Study of Shear Deformation's Influence on Deflection of Continuous Composite Box-Girder Bridge with Corrugated Steel Webs

2013 ◽  
Vol 275-277 ◽  
pp. 961-965
Author(s):  
Ming Min Tang ◽  
Li Chao Su ◽  
Shui Wan
Keyword(s):  
Shear Deformation ◽  
Water Diversion ◽  
Uniform Load ◽  
Box Girders ◽  
Concentrated Force ◽  
Element Analysis ◽  
Box Girder ◽  
North Water ◽  
Box Girder Bridge ◽  
Girder Bridge

Taking South-to-North Water Diversion Bridge, a continuous composite box-girder bridge with corrugated steel webs, as the engineering background, the cantilever beam end’s deflection calculation formulae considering shear deformation were deduced by using energy method. Comparing with finite-element analysis (FEA) values and measured values, the formulae which considered both concentrated force and uniform load have enough accuracy. Results show that, shear deformation’s proportion is more obvious in overall deflection of such box-girders which have smaller span ratio, and it’s more than 30%. For continuous composite box-girder bridge with corrugated steel webs, contribution of shear deformation to overall deflection should not be ignored.

Spatial Finite Element Analysis on Bailey Trussed Girder of a Road

2011 ◽  
Vol 422 ◽  
pp. 693-696
Author(s):  
Yan Weng ◽  
Mei Cen ◽  
Ya Guang Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Box Girders ◽  
Element Analysis ◽  
Box Girder ◽  
Construction Scheme ◽  
Box Girder Bridge ◽  
Girder Bridge

A simple box girder bridge with spans 25m is being constructed on the No.2 road of a project of PanZhiHua Steel. A Bailey trussed girder is constructed under the bridge to assist its construction. The paper makes spatial finite element analysis about the Bailey trussed girder. Firstly, the spatial finite element model is built. Then the force, stress and displacement of the girder under six box girders’ self weigh and the construction load are analyzed in detail. Lastly, the construction scheme is optimized. After optimization, all indexes of Bailey trussed girder can meet code requirement.

Static response of curved steel thin-walled box-girder bridge subjected to Indian railway loading

2021 ◽  
Vol 108 (2) ◽  
pp. 63-74
Author(s):  
V. Verma ◽  
K. Nallasivam
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Box Girders ◽  
Box Girder ◽  
One Dimensional ◽  
Thin Walled ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Indian Railway ◽  
Different Response

Purpose: The primary objective of the current study is to numerically model the steel thin-walled curved box-girder bridge and to examine its various response parameters subjected to Indian Railway loading. Design/methodology/approach: The analysis is conducted by adopting a one dimensional curved thin-walled box-beam finite beam element based on finite element methodology. The scope of the work includes a computationally efficient, three-noded, one-dimensional representation of a thin-walled box-girder bridge, which is especially desirable for its preliminary analysis and design phase, as well as a study of the static characteristics of a steel curved bridge, which is critical for interpreting its dynamic response. Findings: The analytical results computed using finite element based MATLAB coding are presented in the form of various stress resultants under the effect of various combinations of Indian Railway loads. Additionally, the variation in different response parameters due to changes in radius and span length has also been investigated. Research limitations/implications: The research is restricted to the initial design and analysis phase of box-girder bridge, where the wall thickness is small as compared to the cross-section dimensions. The current approach can be extended to future research using a different method, such as Extended finite element technique on curved bridges by varying boundary conditions and number of elements. Originality/value: The validation of the adopted finite element approach is done by solving a numerical problem, which is in excellent agreement with the previous research findings. Also, previous studies had aimed at thin-walled box girders that had been exposed to point loading, uniformly distributed loading, or highway truck loading, but no research had been done on railway loading. Moreover, no previous research had performed the static analysis on thin-walled box-girders with six different response parameters, as the current study has. Engineers will benefit greatly from the research as it will help them predict the static behaviour of the curved thin-walled girder bridge, as well as assess their free vibration and dynamic response analysis.

