Search result: GB 50981-2014
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Code for seismic design of mechanical and electrical equipment
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GB 50981-2014
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| Standard ID | GB 50981-2014 (GB50981-2014) | | Description (Translated English) | Code for seismic design of mechanical and electrical equipment | | Sector / Industry | National Standard | | Classification of Chinese Standard | P15 | | Classification of International Standard | 91.120.25 | | Word Count Estimation | 74,782 | | Date of Issue | 10/9/2014 | | Date of Implementation | 8/1/2015 | | Quoted Standard | GB 50011; GB 50015; GB 50028; GB 50032; GB 50051 | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Ministry of Housing and Urban-Rural Development of the People's Republic of China | | Summary | This Standard applies to earthquake intensity of 6 degrees to 9 degrees in mechanical and electrical engineering seismic design of buildings, not for seismic intensity greater than 9 degrees or have special requirements for seismic design of building elec |
GB 50981-2014 English name.Code for seismic design of mechanical and electrical equipment
1 General
1.0.1 In order to implement the "Construction Law of the People's Republic of China" and the "Law of the People's Republic of China on Earthquake Prevention and Disaster Mitigation", the principle of "prevention first" is implemented, and the building's water supply and drainage, heating, ventilation, air conditioning, gas, heat, electricity, This specification is formulated for communication, fire protection and other mechanical and electrical projects, after seismic fortification, to reduce earthquake damage, prevent secondary disasters, avoid casualties, reduce economic losses, and achieve safety, reliability, advanced technology, reasonable economy, and convenient maintenance and management.
1.0.2 This specification is applicable to the seismic design of building electromechanical engineering with seismic fortification intensity of 6 to 9 degrees, and not applicable to the seismic design of building electromechanical engineering with seismic fortification intensity greater than 9 degrees or with special requirements.
1.0.3 The seismic design of building mechanical and electrical engineering facilities according to this specification shall meet the following requirements.
1 When subjected to frequent earthquakes that are lower than the seismic fortification intensity of the local area, the mechanical and electrical engineering facilities are generally not damaged or can continue to operate without repairs;
2 When affected by an earthquake equivalent to the seismic fortification intensity of this area, the mechanical and electrical engineering facilities may be damaged and can continue to operate after general repairs or without repairs;
3 When affected by a rare earthquake that is higher than the seismic fortification intensity in this area, the mechanical and electrical engineering facilities will not be severely damaged and life-threatening.
1.0.4 Seismic design must be carried out for mechanical and electrical engineering of buildings in areas with seismic fortification intensity of 6 degrees and above
1.0.5 For the mechanical and electrical engineering of buildings located in areas with seismic fortification intensity of 6 degrees and other than Class A buildings, earthquake action calculations may not be performed.
Note. In the following articles of this code, the expression "seismic fortification intensity" is generally omitted, and "seismic fortification intensity is 6 degrees, 7 degrees, 8 degrees, 9 degrees" is referred to as "6 degrees, 7 degrees, 8 degrees, 9 degrees".
1.0.6 The seismic design of building mechanical and electrical engineering shall not only comply with this code, but also comply with the current relevant national standards.
2 Terminology and symbols
2.1 Terminology
2.1.1 Seismic precautionary intensity
The seismic intensity approved as the basis for an area's seismic fortification according to the authority stipulated by the state. In general, the seismic intensity is taken to exceed the probability of 10% within 50 years.
2.1.2 Seismic precautionary criterion
The scale to measure the level of seismic fortification requirements is determined by the seismic fortification intensity or design ground motion parameters and the building's seismic fortification category.
2.1.3 earthquake action
Structural dynamic action caused by ground motion, including horizontal earthquake action and vertical earthquake action.
2.1.4 building mechanical and electrical equipment engineering facilities
Ancillary machinery, electrical components, components and systems that serve building functions. It mainly includes elevators, lighting systems and emergency power supplies, communication equipment, piping systems, heating and air conditioning systems, fire alarm and fire fighting systems, shared antennas, etc.
2.1.5 Seismic support
A member consisting of anchors, reinforced suspenders, diagonal braces and seismic connection members.
2.1.6 seismic bracing
It is an anti-seismic support facility that is firmly connected with the building structure and takes earthquake force as the main load. It consists of anchors, reinforced suspenders, anti-seismic connecting members and anti-seismic braces.
2.1.7 Lateral seismic bracing
An anti-seismic hanger with diagonal braces parallel to the cross-section of the pipe.
