摘要
特征值屈曲分析只可预测一个理想线弹性结构的理论屈曲强度,材料非理想性与几何非线性使得大多数结构无法达到它们理论强度极值.极限承载力破坏是伴随结构的材料非线性和几何非线性共同发生的,有些重要结构在无法了解结构在复杂荷载作用下的临界荷载时只能靠放大安全系数来保证结构的安全,这样进行结构的设计和建造,存在较大的盲目性,势必造成大量的隐患和浪费.以一座大跨钢箱拱桥为例,通过建立空间杆系模型,考虑多种荷载布置方式以及温度影响,对结构极限承载力进行了研究,为大跨钢箱拱桥设计和评价提供了一定的理论依据.
Eigenvalue buckling analysis can only forecast the theoretical buckling strength of an ideal linear elastic structure, because of the unideal property of material and geometrical nonlinearity, most structures can not reach their theoretical strength limit. The failure of the ultimate load capacity always occurs with material and geometrical nonlinearity. Some important structures just depend on the magnifying the safety factor to ensure the safety of the structures for the situation that the structures are applied on complex load but the critical load is unknown. It is unreliable to design and construct the structures in this way which will cause considerable incipient fault and waste. As a case study, the ultimate load capacity of a large-span steel arch bridge is studied by founding space trusses model with various load distribution and the effect of temperature, which offers a theoretical base for the design and estimation of large-span steel arch bridge.
出处
《华中科技大学学报（城市科学版）》
CAS
2006年第3期8-10,共3页
Journal of Huazhong University of Science and Technology
基金
教育部新世纪优秀人才基金资助项目(2004年度)
关键词
屈曲强度
结构非线性
大跨钢箱拱桥
极限承载力
buckling strength nonlinear property of structure large-span steel arch bridge
ultimate load capacity
