Standard No.:	GB/T 50121-2005
Chinese Name:	建筑隔声评价标准
English Name:	Rating standard of sound insulation in buildings
Professional Classification:	P31 Architectural physics
Professional Classification:	GB National Standard
ICS Classification:	91.120.20 Acoustics in building. Sound insulation
Issued by:
Issued on:	2005-07-15
Implemented on:	2005-10-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	27000 words
Price(USD):	810 (USD)
Delivery:	via email in 1-8 business day

1 General Principles

1.0.1 This Standard was formulated with a view to evaluating the sound insulation performance of buildings and building elements and reasonably determining the levels of sound insulation performance.
1.0.2 This Standard is applicable to the single-number evaluation and performance grading of air-borne sound insulation and impact sound insulation of buildings and building elements.
1.0.3 For the evaluation carried out according to the air-borne sound insulation and impact sound insulation of buildings and building elements of this Standard, the measuring method by using raw data shall be implemented in accordance with current national measurement of sound insulation standard.
1.0.4 The evaluation of sound insulation shall comply with not only this Standard, but also meet the requirements of other relevant current national standard and specifications.


2 Terms and Symbols

2.0.1 Measurement quantity
A group of measured air-borne sound insulation or impact sound insulation data of 1/3 octave or octave, dB.
2.0.2 Weighting
The method of obtaining the single-number after the integration of a group of measuring quantity by a group of reference values.
2.0.3 Single-number quantity
The single-number worked out after the weighting of measuring quantity according to the method specified in this Standard, dB.
2.0.4 Reference values
A group of reference values of weighting of measuring quantity in determining single-number quantity, dB.
2.0.5 Air-borne sound
Air borne noise in the process of construction.
2.0.6 Impact sound
Noise caused by impacting on building structures.
2.0.7 Unfavorable deviation
The decibel of sum of reference value and single-number quantity of measuring amount of some frequency band lower than (air-borne sound insulation) or larger than (impact sound insulation) those of this frequency band, dB.
2.0.8 Spectrum adaptation term for air-borne sound insulation
The adaptation value to be added to the single-number quantity in consideration of noise spectrum characteristics, dB.