2.1.8 Longitudinal seismic bracing
The anti-seismic support and hanger with diagonal braces perpendicular to the cross section of the pipe.
2.1.9 single tube seismic bracing
An anti-seismic support and hanger composed of a load-bearing hanger and anti-seismic diagonal braces.
2.1.10 door-shaped seismic bracing
An anti-seismic support and hanger composed of two or more load-bearing hangers, beams, and anti-seismic diagonal braces.
2.1.11 Design basic acceleration of ground motion
The design value of the seismic acceleration with a probability of exceeding 10% in the 50-year design base period.
2.1.12 design characteristic period of ground motion
In the seismic influence coefficient curve used for seismic design, the period value corresponding to the starting point of the descending section reflects factors such as earthquake magnitude, epicentral distance and site type.
2.2 Symbols
2.2.1 Actions and action effects
F—the standard value of horizontal seismic action applied at the center of gravity of the mechanical and electrical engineering facilities along the most unfavorable direction;
G—gravity of non-structural components;
SGE - the effect of the representative value of the gravity load;
SEhk—the effect of the standard value of horizontal seismic action;
S——Design value of internal force combination of mechanical and electrical engineering facilities or components.
2.2.2 Resistance and material properties
R—design value of member bearing capacity;
[θe] — limit value of displacement angle between elastic layers;
βs——floor response spectrum value of building mechanical and electrical engineering facilities or components.
2.2.3 Geometric parameters
h—calculated floor height;
l—the lateral and longitudinal seismic support hanger spacing of the horizontal pipeline;
l0——The maximum spacing of seismic supports and hangers;
L——the distance from the next longitudinal seismic support and hanger;
L1——longitudinal seismic support hanger spacing;
L2—Space of lateral seismic supports and hangers.
2.2.4 Calculation coefficients
γ——function coefficient of non-structural component;
η—coefficient of category of non-structural components;
ξ1——state coefficient;
ξ2——Position coefficient;
αmax——maximum value of seismic influence coefficient;
γG—subitem coefficient of gravity load;
γEh—sub-item coefficient of horizontal earthquake action;
αEk—horizontal seismic force comprehensive coefficient;
k——Angle adjustment coefficient of anti-seismic bracing.
3 basic design requirements
3.1 General provisions
3.1.1 The anti-seismic measures for the connecting components and parts of building mechanical and electrical engineering facilities and building structures shall be based on fortification intensity, building use function, building height, structure type, deformation characteristics, location and operation requirements of equipment and facilities, and the current national standard "Building The relevant provisions of GB 50011 Code for Seismic Design are determined after comprehensive analysis.
3.1.2 Important machine rooms for building mechanical and electrical engineering should not be located in places with weak anti-seismic performance; for equipment with vibration isolation devices, when strong vibration occurs, the connecting parts should not be damaged, and resonance between equipment and building structures should be prevented.
3.1.3 The supports and hangers of building mechanical and electrical engineering facilities shall have sufficient rigidity and bearing capacity, and the supports and hangers shall be reliably connected and anchored to the building structure.
3.1.4 The construction mechanical and electrical engineering pipelines shall be installed through the openings of the structural walls, and shall try to avoid passing through the main load-bearing structural components. The connection between pipes and equipment and building structure should be able to allow a certain relative displacement between the two.
3.1.5 The foundations or connectors of building mechanical and electrical engineering facilities shall be able to transfer all the seismic action borne by the equipment to the building structure. The embedded parts and anchors used to fix the building's mechanical and electrical engineering facilities in the building structure should be able to withstand the earthquake action transmitted to the main structure by the building's mechanical and electrical engineering facilities.
3.1.6 The seismic design of building mechanical and electrical engineering facilities should be based on the building structure design, and measures should be taken to fortify the connecting parts with the building structure. For the equipment whose gravity is not greater than 1.8kN or the suspending pipe with the calculated length of the suspender not greater than 300mm, fortification may not be required.
3.1.7 The seismic support and hanger shall be connected with the reinforced concrete structure by anchor bolts, and shall be connected with the steel structure by welding or bolts.
3.1.8 The mechanical and electrical engineering pipelines of the building passing through the isolation layer shall adopt flexible connections or other methods, and anti-seismic supports shall be provided on both sides of the isolation layer.
3.1.9 The bottom of building mechanical and electrical engineering facilities should be firmly fixed to the ground. For the seismic fortification of Intensity 8 and above, expansion bolts or bolts shall be fixed on the structural floor under the cushion. For construction mechanical and electrical engineering facilities that cannot be connected to the ground with bolts, L-type anti-seismic anti-skid angle irons should be used for limit.
