冷成型不锈钢方管轴心受压柱承载力试验
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摘要
对14根国产304牌号冷成型不锈钢方管进行轴心受压试验,试件的长细比为7.45～73.08,宽厚比为21.17～66.95,得到试件的荷载-位移曲线、荷载-应变曲线、极限荷载和破坏模式.分别采用《不锈钢结构技术规程》和欧洲规范计算,将计算结果与试验结果比较,结果表明:短试件采用欧洲规范和《不锈钢结构技术规程》的计算方法进行设计过于保守,长细比为7.45～19.85的短试件保守值约为14.5%～16.7%,长试件则与规范的设计曲线吻合较好;试验数据与规范曲线的吻合度随着正则化长细比的增大而提高.最后,将试验结果与已有文献试验结果对比,两者结果比较接近,进一步确认了试验结果的正确性.
14 pieces of domestic 304-brand cold-formed square stainless steel tubes under axial compression were experimentally investigated, where the slenderness ratio of specimens was from 7.45 to 73.08 and the width-to-thickness ratio was from 21.17 to 66.95, and load vs displacement curve, load vs strain curve, ultimate load, and failure mode were obtained. At the same time, the stainless steel structure technology specification and European standard were used respectively to calculate these items and the calculation results were compared with the experimental results. The comparison results showed that the design of the short specimen would be too conservative when the European standard and stainless steel structure technical specification were used. The conservative magnitude would be about from 14.5% to 16.7% when lendness ratio was between 7.45 and 19.85, while the behavior of the long specimen would be more consistent with the standard design curve. The agreement of experimental data with standard curve would be improved with the increase of the regularization length ratio. Finally, the experimental result was compared with the experimental result available in literatures, and it was shown that they would coincide with each other so well that the validity of the test result was further confirmed.
14 pieces of domestic 304-brand cold-formed square stainless steel tubes under axial compression were experimentally investigated, where the slenderness ratio of specimens was from 7.45 to 73.08 and the width-to-thickness ratio was from 21.17 to 66.95, and load vs displacement curve, load vs strain curve, ultimate load, and failure mode were obtained. At the same time, the stainless steel structure technology specification and European standard were used respectively to calculate these items and the calculation results were compared with the experimental results. The comparison results showed that the design of the short specimen would be too conservative when the European standard and stainless steel structure technical specification were used. The conservative magnitude would be about from 14.5% to 16.7% when lendness ratio was between 7.45 and 19.85, while the behavior of the long specimen would be more consistent with the standard design curve. The agreement of experimental data with standard curve would be improved with the increase of the regularization length ratio. Finally, the experimental result was compared with the experimental result available in literatures, and it was shown that they would coincide with each other so well that the validity of the test result was further confirmed.
引文
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[2] 杨璐,徐东辰,尚帆,等.奥氏体不锈钢焊接工字型截面轴压构件整体稳定性能试验研究 [J].土木工程学报,2015,48(11):9-15.
[3] LIU Y,YOUNG B.Buckling of stainless steel square hollow section compression members [J].Journal of Constructional Steel Research,2003,59(2):165-177.
[4] YOUNG B.Experimental and numerical investigation of high strength stainless steel structures [J].Journal of Constructional Steel Research,2008,64(11):1225-1230.
[5] 舒赣平,郑宝锋,沈晓明.冷成型不锈钢管轴心受压柱试验研究 [J].建筑结构学报,2013,34(5):87-95.
[6] 张鹏军.不锈钢网架结构试验研究 [J].工业建筑,1998,28(7):7-10.
[7] 中国工程建设标准化协会.不锈钢结构技术规程:CECS 410:2015 [S].北京:中国计划出版社,2015.
[8] European Committee for Standardization.Eurocode3:Design of steel structures-Part 1.4:General rules-supplementary rules for stainless steels:ENV 1993-1-4 [S].Brussels:CEN,2006.