高温后不锈钢方管柱的力学性能试验研究
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摘要
为研究高温对不锈钢方管柱的影响,本试验以高温条件,长径比以及壁厚作为参数对不锈钢方管柱的力学性能进行了研究。通过试验得到了试件的失效模式、荷载—位移曲线以及荷载—应变曲线,并分析了高温、壁厚以及长径比对试件极限承载力、刚度以及延性的影响。研究结果表明:高温对试件的失效模式无明显影响,但会降低试件的极限承载力;高温后,壁厚较大的试件的延性会提高,而壁厚较小的试件的延性会降低;试件的极限承载力以及延性会随着壁厚的增加而提高。此外,本文还采用数值分析的方法对整个试验过程进行了模拟,通过与试验结果的对比,可以发现该有限元模型能够很好地对高温后不锈钢方管柱失效模式进行预测。
The elevated temperatures,ratio of length to diameter and wall thickness were set as the parameters in the test to investigate the mechanical behaviors of square stainless steel columns. The failure modes,ultimate bearing capacity,stiffness and ductility were presented. The effects of temperatures,ratio of length to diameter and wall thickness on the failure modes,ultimate bearing capacity,stiffness and ductility of the square stainless steel columns were studied. The results indicate that elevated temperature had no effect on the failure modes. The ultimate bearing capacity decreases after the square stainless steel columns exposed to elevated temperature. After beingexposed to elevated temperature,the ductility of the square stainless steel columns with thick walls increases,but the ductility of the columns with thinner walls decreases. The ultimate bearing capacity and the ductility of the square stainless steel columns increase with the thickness. Besides,numerical analysis is proposed to simulate the test process,which testifies the validity of the model to forecast the failure mode of square stainless steel columns.
The elevated temperatures,ratio of length to diameter and wall thickness were set as the parameters in the test to investigate the mechanical behaviors of square stainless steel columns. The failure modes,ultimate bearing capacity,stiffness and ductility were presented. The effects of temperatures,ratio of length to diameter and wall thickness on the failure modes,ultimate bearing capacity,stiffness and ductility of the square stainless steel columns were studied. The results indicate that elevated temperature had no effect on the failure modes. The ultimate bearing capacity decreases after the square stainless steel columns exposed to elevated temperature. After beingexposed to elevated temperature,the ductility of the square stainless steel columns with thick walls increases,but the ductility of the columns with thinner walls decreases. The ultimate bearing capacity and the ductility of the square stainless steel columns increase with the thickness. Besides,numerical analysis is proposed to simulate the test process,which testifies the validity of the model to forecast the failure mode of square stainless steel columns.
引文
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[2]韩林海,徐蕾,冯九斌,等.钢管混凝土柱的防火保护层厚度[J].消防科学与技术,2001,11(6):1-4.
[3]李焕群,史可贞.不同升温速率下钢管柱构件抗火试验[J].消防科学与技术,2016,35(7):895-899.
[4]李晓东,唐伟,靳乐,等.火灾下圆钢管混凝土柱轴心受压承载力的简化计算研究[J].建筑科学,2015,31(5):65-68.
[5]HAN S H,CHEN Y,XIE W T.Behaviour of square hollow steel tubular(SHST)stub columns after elevated temperature[J].Journal of Constructional Steel Research,2017,136:177-192.
[6]吴耀鹏,张旭,李晓蕾.典型受火方式下型钢混凝土异形柱耐火极限研究[J].钢结构,2017,32(11):117-122.
[7]GARDNER L,NG K T.Temperature development in structural stainless steel sections exposed to fire[J].Fire Safety Journal,2006,41(3):185-203.
[8]UY B,TAO Z,HAN L H.Behaviour of short and slender concrete-filled stainless steel tubular columns[J].Journal of Constructional Steel Research,2011,67(3):360-378.
[9]CHEN Y,FENG R,SHAO Y,et al.Bond-slip behaviour of concrete-filled stainless steel circular hollow section tubes[J].Journal of Constructional Steel Research,2017,130:248-263.
[10]TAO Z,GHANNAM M.Heat transfer in concrete-filled carbon and stainless steel tubes exposed to fire[J].Steel Construction,2014,61(61):1-11.
[11]HAN L H,CHEN F,LIAO F Y,et al.Fire performance of concrete filled stainless steel tubular columns[J].Journal of Harbin University of Civil Engineering&Architecture,2013,56(6):165-181.
[12]TAO Z,GHANNAM M,SONG T Y,et al.Experimental and numerical investigation of concrete-filled stainless steel columns exposed to fire[J].Journal of Constructional Steel Research,2016,118:120-134.
[13]中华人民共和国国家质检监督检验检疫总局.金属材料室温拉伸试验方法:GB/T 228-2002[S].北京:中国标准出版社,2002.
[14]霍静思,韩林海.ISO-834标准火灾作用后钢管混凝土的轴压刚度和抗弯刚度[J].地震工程与工程振动,2002,22(5):143-151.
[15]CHEN Y,FENG R,WANG J.Behaviour of bird-beak square hollow section X-joints under out-of-plane bending[J].Journal of Constructional Steel Research,2015,106:234-245.
[16]韩林海.钢管混凝土结构:理论与实践[M].北京:科学出版社,2007.