A review of research progress on shear lag effect of bridges

2021 ◽  
Author(s):  
Shukun Duan ◽  
JinYang Gao ◽  
Yiwei Gu ◽  
Jiansheng Fan ◽  
Yufei Liu
Keyword(s):  
Finite Element ◽  
Design Methods ◽  
Theoretical Research ◽  
Research Progress ◽  
Width Ratio ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Lag Effect ◽  
Effective Flange Width

<p>Shear lag effect is a structural effect that must be considered in bridge design. In this paper, the theoretical research progress such as the elastic analytical method, the energy variational method and the bar simulation method of the shear lag effect are reviewed. The factors affecting the shear lag effect and the effective flange width are discussed, the span width ratio is the main factor. The calculation methods of effective flange width according to American, European and Chinese codes are introduced. Based on an engineering case, the results of different specifications are compared with the finite element analysis results, and the inadequacies of the current design specifications are pointed out. The problems of shear lag effect and engineering design methods in the future need to be focused are discussed, including the development of finite element method, experimental research and practical design methods.</p>

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

Study on Shear Lag Effect of a PC Box Girder Bridge with Corrugated Steel Webs under Self Weight

2014 ◽  
Vol 638-640 ◽  
pp. 1092-1098 ◽  
Author(s):  
Rui Juan Jiang ◽  
Qi Ming Wu ◽  
Yu Feng Xiao ◽  
Xiao Wei Yi ◽  
Wei Ming Gai
Keyword(s):  
Bending Moment ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Box Girder ◽  
Lag Effect ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Effective Flange Width ◽  
Width Coefficient

In the present paper, based on the three-dimensional finite element analysis for a three-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 self-weight is carryied out together with the analyslis on the coefficient of the effective flange width. The results show that At the sections in the negative bending moment near the intermediate piers, the shear lag effect in the bridge with corrugated steel webs is more obvious than that in the bridge with concrete webs by 8%; and the corresponding effective flange width coefficient in the bridge with corrugated steel webs is even smaller than 0.9, so the shear lag effect at these sections should be considered in the design of this type of bridges. At the mid-span section of the middle span of a three-span continuous bridge either with corrugated steel webs or concrete webs, the shear lag effect can be omitted since the corresponding effective flange width coefficient there is close to 1.0.

The Finite Element Analysis on Shear-Lag Effect of the Steel Box-Girder

2013 ◽  
Vol 671-674 ◽  
pp. 815-819
Author(s):  
Yi Sheng Li ◽  
Jun Ping Wang ◽  
Wei Liu ◽  
Jian Ming Shen
Keyword(s):  
Finite Element ◽  
Effective Width ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Steel Box Girder ◽  
Lag Effect ◽  
The Finite Element Analysis

The shear-lag effect of steel box-girder is qualitatively analyzed by using the finite element software ANSYS. Various methods to reduce the shear-lag effect are studied, and the most effective method is changing the web layout and increasing the number of box-room among them. The suggested value of effective width to thickness ratio b1/t1 of the flange without considering the shear-lag effect are obtained in this paper.

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.

The Effect of Shear Lag on Long-Term Behavior of Steel/Concrete Composite Beams

2011 ◽  
Vol 255-260 ◽  
pp. 1070-1076 ◽  
Author(s):  
Lin Miao ◽  
De Wei Chen
Keyword(s):  
Finite Element ◽  
Virtual Work ◽  
Current Model ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Viscoelastic Problem ◽  
Lag Effect ◽  
Effective Flange Width ◽  
Long Term Behavior

It is well known that shear lag effect exists in wide flange concrete slabs. Traditionally, the effective flange width method is employed for considering the shear lag effect in a steel/concrete composite beam. The limitation of this method is that the load types and constraint conditions are generally ignored. In this paper, an analytical method using full flange width has been proposed by introducing shear warping shape function and intensity function of the shear warping displacement. By mean of two unknown functions: the vertical displacement of the whole cross section and the intensity of the warping, a variational balance condition which involves equilibrium equations with relevant boundary condition is imposed by the virtual work theorem. As a result, the shear-lag effect is considered by additional virtual external load, expressed as “additional bending moment”. The performance of this method dealing with elastic problem has been verified by finite element method using solid elements. Finally, the method is applied to investigate the long-term behavior of a beam fixed at two ends. It has been found that the results yielded from the code based on the effective flange width method are intervenient between those obtained from the current model with elastic and viscoelastic problem; the result errors of beam finite element model considering shear-lag effect can be modified by the method proposed in this paper.

scholarly journals STUDY ON SPATIAL STRESS EFFECT OF PC CONTINUOUS THIN-WALLED BOX GIRDER BRIDGE

2021 ◽  
Vol 30 (3) ◽  
Author(s):  
Honglei Zhang
Keyword(s):  
Finite Element ◽  
Load Test ◽  
Bottom Plate ◽  
Stress Effect ◽  
Shear Lag ◽  
Element Analysis ◽  
Box Girder ◽  
Lag Effect ◽  
Girder Bridge ◽  
Spatial Stress

In order to study the influence of spatial stress effect and shear lag effect on the cracking of PC continuous thin-walled box girder bridge, a spatial model was established by using ANSYS finite element software to analyze the internal stress distribution of the bridge. The test results are compared with the analysis results of spatial model and plane link system model through the load test of real bridge. The results show that the longitudinal stress is evenly distributed along the width direction, which means that the spatial stress effect and the shear lag effect have little influence on the downdeflection of the bridge. The shear lag coefficient at the longitudinal axis of midspan bottom plate and the intersection of bottom plate and web are larger than other positions, which is most likely to produce cracks caused by stress concentration, and should be strengthened here in practical engineering. The results of load test show that the results of spatial finite element analysis are more reliable than those of plane link system calculation, and the design and construction based on the results of spatial finite element analysis is safer.

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