水电站中明管按分项系数设计时系数取值建议  

Advice of Coefficient Value in Design of Penstock in Hydroelectric Station as Subentry Coefficient

作　　者：袁子厚[1] 陈明祥[2] 汪碧飞[2] 

机构地区：[1]武汉科技学院理学院 [2]武汉大学土建学院,湖北武汉430072

出　　处：《水力发电》2008年第8期25-27,共3页Water Power

基　　金：国家自然科学基金项目(70671050);湖北省教育厅重点项目(D200517004);重庆交通大学结构工程重点实验室资助项目(20040005,cqbslab06-5)

摘　　要：考虑到管内水重服从对数正态分布,其最大值分布为极值Ⅱ型分布,应用概率极限状态设计法确定了设计表达式中的分项系数,并对给出的分项系数设计表达式进行了可靠度分析,建议修订规范时结构系数取1.6,与SD144—85《水电站压力钢管设计规范》采用的容许应力相比,分项系数设计法的效果较好。Considering that the distribution of water weight in a pipe is logarithmic normal distribution and its maximum value distribution is an extreme-Ⅱ distribution, the probability limit state design method was used to determine the subentry coefficient in design expression and the reliability analysis was made on the subentry coefficient design expression, so this paper suggests the structure coefficient adopts 1.6 during the revised code. Compared with the allowance stresses adopted in the SD144-85 Code ＂Design Code of Penstock for Hydropower Station＂, the design method of subentry coefficient has good effectiveness.

关 键 词：明管 分项系数 可靠度 规范 水电站 

分 类 号：TV732.2[水利工程—水利水电工程]