1 General Provisions
1.0.2 The purpose is to control the earthquake damage to such important mechanical and electrical equipment as fire-fighting system, emergency communication system, power backup system, and gas supply system within the local scale, and to avoid secondary disaster.
1.0.4 This clause is mandatory. In the current national standard GB 50011-2010 Code for Seismic Design of Buildings, Clause 1.0.2 "Seismic design must be carried out for the buildings in regions with the seismic precautionary intensity being 6 or above" and Clause 3.7.1 "The connection of structural components, including the nonstructural components and the auxiliary mechanical and electrical components of buildings, and the connection between the nonstructural component and the main structure shall be subject to seismic design." are mandatory. Therefore, this clause is taken as mandatory requirement, so that the mechanical and electrical equipment of building keeps consistent with the building.
The seismic design for mechanical and electrical equipment of building shall include seismic action calculation, seismic checking for sections of the support, connectors or anchors, as well as the corresponding seismic measures employed according to this code, but the seismic design of equipment is not included.
1.0.5 The common Category A and Category B buildings are sorted out according to the current national standard GB 50223 Standard for Classification of Seismic Protection of Buildings, basically, the remaining buildings may be subject to seismic fortification according to Category C buildings. The seismic fortification categories of buildings shall be classified into Category A, Category B, Category C, and Category D, based on the importance of the service functions.
Category A buildings are those of great significance and possibly causing severe secondary disasters in earthquake; Category B buildings are those with service functions not interruptible or to be recovered as soon as possible in earthquake; Category C buildings are those not belonging to Category A, Category B or Category D; Category D buildings are secondary earthquake-resistant buildings. Category A buildings causes enormous social impact or economic loss after seismic damage. Severe secondary disasters refer to those possibly causing flood, fire, explosion, leakage of toxic or strongly corrosive substances, or other severe secondary disasters after seismic damage. Category B buildings cause great social impact or economic losses after seismic damage, including the significant lifeline engineering in a city, multi-storey large public buildings with thick stream of people, etc. The impact caused by the seismic damage to Category D buildings is inferior to Categories A, B and C buildings, and results in less social impact and economic loss. In general, they are single-storey warehouses storing low-value articles, with less personnel activity frequency, and causing no secondary disasters.
All seismic measures and seismic checking must be carried out for the mechanical and electrical equipment of Category A buildings in Intensity 6 region and buildings in Intensity 7~9 region. For the mechanical and electrical equipment of buildings below Category A in Intensity 6 region, the seismic measures specified in corresponding clauses shall be carried out, while the seismic checking may be omitted.
2 Terms and Symbols
2.1 Terms
2.1.6 Seismic bracing is important seismic measure which provides effective protection to the mechanical and electrical equipment and pipes. As shown in Figure 1, it consists of anchor, reinforced hanger rod, structure connecting component (see Figure 2), and bracing component.
1—long screw; 2—equipment or pipe; 3—screw fastener; 4—C-shaped channel steel;
5—rapid structure connecting component; 6—structure connecting component
Figure 1 Seismic Bracing
2.1.7 The lateral seismic bracing (see Figure 3) is used to defend against the lateral horizontal seismic force.
2.1.8 Longitudinal seismic bracing (see Figure 4) is used to defend against the longitudinal horizontal seismic force.
2.1.9 Single tube seismic bracing (see Figure 5) consists of a load-bearing hanger and bracing component.
2.1.10 Door-shaped seismic bracing (see Figure 6) consists of two or more load-bearing hangers, cross beam and bracing component.
(a) Elevation (b) Plan (c) Isometric view
(a) Elevation (b) Plan (c) Isometric view
1—seam; 2—bolt
Figure 2 Structure Connecting Component
1—diagonal bracing; 2—structure connecting component; 3—anchor;
4—screw fastener; 5—load-bearing hanger rod; 6—pipe
Figure 3 Lateral Seismic Bracing
1—diagonal bracing; 2—structure connecting component; 3—anchor; 4—screw fastener; 5—load-bearing hanger rod; 6—pipe
Figure 4 Longitudinal Seismic Bracing
1—screw fastener; 2—dedicated channel steel; 3—pipe or device
Figure 5 Single Tube Seismic Bracing
1—structure; 2—long nut; 3—long screw; 4—square gasket;
5—channel steel fastener; 6—expansion bolt; 7—seismic connection component;
8—channel steel; 9—rapid structure connecting component
Figure 6 Door-shaped Lateral Seismic Bracing
3 Basic Requirements for Design
3.1 General Requirements
3.1.2 This clause specifies the arrangement of important equipment rooms of mechanical and electrical equipment. The important equipment rooms refer to fire pump room, domestic water pump room, boiler room, refrigerator room, heat exchange station, distribution substation, diesel generator room, communication room, fire control room, security monitoring room, etc.
3.1.6 This clause specifies the equipment needing no seismic fortification. The equipment greater than 1.8kN and needing seismic fortification shall include:
1 The equipment with gravity greater than 1.8kN for hanging pipe;
2 Domestic water pipe system and fire-fighting pipe system above DN65;
3 Duct system with rectangular section area greater than or equal to 0.38 m2 and circular diameter greater than or equal to 0.7m .
