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QIAO Peng, ZHOU Xu-hong, DI Jin. Shear lag effect analysis of flat steel box girder[J]. Journal of Traffic and Transportation Engineering, 2014, 14(4): 36-44.
Citation: QIAO Peng, ZHOU Xu-hong, DI Jin. Shear lag effect analysis of flat steel box girder[J]. Journal of Traffic and Transportation Engineering, 2014, 14(4): 36-44.
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Shear lag effect analysis of flat steel box girder

  • 1.

    School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China

  • 2.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 3.

    School of Civil Engineering, Chongqing University, Chongqing 400044, China

More Information
  • Author Bio:

    QIAO Peng(1982-), male, lecturer, PhD, +86-29-82334828, qiaopeng@chd.edu.cn

  • Received Date: 2014-03-17
  • Publish Date: 2014-08-25
    Abstract
  • The shear lag effects of flat steel box girder under concentrated and uniform loads were studied by using finite element method.Considering the reasonable ranges of design parameters of flat steel box girder, the influences of some parameters including the width and height of cross section, the thicknesses of top and bottom slabs, the thicknesses and spacings of longitudinal and transverse diaphragms on shear lag effects were analyzed.Based on the result of theoretical analysis, the practical formula was proposed to calculate the shear lag coefficient of flat steel box girder by using mathematical regression analysis, and the calculation result of practical formula was compared with the result of finite element method.Analysis result indicates that span-width ratio has the most significant influence on shear lag effects, when the span-width ratio increases from 1.786 to 8.926, the shear lag coefficients of top and bottom slabs decrease from 1.40 and1.32 to 1.07 and 1.06, and decrease by about 20%.When the thickness of longitudinal diaphragm increases from 10 mm to 30 mm, the shear lag coefficient of side web decrease by 7%, while the coefficients at other positions change by less than 1%.When the ratio of longitudinal diaphragm spacing to girder width increases from 0.430 to 0.582, the shear lag coefficient increases by 9%.Other parameters have negligible effect on shear lag coefficient.The relative error between the results of proposed practical formula and finite element method is less than1%, which conforms the formula has higher calculation precision, and meets the need of engineering calculation.

     

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