1.0.1 This code was prepared with a view to implementing "Construction Law of the People's Republic of China" and "Law of the People's Republic of China on Protecting Against and Mitigating Earthquake Disasters", pursuing the policy of "Prevention First", reducing seismic damage, preventing secondary disaster, avoiding personal casualty, reducing economic losses, and making mechanical and electrical engineering such as building water supply and drainage, heating, ventilating, air conditioning, gas, heating power, electricity, communication and fire-fighting be safe and reliable, technology-advanced, economically reasonable and convenient for maintenance management after seismic precaution.
1.0.2 This code is applicable to seismic design of building mechanical and electrical engineering with the seismic precautionary intensity from Intensity 6 to Intensity 9 and is not applicable to seismic design of building mechanical and electrical engineering with the seismic precautionary intensity greater than Intensity 9 or that with special requirements.
1.0.3 Seismic design of building mechanical and electrical equipment engineering facilities according to this code shall reach the following requirements:
1 Mechanical and electrical equipment engineering facilities are generally free from damages or may continue operating without repairing in case of frequent earthquakes lower than local seismic precautionary intensity;
2 Mechanical and electrical equipment engineering facilities are possibly damaged and may still continue operating after general repair or without repairing in case of earthquakes equivalent to local seismic precautionary intensity;
3 Mechanical and electrical equipment engineering facilities are unlikely to be badly damaged and endanger lives in case of rare earthquake greater than local seismic precautionary intensity.
1.0.4 Seismic design must be carried out for the building mechanical and electrical engineering in regions with the seismic precautionary intensity of Intensity 6 or above.
1.0.5 Seismic action calculation may not be carried out for building (except Category A building) mechanical and electrical engineering in regions with the seismic precautionary intensity of Intensity 6.
Note: In the following provisions of this code, expressive words "seismic precautionary intensity" a generally omitted, "seismic precautionary intensity of Intensity 6, Intensity 7, Intensity 8 or Intensity 9" are referred to as "Intensity 6, Intensity 7, Intensity 8 or Intensity 9".
1.0.6 Seismic design of building mechanical and electrical engineering shall meet not only the requirements in this code, but also those stipulated in the current relevant standards of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Seismic precautionary intensity
The seismic intensity which is approved according to the authority specified by the nation to act as the criterion of seismic precaution for one region, and generally is the seismic intensity with exceedance probability of 10% in 50 years.
2.1.2 Seismic precautionary criterion
The rule for judging the seismic precautionary requirements, which is determined according to the seismic precautionary intensity or the design parameters of ground motion and the seismic precautionary category of buildings.
2.1.3 Earthquake action
The dynamic action of structure caused by ground motion, including horizontal earthquake action and vertical earthquake action.
2.1.4 Building mechanical and electrical equipment engineering facilities
The accessory machines, electrical components, parts and systems offering service to the use function of buildings, mainly including elevator, lighting system and emergency power supply, communication equipment, pipeline system, heating and air conditioning system, fire alarm and fire-fighting system as well as common antenna, etc.
2.1.5 Seismic support
The component composed of anchorage body, reinforced hanger rod, diagonal bracing and seismic connection component.
2.1.6 Seismic bracing
The seismic support facility firmly connected with building structure, which is with seismic force as the main load and is composed of anchorage body, reinforced hanger rod, seismic connection component and seismic diagonal bracing.
2.1.7 Lateral seismic bracing
The seismic bracing with diagonal bracing parallel to the cross section of pipeline.
2.1.8 Longitudinal seismic bracing
The seismic bracing with diagonal bracing perpendicular to the cross section of pipeline.
2.1.9 Single tube seismic bracing
The seismic bracing composed of a stick of load-bearing hanger and earthquake diagonal bracing.
2.1.10 Door-shaped seismic bracing
The seismic bracing composed of two or more sticks of load-bearing hangers, transverse beams and earthquake diagonal bracing.