4 Electrical pipe with inner diameter greater than or equal to 60mm, as well as cable ladder, cable tray, and busway with gravity greater than or equal to 150N/m.
3.1.7 See Figures 7~13 for the root structure of seismic bracing, reinforced concrete structure and steel structure:
1—screw connector ; 2—anchor bolt; 3—C-shaped channel steel; 4—square gasket
Figure 7 Root Structure of Hanger Rod (Reinforced Concrete Structure)
1—structure connecting component; 2—anchor bolt; 3—bolt; 4—c-shaped channel steel
Figure 8 Root Structure of Structure Connecting Component (Reinforced Concrete Structure)
1—full-weld connection; 2—u-shaped connecting component
Figure 9 Root Structure of Hanger Rod for Steel Beam (Steel Structure)
1—welding; 2—screw; 3—reinforced c-shaped channel steel
Figure 10 Root Structure of Hanger Rod for C-Shaped Channel Steel (Steel Structure)
1—welding; 2—structure connecting component; 3—reinforced c-shaped channel steel
Figure 11 Root Structure of Structure Connecting Component Used for C-shaped Channel Steel (Steel Structure)
1—structure connecting component
Figure 12 Root Anchorage Structure of Structure Connecting Component Used for Steel Beam (Steel Structure)
1—structure connecting component
Figure 13 Root Welding Structure of Structure Connecting Component Used for Steel Beam (Steel Structure)
3.1.8 Flexible connection or other connection modes (if the gas pipe passes through the seismic isolation layer, the valve and stop valve shall be set outdoors, and earthquake sensor shall be equipped) shall be adopted for mechanical and electrical equipment pipes which pass through the seismic isolation layer, so as to adapt to the horizontal displacement of seismic isolation layer under seismic action; and seismic support shall be arranged on both sides of seismic isolation layer.
3.1.9 Where the expansion bolt or bolt is used at the bottom of building mechanical and electrical equipment engineering facilities to fix with the structural slab, the specification and size of the anchor bolt shall be determined through calculation based on the tensile force and shear force it bears. See Figure 14 for the calculation diagram.
1 General Provisions
2 Terms and Symbols
2.1 Terms
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
6.2 Gas System
7 Building Electricity
7.1 General Requirements
7.2 Settings of System and Equipment
7.4 Equipment Installation
7.5 Conductor Selection and Line Laying
8 Seismic Bracing
8.2 Calculation for Seismic Bracing
8.3 Design for Seismic Bracing
1 General Provisions
1.0.2 The purpose is to control the earthquake damage to such important mechanical and electrical equipment as fire-fighting system, emergency communication system, power backup system, and gas supply system within the local scale, and to avoid secondary disaster.
1.0.4 This clause is mandatory. In the current national standard GB 50011-2010 Code for Seismic Design of Buildings, Clause 1.0.2 "Seismic design must be carried out for the buildings in regions with the seismic precautionary intensity being 6 or above" and Clause 3.7.1 "The connection of structural components, including the nonstructural components and the auxiliary mechanical and electrical components of buildings, and the connection between the nonstructural component and the main structure shall be subject to seismic design." are mandatory. Therefore, this clause is taken as mandatory requirement, so that the mechanical and electrical equipment of building keeps consistent with the building.
The seismic design for mechanical and electrical equipment of building shall include seismic action calculation, seismic checking for sections of the support, connectors or anchors, as well as the corresponding seismic measures employed according to this code, but the seismic design of equipment is not included.
1.0.5 The common Category A and Category B buildings are sorted out according to the current national standard GB 50223 Standard for Classification of Seismic Protection of Buildings, basically, the remaining buildings may be subject to seismic fortification according to Category C buildings. The seismic fortification categories of buildings shall be classified into Category A, Category B, Category C, and Category D, based on the importance of the service functions.
Category A buildings are those of great significance and possibly causing severe secondary disasters in earthquake; Category B buildings are those with service functions not interruptible or to be recovered as soon as possible in earthquake; Category C buildings are those not belonging to Category A, Category B or Category D; Category D buildings are secondary earthquake-resistant buildings. Category A buildings causes enormous social impact or economic loss after seismic damage. Severe secondary disasters refer to those possibly causing flood, fire, explosion, leakage of toxic or strongly corrosive substances, or other severe secondary disasters after seismic damage. Category B buildings cause great social impact or economic losses after seismic damage, including the significant lifeline engineering in a city, multi-storey large public buildings with thick stream of people, etc. The impact caused by the seismic damage to Category D buildings is inferior to Categories A, B and C buildings, and results in less social impact and economic loss. In general, they are single-storey warehouses storing low-value articles, with less personnel activity frequency, and causing no secondary disasters.
All seismic measures and seismic checking must be carried out for the mechanical and electrical equipment of Category A buildings in Intensity 6 region and buildings in Intensity 7~9 region. For the mechanical and electrical equipment of buildings below Category A in Intensity 6 region, the seismic measures specified in corresponding clauses shall be carried out, while the seismic checking may be omitted.