3.2 Site impact
3.2.1 When the construction site is Class I, the construction mechanical and electrical engineering of Class A and B buildings shall adopt seismic structural measures according to the requirements of the local seismic fortification intensity; the construction mechanical and electrical engineering of Class C buildings may be reduced by one degree according to the local seismic fortification intensity It is required to take anti-seismic structural measures, but when the degree is 6, the anti-seismic structural measures should still be taken according to the requirements of the seismic fortification intensity in this area.
3.2.2 When the construction sites are in categories III and IV, for areas where the design basic seismic acceleration is 0.15g and 0.30g, various types of building mechanical and electrical engineering should be adopted according to the requirements of degrees 8 (0.20g) and 9 degrees (0.40g) respectively. Earthquake-resistant construction measures.
2.The earthquake effect caused by the gravity of the building's own gravity can be calculated by the equivalent lateral force method; for the building's The effect of relative displacement between points;
3 When the system natural vibration period of building electromechanical equipment (including supports) is greater than 0.1s, and its gravity is greater than 1% of the gravity of the floor where it is located, or the gravity of building electromechanical equipment is greater than 10% of the gravity of the floor where it is located, it is advisable to enter the overall structural model for earthquake resistance The calculation can also be calculated by the floor response spectrum method. Among them, for the equipment connected inelastically with the floor, the equipment and the floor can be directly included in the analysis of the whole structure as a mass point to obtain the earthquake action suffered by the equipment.
3.4.5 When the equivalent lateral force method is adopted, the standard value of horizontal earthquake action should be calculated according to the following formula.
In the formula. F—the standard value of horizontal seismic action applied to the center of gravity of the mechanical and electrical engineering facilities along the most unfavorable direction;
γ——function coefficient of non-structural components, to be implemented in accordance with Article 3.4.1 of this code;
η—coefficient of category of non-structural components, to be implemented in accordance with Article 3.4.1 of this code;
ξ1——state coefficient; 2.0 should be taken for any equipment and flexible system whose support point is lower than the center of mass, and 1.0 for other cases;
ξ2——Position coefficient, the apex of the building should be taken as 2.0, the bottom should be taken as 1.0, and distributed linearly along the height; for buildings that require supplementary calculation by the time history analysis method for the structure, it should be adjusted according to the calculation result;
αmax——the maximum value of the earthquake influence coefficient; it can be adopted according to the provisions of frequent earthquakes in Article 3.3.5 of this code;
G——Gravity of non-structural components, which should include the gravity of relevant personnel, medium in containers and pipelines and objects in lockers during operation.
3.4.6 The internal force generated by building mechanical and electrical engineering facilities or components due to the relative horizontal displacement of the supporting point can be calculated by multiplying the stiffness of the component in the displacement direction by the specified relative elastic horizontal displacement of the supporting point, and shall meet the following requirements.
1 For the stiffness of building mechanical and electrical engineering facilities or components in the direction of displacement, simplified mechanical models such as rigid connection, hinge connection, elastic connection or sliding connection should be adopted respectively according to the actual connection state of the ends;
2 The relative horizontal displacement on both sides of the segmental seismic joint should be determined according to the application requirements; the relative elastic horizontal displacement △u of adjacent floors should be calculated according to the following formula.
In the formula. [θe] — limit value of displacement angle between elastic layers, which should be adopted according to Table 3.4.6;
h——calculated floor height (m).
Table 3.4.6 Limits of displacement angle between elastic stories
3.4.7 When the floor response spectrum method is adopted, the standard value of horizontal seismic action of building mechanical and electrical engineering facilities or components should be calculated according to the following formula.
In the formula. βs——floor response spectrum value of building mechanical and electrical engineering facilities or components.
3.5 Seismic Requirements for Building Mechanical and Electrical Engineering Facilities and Supports and Hangers
3.5.1 The basic combination of the earthquake action effect (including the effect caused by its own gravity and the effect caused by the relative displacement of the support) and other load effects of the mechanical and electrical engineering facilities of the building shall be calculated according to the following formula.
In the formula. S——Design value of internal force combination of mechanical and electrical engineering facilities or components, including combined design value of bending moment, axial force and shear force;
γG——sub-item coefficient of gravity load, generally 1.2;
γEh—sub-item coefficient of horizontal earthquake action, take 1.3;
SGE - the effect of the representative value of the gravity load;
SEhk—the effect of the standard value of horizontal seismic action.