2.1.11 Design basic acceleration of ground motion
The design value of seismic acceleration with exceedance probability of during the 50-years design reference period.
2.1.12 Design characteristic period of ground motion
The period value corresponding to the starting point of the descending section reflecting factors such as the earthquake magnitude, epicentral distance and site category in the seismic influence coefficient curve used for seismic design.
2.2 Symbols
2.2.1 Action and effect
F——the characteristic value of horizontal earthquake action imposed on the gravity center of mechanical and electrical equipment engineering facilities along the most unfavorable direction;
G——the gravity of non-structural components;
SGE——the effect of the representative value for gravity load;
SEhk——the effect of the characteristic value of horizontal earthquake action;
S——the design value of mechanical and electrical equipment engineering facility or component internal force combination.
2.2.2 Resistance and material performance
R——the design value of load-carrying capacity of components;
[θe]——the limit of elastic inter-storey drift angle;
βs——the floor response spectrum value of building mechanical and electrical equipment engineering facility or component.
2.2.3 Geometric parameters
h——the calculated storey height;
l——the spacing between lateral and longitudinal seismic bracing for horizontal pipeline;
l0——the maximum spacing of seismic bracing;
L——the distance to the next longitudinal seismic bracing;
L1——the spacing of longitudinal seismic bracing;
L2——the spacing of lateral seismic bracing.
2.2.4 Calculation coefficient
γ——the function coefficient of non-structural components;
η——the category coefficient of non-structural components;
ζ1——the state coefficient;
ζ2——the position coefficient;
αmax——the maximum seismic influence coefficient;
γG——the partial coefficient of gravity load;
γEh——the partial coefficient of horizontal earthquake action;
αEk——the comprehensive coefficient of horizontal seismic force;
k——the angular adjustment coefficient of earthquake bracing.
3 Basic Requirements for Design
3.1 General Requirements
3.1.1 Seismic measures for connection components and parts between building mechanical and electrical equipment engineering facilities and building structures shall be determined according to the precautionary intensity, use function of building, building height, structure type, deformation characteristic, positions and operation requirements of equipment and facilities as well as the relevant requirements of the current national standard "Code for Seismic Design of Buildings" (GB 50011) and after comprehensive analysis.
3.1.2 Important equipment rooms of building mechanical and electrical engineering shall not be arranged at the positions with weak seismic performance; for equipment with vibration isolation device, connection pieces shall not be damaged and resonance phenomenon of equipment and building structure shall be prevented in case of strong vibration.
3.1.3 Brackets and hangers of building mechanical and electrical equipment engineering facilities shall be possessed of sufficient rigidity and load-carrying capacity; reliable connection and anchorage shall be provided for brackets and hangers and building structure.
3.1.4 Opening on structural wall for building mechanical and electrical engineering pipeline shall be such arranged to avoid passing through main bearing structure components. The connection between pipeline and equipment and building structure shall be able to allow certain relative displacement.
3.1.5 Bases and connection pieces of building mechanical and electrical equipment engineering facilities shall be able to transfer all seismic action borne by the equipment to the building structure. In building structure, the embedded parts and anchoring parts used to fix building mechanical and electrical equipment engineering facilities shall be able to bear the seismic action transferred from building mechanical and electrical equipment engineering facilities to the major structure.
3.1.6 Seismic design of building mechanical and electrical equipment engineering facilities shall be based on design of building structure; precautionary measures shall be taken to connection pieces of building structure. Precautionary measures may not be taken to equipment with the gravity not greater than 1.8kN or hanger rod hanging pipeline for hanger rod with calculated length not greater than 300mm.
3.1.7 Seismic brackets and hangers shall be anchored with reinforced concrete structure and shall be welded or bolted with steel structure.
3.1.8 Flexible connection or other connection modes shall be adopted for building mechanical and electrical engineering pipeline crossing seismic isolation storey; and seismic brackets shall be arranged on both sides of seismic isolation storey.
