Shear Lag Effect In The Numerical Experiment

AbstractThe standard PN-EN 1993-1-5: 2008 (Eurocode 3) compared with the standard (PN-B-03200: 1990) used previously in Poland, introduces extended rules referring to the computations of the bearing capacity of the plated structural elements including the shear lag effect. The stress distribution in the width flanges is variable. Therefore in the case of the beam with the shear lag effect cannot be calculated by the classic beam theory.In this article a comparison of the results of the calculations of forces distribution, stresses and displacement according to the rule presented in PN-EN 1993 and results of the numerical computations for 3D model (using finite element method) is presented. The elastic shear lag effects, the elastic shear lag effects including effects of the plate buckling and the elastic-plastic shear lag effects including the local instabilities were analysed. The calculations were performed for beams with a small and a large span and an influence of stiffeners was analysed.

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Parametric Analysis of the Shear Lag Effect in Tube Structural Systems of Tall Buildings

Applied Sciences ◽

10.3390/app11010278 ◽

2020 ◽

Vol 11 (1) ◽

pp. 278

Author(s):

Ivan Hafner ◽

Anđelko Vlašić ◽

Tomislav Kišiček ◽

Tvrtko Renić

Keyword(s):

Parametric Analysis ◽

Numerical Models ◽

Tall Buildings ◽

Structural Systems ◽

Structural Elements ◽

Structural System ◽

Shear Lag ◽

Shear Lag Effect ◽

Lag Effect ◽

Secondary Structural Elements

Horizontal loads such as earthquake and wind are considered dominant loads for the design of tall buildings. One of the most efficient structural systems in this regard is the tube structural system. Even though such systems have a high resistance when it comes to horizontal loads, the shear lag effect that is characterized by an incomplete and uneven activation of vertical elements may cause a series of problems such as the deformation of internal panels and secondary structural elements, which cumulatively grow with the height of the building. In this paper, the shear lag effect in a typical tube structure will be observed and analyzed on a series of different numerical models. A parametric analysis will be conducted with a great number of variations in the structural elements and building layout, for the purpose of giving recommendations for an optimal design of a tube structural system.

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Study on the Shear Lag Effect of the PC Box Girder Bridge with Corrugated Steel Webs under Concentrated Loads

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.5054 ◽

2014 ◽

Vol 644-650 ◽

pp. 5054-5060

Author(s):

Rui Juan Jiang ◽

Yu Feng Xiao ◽

Xiao Wei Yi ◽

Qi Ming Wu ◽

Wei Ming Gai

Keyword(s):

Shear Lag ◽

Shear Lag Effect ◽

Element Analysis ◽

Box Girder ◽

Current Time ◽

Lag Effects ◽

Lag Effect ◽

Box Girder Bridge ◽

Girder Bridge ◽

Effective Flange Width

There are few studies about the shear lag effect and the effective flange width of the PC (Prestressed Concrete) box girder bridge with corrugated steel webs throughout the world in current time. In the present paper, based on the three-dimensional finite element analysis for a long-span continuous PC box girder bridge with corrugated steel webs and the corresponding conventional box girder bridge with concrete webs, a comparative study on the shear lag effect under vertical loads are carryied out together with the analyslis on the coefficient of the effective flange width. The results show that in the PC box girder with corrugated steel webs, the transverse distributions of longitudinal normal stress on the section of the slabs are obviousely non-uniform and they are different with those in the conventional PC box girder with concrete webs. And moreover, the shear lag effects in top slab of the PC box girder with corrugated steel webs are almost less obvious than those of the conventional PC box girder with concrete webs. However, the shear lag effects in bottom slab of the PC box girder with corrugated steel webs are almost similar to those of the conventional PC box girder with concrete webs, no matter what kind of vertical bending moment the cross section is subjected to

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A Shear Lag Analysis for Composite Box Girders with Deformable Connectors

Acta Polytechnica ◽

10.14311/640 ◽

2004 ◽

Vol 44 (5-6) ◽

Author(s):

V. Křístek

Keyword(s):

Harmonic Analysis ◽

Shear Lag ◽

Shear Lag Effect ◽

Box Girders ◽

Lag Effects ◽

Lag Effect

A method is proposed for shear lag analysis which can be applied to steel-concrete composite box girders. The proposed method uses harmonic analysis and allows the determination of shear lag effects from simple calculations so that the method is regarded as a design aid. The character of the method can illustrate the influence of certain key parameters upon the extent of the shear lag effect.

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Shear Lag Effect in Single Plane Cable-Stayed Bridge

Advances in Structural Engineering ◽

10.1177/136943329800100406 ◽

1998 ◽

Vol 1 (4) ◽

pp. 301-306 ◽

Cited By ~ 1

Author(s):

Shih Toh Chang ◽

Qiwei Zhang ◽

Shiduo Zhang

Keyword(s):

Axial Force ◽

Beam Theory ◽

Test Results ◽

Shear Lag ◽

Shear Lag Effect ◽

Single Plane ◽

Cable Stayed Bridge ◽

Lag Effect ◽

Combined Action ◽

Minimum Potential

The shear lag effect in thin-walled trapezoidal box sections with inclined stiffeners within the cell is analyzed using the principle of minimum potential energy. Due to the combined action of axial force and moment in a cable-stayed bridge, the normal stress in the pylon is given by [Formula: see text]. The coefficient of shear lag can be written as [Formula: see text], where σ is the actual stress taking shear deformation of slabs into account and [Formula: see text] is the stress evaluated by elementary beam theory. In this paper, the longitudinal displacement under axial force is assumed to vary parabolically transversely across the section. Due to moment, a quartic variation is adopted. Two sets of differential equations with boundary conditions are theoretically derived. An example is illustrated by theoretical analysis and test results.

