摘要
《钢管混凝土结构技术规范》(GB 50936—2014)^([1])是基于CECS 254:2012、CECS 28:2012和CECS 159:2004等行业技术规程制定的,包含了实心、空心、圆形及多边形截面钢管混凝土构件的承载力设计公式。在收集大量的试验数据的基础上,给出了规范中圆形及方形钢管混凝土构件轴压承载力设计公式以及CECS159:2004中方形钢管混凝土构件轴压承载力设计公式的计算模式不确定性的统计参数。并利用一次二阶矩法对这些公式进行了可靠度分析。分析了钢材种类、混凝土强度等级、活荷载类别、荷载比对构件可靠度的影响。结果表明,这些设计公式满足"统一标准"中对二级房屋建筑结构的可靠指标的要求。
The latest national standard of the Chinese GB 50936--2014 is formulated based on the technical specifications of concrete filled steel tube, CECS254：2012, CECS28..2012 and CECS159：2004, etc. These contain the bearing capacity formula for CFST with solid, hollow section and various cross-section shapes. The uncertainty of calculation model of the design formulas of axial compression are studied for circular concrete filled steel tube （C-CFST） and square conerete filled steel tube （S-CFST） with solid shape, based on a large number of experimental data. Then the first- order second-moment （FOSM） method is applied to analyze the reliability of these design formulas. The influence of material strength of steel and concrete, live load type and load ratios on the reliability is discussed. The analytical results indicate that the reliability indexes of these design formulas satisfy the demand of the Chinese Code GB 50153--2008 for housing construction structures of second level.
出处
《建筑钢结构进展》
CSCD
北大核心
2017年第2期45-52,67,共9页
Progress in Steel Building Structures
基金
国家自然科学基金(51508425)
中央高校基本科研业务费专项资金(2042014kf0010)
湖北省自然科学基金(2015CFB171)
关键词
钢管混凝土
轴压
承载力
计算模式不确定性
可靠度指标
concrete filled steel tube
axial compression
bearing capacity
uncertainty of calculation model
reliability index