3.1.9 Bottom of building mechanical and electrical equipment engineering facilities shall be firmly fixed to the floor. For seismic precaution of Intensity 8 or above, expansion bolts or bolts shall be fixed on the structural floor slab under cushion. For building mechanical and electrical equipment engineering facilities which cannot be bolted with the floor, L-type seismic anti-skid angle iron shall be adopted for limiting.
3.2 Site Influence
3.2.1 In case of Category I building site, seismic constructional measures for mechanical and electrical engineering of Category A and B buildings shall be taken according to the requirements of local seismic precautionary intensity and those for mechanical and electrical engineering of Category C buildings may be taken according to the requirements for one grade lower than the local seismic precautionary intensity; however, as for Intensity 6, seismic constructional measures shall be taken according to the requirements of the local seismic precautionary intensity.
3.2.2 In case of Category III or IV building site, for the mechanical and electrical engineering of various buildings in regions with the design basic acceleration of ground motion of 0.15g and 0.30g, the seismic constructional measures should be taken according to the requirements for Intensity 8 (0.20g) and Intensity 9 (0.40g) respectively.
3.3 Earthquake Motion Influence
3.3.1 For earthquakes suffered by building mechanical and electrical engineering location region, the seismic precautionary intensity may be selected according to current national standard "Code for Seismic Design of Buildings" (GB 50011), and design basic acceleration of ground motion and design characteristic period of ground motion corresponding to the seismic precautionary intensity may be adopted. For cities with prepared seismic precautionary zoning, the seismic precaution may be carried out according to approved seismic precautionary intensity and corresponding ground motion parameter.
3.3.2 The corresponding relationship between seismic precautionary intensity and value of design basic acceleration of ground motion shall meet those specified in Table 3.3.2. For building mechanical and electrical engineering in regions with the design basic acceleration of ground motion of 0.15g and 0.30g, unless otherwise stipulated in this code, the seismic design shall be carried out according to the requirements for Intensity 7 and Intensity 8 respectively.
Table 3.2.2 Corresponding Relationship between Seismic Precautionary Intensity and Values of Design Basic Acceleration of Ground Motion
Seismic precautionary intensity 6 7 8 9
Value of design basic acceleration of ground motion 0.05g 0.10(0.15)g 0.20(0.30)g 0.40g
Note: g is the gravity acceleration.
3.3.3 Design characteristic period of ground motion for building structure shall be determined according to local design seismic group and site category and its value shall be adopted according to those specified in Table 3.3.3.
Table 3.3.3 Value of Design Characteristic Period of Ground Motion (s)
Design seismic group Site category
I0 I1 II III IV
Group 1 0.20 0.25 0.35 0.45 0.65
Group 2 0.25 0.30 0.40 0.55 0.75
Group 3 0.30 0.35 0.45 0.65 0.90
3.3.4 Seismic precautionary intensity, design basic acceleration of ground motion and design seismic group for central areas of main cities in China may be selected according to the relevant requirements of the current national standard "Code for Seismic Design of Buildings" (GB 50011).
3.3.5 The maximum horizontal seismic influence coefficient of building mechanical and electrical engineering equipment shall be adopted according to those specified in Table 3.3.5; where seismic isolation design is adopted for building structure, the maximum horizontal seismic influence coefficient after seismic isolation shall be adopted.
Table 3.3.5 Maximum Horizontal Seismic Influence Coefficient
Note: the values in parentheses are used for the regions where the design basic acceleration of ground motion is 0.15g and 0.30g respectively.
