accumulate their experiences in practice.Any comment and advice is welcome to submit to the Code Panel by the address:IEE,CABR,No.30,Bei San Huan Dong Road,Beijing 100013.(e-mail:ieecabr public3.bta.net.cn). Chief Editorial Unit:China Academy of Building Research(CABR) Participating units:Institute of Engineering Mechanics (IEM)of China Seismology Bureau;China Institute of Building Technology Research;Institute of Building Research of Ministry of Metallurgical Industry;Institute of Architecture Design of the Ministry of Con- struction;Institute of Project Planning and Research of the Ministry of Machinery Indus- try;China Institute of International Engineering Design of Light Industry;Institute of Ar- chitecture Design of Beijing:Institute of Architecture Design of Shanghai;Institute of Build. ing Design of Mid-southern China;Institute of Building Design and Research of North western China;Institute of Building Design and Research of Xinjiang Autonomous Region; Institute of Building Design and Research of Guangdong Province;Design Institute of Yun nan Province;Institute of Building Design and Research of Liaoning Province;Institute of Architecture Design of Shenzhen;Geological Reconnaissance Institute of Beijing;Institute of Building Design and Research of Shenzhen University;Qinghua University;Tongji Univer- sity;Harbin Building University:Science and Technology University of Mid China Chongging Building University;Yunnan Polytechnic University;Construction College of Southern China (West campus) Major draftsmen:Xu Zhenghong,Wang Yayong (The following is according to the Chinese phonetic alphabetically) Cai Yiyan,Chen Fusheng,Chen Jian,Dai Guoying,Dong Jincheng,Fan Xiaoqing, Fu Xueyi,Gao Xiaowang,Gong Sili,Hu Qingchang,Lai Ming,Li Guoqiang,Liu Hui shan,Lv Xilin,Ou Jinping,Pan Kaiyun,Qian Jiaru,Qin Quan,Rong Baisheng,Sha An, Su Jingyu,Sun Pingshan,Tang Jiaxiang,Wang Dimin,Wang Junsun,Wang Yanshen, Wei Chengji,Wu Mingshun,Xu Jian,Xu Yongji,Ye Liaoyuan,Yuan Jinxi,Zhang Qian- guo,Zhou Bingchang,Zhou Fulin,Zhou Xiyuan,Zhou Yongnian. Translated by:Liu Xiaoguang,Wan Lihua,Li Xiaoxia,Dai Guoying Proofread by:Dai Guoying,Wang Yayong