scholarly journals Computation of Deflections for PC Box Girder Bridges with Corrugated Steel Webs considering the Effects of Shear Lag and Shear Deformation

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wei Ji ◽  
Kui Luo ◽  
Jingwei Zhang
Keyword(s):  
Shear Deformation ◽  
Prestressed Concrete ◽  
Displacement Function ◽  
Shear Lag ◽  
Longitudinal Displacement ◽  
Box Girders ◽  
Element Analysis ◽  
Box Girder ◽  
Bridge Model ◽  
Bridge Models

Prestressed concrete (PC) girders with corrugated steel webs (CSWs) have received considerable attention in the past two decades due to their light self-weight and high prestressing efficiency. Most previous studies were focused on the static behavior of CSWs and simple beams with CSWs. The calculation of deflection is an important part in the static analysis of structures. However, very few studies have been conducted to investigate the deflection of full PC girders or bridges with CSWs and no simple formulas are available for estimating their deflection under static loads. In addition, experimental work on full-scale bridges or scale bridge models with CSWs is very limited. In this paper, a formula for calculating the deflection of PC box girders with CSWs is derived. The longitudinal displacement function of PC box girders with CSWs, which can consider the shear lag effect and shear deformation of CSWs, is first derived. Based on the longitudinal displacement function, the formula for predicting the deflection of PC box girders with CSWs is derived using the variational principle method. The accuracy of the derived formula is verified against experimental results from a scaled bridge model and the finite element analysis results. Parametric studies are also performed, and the influences of shear lag and shear deformation on the deflection of the box girder with CSWs are investigated by considering different width-to-span ratios and different girder heights. The present study provides an effective and efficient tool for determining the deflection of PC box girders with CSWs.

Study on Diseases of Multi-Box Girder Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 1182-1185
Author(s):  
Wen Liang Qiu ◽  
Cai Liang Huang ◽  
Zhao Yi Chen
Keyword(s):  
Bearing Capacity ◽  
Box Girders ◽  
Load Bearing Capacity ◽  
Box Girder ◽  
Load Bearing ◽  
Large Load ◽  
Torsion Rigidity ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Design And Construction

Because the multi-box girder bridge has many advantages, such as large torsion rigidity, large load-bearing capacity, stability, fine appearance, good applicability and convenient construction, it is widely used in China. But for the defection existing in design and construction, many box girders have serious diseases. Aiming at the diseases of a viaduct bridge, the causes of diseases are analyzed and the enforcement method is proposed in this paper. The study shows that, though the box girders have large torsion rigidity, the diaphragms are designed necessarily to enhance the transversal connection between the box girders, to make them bear the loads together, to reduce their stresses and deformation, and to reduce the stresses of deck too.

Stress Analysis of Simple-Supported Box Girder Deck Pavement under the Effect of Concrete Cushion

2015 ◽  
Vol 744-746 ◽  
pp. 827-831
Author(s):  
Hu Wang ◽  
Fei Han
Keyword(s):  
Distribution Law ◽  
Interface Shear ◽  
Eccentric Load ◽  
Element Analysis ◽  
Critical Position ◽  
Box Girder ◽  
Simply Supported ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Transverse Slope

In order to study the stress distribution law of simply-supported box girder bridge deck pavement under the effect of triangular concrete cushion, finite element analysis program is used to analyze distribution regularity of stress among asphalt and cement concrete cushion at the thinnest thickness of concrete cushion and transverse slope degree under the action of eccentric load which is applied in the most critical position. The result indicates that the first principal stress in asphalt pavement, the interface normal tensile stress and interface shear stress will reduce when the cushion layer thickness and transverse slope degree increase, however, the thinnest thickness of cushion should not be less than 3 cm. Considering the total weight of structure, cushion thickness should not be too large either. The thinnest cushion thickness of simply supported box girder bridge pavement layer is recommended for 3-4cm while transverse slope for 2-3%.