3.4 Calculation for Seismic Action
3.4.1 Seismic calculation for building mechanical and electrical engineering equipment shall be carried out according to seismic requirements of the building with different coefficients and category coefficients adopted for the positions; the category coefficients and function coefficients for mechanical and electrical equipment components may be determined according to those specified in Table 3.4.1 and shall meet the following requirements:
1 In case of high requirements, the appearance may be damaged, however, the use function and fire protection ability are not affected, it may stand more than 1.4 times the deformation of design deflection for the connected structural components, its function coefficient shall be larger than or equal to 1.4;
2 In case of medium requirements, the use function is basically normal or may be recovered quickly, the fire-resistant time is reduced by 1/4, it may stand the deformation of design deflection for connected structural components, and its function coefficient shall be taken as 1.0;
3 In case of general requirements, many components are basically at original positions, however, the system may be damaged and require repair for function recovery, the fire-resistant time is obviously reduced, it may only stand 0.6 times the deformation of design deflection for connected structural components, and its function coefficient shall be taken as 0.6.
1 General Provisions 2 Terms and Symbols 2.1 Terms 2.2 Symbols 3 Basic Requirements for Design 3.1 General Requirements 3.2 Site Influence 3.3 Earthquake Motion Influence 3.4 Calculation for Seismic Action 3.5 Aseismic Requirements for Building Mechanical and Electrical Equipment Engineering Facilities and Bracing 4 Water Supply and Drainage 4.1 Indoor Water Supply and Water Drainage 4.2 Outdoor Water Supply and Drainage of Building Quarters and Individual Buildings 5 HVAC 5.1 Heating, Ventilation and Air Conditioning Systems 5.2 Outdoor Thermal System 6 Gas 6.1 General Requirements 6.2 Gas System 7 Building Electricity 7.1 General Requirements 7.2 Settings of System and Equipment 7.3 Location Options of Engine Rooms 7.4 Equipment Installation 7.5 Conductor Selection and Line Laying 8 Seismic Bracing 8.1 General Requirements 8.2 Calculation for Seismic Bracing 8.3 Design for Seismic Bracing Explanation of Wording in this Code List of Quoted Standards
1 General Provisions
1.0.1 This code was prepared with a view to implementing "Construction Law of the People's Republic of China" and "Law of the People's Republic of China on Protecting Against and Mitigating Earthquake Disasters", pursuing the policy of "Prevention First", reducing seismic damage, preventing secondary disaster, avoiding personal casualty, reducing economic losses, and making mechanical and electrical engineering such as building water supply and drainage, heating, ventilating, air conditioning, gas, heating power, electricity, communication and fire-fighting be safe and reliable, technology-advanced, economically reasonable and convenient for maintenance management after seismic precaution.
1.0.2 This code is applicable to seismic design of building mechanical and electrical engineering with the seismic precautionary intensity from Intensity 6 to Intensity 9 and is not applicable to seismic design of building mechanical and electrical engineering with the seismic precautionary intensity greater than Intensity 9 or that with special requirements.
1.0.3 Seismic design of building mechanical and electrical equipment engineering facilities according to this code shall reach the following requirements:
1 Mechanical and electrical equipment engineering facilities are generally free from damages or may continue operating without repairing in case of frequent earthquakes lower than local seismic precautionary intensity;
2 Mechanical and electrical equipment engineering facilities are possibly damaged and may still continue operating after general repair or without repairing in case of earthquakes equivalent to local seismic precautionary intensity;
3 Mechanical and electrical equipment engineering facilities are unlikely to be badly damaged and endanger lives in case of rare earthquake greater than local seismic precautionary intensity.
1.0.4 Seismic design must be carried out for the building mechanical and electrical engineering in regions with the seismic precautionary intensity of Intensity 6 or above.
1.0.5 Seismic action calculation may not be carried out for building (except Category A building) mechanical and electrical engineering in regions with the seismic precautionary intensity of Intensity 6.
Note: In the following provisions of this code, expressive words "seismic precautionary intensity" a generally omitted, "seismic precautionary intensity of Intensity 6, Intensity 7, Intensity 8 or Intensity 9" are referred to as "Intensity 6, Intensity 7, Intensity 8 or Intensity 9".
