OUT-PLANE BUCKLING OF TAPERED BEAM-COLUMNS
-
摘要: 利用ANSYS软件对楔形变截面受弯构件进行弹塑性稳定分析,考虑截面塑性开展,引入通用长细比,在通用长细比中考虑楔率和弯矩线性变化的影响,拟合得到新的弯扭屈曲稳定系数公式。对于变截面压弯构件的平面外稳定,提出弯矩项带指数的光滑曲线相关公式,其中轴力项和弯矩项均取自大端的内力及其截面性质,弯矩项的指数考虑长细比和楔率的影响,将拟合公式与有限元程序结果进行对比发现,公式的精度非常好。Abstract: Inelastic analysis stability is carried out for tapered beams by ANSYS,considering plasticity developemnt,introducing the universal slenderness of beams in which the taper ratio and moment ratio are considered,a new formula of stability coefficient is proposed.For the out-plane buckling of tapered beam-columns,another new formula is proposed in which axial force and moment and sectional properties are taked from the larger end of tapered members,and the moment term in the formula takes a exponent that varies with slenderness and taper ratio slightly.FEM result obtained by analysis is compared with the results calculated from the proposed formula,and the result is agreeable.
-
Key words:
- tapered member /
- beam /
- beam-column /
- flexural-torsional buckling
-
[2] 陈婷, 童根树.楔形变截面压杆的弹塑性稳定[J].工业建筑, 2004, 34(10):62-65; 郭彦林, 潘湧.变截面工形柱平面内稳定极限承载力研究[J].土木工程学报, 2004, 37(1):13-19; [3] 朱群红, 童根树.简支楔形工字钢梁的弹性弯扭屈曲[J].建筑结构, 2006, 36(1):31-34; [4] CECS102∶2002门式刚架轻型房屋钢结构技术规程[S]; [5] GB500172003钢结构设计规范[S]; [6] ECCS.Manual on the Stability of Steel Structures[C]//SecondInternational Colloquium on Stability.Brussels:1976:132; [7] 童根树.钢结构的平面外稳定[M].北京:中国建筑工业出版社, 2007; [8] 陈骥.钢结构稳定理论与设计[M].北京:科学出版社, 2006; [9] 童根树, 陈婷, 符刚.楔形变截面压杆绕弱轴的弹塑性稳定[J].钢结构, 2003, 18(5):5-7.
点击查看大图
计量
- 文章访问数: 103
- HTML全文浏览量: 7
- PDF下载量: 66
- 被引次数: 0