标题: | 冷轧不锈钢帽型断面腹板之皱曲强度 Web crippling strength of Cold-Formed stainless steel hats |
作者: | 王士庭 Wang, Shih-Timg 陈诚直 Chen, Cheng-Chih 土木工程学系 |
关键字: | 冷轧不锈钢;帽型断面;腹板皱曲强度;Cold-Formed stainless steel;Hat;Web crippling strength |
公开日期: | 2011 |
摘要: | 本研究旨在探讨冷轧不锈钢帽型断面于试体内部双翼(Interior Two-Flange, ITF)受集中荷载之腹板皱曲强度与行为,共进行12支采用不同不锈钢板厚度及不同支承垫宽度之试体,试体均采用SUS 304型沃斯田不锈钢制作。试验完成后进一步进行有限元素验证分析,并与实验结果互相比对以验证分析之可靠度。最后进行参数研究,以54组不同条件之模型分析探讨各参数对腹板皱曲强度的影响。实验结果显示,不锈钢板厚度及支承垫宽度的增加能有效的提升试体腹板皱曲强度。实验结果与规范计算值比较,发现北美洲规范(NAS)与美国土木工程协会(ASCE)规范于腹板皱曲强度的计算上吻合实验结果,然而欧洲规范(EC3)则偏向保守。有限元素分析结果能有效模拟试验结果与行为。参数研究发现除了增加不锈钢板厚度及支承垫宽度外,腹板平坦段高度的减少亦能提高腹板皱曲强度;此外,腹板皱曲强度受到腹板平坦段高度的影响程度会随着支承垫宽度的减小而降低。 This study aims to investigate web crippling strength of single hat sections of stainless steel under the interior two-flange (ITF) loading condition. Twelve specimens, made of austenitic type 304 stainless steel, were designed to have different web thickness and support width. Finite element analysis was further performed to validate the analytic model by comparing the analysis results with test data. Furthermore, parametric study was conducted to study the effect of parameters on the web crippling strength. Test results demonstrated that increasing the thickness and support width resulted in increase of the web crippling strength. In addition, the comparison of the test results with various codes indicated the codes of North American Specification and American Society of Civil Engineering calculated well the web crippling strength except that Eurocode highly overestimated. Results of finite element analysis showed that either the web crippling strength or crippling behavior of the analysis agreed well with test results. Parametric study indicated that decreasing the flat height of the web can also increase the web crippling strength, in addition to the increase of the thickness and support width. Moreover, the effect of flat height of the web on the web crippling strength will be reduced when the support width decrease. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079816507 http://hdl.handle.net/11536/47264 |
显示于类别: | Thesis |
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