1.0.6 Seismic design of building mechanical and electrical engineering shall meet not only the requirements in this code, but also those stipulated in the current relevant standards of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Seismic precautionary intensity
The seismic intensity which is approved according to the authority specified by the nation to act as the criterion of seismic precaution for one region, and generally is the seismic intensity with exceedance probability of 10% in 50 years.
2.1.2 Seismic precautionary criterion
The rule for judging the seismic precautionary requirements, which is determined according to the seismic precautionary intensity or the design parameters of ground motion and the seismic precautionary category of buildings.
2.1.3 Earthquake action
The dynamic action of structure caused by ground motion, including horizontal earthquake action and vertical earthquake action.
2.1.4 Building mechanical and electrical equipment engineering facilities
The accessory machines, electrical components, parts and systems offering service to the use function of buildings, mainly including elevator, lighting system and emergency power supply, communication equipment, pipeline system, heating and air conditioning system, fire alarm and fire-fighting system as well as common antenna, etc.
2.1.5 Seismic support
The component composed of anchorage body, reinforced hanger rod, diagonal bracing and seismic connection component.
2.1.6 Seismic bracing
The seismic support facility firmly connected with building structure, which is with seismic force as the main load and is composed of anchorage body, reinforced hanger rod, seismic connection component and seismic diagonal bracing.
2.1.7 Lateral seismic bracing
The seismic bracing with diagonal bracing parallel to the cross section of pipeline.
2.1.8 Longitudinal seismic bracing
The seismic bracing with diagonal bracing perpendicular to the cross section of pipeline.
2.1.9 Single tube seismic bracing
The seismic bracing composed of a stick of load-bearing hanger and earthquake diagonal bracing.
2.1.10 Door-shaped seismic bracing
The seismic bracing composed of two or more sticks of load-bearing hangers, transverse beams and earthquake diagonal bracing.
2.1.11 Design basic acceleration of ground motion
The design value of seismic acceleration with exceedance probability of during the 50-years design reference period.
2.1.12 Design characteristic period of ground motion
The period value corresponding to the starting point of the descending section reflecting factors such as the earthquake magnitude, epicentral distance and site category in the seismic influence coefficient curve used for seismic design.
2.2 Symbols
2.2.1 Action and effect
F——the characteristic value of horizontal earthquake action imposed on the gravity center of mechanical and electrical equipment engineering facilities along the most unfavorable direction;
G——the gravity of non-structural components;
SGE——the effect of the representative value for gravity load;
SEhk——the effect of the characteristic value of horizontal earthquake action;
S——the design value of mechanical and electrical equipment engineering facility or component internal force combination.
2.2.2 Resistance and material performance
R——the design value of load-carrying capacity of components;
[θe]——the limit of elastic inter-storey drift angle;
βs——the floor response spectrum value of building mechanical and electrical equipment engineering facility or component.
2.2.3 Geometric parameters
h——the calculated storey height;
l——the spacing between lateral and longitudinal seismic bracing for horizontal pipeline;
l0——the maximum spacing of seismic bracing;
L——the distance to the next longitudinal seismic bracing;
L1——the spacing of longitudinal seismic bracing;
L2——the spacing of lateral seismic bracing.
2.2.4 Calculation coefficient
γ——the function coefficient of non-structural components;
η——the category coefficient of non-structural components;
ζ1——the state coefficient;
ζ2——the position coefficient;
αmax——the maximum seismic influence coefficient;
γG——the partial coefficient of gravity load;
γEh——the partial coefficient of horizontal earthquake action;
αEk——the comprehensive coefficient of horizontal seismic force;
k——the angular adjustment coefficient of earthquake bracing.
3 Basic Requirements for Design
3.1 General Requirements
3.1.1 Seismic measures for connection components and parts between building mechanical and electrical equipment engineering facilities and building structures shall be determined according to the precautionary intensity, use function of building, building height, structure type, deformation characteristic, positions and operation requirements of equipment and facilities as well as the relevant requirements of the current national standard "Code for Seismic Design of Buildings" (GB 50011) and after comprehensive analysis.
