GB 50057-1994(2000) Code for lightning protection design of buildings
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
GB50057—94
Design code for lightning protection of buildings
Design code for protection of structures against lightning (2000 edition)
1994-04-18
1994-11-01
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Design code for lightning protection of buildings
Design code for protection of structures against lightningGB50057—94
(2000 edition)
Editor: Ministry of Machinery Industry of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: November 1, 1994
2001Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Partial Revision Announcement
No. 24
National Standard "Building Lightning Protection Design Code" GB50057—94, has been partially revised by the State Machinery Industry Bureau Design Institute in conjunction with relevant units. It has been reviewed by relevant departments and the partially revised provisions are now approved for implementation on October 1, 2000. The corresponding provisions in the original specification will be abolished at the same time. This is hereby announced. Ministry of Construction of the People's Republic of China
August 24, 2000
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of the National Standard "Code for Lightning Protection Design of Buildings"
Jianbiao [1994] No. 257
According to the requirements of the State Planning Commission's Document No. Jizong [1989] 30, the national standard "Code for Lightning Protection Design of Buildings" edited by the Ministry of Machinery Industry and revised jointly with relevant departments has been reviewed by relevant departments. The "Code for Lightning Protection Design of Buildings" GB50057-94 is now approved as a mandatory national standard and will be implemented from November 1, 1994. The original national standard "Code for Lightning Protection Design of Buildings" GBJ57-83 will be abolished at the same time. This standard is managed by the Ministry of Machinery Industry, and its specific interpretation and other work are the responsibility of the Design Institute of the Ministry of Machinery Industry, and its publication and distribution are organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
April 18, 1994
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Revision Notes
This specification is edited by our department in accordance with the requirements of the State Planning Commission's Document No. 1989J30, and is specifically compiled by our department's Design Institute based on the revision of the original specification. In the process of revising and compiling this specification, the revision group conducted a large amount of investigation and research, and widely solicited opinions and letters of review from relevant units and individuals across the country. Finally, our department reviewed and finalized the draft together with relevant departments.
This specification is divided into five chapters and six appendices. The main contents include general provisions, lightning protection classification of buildings, lightning protection measures for buildings, lightning protection devices, selection and arrangement of lightning arresters, etc. During the implementation of this specification, if you find that there is a need for modification or supplementation, please send your opinions and relevant materials to the Design Institute of the Ministry of Machinery Industry (No. 5, North West Third Ring Road, Beijing, Postal Code 100089) for reference in future revisions. Ministry of Machinery Industry
March 1994
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2
Chapter 3
Classification of Lightning Protection for Buildings
Lightning Protection Measures for Buildings·
Section 1
Section 2
Section 3
Section Section 4
Section 5
Chapter 4
General Provisions
Lightning Protection Measures for Class I Lightning Protection Buildings
Lightning Protection Measures for Class II Lightning Protection Buildings
Lightning Protection Measures for Class III Lightning Protection Buildings·Other Lightning Protection Measures…
Lightning Protection Devices
Section 1
Lightning Arresters
Section 2 Down Conductors
Section 3||t t||Grounding device
Selection and arrangement of lightning arresters
Chapter 5
Section 1 Selection of lightning arresters...
Section 2 Arrangement of lightning arresters·
Chapter 6 Protection against lightning electromagnetic pulses
Section 1
Section 2
Section 3
Section 4
Appendix 1
Appendix 2
Appendix 3
-General provisions
Lightning protection zone (LPZ)
Requirements for shielding, grounding and equipotential bonding·Requirements for surge protectors and others·
Expected number of lightning strikes per year for buildingsWww.bzxZ.net
Locations of buildings susceptible to lightning strikes
Conversion of impulse grounding resistance and power frequency grounding resistance of grounding devices
Engineering Construction Standards Full-text Information System
(23)
· (27)
·(28)
（45)
· (47)
·（48)
Engineering Construction Standard Full-text Information System
Appendix 4 Determination of the protection range of the lightning arrester by the rolling ball method Appendix 5 Shunt coefficient
Appendix VI Lightning Current
Appendix VII Calculation of Induced Voltage, Current and Energy in the Loop Appendix VIII Glossary
Appendix IX Explanation of Terms Used in This Code
Additional Explanations
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter I General
Article 1.0.1
This code is formulated to make lightning protection design of buildings (including structures, the same below) take lightning protection measures according to local conditions, prevent or reduce personal injury and loss of cultural relics and property caused by lightning strikes on buildings, and achieve safety, reliability, advanced technology and economic rationality. Article 1.0.2 This code applies to the lightning protection design of newly built buildings. This code does not apply to the lightning protection design of antenna towers, shared antenna TV receiving systems, oil tanks, and chemical outdoor devices.
Article 1.0.3
The lightning protection design of buildings shall be based on careful investigation of geographical, geological, soil, meteorological, environmental conditions and the laws of lightning activity and the characteristics of the protected objects, and the form and layout of lightning protection devices shall be studied in detail. Article 1.0.4
In addition to the provisions of this code, the lightning protection design of buildings shall also comply with the provisions of the relevant current national standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter II
Classification of Lightning Protection of Buildings
Article 2.0.1 Buildings shall be divided into three categories according to their importance, nature of use, possibility and consequences of lightning accidents. Article 2.0.2 In the event of one of the following circumstances, it shall be classified as a Class I lightning protection building: Buildings that manufacture, use or purchase and store large amounts of explosive materials such as explosives, gunpowder, detonators, pyrotechnics, etc., which may cause huge damage and casualties due to explosions caused by electric sparks.
