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