3.1.2 Important equipment rooms of building mechanical and electrical engineering shall not be arranged at the positions with weak seismic performance; for equipment with vibration isolation device, connection pieces shall not be damaged and resonance phenomenon of equipment and building structure shall be prevented in case of strong vibration.
3.1.3 Brackets and hangers of building mechanical and electrical equipment engineering facilities shall be possessed of sufficient rigidity and load-carrying capacity; reliable connection and anchorage shall be provided for brackets and hangers and building structure.
3.1.4 Opening on structural wall for building mechanical and electrical engineering pipeline shall be such arranged to avoid passing through main bearing structure components. The connection between pipeline and equipment and building structure shall be able to allow certain relative displacement.
3.1.5 Bases and connection pieces of building mechanical and electrical equipment engineering facilities shall be able to transfer all seismic action borne by the equipment to the building structure. In building structure, the embedded parts and anchoring parts used to fix building mechanical and electrical equipment engineering facilities shall be able to bear the seismic action transferred from building mechanical and electrical equipment engineering facilities to the major structure.
3.1.6 Seismic design of building mechanical and electrical equipment engineering facilities shall be based on design of building structure; precautionary measures shall be taken to connection pieces of building structure. Precautionary measures may not be taken to equipment with the gravity not greater than 1.8kN or hanger rod hanging pipeline for hanger rod with calculated length not greater than 300mm.
3.1.7 Seismic brackets and hangers shall be anchored with reinforced concrete structure and shall be welded or bolted with steel structure.
3.1.8 Flexible connection or other connection modes shall be adopted for building mechanical and electrical engineering pipeline crossing seismic isolation storey; and seismic brackets shall be arranged on both sides of seismic isolation storey.
3.1.9 Bottom of building mechanical and electrical equipment engineering facilities shall be firmly fixed to the floor. For seismic precaution of Intensity 8 or above, expansion bolts or bolts shall be fixed on the structural floor slab under cushion. For building mechanical and electrical equipment engineering facilities which cannot be bolted with the floor, L-type seismic anti-skid angle iron shall be adopted for limiting.
3.2 Site Influence
3.2.1 In case of Category I building site, seismic constructional measures for mechanical and electrical engineering of Category A and B buildings shall be taken according to the requirements of local seismic precautionary intensity and those for mechanical and electrical engineering of Category C buildings may be taken according to the requirements for one grade lower than the local seismic precautionary intensity; however, as for Intensity 6, seismic constructional measures shall be taken according to the requirements of the local seismic precautionary intensity.
3.2.2 In case of Category III or IV building site, for the mechanical and electrical engineering of various buildings in regions with the design basic acceleration of ground motion of 0.15g and 0.30g, the seismic constructional measures should be taken according to the requirements for Intensity 8 (0.20g) and Intensity 9 (0.40g) respectively.
3.3 Earthquake Motion Influence
3.3.1 For earthquakes suffered by building mechanical and electrical engineering location region, the seismic precautionary intensity may be selected according to current national standard "Code for Seismic Design of Buildings" (GB 50011), and design basic acceleration of ground motion and design characteristic period of ground motion corresponding to the seismic precautionary intensity may be adopted. For cities with prepared seismic precautionary zoning, the seismic precaution may be carried out according to approved seismic precautionary intensity and corresponding ground motion parameter.
3.3.2 The corresponding relationship between seismic precautionary intensity and value of design basic acceleration of ground motion shall meet those specified in Table 3.3.2. For building mechanical and electrical engineering in regions with the design basic acceleration of ground motion of 0.15g and 0.30g, unless otherwise stipulated in this code, the seismic design shall be carried out according to the requirements for Intensity 7 and Intensity 8 respectively.