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Entity Analysis of Shear Lag about Grooved Beam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.533 ◽

2014 ◽

Vol 602-605 ◽

pp. 533-535

Author(s):

Mu Chen ◽

Jiang Hong Xue ◽

Neng Gan

Keyword(s):

Steel Beam ◽

Shear Lag ◽

Shear Lag Effect ◽

Lag Effects ◽

Lag Effect ◽

Prestressed Reinforcement

We establish the entity model of groove beams in Midas FEA. Then we compare and analysis the shear lag effect of prestressed reinforcement caused in different locations. It can provide some suggestions for prestressed rib of groove beams. The result shows that when the prestressed steel beam is located in the middle of small beam, the effect of shear lag is maximum and the shear lag effects of prestressed in two ends are similar, Prestressed reinforcement can be arrangement refer to the results.

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Experimental Investigations of Shear Lag Effect in a Simply Supported [0o ∕±45o2 ∕ 0o]T Laminated Box Beam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.117-119.858 ◽

2011 ◽

Vol 117-119 ◽

pp. 858-861

Author(s):

Ya Ping Wu ◽

Zhi Xiang Zha ◽

Li Xia Wang ◽

Yin Hui Wang

Keyword(s):

Structural Engineering ◽

High Efficiency ◽

Experimental Investigations ◽

Shear Lag ◽

Shear Lag Effect ◽

Normal Stress Distribution ◽

Lag Effects ◽

Box Beam ◽

Lag Effect ◽

Thin Walled

With the features of high efficiency, low consumption and good mechanical characteristic, thin-walled composite box beams have been broadly adopted in structural engineering, and its mechanical behavior has became an active research area. As shear lag effect can bring an uneven normal stress distribution on the flanges, it would remarkably affect the strength design of thin-walled beams. This paper focuses on the experimental investigations of shear lag effects in [0o∕±45o2∕ 0o]T laminated box beam under concentrated loads, and test results indicates that the shear lag effect in this composite box beam can be simulated by the two parabola.

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A New Approach for Free Vibration Analysis of Thin-Walled Box Girder Considering Shear Lag Effect

Advances in Civil Engineering ◽

10.1155/2019/3902828 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10

Author(s):

Zuolong Luo ◽

Haoyun Yuan ◽

Xirong Niu

Keyword(s):

Boundary Condition ◽

Free Vibration ◽

Free Vibration Analysis ◽

Beam Theory ◽

Dynamical Response ◽

Shear Lag ◽

Shear Lag Effect ◽

Box Girder ◽

Lag Effect ◽

Thin Walled

The thin-walled box girder (T-WBG) is widely applied in the long-span bridge structures during the past decades due to its lighter self-weight and better mechanical properties. The shear lag effect (SLE), an essential aspect of T-WBG which governs the stress and the deformation, is rather necessary to be revealed properly. The extraordinary issue of T-WBG analysis nowadays is the SLE impact on its dynamical response to external load. This paper proposes an improved finite element method (FEM) to obtain the realistic vibration characteristics of the T-WBG considering the SLE by theory analysis and formula derivation. Firstly, based on the classical plate and shell theory as well as beam theory, the T-WBG was divided into shell subunit for the roof and beam subunit for web and floor, respectively. Secondly, a 3-order polynomial which is consistent with the experiment results was adopted as the axial-displacement interpolation function of the roof subunit, whose nodal displacements parameters were also taken as the basic. Thirdly, the nodal displacement parameters of the web subunit and floor subunit were deduced by the basic according to the principle of deflection consistency. It is shown through a numerical example that the proposed method is much more economical to achieve reasonable accuracy than traditional FEM analysis software when dealing with the free vibration problem of the T-WBG considering the SLE. Besides, it is also observed that the natural frequency values considering the SLE have a trend of decreasing markedly in general, and the influence of SLE on higher-order frequency is more significant than on the lower one under the boundary condition of cantilever supported, while a contrary effect under the boundary condition of simple supported.

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Analysis on Shear Lag Effect of Box Girder Subject to Dynamic Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.501-504.811 ◽

2014 ◽

Vol 501-504 ◽

pp. 811-814 ◽

Cited By ~ 1

Author(s):

Yun Guo Zhang ◽

Ying Nan Li

Keyword(s):

Dynamic Load ◽

Design Theory ◽

Static Load ◽

Great Influence ◽

Shear Lag ◽

Shear Lag Effect ◽

Box Girders ◽

Box Girder ◽

Lag Effects ◽

Lag Effect

Shear lag effect of box girders under static, transient dynamic load and harmonic dynamic load has been studied, respectively, through finite element method. Shear lag effects under different load conditions were compared and dynamic loading influence on shear lag was analyzed. The results show that the dynamic load has great influence on shear lag of thin box girder that can not be neglected. During the research, the eyesight was transfer from the conventional static load to the dynamic load to study the shear lag problem of box girder. The research conclusions will be useful for the design and construction of bridges and will enrich the design theory of box girder.

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