双肢冷弯薄壁型钢拼合箱形柱受压试验研究与有限元分析

发布时间：2018-04-17 22:06

本文选题：双肢拼合箱形柱 + 冷弯薄壁型钢　；参考：《建筑结构学报》2017年10期

【摘要】：通过30根由双肢C形和[形冷弯薄壁型钢拼合箱形柱的轴压和偏压试验,得到了试件的荷载-位移曲线和最大荷载,并分析了其屈曲模式和破坏特征。采用ABAQUS程序对拼合截面柱受压性能进行了有限元分析,分析参数主要包括长细比、腹板高厚比、截面高宽比、偏心距与偏心方向等。结果表明:轴压中、长柱系列试件的破坏模式为绕弱轴整体弯曲破坏,轴压短柱系列试件为局部屈曲变形过大而导致的塑性折曲,绕强轴和绕弱轴的偏压试件最终分别为整体弯扭屈曲和整体弯曲破坏;试件的最大轴压荷载及刚度均随着试件长细比的增大而逐渐减小;试件最大轴压荷载随腹板高厚比的增大而减小;试件的截面高宽比较大,绕两个主轴的长细比会相差较大,通过增加翼缘宽度以增大拼合柱绕强轴和弱轴的稳定性,显著提高其最大荷载;偏压拼合柱的最大荷载随着偏心距的增加而降低。
[Abstract]:The load-displacement curve and maximum load of the specimens were obtained by axial compression and biasing tests of 30 C-shaped and cold-formed thin-walled steel columns. The buckling mode and failure characteristics of the specimens were analyzed.The finite element analysis of the compression performance of assembled cross-section columns is carried out by using ABAQUS program. The analysis parameters mainly include the aspect ratio, the ratio of height to thickness of web, the ratio of height to width of section, the eccentricity and eccentricity direction, etc.The results show that in axial compression, the failure mode of long column series specimens is bending failure around the weak axis, and the axial compression short column series specimens are plastic buckling caused by excessive local buckling deformation.The ultimate bending and torsional buckling and bending failure of the specimens under the biasing of the strong axis and the weak axis decrease gradually with the increase of the aspect ratio of the specimens, and the maximum axial compression load and stiffness of the specimens decrease with the increase of the aspect ratio of the specimens.The maximum axial compression load of the specimen decreases with the increase of the ratio of the height to thickness of the web plate, and the ratio of the height to width of the specimen is larger, and the ratio of length to slenderness around the two main axes will differ greatly. By increasing the width of the flange, the stability of the strong axis and the weak axis of the spliced column can be enhanced by increasing the width of the flange.The maximum load of the composite column decreases with the increase of eccentricity.
【作者单位】：长安大学建筑工程学院;重庆大学土木工程学院;
【基金】：国家自然科学基金项目(51408052) 高等学校博士学科点专项科研基金项目(20110205110006) 陕西省工业攻关项目(2014K06-23)
【分类号】：TU392.1

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