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

Monitoring and structural analysis of a rehabilitated box girder bridge based on long-gauge strain sensors

2017 ◽  
Vol 17 (3) ◽  
pp. 586-597
Author(s):  
Huang Huang ◽  
Zhishen Wu
Keyword(s):  
Strain Distribution ◽  
Large Scale ◽  
Dynamic Strain ◽  
Strain Sensing ◽  
Element Analysis ◽  
Box Girder ◽  
Damage Models ◽  
Structural Rehabilitation ◽  
Box Girder Bridge ◽  
Girder Bridge

Structural rehabilitation is playing an increasingly important role in civil engineering owing to issues with aging infrastructure. In this context, a feasible inspection and monitoring system is needed to draw up effective structural rehabilitation projects. This article presents a case study of a real box girder bridge strengthened via external post-tensioning. With the aim of evaluating the strengthening project and the structural behavior changes, a large-scale strain sensing system containing four sensing areas was installed on the bridge before strengthening, and the static and dynamic strain distribution changes were recorded during annual inspections. The text focuses on discussing and comparing the variations of strain distribution across the bridge before and after strengthening, as well as the yearly changes the rehabilitated bridge has undergone. From the measured strain responses, we accurately determined that the rehabilitated bridge had undergone an unexpected reduction in its flexural stiffness as well as a torsion action. Moreover, finite element analysis results of three different damage models are discussed to understand the detailed cause for this.

Review of Design and Analysis of Box Girder Bridges And T-Beam Bridges Using IRC Codes

2020 ◽  
pp. 184-189
Author(s):  
Shubham Sirse ◽  
Kuldeep R. Dabhekar ◽  
Isha P. Khedikar ◽  
M. B. Saiwala
Keyword(s):  
Torsional Stiffness ◽  
Box Girders ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Analysis And Design ◽  
Girder Bridges ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Beam Bridge ◽  
T Beam

Bridge is the structure which is used for carrying the traffic over the valley or river by connecting highways or railways. There are types of bridges which are T-beam bridges and box girder bridges where the T-beams are effective in resisting bending providing ductility to the bridges. While box girders gives high torsional stiffness providing ductility, stability and also aesthetics. Different codes with varying design philosophy are used for designing these bridges such as IRC:21-2000 and IRC:112-2011. Hence the purpose of this paper is to compare the results of analysis and design of different papers performed using these codes for both the types of bridges i.e. T-beam and box girder bridge. Various researchers studies are available on the design and analysis of T-beam bridge and box girder bridge using IRC:112-2011 and IRC:21-2000. The purpose of this study is to determine the most economical and preferable design code for both T-beam bridges and box girder bridges.

Parametric study of design variations on the vibration modes of box girder bridges

1991 ◽  
Vol 18 (5) ◽  
pp. 789-798 ◽  
Author(s):  
M. S. Cheung ◽  
A. Megnounit
Keyword(s):  
Finite Element ◽  
Moving Load ◽  
Dominant Mode ◽  
Rate Of Change ◽  
Dynamic Responses ◽  
Human Response ◽  
Element Analysis ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge

Under a moving load, a bridge undergoes deflections and stresses which significantly exceed those caused by the same load when applied statically. These dynamic deflections can cause discomfort to pedestrians using the bridge, since human response is sensitive to accelerations and to the rate of change of acceleration. Another factor affecting human response is the type of vibration in the dominant mode. People tend to react more adversely to torsional modes of vibration than to flexural modes. This paper summarizes the results of an extensive analytical investigation, which was conducted to identify key parameters affecting the changes of dominant mode types and to study the influence of diaphragms and cross bracings on dynamic responses of a twin box girder bridge. The finite element method was used to carry out these analyses. The analytical results indicate that the provision of diaphragms within the boxes at each support, or of a cross-bracing system in-between boxes, can effectively reduce peak accelerations when the dominant mode of vibration is torsional. As a result, the human discomfort and perception to vibration can be improved. Key words: vibration, human response, torsion, flexure, box girder bridge, diaphragm, cross bracing, finite element analysis.

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.

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