Deflection of simply supported box girder including effect of shear lag

Lertsima, Chartree; Chaisomphob, Taweep; Yamaguchi, Eiki; Sa-nguanmanasak, Jaturong

doi:10.1016/j.compstruc.2005.09.008

Cited by 19 publications

(13 citation statements)

References 10 publications

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“…The box girder has two additional deformations caused by the shear lag effect and shearing action. Similar results from different researchers [ 16 , 17 , 18 ] have illustrated that the first additional deformation (AD1) caused by the shear lag effect at the mid-span of a simply supported box girder can approach 10% of the bending deflection when the height–span ratio exceeds 0.1. The second additional deformation (AD2) caused by the shear action can also reach 10% of the bending deflection when the shear span–depth ratio is lower than 1/20 [ 19 ].…”

Section: Introductionsupporting

confidence: 83%

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Distributed Deformation Monitoring for a Single-Cell Box Girder Based on Distributed Long-Gage Fiber Bragg Grating Sensors

Shen

Jiang

2018

Sensors

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Distributed deformation based on fiber Bragg grating sensors or other kinds of strain sensors can be used to monitor bridges during operation. However, most research on distributed deformation monitoring has focused on solid rectangular beams rather than box girders—a kind of typical hollow beam widely employed in actual bridges. The deformation of a single-cell box girder contains bending deflection and also two additional deformations respectively caused by shear lag and shearing action. This paper revises the improved conjugated beam method (ICBM) based on the long-gage fiber Bragg grating (LFBG) sensors to satisfy the requirements for monitoring the two additional deformations in a single-cell box girder. This paper also proposes a suitable LFBG sensor placement in a box girder to overcome the influence of strain fluctuation on the flange caused by the shear lag effect. Results from numerical simulations show that the theoretical monitoring errors of the revised ICBM are typically 0.3–1.5%, and the maximum error is 2.4%. A loading experiment for a single-cell box gilder monitored by LFBG sensors shows that most of the practical monitoring errors are 6–8% and the maximum error is 11%.

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Section: Introductionsupporting

confidence: 83%

“…To address these issues, keeping a constant value for λ for the entire calculating process is a simple solution. From the literature [ 16 , 37 ], Table 1 gives recommended values of λ for a single-cell beam under a simply supported condition.…”

Section: Icbm Modifications For Single-cell Box Girdersmentioning

confidence: 99%

Distributed Deformation Monitoring for a Single-Cell Box Girder Based on Distributed Long-Gage Fiber Bragg Grating Sensors

Shen

Jiang

2018

Sensors

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“…The response result could be given in the form of deflection ratio. Lertsima et al [24] defined deflection ratio as the ratio of the deflection due to finite element analysis to that due to the beam theory solution. In that case the finite element result is taken as the actual solution because it includes the effects of shear deformation.…”

Section: Service Loads and Deflection Ratio Service Loads And Deflectmentioning

confidence: 99%

Numerical and Experimental Modeling of the Static Response of Simply Supported Thin-Walled Box Girder Bridges

Ezeokpube

Singh²,

Osadebe

2015

Nig. J. Tech.

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This paper presents numerical and experimental modeling of the static response of simply supported thin This paper presents numerical and experimental modeling of the static response of simply supported thin This paper presents numerical and experimental modeling of the static response of simply supported thin This paper presents numerical and experimental modeling of the static response of simply supported thin-walled walled walled walled reinforced concrete box girder bridges. The work is executed to verify the validity of reinforced concrete box girder bridges. The work is executed to verify the validity of reinforced concrete box girder bridges. The work is executed to verify the validity of reinforced concrete box girder bridges. The work is executed to verify the validity of software software software software developed by the developed by the

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“…The results showed that the plane beamtype model is not suitable for the structural design compared with the spatial beam-type and solid FE models for wide box girder. Lertsima et al 15,16 proposed the empirical calculation formula of the girder deflection at middle section considering the shear lag effects. Hua et al 17 studied the shear lag effects in wide box girder under construction state and vehicle loads based on the beam-type FE model and solid FE model, respectively.…”

Section: Introductionmentioning

confidence: 99%

Test and numerical investigations on the spatial mechanics characteristics of extra-wide concrete self-anchored suspension bridge during construction

Zhou

et al. 2019

International Journal of Distributed Sensor Networks

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This work is aimed at studying the mechanics characteristics of the self-anchored suspension bridge with extra-wide concrete girder during girder erection and system transformation. First, the determination and implementation processes of reasonable completion state were introduced briefly, taking the Hunan Road Bridge as the background project, which is the widest concrete self-anchored suspension bridge in China currently. Then, the ANSYS beam-type finite element model and field monitoring data were integrated to investigate the cable system evolutions during system transformation. Finally, the global refined finite element model was established using solid element to consider the shear lag effects in extra-wide girder. The measured data show that the cable displacements in tensioned domains were characterized by weak coherence and contraflexure characteristics. The longitudinal and transverse stresses of extra-wide girder distributed unevenly along transverse direction. The maximum shear lag coefficients of girder at completion state reached to 1.3. Moreover, small transverse compressive stress, or even the transverse tensile stress reaching to 1.80 MPa, appeared in the top plate segments. The measures including the arrangement optimization of transverse prestressed tendons and monitoring point redistribution were given. The research can provide references for the structural designing and safety control of the similar bridges.

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Deflection of simply supported box girder including effect of shear lag

Cited by 19 publications

References 10 publications

Distributed Deformation Monitoring for a Single-Cell Box Girder Based on Distributed Long-Gage Fiber Bragg Grating Sensors

Distributed Deformation Monitoring for a Single-Cell Box Girder Based on Distributed Long-Gage Fiber Bragg Grating Sensors

Numerical and Experimental Modeling of the Static Response of Simply Supported Thin-Walled Box Girder Bridges

Test and numerical investigations on the spatial mechanics characteristics of extra-wide concrete self-anchored suspension bridge during construction

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