基于可靠度的小偏压柱承载力分项系数的确定方法  

A Method of Determining the Partial Factor for Bearing Capacity of Small Eccentrically Loaded Column Based on Reliability

作　　者：赵飒[1] 常乐[2] 闫维明[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100022 [2]中国建筑科学研究院,北京100013

出　　处：《建筑科学》2014年第9期7-11,共5页Building Science

基　　金：住房和城乡建设部科技计划项目(2012-k2-5);中国建筑科学研究院自筹基金课题(混凝土构件承载力评定及可靠度表示方法的校准研究)

摘　　要：本文以结构可靠度设计理论为依据,提出了一种基于统计数据的混凝土构件承载力分项系数的确定方法。根据国内119组钢筋混凝土小偏压柱极限承载力的试验数据,进行统计分析,建立了小偏压柱承载力的物理模型;以本物理模型为基准,结合可靠度设计理论,建立了小偏压柱承载力的校准模型,按两种荷载与抗力标准差之比及考虑和不考虑构件尺寸变异性4种情况下计算了其承载力分项系数。将本模型与中美规范的设计公式进行比较,结果表明本文提出的校准模型的安全储备更合理,构件承载力分项系数的校准方法可行,且具有较大实用性和推广意义。Relying on the design theory of structural reliability, a method of calibrating the partial factor of the concrete members＇ bearing capacity is proposed based on the statistical data. A physical model of bearing capacity is established based on analyzing 119 groups of experiment data of small eccentrically loaded columns＇ ultimate bearing capacity in China. On the basis of the physical model and the design theory of structural reliability, a calibration model is setup, and the partial factor under these four situations are calculated：two ratios between standard deviation of load and resistance, and considering or ignoring member sizes＇ variability. The comparison among the calibration model, Chinese code and American code shows that the safety storage of the calibration model is more reasonable and the method in this article is quite useful and practical, which should be promoted.

关 键 词：小偏压柱 变异系数 构件承载力分项系数 可靠指标 

分 类 号：TU312.1[建筑科学—结构工程]