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

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.

Theoretical and Experimental Investigations on Shear Lag Effect of Double-Box Composite Beam with Wide Flange under Symmetrical Loading

2015 ◽  
Vol 31 (6) ◽  
pp. 653-663 ◽  
Author(s):  
S.-W. Hu ◽  
J. Yu ◽  
Y.-Q. Huang ◽  
S.-Y. Xiao
Keyword(s):  
Composite Beam ◽  
Experimental Investigations ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Theoretical Derivation ◽  
Energy Principle ◽  
Lag Effect ◽  
Symmetrical Loading ◽  
Stress Behaviors ◽  
Minimum Potential Energy Principle

ABSTRACTA new type of steel-concrete composite beam with double-box cross-section is proposed in this paper. In order to investigate stress behaviors and deflection characteristics of such composite beam with wide flange considering the shear lag effect, theoretical analysis and experimental study are launched simultaneously. Based on the minimum potential energy principle, governing differential equations in view of the shear lag effect are deduced by energy variational method, and analytical solutions of it's stress and deflection under the effect of symmetrical loading are calculated. The preceding analyses show that relative error is less than 14.71%, with a good agreement, and farther show that this method of theoretical derivation, which is used for analyzing shear lag effect of composite beam with wide flange, has certain reference and guidance.

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

2004 ◽  
Vol 42 (8) ◽  
pp. 1199-1210 ◽  
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

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

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

A CURVED BOX BEAM ELEMENT CONSIDERING SHEAR LAG EFFECT AND ITS STATIC AND DYNAMIC APPLICATIONS

2002 ◽  
Vol 253 (5) ◽  
pp. 1131-1139 ◽  
Author(s):  
WU YAPING ◽  
LAI YUANMING ◽  
ZHU YUANLIN ◽  
PAN WEIDONG
Keyword(s):  
Beam Element ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Box Beam ◽  
Lag Effect

Experimental Investigations of Shear Lag Effect in Orthotropic Composite Box Beam

2010 ◽  
Vol 150-151 ◽  
pp. 1750-1753
Author(s):  
Ya Ping Wu ◽  
Yin Hui Wang ◽  
Li Xia Wang ◽  
Zu Guang Bian
Keyword(s):  
Compressive Strength ◽  
High Strength ◽  
Experimental Investigations ◽  
Curing Time ◽  
Hydration Products ◽  
Shear Lag ◽  
Box Beam ◽  
Lag Effect ◽  
Composite Box Beam ◽  
Resistance Value

The influence of curing time on the mechanical property of the phosphoaluminate cement (PAC) was investigated, and the mechanism was discussed as well. The phase composition and morphology of hydration products, electrical properties, porosity and pore size distribution of PAC cured different age were analyzed with XRD, EIS and MIP. The results showed PAC has the property of early-high strength, and the compressive strength of PAC cured for 1 day was about 70% of 28 days’. The main hydration products of PAC are micro-crystal phase and gel of phosphate and phosphoaluminate which formed compacter microstructure. In addition, there are no calcium hydroxide (CH) and ettringite (AFt) produced during the process of hydration. The compressive strength of PAC increased with age, which was due to more products continuously produced. The ac resistance analysis manifested as the change of the nyquist pattern and resistance value.

scholarly journals A Shear Lag Analysis for Composite Box Girders with Deformable Connectors

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. 

Coupled Mechanism on Interfacial Slip and Shear Lag for Twin-Cell Composite Box Beam Under Even Load

2017 ◽  
Vol 34 (5) ◽  
pp. 601-616 ◽  
Author(s):  
J. Yu ◽  
S. W. Hu ◽  
Y. C. Xu ◽  
B. Fan
Keyword(s):  
Composite Structures ◽  
Structural Features ◽  
Interfacial Slip ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Closed Form Solutions ◽  
Concrete Plate ◽  
Box Beam ◽  
Lag Effect ◽  
Composite Box Beam

AbstractA model of Twin-cell Composite Box Beam (TCCBB), which is composed of concrete plate and thin-walled steel box beam with twin-cell, is proposed in this paper. Combined with structural features, longitudinal interfacial slip mode (LISM) and related shear hysteresis functions (SHFS) of this TCCBB model are defined respectively; analytical formulation describing combination effect between interfacial slip and shear lag is launched for this TCCBB model under even load. Based on established governing differential equations and its relative boundary conditions (calculated with compatible mechanism of interfacial slip and shear lag effect), closed form solutions of normal stress and shear stress are derived for this TCCBB model, as well as effective shear-lag coefficient and effective coupled behavior coefficient. To obtain more accurate computational results of specific coupled mechanism of this TCCBB model, numerical example is carried out to analyze and predict coupled mechanism of interfacial slip and shear lag effect for this type of composite structures.

Entity Analysis of Shear Lag about Grooved Beam

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.

scholarly journals Shear Lag Effect In The Numerical Experiment

2015 ◽  
Vol 61 (3) ◽  
pp. 31-50 ◽  
Author(s):  
M. Szumigała ◽  
K. Ciesielczyk
Keyword(s):  
3D Model ◽  
Beam Theory ◽  
Structural Elements ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Lag Effects ◽  
Plate Buckling ◽  
Lag Effect ◽  
Comparison Of The Results ◽  
Elastic Shear

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.

scholarly journals Experimental study and finite element analysis on shear lag effect of thin-walled curved box beam under vehicle loads

2018 ◽  
Vol 169 ◽  
pp. 01040
Author(s):  
Hailin Lu ◽  
Heng Cai ◽  
Zheng Tang ◽  
Zijun Nan
Keyword(s):  
Finite Element ◽  
Vehicle Speed ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Box Beam ◽  
Lag Effect ◽  
Vehicle Loads ◽  
Load Types ◽  
Load Size

Shear lag effects of curved box beam under vehicle loads are investigated by using three-dimensional finite element method, where 4 parameters of vehicle loads, load size, vehicle speed, vehicle load position, load types, are considered. The change rules of stress distribution and shear lag coefficients of upper flange at mid-span are obtained when the loads move to the mid-span. The results indicate that under vehicle loads, the peak shear lag coefficients is at the junction between the flange and web, shear lag effect is prominent, shear lag effect is greatly influenced by vehicle speed and vehicle load position, while load size and load types almost don’t affect shear lag coefficients but do affect the stress. The model experiment of a cantilever curved box beam is carried out to compare with finite element analysis, and the error between them is small, which testify the validity and reliability of finite element model.

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