GB 50223-2008Standard for classification of seismic protection of building constructions (English PDF)

Foreword

According to the requirements of the Document Jianbiao [2008] No. 65 issued by the Ministry of Construction, this standard is revised from the former standard "Standard for Classification of Seismic Protection of Building Constructions" GB 50223-2004, by China Academy of Building Research (CABR) together with related design, research and teaching organizations.

In the revision process of the standard, the experience and lessons about Fenchuan earthquake was summed up through preliminary investigation: after Tangshan earthquake (1976), the Ministry of Construction made the provision that the earthquake-resistant design of building construction shall be taken out based on degree 6 and the non-collapse protection target that the actual earthquake protection is one-degree higher than the normal fortification intensity. Fenchuan earthquake indicated that buildings, that are designed, constructed and used strictly in accordance with the current provision, occur no collapse and failure when the buildings suffer from the earthquake effect that is one-degree higher the local fortification intensity. The lives of the people have been protected effectively.

With a view to the rapid development of our country, based on that "for personintensive public facilities such as school, hospital, gymnasium, museum, culture center, cinema, theater, shopping plaza, and transport junction, the design shall be taken out in accordance with the requirement of earthquake protection higher than local building construction's, to improve the earthquake protection capacity", increase the earthquake protection type of some buildings; widely ask for opinions of relative design, research and teaching organizations, as well as earthquake resistance administrative authority; carry out discussion, revision and supplement many a time; and finalize the standard by the examination.

The revision holds over the classification principle of edition 1995 and edition 2004: whereas, all buildings shall meet the requirements of earthquake protection target "No collapse in large earthquake", buildings that shall be designed based on the earthquake protection degree one-degree higher than the normal buildings are limited within smaller range, and measures to improve the collapse and deformation resistance shall be required.

The revised standard is consisted of 8 chapters totally. The main contents of the revision are as follows:

1. Adjust definition and intension of the categories. 2. Specially strengthen the protection for the infants under accidents like earthquake. 3. Expand the range of person-extensive building; increase the earthquake resistance that person-extensive public facilities such as hospital, gymnasium, museum cultural center, library, cinema, theater, shopping plaza, and transport junction shall comply with.

4. Add the requirements on earthquake refuge building and electronic data centre. 5. Further definite that construction names listed in the standard are instance names, and for construction not listed on the standard, the earthquake protection type may be identified according to the instance construction similar in function and scale.

Local part of the standard may be revised according to concrete requirements in the future, and relevant revision information and content will be published on "Standardization of Engineering Constructions".

Research Center is responsible for the specific explanation of the standard. All relevant organizations are kindly requested to sum up and accumulate your experiences in actual practices during the process of implementing this standard. The relevant opinions and advice, whenever necessary, can be posted or passed on to Handling Crew of "Standard for Classification of Seismic Protection of Building Constructions", China Academy of Building Research (No.30, Northern Third Ring Road (East), Beijing, China 100013; E-mail: ieecabr@cabr.com.cn). International Engineering Design Institute, China Electronics Engineering Design Institute, Beijing Central Engineering and Research Incorporation of Iron and Steel Industry, Beijing General Municipal Engineering Design & Research Institute, China Aviation Industry Designing Studying Institute, General Power Planning and Design Institute Radio, Film and Television Design and Research Institute, Beijing Huayu Engineering Co., Ltd., SINOPEC Engineering Incorporation, Tongji University Shen Shungao, Wu Dean, Zhang Xiangchen, Miao Disong, Luo Kaihai, Zheng Jie, Ke Changhua, Liu Yu and Huang Zuojian yy

1.0.1 This standard is formulated with a view to defining protection type and earthquake-resistant design, and corresponding earthquake protection standard, and relieving seismic hazard effectively. 1.0.2 The standard is applicable to earthquake protection classification of building constructions within earthquake protection area. 1.0.3 All building constructions in earthquake protection area shall be identified 1.0.4 The establishment of professional standard for classification of seismic protection of building constructions shall comply with the classification principles specified in this standard.

For building constructions with special requirement but not listed with special requirements in the standard, the earthquake protection classification shall comply with the special specifications.

9 degree, the earthquake counter measures higher than degree 9 shall be taken

3.0.4 The standard lists only construction examples of seismic fortification types in key sectors; for constructions which function and scale is similar or close to that of example constructions, the Seismic Fortification type can be identified according to the example construction. Constructions not listed in the standard should be listed as standard fortification type. 4.0.1 This chapter is applicable to constructions related to disaster prevention and relief of civic, industrial and mining enterprises. 4.0.2 Constructions for disaster prevention and relief shall be categorized into seismic fortification type in accordance with the social consequence and function of earthquake relief. 4.0.3 Seismic Fortification classification of medical buildings shall meet following provisions: 1) For buildings for policlinic, medical implements and hospitalization attached with important medical duty in class-3 hospital shall be categorized into special fortification type. 2) For buildings for policlinic, medical implement and hospitalization in Class II and III hospitals, medical houses of village and town hospitals with surgery and emergency room, important constructions for commanding, communication, and transport systems of emergency aid centers at or above country level, and constructions of independent blood supply centers at or above country level, the Seismic Fortification type shall be important fortification type. 3) For medical buildings for industrial and mining enterprises, the Seismic Fortification type can be identified as the type of urban medical building example buildings. 4.0.4 The Seismic fortification type of fire engine house and attendance house shall be categorized into important fortification type. 4.0.5 The Seismic fortification type of constructions for disaster-prevention emergency command center of town with 200-thousand population or more, and at or above country level, shall not be less than the important fortification type. For constructions of disaster prevention emergency command system of industrial and mining enterprises, the seismic fortification type may be categorized into that of urban medical emergency command system constructions. 4.0.6 Seismic fortification type of buildings for disease prevention and control center shall meet following provisions: 1) For constructions or blocks of disease prevention and control center that bears the duties of researching, testing and storing highly-toxic high-risk contagious disease, the seismic fortification type shall be categorized into special fortification type. 2) For constructions of disease prevention and control centers at or above country or county-level city, which are exclusive form ones specified in Item 1, the yy seismic fortification type shall be categorized into important fortification type. 4.0. […]