|Table of Contents|

Analytical Solutions for Box-girder with Corrugated Steel Webs Considering Interface Slip Effect(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年06期
Page:
94-101
Research Field:
结构工程
Publishing date:

Info

Title:
Analytical Solutions for Box-girder with Corrugated Steel Webs Considering Interface Slip Effect
Author(s):
XU Jing1;  ZHENG Zhi-ren1; 2;  KONG Hua-hui1;  HE Gui-feng1
(1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Poly(Gansu)Industrial Investment Co., Ltd, Lanzhou 730070, Gansu, China)
Keywords:
box-girder with corrugated steel web;  interface slip effect;  shear lag effect;  energy variation method;  deflection
PACS:
TU311
DOI:
10.19815/j.jace.2021.08026
Abstract:
In order to analyze the interface slip effect on improved box girder with corrugated steel webs, considering the shear deformation of the web and the self balance condition of the section axial force, the governing differential equation of composite box girder bridge was established. The expressions of slip displacement function and flange slab maximum longitudinal displacement difference of simply supported box girder were derived. Taking an improved composite box girder with corrugated webs subjected to uniform load as an example, based on the box girder load conditions and boundary conditions, the theoretical equations for the deflection of composite box girder bridge, cross section normal stress and shear lag coefficient of upper and lower flange slab were derived. By adding the elastic connection unit between flange and web to simulate interface slip effect in the finite element software, the correctness of the proposed theoretical methods was verified. Finally, the influence of shear slip stiffness on cross section normal stress, shear lag coefficient and deflection of composite box girder bridge were studied by using the derived theoretical formula. The results show that the theoretical formula is in good agreement with the finite element simulation results, and the proposed formulas can be used in the bridge design or software development. The interface slip stiffness has great influence on the cross section normal stress and deflection of flange of the composite box girder. Under the action of uniform load, compared with that without considering slip effect, the normal stress of upper flange section after considering slip effect decreases by 7.44%, the normal stress of lower flange section increases by 6.79%, and the mid-span deflection of box girder increases by 8.8%. The influence of slip stiffness on the shear lag coefficient of composite box girder flange slab is small, and the influence range is within 1%.

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Last Update: 2022-12-20