2. Buildings with explosion hazard environments in Zone 0 or Zone 10. 3. Buildings with explosion hazard environments in Zone 1, where explosions caused by electric sparks will cause huge damage and casualties. Article 2.0.3 In the event of one of the following circumstances, it should be classified as a Class II lightning protection building: 1. Buildings under national key cultural relics protection. 2. National halls, office buildings, large exhibition and expo buildings, large railway stations, state guesthouses, national archives, important water supply pump rooms in large cities and other particularly important buildings.
3. Buildings that are of great significance to the national economy and are equipped with a large number of electronic equipment, such as national computing centers and international communication hubs. 4. Buildings that manufacture, use or store explosive substances, and where electric sparks are not likely to cause explosions or cause huge damage and casualties. 5. Buildings with explosion hazard environments in Zone 1, and where electric sparks are not likely to cause explosions or cause huge damage and casualties. 6. Buildings with explosion hazard environments in Zone 2 or Zone 11. 7. Open-air steel closed gas tanks with explosion hazards in industrial enterprises. 8. Ministry and provincial-level office buildings and other important or densely populated public buildings where the number of lightning strikes is expected to be greater than 0.06 times/a. 2
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
9. The number of lightning strikes expected to be greater than 0.3 times/a for residential buildings, office buildings and other general civil buildings.
Note: The expected number of lightning strikes shall be calculated according to Appendix 1 of this specification. Article 2.0.4 In the event of one of the following circumstances, it shall be classified as a third-class lightning protection building: 1. Buildings under provincial key cultural relics protection and provincial archives. 2. Ministry and provincial office buildings and other important or densely populated public buildings with an expected number of lightning strikes greater than or equal to 0.012 times/a and less than or equal to 0.06 times/a.
3. Residential buildings, office buildings and other general civil buildings with an expected number of lightning strikes greater than or equal to 0.06 times/a and less than or equal to 0.3 times/a. 4. General industrial buildings with an expected number of lightning strikes greater than or equal to 0.06 times/a.
5. According to the impact and consequences of lightning strikes on industrial production, combined with local meteorological, topographical, geological and surrounding environmental factors, determine the fire hazard environment in Zones 21, 22 and 23 that require lightning protection.
Sixth, in areas where the average thunderstorm days are greater than 15d/a, isolated tall buildings such as smoke towers and water towers with a height of 15m or more; in areas where the average thunderstorm days are less than or equal to 15d/a, isolated tall buildings such as smoke towers and water towers with a height of 20m or more. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Lightning Protection Measures for Buildings
Draft No. 3
Section 1 General Provisions
Article 3.1.1 All types of lightning protection buildings should take measures to prevent direct lightning strikes and lightning wave intrusion.
The first-class lightning protection buildings and the first-class lightning protection buildings specified in Article 2.0.3, Paragraphs 4, 5, and 6 of this Code should also take measures to prevent lightning induction. Article 3.1.2 Buildings equipped with lightning protection devices should adopt equipotential connection when the lightning protection devices cannot be isolated from other facilities and personnel in the buildings. Section 2 Lightning protection measures for Class I lightning protection buildings Article 3.2.1 Measures for direct lightning strikes for Class I lightning protection buildings shall meet the following requirements:
, Independent lightning rods or overhead lightning conductors (nets) shall be installed so that the protected buildings and objects protruding from the roof, such as wind caps and discharge pipes, are within the protection range of the lightning arrester. The mesh size of the overhead lightning arrester net should not be larger than 5mX5m or 6mX4m. 2. The following spaces outside the pipe openings of discharge pipes, breathing valves, exhaust pipes, etc. that discharge explosive gases, steam or dust shall be within the protection range of the lightning arrester: when there is a pipe cap, it shall be determined according to Table 3.2.1; when there is no pipe cap, it shall be a hemisphere with a radius of 5m above the pipe opening. The contact point between the lightning arrester and the lightning shall be located outside the above space. 3. For the discharge pipes, breathing valves, exhaust pipes, etc. that discharge explosive gases, steam or dust, when the discharge does not reach the explosive concentration, ignites and burns for a long time, ignites and burns as soon as it is discharged, and the ventilation pipes and safety valves whose discharge reaches the explosive concentration only when an accident occurs, the protection range of the flash device can only protect the pipe cap, and when there is no pipe cap, it can only protect the pipe mouth. 4. At least one down conductor should be installed at the pole tower of the independent lightning rod, the end of the overhead lightning conductor and each pillar of the overhead lightning protection network. For the pole tower and pillars made of metal or with welding, binding and connection of steel mesh, it is advisable to use them as down conductors. The pressure difference between the pressure in the space device outside the pipe mouth with a pipe cap and the surrounding air pressure within the protection range of the lightning rod. The specific gravity of the emission is heavier than air. Heavier than air. Lighter than air. Heavier or lighter than air. Vertical height above the pipe cap. Horizontal distance from the pipe mouth. V. Independent avoidance The distance between the lightning rod and the support of the overhead lightning conductor (net) and its grounding device to the protected building and the metal objects such as pipelines and cables connected to it (Figure 3.2.1) shall meet the requirements of the following expression, but shall not be less than 3m: Sa
Protected object
-Metal pipeline
Figure 3.2.1 Distance from lightning protection device to protected object 1. Above ground part: When h<5R,
Sa≥0.4(R+0.1 h)
When>5R,
S≥0.1(R+h)
2. Underground part:
Where Sa
Distance in air (m);
Engineering Construction Standard Full-text Information System
(3.2.1-1)
(3.2.1-2)
(3.2.1-3)1(R+h)
2. Underground part:
where Sa
distance in air (m);
Engineering Construction Standard Full-text Information System
(3.2.1-1)
(3.2.1-2)
(3.2.1-3)1(R+h)
2. Underground part:
where Sa
distance in air (m);
Engineering Construction Standard Full-text Information System
(3.2.1-1)
(3.2.1-2)
(3.2.1-3)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.