Shear lag including axial balance of box beams by finite segment model

Three computer programs, written in FORTRAN WATFIV, are developed to analyze straight, monolithically cast, symmetric concrete box beams with one, two, or three cells and side cantilevers over a simple span or over two spans with symmetric mid-span loadings. The analysis, based on Maisel's formulation, is performed in three stages. First, the structure is idealized as a beam and the normal and shear stresses are calculated using the simple bending theory and St-Venant's theory of torsion. The secondary stresses arising from torsional and distortional warping and shear lag are calculated in the second and third stages, respectively. The execution times on an AMDAHL 580 system are 0.02, 0.93, and 0.25 s for the three programs, respectively. The stresses arising in each stage of analysis are then superposed to determine the overall response of the box section to the applied loading. The results are compared with Maisel's hand calculations. Key words: bending, bimoment, box beam, computer analysis, FORTRAN, shear, shear lag, thin-walled section, torsion, torsional and distortional warping.

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Ultimate load analysis of thin-walled box beams considering shear lag effect

Thin-Walled Structures ◽

10.1016/j.tws.2004.03.013 ◽

2004 ◽

Vol 42 (8) ◽

pp. 1199-1210 ◽

Cited By ~ 2

Author(s):

Yaping Wu ◽

Shaoshui Yu ◽

Chonghui Shi ◽

Jianjun Li ◽

Yuanming Lai ◽

...

Keyword(s):

Ultimate Load ◽

Shear Lag ◽

Shear Lag Effect ◽

Lag Effect ◽

Box Beams ◽

Thin Walled ◽

Load Analysis

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Shear Lag Effect of Continuous Curved Box Girder with Initial Curvature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.1701 ◽

2012 ◽

Vol 538-541 ◽

pp. 1701-1704

Author(s):

You Ming Wu ◽

Yong Jun Lu ◽

Han Shi

Keyword(s):

Model Tests ◽

Shear Lag ◽

Shear Lag Effect ◽

Box Girder ◽

Finite Segment ◽

Homogeneous Solutions ◽

Initial Curvature ◽

Lag Effect ◽

Finite Segment Method ◽

Displacement Patterns

The homogeneous solutions of the governing differential equations for shear lag are used as the displacement patterns of the finite segment are presented. A finite segment model with consideration of initial curvature, bending, torsion and shear lag is established. In addition, the tests of the two-span continuous curved box girder and numerical calculations of the model tests by finite segment method and finite element method are made. The results of the model tests and numerical calculation are consistent with each other. An actual example was given to investigate the shear lag effect of a continuous curved box girder under load. The research results show that the initial curvature has an obvious influence on the shear lag effect of a continuous curved box girder.

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Vertical Deflection of Simply Supported Box Beam with Corrugated Steel Webs Including Effects of Shear Lag and Shear Deformation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.1012 ◽

2012 ◽

Vol 204-208 ◽

pp. 1012-1016 ◽

Cited By ~ 1

Author(s):

Wei Ji ◽

Shi Zhong Liu

Keyword(s):

Finite Element Method ◽

Shear Deformation ◽

Comprehensive Analysis ◽

Shear Lag ◽

The Finite Element Method ◽

Vertical Deflection ◽

Simply Supported ◽

Box Beam ◽

Box Beams ◽

Good Agreement

This paper presents an method to solve the vertical deflection of the box beams with corrugated steel webs, considering both the shear lag and shear deformation of corrugated steel webs. The method is deduced by means of the variational principle. The formulas given by this method is simple and practical. Then, a comprehensive analysis on the effects of shear lag and shear deformation of corrugated steel webs is given for a simply supported box beam with corrugated steel webs under uniformly distributed. The results of vertical deflection obtained by this paper are in good agreement with those obtained by the finite element method (FEM) and the model test, respectively.

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Shear lag prediction in symmetrical laminated composite box beams using artificial neural network

STRUCTURAL ENGINEERING AND MECHANICS ◽

10.12989/sem.2008.29.1.077 ◽

2008 ◽

Vol 29 (1) ◽

pp. 77-89 ◽

Cited By ~ 6

Author(s):

Rajeev Chandak ◽

Akhil Upadhyay ◽

Pradeep Bhargava

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Laminated Composite ◽

Shear Lag ◽

Box Beams ◽

Artificial Neural

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Effect of Shear Lag on Buckling of FRP Box-Beams

Lecture Notes in Civil Engineering - Recent Advances in Structural Engineering, Volume 2 ◽

10.1007/978-981-13-0365-4_65 ◽

2018 ◽

pp. 759-770

Author(s):

M. Kasiviswanathan ◽

Akhil Upadhyay

Keyword(s):

Shear Lag ◽

Box Beams

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Transformed Section Method to Calculate Stress of R.C. Box Beams Considering Shear Lag

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.732 ◽

2012 ◽

Vol 256-259 ◽

pp. 732-736

Author(s):

Li Xia Lin ◽

Nan Hong Ding ◽

Ya Ping Wu

Keyword(s):

Reinforced Concrete ◽

Normal Stress ◽

Constitutive Relation ◽

Variation Principle ◽

Shear Lag ◽

Box Girder ◽

Section Method ◽

Compression Performance ◽

Shear Performance ◽

Box Beams

The tensile and compression performance and shear performance should not be changed when using variation principle to analyze shear lag of box beams. So based on transformed-section method, the section composed with steel and concrete can be transformed to one section made of supposing material. The shear lag of supposing section is analyzed to calculate the distribution of normal stress, then according to the constitutive relation of steel and concrete, the stress of actual section can be obtained. At last, the formula of normal stress in flange slab for reinforced concrete box girder is given.

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