西安建筑科技大学学报(自然科学版)

在各国轻钢结构设计规范中,冷弯薄壁型钢轴压承载力的计算主要基于有效宽度法和直接强度法.本文通过研究美国钢铁协会(AISI)规范和中国冷弯钢规范(GB 50018—2014征求意见稿)中有效宽度法和直接强度法的计算公式,以76根常规槽形截面试验杆件为对象,对比基于不同计算方法得到的轴压承载力,分析两国规范中基于两种算法计算结果的精度、可靠性和差异性.计算结果表明:中国规范(意见稿)的直接强度法和美国规范的有效宽度法计算结果和试件试验承载力更接近,中国规范(意见稿)的有效宽度法的计算结果偏保守,而美国规范的直接强度法计算的承载力偏危险且离散性最大.

In the light steel structure design codes of various countries, the calculation of the axially buckling loads of cold-formed thin-walled steel members is mainly based on the effective width method and direct strength method. In this paper, through the study of the formulas in American Iron and Steel Institute(AISI)and the Chinese Cold-formed Steel Specification(GB 50018—2014 draft), 76 specimens of regular channel sections are taken as the objects, the comparison of axially buckling loads obtained from the different calculation methods with the experiment results was conducted. The accuracy, reliability and the differences of calculation results based on the algorithms in the two countries' specifications are analyzed. Results show that the calculation results of the direct strength method in the Chinese code(draft)and the effective width method in the American code are closer to the bearing capacity of the specimens. The calculation results of the effective width method in the Chinese code(draft)are conservative, while the calculation results of the direct strength method in the American code are dangerous and discrete.

引言
1 有效宽度法
2 直接强度法
3 算例分析
4 结论

表1 文献[12]试件承载力的计算值与试验值对比<br/>Tab.1 Comparison of ultimate loads between the computation and test for specimens in literature [12]

表1 文献[12]试件承载力的计算值与试验值对比
Tab.1 Comparison of ultimate loads between the computation and test for specimens in literature [12]

表2 文献[13]试件承载力的对比<br/>Tab.2 Comparison of ultimate loads in literature [13]

表2 文献[13]试件承载力的对比
Tab.2 Comparison of ultimate loads in literature [13]

表3 文献[14]试件承载力的对比<br/>Tab.3 Comparison of ultimate loads in literature [14]

表3 文献[14]试件承载力的对比
Tab.3 Comparison of ultimate loads in literature [14]

表4 文献[15]试件承载力的对比<br/>Tab.4 Comparison of ultimate loads in literature [15]

表4 文献[15]试件承载力的对比
Tab.4 Comparison of ultimate loads in literature [15]

表5 文献[16]试件承载力的对比<br/>Tab.5 Comparison of ultimate loads in literature [16]

表5 文献[16]试件承载力的对比
Tab.5 Comparison of ultimate loads in literature [16]

图1 Kf(CN)/Kf(AI)-ρ关系<br/>Fig.1 Relationship between Kf(CN)/Kf(AI)-ρ

图1 Kf(CN)/Kf(AI)-ρ关系
Fig.1 Relationship between Kf(CN)/Kf(AI)-ρ

图2 Be(CN)/Be(AI)-ρ关系<br/>Fig.2 Relationship between Be(CN)/Be(AI)-ρ

图2 Be(CN)/Be(AI)-ρ关系
Fig.2 Relationship between Be(CN)/Be(AI)-ρ

图3 Pne(CN)/Py和Eq.(6)对比<br/>Fig.3 Comparison of the Pne(CN)/Pywith Eq.(6)

图3 Pne(CN)/Py和Eq.(6)对比
Fig.3 Comparison of the Pne(CN)/Pywith Eq.(6)

图4 Eq.(8)和Eq.(9)对比<br/>Fig.4 Comparison of Eq.(8)with Eq.(9)

图4 Eq.(8)和Eq.(9)对比
Fig.4 Comparison of Eq.(8)with Eq.(9)

图5 Pnl(CN/Pnl(AI)-λl关系<br/>Fig.5 Relationship between Pnl(CN/Pnl(AI)-λl

图5 Pnl(CN/Pnl(AI)-λl关系
Fig.5 Relationship between Pnl(CN/Pnl(AI)-λl

图6 Pt/Pne和(Eq.(11))对比<br/>Fig.6 Comparison of the Pt/Pne with(Eq.(11))

图6 Pt/Pne和(Eq.(11))对比
Fig.6 Comparison of the Pt/Pne with(Eq.(11))

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备注

引言

1 有效宽度法

2 直接强度法

3 算例分析

4 结论

期刊信息