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《China Civil Engineering Journal》 2009-05
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An overview of recent revision of seismic design codes after the 5·12 Wenchuan Earthquake

Wang Yayong(China Academy of Building Research,Beijing 100013,China)  
Lots of damages and collapses of buildings occurred in the May 12 Wenchuan Earthquake. Based on field survey and study of damages of different types of buildings,a prompt revision of seismic design codes of buildings has been carried out. The main revisions to "Standard for classification of seismic protection of building constructions GB 50223—2008" and "Code for seismic design of buildings GB 50011—2001" are summarized here. The definition of seismic fortification class for buildings has been renewed,the seismic class for buildings such as school,hospital and those with large occupancy has been enhanced in the seismic category,and the evacuation shelter and information center have been given a higher seismic class in the GB 50223—2008 code. Main issues in the revision of GB 50011—2001 include:(a) adjustment of the zoning intensity for provinces of Sichuan,Shanxi and Gansu,(b) basic conceptual design for retaining wall and foundation of buildings in the mountainous areas,(c) regulation of building configuration,(d) integration of masonry structure and pre-cast RC floor,(e) requirements of calculation and detailing for the stair shaft,and (f) limit on using single-bay RC frame structure. Some significant damages in epicenter areas are supplied here as a reference for discussions on the consequences of collapse,the importance of multiple defense systems and the integration of RC and masonry structures.
【Fund】: 住房和城乡建设部项目《建筑工程抗震设防分类标准》(GB50223—2008);; 《建筑抗震设计规范》(GB50011—2001)(2008年版)修订
【CateGory Index】: TU352.11-65
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