Analysis on influence factors of stability ultimate bearing capacity of U-rib stiffened plate of steel box girder(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年01期
- Page:
- 58-66
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Analysis on influence factors of stability ultimate bearing capacity of U-rib stiffened plate of steel box girder
- Author(s):
- QIN Feng-jiang; DI Jin; ZHOU Xu-hong; ZHANG Qian; LU Wen-ru
- 1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education(Chongqing University), Chongqing 400045, China; 2. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 3. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 4. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Gansu, China
- Keywords:
- bridge engineering; U-rib stiffened plate; stability ultimate bearing capacity; initial geometric imperfection; residual stress; finite element method
- PACS:
- U448.36
- DOI:
- -
- Abstract:
- Steel box girder was widely used in bridge engineering due to its high stiffness, light weight and other advantages. In order to investigate the stability ultimate bearing capacity of U-rib stiffened plate under compression, finite element method (FEM) which took geometrical and material nonlinearity into account was used to analyze the stability ultimate bearing capacity of 9 specimens of stiffened plate, and the validity of FEM was verified by comparing the FEM results with the experimental results. Furthermore, a detailed parametric study by using the verified FEM was carried out to determine the influence of width-height ratio, the stiffness ratio between bending stiffness of stiffener to the overall centroid and that of parent plate to the overall centroid, initial geometric imperfections and residual stress on stability ultimate bearing capacity of U-rib stiffened plate. The results show that finite element calculation results are in good agreement with test results, which verifies the correctness of the finite element simulation method. Widthheight ratio and ratio between bending stiffness of stiffener to the overall centroid and that of parent plate to the overall centroid, affect the stability ultimate bearing capacity of U-rib stiffened plate significantly and have a good regularity. Influence of initial geometric imperfections on the stability ultimate bearing capacity of U-rib stiffened plate has correlation with the first order buckling shape of U-rib stiffened plate. For U-rib stiffened plate with the first order local buckling of parent plate, when initial geometric imperfection value reaches to 1/100 of the width, the stability capacity of U-rib stiffened plate reduces by 28.3%. Residual stress also influences the stability ultimate bearing capacity of U-rib stiffened plate significantly. The stability ultimate bearing capacity of U-rib stiffened plate maximally reduces by 11.1% after considering residual stress. The research results can provide reference for further research and application of U-rib stiffened plate of steel box girder.
Last Update: 2017-01-22