中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2014, Vol. 33 ›› Issue (3): 6-10.DOI: 10.3969/j.issn.1674-0696.2014.03.02

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集中荷载作用下两端固支梁考虑SD 效应的 极限荷载分析

李斌1,2,韦成龙1,李传习2   

  1. 1.湖南理工学院土木建筑工程学院,湖南 岳阳 414006;2.长沙理工大学土木与建筑工程学院,湖南 长沙 410076
  • 收稿日期:2013-01-01 修回日期:2013-02-27 出版日期:2014-06-15 发布日期:2015-01-22
  • 作者简介:李斌(1981—),男,浙江绍兴人,讲师,博士研究生,主要从事工程结构非线性力学分析方面的研究。E-mail:Leebin2009@126.com
  • 基金资助:
    湖南省自然科学基金重点项目(08 JJ3 117) ;长沙理工大学桥梁工程湖南省普通高等学校重点实验室开放基金项目( 10KA06)

Limit Load of the Beam Fixed at Two Ends under Concentrated Load Considering SD Effect

Li Bin 1,2 , Wei Chenglong1 ,Li Chuanxi2   

  1. 1.Department of Construction & Engineering , Hunan Institute of Science & Technology , Yueyang 414006 , Hunan , China; 2.School of Civil Engineering & Architecture , Changsha University of Science & Technology ,Changsha 410076 , Hunan , China
  • Received:2013-01-01 Revised:2013-02-27 Online:2014-06-15 Published:2015-01-22

摘要: 利用结构对称性分析了考虑材料SD效应的两端田支超静定梁,跨中集中荷载作用下的弹塑性加载及变形过 程。材料本构关系简化成拉压屈服极限不同的理想弹塑性模型,推导加载各阶段依赖于拉压屈服极限比的弯矩、位 移解析公式,探讨了材料SD效应对集中荷载作用下两端固支梁变形和塑性极限弯矩的影响。研究表明:考虑材料 的SD效应时梁的抗弯能力提高,实际上是材料自身潜力得到了充分发挥。

关键词: 桥梁工程, 超静定梁, 几何中轴, 弹塑性, SD效应, 极限荷载

Abstract: The elastic-plastic loading and def1ection process of the hyper-static beam fixed at two ends under SD effect was analyzed by the use of symmetry. 1t derived the curvature equations of geometric mid-axis of a perfectly-elastic-plastic beam with different yield strength in tension and compression for different states. The inf1uence of SD effect on plastic limit moment and def1ection were investigated. The results show that the bearing capacity of beams is increased , which is in fact the latent power of materials been brought into full play when considering SD effect.

Key words: bridge engineering, statically fixed beam, geometrical mid-axis, elastic-plastic, SD effect, limit load

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