2 Terms and Symbols
2.1 Terms
2.1.6 Seismic bracing is important seismic measure which provides effective protection to the mechanical and electrical equipment and pipes. As shown in Figure 1, it consists of anchor, reinforced hanger rod, structure connecting component (see Figure 2), and bracing component.
1—long screw; 2—equipment or pipe; 3—screw fastener; 4—C-shaped channel steel;
5—rapid structure connecting component; 6—structure connecting component
Figure 1 Seismic Bracing
2.1.7 The lateral seismic bracing (see Figure 3) is used to defend against the lateral horizontal seismic force.
2.1.8 Longitudinal seismic bracing (see Figure 4) is used to defend against the longitudinal horizontal seismic force.
2.1.9 Single tube seismic bracing (see Figure 5) consists of a load-bearing hanger and bracing component.
2.1.10 Door-shaped seismic bracing (see Figure 6) consists of two or more load-bearing hangers, cross beam and bracing component.
(a) Elevation (b) Plan (c) Isometric view
(a) Elevation (b) Plan (c) Isometric view
1—seam; 2—bolt
Figure 2 Structure Connecting Component
1—diagonal bracing; 2—structure connecting component; 3—anchor;
4—screw fastener; 5—load-bearing hanger rod; 6—pipe
Figure 3 Lateral Seismic Bracing
1—diagonal bracing; 2—structure connecting component; 3—anchor; 4—screw fastener; 5—load-bearing hanger rod; 6—pipe
Figure 4 Longitudinal Seismic Bracing
1—screw fastener; 2—dedicated channel steel; 3—pipe or device
Figure 5 Single Tube Seismic Bracing
1—structure; 2—long nut; 3—long screw; 4—square gasket;
5—channel steel fastener; 6—expansion bolt; 7—seismic connection component;
8—channel steel; 9—rapid structure connecting component
Figure 6 Door-shaped Lateral Seismic Bracing
3 Basic Requirements for Design
3.1 General Requirements
3.1.2 This clause specifies the arrangement of important equipment rooms of mechanical and electrical equipment. The important equipment rooms refer to fire pump room, domestic water pump room, boiler room, refrigerator room, heat exchange station, distribution substation, diesel generator room, communication room, fire control room, security monitoring room, etc.
3.1.6 This clause specifies the equipment needing no seismic fortification. The equipment greater than 1.8kN and needing seismic fortification shall include:
1 The equipment with gravity greater than 1.8kN for hanging pipe;
2 Domestic water pipe system and fire-fighting pipe system above DN65;
3 Duct system with rectangular section area greater than or equal to 0.38 m2 and circular diameter greater than or equal to 0.7m .
4 Electrical pipe with inner diameter greater than or equal to 60mm, as well as cable ladder, cable tray, and busway with gravity greater than or equal to 150N/m.
3.1.7 See Figures 7~13 for the root structure of seismic bracing, reinforced concrete structure and steel structure:
1—screw connector ; 2—anchor bolt; 3—C-shaped channel steel; 4—square gasket
Figure 7 Root Structure of Hanger Rod (Reinforced Concrete Structure)
1—structure connecting component; 2—anchor bolt; 3—bolt; 4—c-shaped channel steel
Figure 8 Root Structure of Structure Connecting Component (Reinforced Concrete Structure)
1—full-weld connection; 2—u-shaped connecting component
Figure 9 Root Structure of Hanger Rod for Steel Beam (Steel Structure)
1—welding; 2—screw; 3—reinforced c-shaped channel steel
Figure 10 Root Structure of Hanger Rod for C-Shaped Channel Steel (Steel Structure)
1—welding; 2—structure connecting component; 3—reinforced c-shaped channel steel
Figure 11 Root Structure of Structure Connecting Component Used for C-shaped Channel Steel (Steel Structure)
1—structure connecting component
Figure 12 Root Anchorage Structure of Structure Connecting Component Used for Steel Beam (Steel Structure)
1—structure connecting component
Figure 13 Root Welding Structure of Structure Connecting Component Used for Steel Beam (Steel Structure)
3.1.8 Flexible connection or other connection modes (if the gas pipe passes through the seismic isolation layer, the valve and stop valve shall be set outdoors, and earthquake sensor shall be equipped) shall be adopted for mechanical and electrical equipment pipes which pass through the seismic isolation layer, so as to adapt to the horizontal displacement of seismic isolation layer under seismic action; and seismic support shall be arranged on both sides of seismic isolation layer.
3.1.9 Where the expansion bolt or bolt is used at the bottom of building mechanical and electrical equipment engineering facilities to fix with the structural slab, the specification and size of the anchor bolt shall be determined through calculation based on the tensile force and shear force it bears. See Figure 14 for the calculation diagram.
Contents of GB 50981-2014-TWSM
1 General Provisions
2 Terms and Symbols
2.1 Terms
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
6.2 Gas System
7 Building Electricity
7.1 General Requirements
7.2 Settings of System and Equipment
7.4 Equipment Installation
7.5 Conductor Selection and Line Laying
8 Seismic Bracing
8.2 Calculation for Seismic Bracing
8.3 Design for Seismic Bracing