3.5.2 During the seismic check calculation of building mechanical and electrical engineering facilities, the frictional force shall not be used as the resistance to the earthquake; the seismic adjustment factor of the bearing capacity may be 1.0, and shall meet the requirements of the following formula.
In the formula. R—design value of member bearing capacity.
3.5.3 The high-level water tank in the building shall be reliably connected to the structure. For Intensity 8 and above, the structural design shall consider the additional seismic effect of the high-level water tank on the structural system.
3.5.4 For building mechanical and electrical engineering facilities that need to work continuously under the action of fortification intensity earthquakes, their supports and hangers should be able to ensure the normal operation of the facilities. Corresponding strengthening measures should be taken.
3.5.5 Seismic actions in different directions borne by the mechanical and electrical engineering facilities of buildings that need to be fortified should be borne by seismic supports in different directions, and seismic actions in the horizontal direction should be borne by seismic supports in two different directions.
4 water supply and drainage
4.1 Indoor water supply and drainage
4.1.1 The selection of water supply and drainage pipes shall meet the following requirements.
1 The selection of domestic water supply pipes and hot water pipes shall meet the following requirements.
1) Multi-storey buildings in areas with an intensity of 8 and below should be selected according to the current national standard "Code for Design of Water Supply and Drainage for Buildings" GB 50015;
2) The main pipes and standpipes of high-rise buildings and buildings in 9-degree areas should adopt copper pipes, stainless steel pipes, metal composite pipes and other high-strength and ductile pipes, and the connection methods can be connected by pipe fittings or welded;
2 Soft joints should be installed after the valves of the household pipes of high-rise buildings and buildings in 9-degree areas;
3.The pipe materials and connection methods of fire water supply pipes and gas fire extinguishing pipelines should be selected according to the system working pressure and the relevant fire protection regulations in the current national standards;
4 The selection of sewage and waste water pipes for gravity flow drainage shall meet the following requirements;
1) Multi-storey buildings in areas with an intensity of 8 and below should be selected according to the current national standard "Code for Design of Water Supply and Drainage for Buildings" GB 50015;
3 Fire water supply pipes should be ductile iron pipes, welded steel pipes, hot-dip galvanized steel pipes;
4 Drainage pipes should be made of PVC and PE double-wall corrugated pipes, reinforced concrete pipes or other types of chemical pipes, and the joints of the drainage pipes should be flexible joints; clay pipes and asbestos cement pipes are not allowed; Class III and Class IV sites of 8 degrees or 9 degrees, the pipes should be connected by sockets, and the fillers at the joints should be made of flexible materials;
5 In degrees 7 and 8, where the foundation soil is liquefiable or in areas of degree 9, plastic pipes shall not be used for outdoor buried water supply and drainage pipes. Brick masonry structures and plastic products should not be used for auxiliary structures such as gates and inspection wells on the pipe network.
4.2.3 The layout and laying of pipelines shall meet the following requirements.
1 The layout and laying of domestic water supply and fire-fighting water supply pipelines shall meet the following requirements.
1) The pipeline should be buried or laid in trenches;
2) The pipeline should avoid laying in areas with high ridges, deep pits, collapses and landslides;
3) Buildings and building communities that use the municipal water supply network for water supply should use two-way water supply, and important buildings that cannot be cut off should use two-way water supply, or set up two inlet pipes;
4) The main pipe should be arranged in a ring shape, and valve wells should be reasonably arranged on the ring pipe.
2 The layout and laying of hot water pipelines shall meet the following requirements.
1) Pipelines should be laid by direct burial or pipe trenches, and pipe trenches should be used for 9-degree areas;
2) The pipeline should avoid laying in areas with high ridges, deep pits, collapses and landslides;
3) Anti-seismic and anti-deformation measures should be taken in combination with preventing expansion and deformation of hot water pipes;
4) The insulation material should have good flexibility.
3 The layout and laying of drainage pipes shall meet the following requirements.
1) The drainage pipes of large-scale building areas should be arranged in sections, treated nearby and discharged in a dispersed manner. When conditions permit, additional connecting pipes or emergency discharge outlets should be appropriately added;
2) When connected to the urban municipal drainage pipe network, a certain drop height should be set to prevent water flow from flowing backwards;
3) Drainage pipes should avoid laying in high ridges, deep pits, collapses and landslides.
4.2.4 The setting of the pool shall meet the following requirements.
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