冷弯薄壁型钢四肢拼合箱形柱偏压受力性能试验研究与数值分析

发布时间：2018-01-09 18:22

本文关键词：冷弯薄壁型钢四肢拼合箱形柱偏压受力性能试验研究与数值分析　出处：《土木工程学报》2016年10期 　论文类型：期刊论文

【摘要】：对冷弯薄壁型钢四肢拼合箱形截面立柱进行轴压和偏压试验研究,得到各试件的荷载-位移曲线和极限承载力,详细分析了试件的屈曲模式和破坏特征。建立了考虑材料、几何和接触非线性的有限元模型对试验试件进行模拟分析,两者吻合较好,验证了有限元方法的正确性。进而采用数值方法分析了构件长细比、螺钉间距和位置、偏心距和偏心方向对该类拼合立柱偏压受力性能的影响。结果表明:双向刀铰支座可以很好的实现铰接;螺钉间距为300mm时,拼合柱各肢整体协同工作性能良好;轴压和绕弱轴偏压试件最终破坏模式均为绕弱轴整体弯曲,绕强轴偏压时,试件破坏模式为弯扭失稳,但扭转不明显;拼合柱的偏压极限承载力和刚度随长细比和偏心距的增大而降低;偏心距相同时,拼合柱绕强轴偏压的极限承载力和刚度比绕弱轴偏压略高。
[Abstract]:The box section columns of cold-formed steel limbs were split axial compression test and bias load - displacement curve of each specimen and the ultimate bearing capacity, a detailed analysis of the buckling mode and failure characteristics of specimens. By considering the material, geometry and contact nonlinear finite element model of the test specimens are simulated and analyzed good agreement, to verify the correctness of the finite element method. And then analyzes the slenderness ratio using the numerical method, and the influence of the spacing of screw position, eccentricity and eccentricity direction force performance of this split column bias. The results show that the bi directional knife hinge bearing can achieve good hinged screw spacing; 300mm, split column each limb wholecollaborative work performance is good; the axial pressure and about the weak axis bias specimen failure mode are around the weak axis of the overall bending, round strong axis bias when the specimen failure mode for flexural torsional buckling, But the torsion is not obvious. The ultimate bearing capacity and stiffness of the combined columns decrease with the increase of slenderness ratio and eccentricity, while the eccentricity is the same, the ultimate bearing capacity and stiffness of the combined columns are slightly higher than those of the weak shaft bias.

【作者单位】：长安大学;
【基金】：国家自然科学基金(51408052) 高等学校博士学科点专项科研基金(20110205110006) 陕西省工业攻关项目(2014K06-23) 陕西省青年科技新星项目(2016KJXX-51)
【分类号】：TU392.1
【正文快照】： 引言冷弯薄壁型钢四肢拼合箱形立柱由2根C型和2根U型截面冷弯薄壁型钢经自攻自钻螺钉拼合而成。该类拼合构件在工程中广泛应用,既可作为独立柱单独使用也常用于冷弯薄壁型钢结构住宅体系的墙体边角、门窗洞口处等需要加强的部位[1]。Whittle J等[2]对由两个卷边槽型截面基本构

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