| 基于简化四阶矩法的各种截面钢管混凝土轴压承载力可靠度分析 |
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| 引用本文： | 丁发兴,熊姝宁,向平.基于简化四阶矩法的各种截面钢管混凝土轴压承载力可靠度分析[J].工程力学,2021,38(9):182. |
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| 作者姓名： | 丁发兴 熊姝宁 向平 |
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| 作者单位： | 中南大学土木工程学院,湖南,长沙 410075;湖南省装配式建筑工程技术研究中心,湖南,长沙 410075;中南大学土木工程学院,湖南,长沙 410075 |
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| 基金项目： | 国家自然科学基金面上项目(51978664)；湖南省自然科学杰出青年基金项目(2019JJ20029) |
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| 摘 要： | 该文采用新点估计法和简化四阶矩法对丁发兴提出的钢管混凝土轴压承载力公式进行可靠度分析，该公式考虑了不同截面钢管形状约束系数，且探讨了不同截面形状、混凝土等级、钢材强度等级、两种荷载组合以及不同荷载比对可靠指标的影响。分析结果表明，不同截面形状的钢管混凝土轴压承载力公式的可靠指标均高于3.7，满足目标可靠指标3.2的要求；当办公室活恒载比为1.0时，混凝土强度越高时，可靠指标越大。
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| 关 键 词： | 钢管混凝土 承载力 可靠度 四阶矩 点估计法 |
| 收稿时间： | 2020-09-16 |
RELIABILITY ANALYSIS OF AXIAL BEARING CAPACITY OF CONCRETE FILLED STEEL TUBULAR STUB COLUMNS WITH DIFFERENT CROSS SECTIONS BASED ON SIMPLIFIED FOURTH-MOMENT METHOD |
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| Affiliation: | 1.School of Civil Engineering, Central South University, Changsha, Hu’nan 410075, China2.National Engineering Laboratory for High-speed Railway Construction, Changsha, Hu’nan 410075, China |
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| Abstract: | A new point estimate method and a simplified fourth-moment method are used to analyze the reliability of bearing capacity formula (proposed by Ding Faxing) of concrete-filled steel tubular stub columns (CFST) under axial compression considering the shape constraint coefficient of different steel tube cross sections. The influences of different section shapes, different strengths of concrete and steel, two load combinations and different load ratios on the reliability index are considered. The results show that: the reliability indexes of the bearing capacity formulas of CFST with different cross sections are higher than 3.7, which meets the requirements of target reliability index of 3.2; When the ratio of office live load to dead load is 1.0, the higher the concrete strength, the larger the reliability index. |
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