Table 3.2.2 Corresponding Relationship between Seismic Precautionary Intensity and Values of Design Basic Acceleration of Ground Motion
Seismic precautionary intensity 6 7 8 9
Value of design basic acceleration of ground motion 0.05g 0.10(0.15)g 0.20(0.30)g 0.40g
Note: g is the gravity acceleration.
3.3.3 Design characteristic period of ground motion for building structure shall be determined according to local design seismic group and site category and its value shall be adopted according to those specified in Table 3.3.3.
Table 3.3.3 Value of Design Characteristic Period of Ground Motion (s)
Design seismic group Site category
I0 I1 II III IV
Group 1 0.20 0.25 0.35 0.45 0.65
Group 2 0.25 0.30 0.40 0.55 0.75
Group 3 0.30 0.35 0.45 0.65 0.90
3.3.4 Seismic precautionary intensity, design basic acceleration of ground motion and design seismic group for central areas of main cities in China may be selected according to the relevant requirements of the current national standard "Code for Seismic Design of Buildings" (GB 50011).
3.3.5 The maximum horizontal seismic influence coefficient of building mechanical and electrical engineering equipment shall be adopted according to those specified in Table 3.3.5; where seismic isolation design is adopted for building structure, the maximum horizontal seismic influence coefficient after seismic isolation shall be adopted.
Table 3.3.5 Maximum Horizontal Seismic Influence Coefficient
Earthquake effect Intensity 6 Intensity 7 Intensity 8 Intensity 9
Frequent earthquakes 0.04 0.08(0.12) 0.16(0.24) 0.32
Rare earthquake 0.28 0.50(0.72) 0.90(1.20) 1.40
Note: the values in parentheses are used for the regions where the design basic acceleration of ground motion is 0.15g and 0.30g respectively.
3.4 Calculation for Seismic Action
3.4.1 Seismic calculation for building mechanical and electrical engineering equipment shall be carried out according to seismic requirements of the building with different coefficients and category coefficients adopted for the positions; the category coefficients and function coefficients for mechanical and electrical equipment components may be determined according to those specified in Table 3.4.1 and shall meet the following requirements:
1 In case of high requirements, the appearance may be damaged, however, the use function and fire protection ability are not affected, it may stand more than 1.4 times the deformation of design deflection for the connected structural components, its function coefficient shall be larger than or equal to 1.4;
2 In case of medium requirements, the use function is basically normal or may be recovered quickly, the fire-resistant time is reduced by 1/4, it may stand the deformation of design deflection for connected structural components, and its function coefficient shall be taken as 1.0;
3 In case of general requirements, many components are basically at original positions, however, the system may be damaged and require repair for function recovery, the fire-resistant time is obviously reduced, it may only stand 0.6 times the deformation of design deflection for connected structural components, and its function coefficient shall be taken as 0.6.
Contents of GB 50981-2014
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirements for Design
3.1 General Requirements
3.2 Site Influence
3.3 Earthquake Motion Influence
3.4 Calculation for Seismic Action
3.5 Aseismic Requirements for Building Mechanical and Electrical Equipment Engineering Facilities and Bracing
4 Water Supply and Drainage
4.1 Indoor Water Supply and Water Drainage
4.2 Outdoor Water Supply and Drainage of Building Quarters and Individual Buildings
5 HVAC
5.1 Heating, Ventilation and Air Conditioning Systems
5.2 Outdoor Thermal System
6 Gas
6.1 General Requirements
6.2 Gas System
7 Building Electricity
7.1 General Requirements
7.2 Settings of System and Equipment
7.3 Location Options of Engine Rooms
7.4 Equipment Installation
7.5 Conductor Selection and Line Laying
8 Seismic Bracing
8.1 General Requirements
8.2 Calculation for Seismic Bracing
8.3 Design for Seismic Bracing
Explanation of Wording in this Code
List of Quoted Standards
