摘要
加劲板的局部稳定是正交异性扁平钢箱梁结构设计中的一个关键问题,我国桥梁设计规范没有这方面的规定。为了解决正交异性扁平钢箱梁结构中闭口加劲板的稳定极限承载力计算问题,以适应我国目前钢桥应用日益广泛的需要,在总结中外学者研究成果和国内外设计规范的基础上,提出一种计算闭口加劲板稳定承载力的计算理论,该理论计入材料非线性、几何非线性、初始几何缺陷、焊接残余应力等4种不利影响,并对加劲板结构的初始几何缺陷大小的取值以及残余应力分布模式进行讨论。为了验证理论的正确性、把握闭口加劲板结构的屈曲特性,设计3种不同结构布置的6块闭口加劲板结构进行稳定承载力模型试验,得到加劲板的破坏形态、极限荷载大小以及荷载-位移关系曲线。试验结果与理论分析结果吻合较好,这表明该理论可用于对闭口加劲板的极限承载力计算。
The local stability of stiffened plates is a key issue in the design of orthotropic steel box girders, which has not yet been included in the specifications of bridge design. A method of calculating the ultimate strength of U-rib stiffened plates is put forward on the basis of research and various design specifications both at home and abroad. Four aspects including material nonlinearity, geometric nonlinearity, initial geometric imperfection and residual stress are taken into consideration. The amplitude of initial geometric imperfection and the distribution pattern of residual stress are also discussed. Model tests for 6 pieces of stiffened plates with different structural arrangements are conducted to verify the proposed method and to understand the buckling characteristics of U-rib stiffened plates. The breaking mode, ultimate load and load-displacement curve are obtained, and the test results agree well with the theorical results.
出处
《土木工程学报》
EI
CSCD
北大核心
2007年第6期42-48,共7页
China Civil Engineering Journal
关键词
正交异性钢箱梁
闭口加劲板
稳定
承载力
非线性
模型试验
orthotropic steel box girder
U-rib stiffened plate
stability
capacity
nonlinear
model test
