楔形H型钢短柱在循环荷载作用下的试验研究与数值模拟
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摘要
变截面H型钢构件是轻钢结构体系中经常采用的构件形式,探索其抗震性能必要而迫切。该文对7个楔形薄腹H型钢短柱进行了在恒定轴力下的拟静力试验,分析了其在反复水平荷载作用下的局部屈曲产生与发展过程,试验现象表明:局部屈曲是试件最终破坏的主要原因之一;根据试验结果绘制了试验试件的滞回曲线与骨架曲线,对比了腹板宽厚比、翼缘宽厚比、楔率等参数对骨架曲线的影响。基于ANSYS工作平台,建立了试验试件的数值分析模型,对试验试件进行了循环往复荷载作用下的全过程分析,分析中考虑了双重非线性、初始几何缺陷、残余应力等因素的影响。将数值计算结果与试验结果进行了对比分析,讨论了试件破坏形态、滞回曲线、最大承载力等方面的对比结果。分析结果表明:数值模拟能够较好地反映试件的试验结果。(4)数值计算获得的滞回曲线较试验获得滞回曲线饱满,在后继进行大规模循环荷载参数分析以提炼楔形H型钢压弯构件恢复力模型过程中应充分注意这一点。
Steel portal frames with tapered beams and (or) columns with thin web have been widely used, often suffered local buckling during static loadings and earthquake loadings. In order to investigate the seismic performance of H-section tapered columns, seven H-section steel short columns with various dimensions have been tested under a cyclic loading first. The local buckling and the damage phenomena of the specimens have been analyzed. From the test results, hysteretic curves, load-displacement sketch curves have been obtained and discussed. Based on ANSYS, the numerical analysis mode has been established and the whole process has been analyzed, in which the effects of local imperfections of the web, yielding, residual stress and large deflections are considered. According to the results from the numerical analysis and experiment, the failure mode, hysteretic curves and ultimate load have been discussed. It is found that the numerical analysis can generate comparable results to the experiment.
Steel portal frames with tapered beams and (or) columns with thin web have been widely used, often suffered local buckling during static loadings and earthquake loadings. In order to investigate the seismic performance of H-section tapered columns, seven H-section steel short columns with various dimensions have been tested under a cyclic loading first. The local buckling and the damage phenomena of the specimens have been analyzed. From the test results, hysteretic curves, load-displacement sketch curves have been obtained and discussed. Based on ANSYS, the numerical analysis mode has been established and the whole process has been analyzed, in which the effects of local imperfections of the web, yielding, residual stress and large deflections are considered. According to the results from the numerical analysis and experiment, the failure mode, hysteretic curves and ultimate load have been discussed. It is found that the numerical analysis can generate comparable results to the experiment.
引文
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[2]Goto Yoshiaki,Wang Qingyun,Obata Makoto.FEM analysis of the hysteretic behavior of thin-walled columns[J].Journal of Structural Engineering,1998,124(10):1290―1301.
[3]Fukumonto Y,Kusama H.Local instability tests of plate elements under cyclic uniaxial loading[J].Journal of Structural Engineering,1985,111(5):1051―1067.
[4]Fukumonto Y,Kusama H.Cyclic behavior of plates in-plane loading[J].Eng.Struct.,1985,7:56―63.
[5]Lindner J.Stability of structural members general report[J].Journal of Construction Steel Research,2000,55(1):29―44.
[6]Dubina D,Goina D,Georgescu M.Recent research on stability analysis of thin-walled cold-formed steel members[J].Construct.Steel Res.,1998,46(1):172―173.
[7]郝际平.钢结构在循环荷载作用下的局部屈曲、低周疲劳的试验与理论研究[D].西安:西安建筑科技大学,1995.Hao Jiping.Experimental and theoretic research of local buckling,low-cycle fatigue of steel structures under cyclic loading[D].Xi’an:Xi’an University of Architecture&Technology,1995.(in Chinese)
[8]苏明周.箱形截面钢构件在地震作用下的相关屈曲破坏机理及抗震设计对策[D].西安:西安建筑科技大学,2002.Su Mingzhou.Interact buckling failure and seismic resistant design method on steel box members under earthquake[D].Xi’an:Xi’an University of Architecture&Technology,2002.(in Chinese)
[9]陈城.变截面宽肢薄腹构件滞回性能的数值分析和实验研究[D].上海:同济大学,2003.Chen Cheng.Experimental research and numerical analysis on the hysteretic behavior of tapered steel members with thin walls[D].Shanghai:Tongji University,2003.(in Chinese)
[10]CECS102,门式刚架轻型房屋钢结构技术规程[S].2002.CECS102,Technical specification for steel structure of light-weight building with gabled frame[S].2002.(in Chinese)
[11]乔磊.变截面H型钢柱稳定性能的试验研究与数值分析[D].北京:北京交通大学,2006.Qiao Lei.Experimental and numerical analysis on the buckling behavior of tapered H-section steel column with thin-web[D].Beijing:Beijing Jiaotong University,2006.(in Chinese)
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