as lifting rings and dowels shall not be cold processed. Steel
Folded plate category
Reinforced concrete
V-shaped folded plate
Longitudinal main steel bars
I, I-grade steel bars
Longitudinal
Distribution steel bars on the plate
I-grade steel bars
Mesh steel bars,
Transverse steel bars
Class B cold-drawn
Low carbon steel wire,
【Grade steel bars
|Grade A cold-drawn low-phosphorus Grade B cold-drawn low-phosphorus
>18m is carbon
steel wire, carbon steel wire
prestressed concrete V steel wire; l≤18mm
shaped folded plate
is Grade A cold-drawn low-carbon
steel wire, carbon steel wire
Grade 1 steel bar
Note: The longitudinal distribution steel bars on the surface of the prestressed concrete V-shaped folded plate in the table are prestressed steel bars. Engineering Construction Standard Full Text Information System
Upper and lower folds
Additional steel bars
I, I level
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Chapter 3 Design Regulations
Article 3.0.1 V-shaped folded plate roof is suitable for areas with seismic fortification intensity of 9 degrees and below
Article 3.0.2 The scope of use of V-shaped folded plate roof shall meet the requirements of Table 3.0.2 The use of V-shaped folded plate roof Scope
Folded plate category
Reinforced concrete
V-shaped folded plate
Neck prestressed filter
V-shaped folded plate
Concentrated load or suspension crane
Concentrated load ≤40kN
Suspension crane lifting weight <3t
Concentrated load ≤40kN
Suspension crane lifting weight ≤3t
Note: When there is a reliable test basis, it may not be restricted by this table. Table 3.0.2
Bridge crane
Medium and light duty
Medium and light duty are not subject to
Heavy duty does not exceed
Article 3.0.3 The design of V-shaped folded plate roof should strive to unify the size of components and reduce the types of components to create favorable conditions for manufacturing and installation. Article 3.0.4 The geometric parameters of the V-shaped folded plate should be selected according to Table 3.0.4, and the geometric dimensions are shown in Figure 3.0.4. The length of the boom should not be greater than 6m Engineering Construction Standard Full Information System
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Figure 3.0.4 V-shaped folded plate geometric dimensions
V-shaped folded plate geometric parameters
Folded plate category
Reinforced concrete
V-shaped folded plate
Prestressed concrete
V-shaped folded plate
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Ratio of plate thickness to
Plate width
Ratio of span to
Wave width
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Chapter 4 Architectural Design
Section 1 General Provisions
Article 4.1.1 V-shaped folded plate roof can be used for industrial and civil buildings with roll waterproofing, coating waterproofing, and self-waterproofing of components, and can also be used for √-shaped folded plate roof with insulation layer. Article 4.1.2 Buildings using V-shaped folded plate roofs should consider the characteristics of the V-shaped folded plates, as well as the proportions between the roof and the building as a whole, and strive to be simple, generous and beautiful. Article 4.1.3 When embedded parts, hanging bars, piers, etc. are required for the V-shaped folded plate roof, they should be set at the upper and lower folds of the V-shaped folded plates, and corresponding anti-leakage measures should be taken. Article 4.1.4 When the V-shaped folded plate roof is used for a large amount of ash discharge in a factory building and its adjacent buildings, a walkway plate should be set between the folds of the V-shaped folded plates for easy cleaning and maintenance. Article 4.1.5 The distance from the lower edge of the fold of the V-shaped folded plate roof to the highest point of the bridge (beam) type crane. It should not be less than 300mm (Figure 4.1.5) to meet the requirements for crane installation and maintenance.
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