Experimental study on partial-combination method in continuous composite girder

2021 ◽  
Author(s):  
Hang Su ◽  
Qingtian Su ◽  
Wensheng Yu ◽  
Yunjin Wang ◽  
Minghui Zeng
Keyword(s):  
Concrete Slab ◽  
Bending Moment ◽  
Combination Method ◽  
Steel Girder ◽  
Advantages And Disadvantages ◽  
Girder Bridges ◽  
Composite Girder ◽  
Rubber Sleeve ◽  
Negative Bending ◽  
Composite Girders

<p>Cracking of concrete slab in the negative bending moment region of continuous composite girders is a key problem which needs to be solved in the design of continuous composite girder bridges. The main reason of concrete cracking in the negative bending moment region of continuous composite girder is tensile stress under the effects of temperature and load in the portion of integration. The paper gives the method of partial-combination to connect steel girder with concrete slab, that is, a rubber sleeve is placed on the stud of the negative bending moment region to increase the slip between the concrete slab and the steel girder at the joint. Two specimens of negative bending moment region are designed to observe the mechanical properties in the negative bending moment region of composite girders when using the method of partial-combination. The advantages and disadvantages of the partial-combination method are analysed.</p>

Numerical analyses of joint with steel endplates, headed stud anchors and concrete cross-beam in continuous steel-concrete composite girder bridges

2021 ◽  
Author(s):  
Bruno Briseghella ◽  
Junping He ◽  
Junqing Xue ◽  
Zordan Tobia
Keyword(s):  
Concrete Slab ◽  
Bending Moment ◽  
Element Model ◽  
Reinforcement Ratio ◽  
Continuous Steel ◽  
Moment Capacity ◽  
Girder Bridges ◽  
Negative Bending ◽  
Headed Stud ◽  
Parametric Analyses

<p>Short and medium span continuous steel-concrete composite (SCC) girder bridges are becoming more and more popular. The problems caused by the negative bending moment in the continuous SCC girders cannot be ignored. In order to investigate the performances of the continuous joints between adjacent SCC girders, consist of steel endplates and headed shear stud connected to concrete cross-beam, the finite element model was built by using ABAQUS software, of which the accuracy was verified by experimental results. The parametric analyses were carried out to investigate the influences of the strength and reinforcement ratio of the concrete slabs in SCC girders, and the diameters of the horizontal headed shear studs on the performances of the joints. The ultimate moment capacity of the joint increases with the increase in the strength and reinforcement ratio of concrete slab and the diameters of the horizontal headed shear studs.</p>

Prestressing force increment of two-span steel girder

1991 ◽  
Vol 18 (2) ◽  
pp. 163-170 ◽  
Author(s):  
M. S. Troitsky ◽  
Z. A. Zielinski ◽  
N. F. Rabbani
Keyword(s):  
Virtual Work ◽  
Bending Moment ◽  
High Strength ◽  
Bridge Engineering ◽  
Advanced Technology ◽  
Steel Girder ◽  
Girder Bridges ◽  
Prestressing Force ◽  
Negative Bending ◽  
Existing Bridges

The economic advantages and the advanced technology of prestressed steel bridges has opened new opportunities in bridge engineering. The girder bridges prestressed by cables have been recognized as a technique for the design of new bridges as well as the rehabilitation and increasing the load-bearing capacity of the existing bridges. However, the prestressing of steel girders introduces new problems which require special attention and studies. The objective of this paper is to analyze the influence of the prestressing force increment and the induced negative bending moment in two-span steel girder bridges prestressed by external tendons (cables of high strength steel). The proposed analysis is based on the flexibility method. The deformations are calculated by the virtual work method. The analysis is limited to elastic stage only. The equations for calculating the prestressing force increment and the bending moment at the middle support are derived. Numerical examples are solved and the results are compared with those of similar non-prestressed girders. The influence lines are prepared and evaluated for a continuous girder of two equal spans of 60 m in length each. Key words: bridges, post-tensioned steel, force increment, analysis, influence line.

scholarly journals Development Of A Quick Design Method For Composite Concrete Slab-Over Steel I-Girder Bridges For Project Bidding

2021 ◽  
Author(s):  
Ahmed Diab ◽  
Khaled Sennah
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Moment Of Inertia ◽  
Inertia Moment ◽  
Girder Bridges ◽  
Truck Loading ◽  
Load Effects ◽  
Bare Steel

In bridge analysis, designers calculate maximum bending moment, MT, and shear force, VT, of a bridge girder under truck loading, then use available truck fraction, FT to generate the longitudinal live load effects. This Thesis presents structural analysis of different girder configurations subjected to CL-W truck loading. Girder geometries include single-, two-, three- and four-span girders. The maximum shear, deflection and moments were plotted and then used to develop equations to represent their values. Furthermore, a software was developed to perform composite steel I-girder design. The software optimizes the I-girder size based on CHBDC design procedure. Using the developed software, a parametric study was conducted to determine the required composite moment of inertia, moment of inertia of the bare steel section and steel web area to satisfy all design requirements. Empirical equations for these three properties were developed to assist bridge designers in estimating steel I-section sizes for contract bidding.

scholarly journals CONNECTING FORCE BETWEEN CONCRETE SLAB AND STEEL GIRDER AT INTERMEDIATE CROSS BEAMS IN COMPOSITE TWO-I-GIRDER BRIDGES

2006 ◽  
Vol 62 (1) ◽  
pp. 41-52
Author(s):  
Yasutaka SASAKI ◽  
Akihisa KOYAMA ◽  
Kaneyoshi YAMADA ◽  
Masatsugu NAGAI
Keyword(s):  
Concrete Slab ◽  
Steel Girder ◽  
Girder Bridges

scholarly journals Analysis of Stress and Deflection about Steel-Concrete Composite Girders Considering Slippage and Shrink & Creep Under Bending

2015 ◽  
Vol 9 (1) ◽  
pp. 171-176 ◽  
Author(s):  
Cheng Haigen
Keyword(s):  
Differential Equation ◽  
Concrete Slab ◽  
Creep Property ◽  
Beam Theory ◽  
Composite Beams ◽  
Variation Principle ◽  
Steel Girder ◽  
Shear Connectors ◽  
Composite Girder ◽  
Slab Stress

Steel-concrete composite beams are composed of concrete slabs and steel girders by shear connectors. Due to the limited rigidity of shear connector, and the shrink & creep property of concrete, relative slippage exists between the concrete slab and steel girder under bending, and it is difficult to analyze the effect of those factors by the ordinary beam theory, the finite element method(FEM) and so on. A differential equation of equilibrium is constituted corresponding to the compatibility of deformation and the equilibrium of forces of steel-concrete composite beams under particular assumed condition. Finite difference method (FDM) and variation principle are used to solve the differential equation. An example of steel-concrete composite T girder is given to analyze the effect of slippage and concrete shrink & creep on its stress and deflection. The concrete slab stress increases with increased rigidity in the shear connectors. The stress of the steel girder and the deflection of the composite girder decrease with increment in the rigidity of the shear connectors.

scholarly journals Development Of A Quick Design Method For Composite Concrete Slab-Over Steel I-Girder Bridges For Project Bidding

2021 ◽  
Author(s):  
Ahmed Diab ◽  
Khaled Sennah
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Moment Of Inertia ◽  
Inertia Moment ◽  
Girder Bridges ◽  
Truck Loading ◽  
Load Effects ◽  
Bare Steel

In bridge analysis, designers calculate maximum bending moment, MT, and shear force, VT, of a bridge girder under truck loading, then use available truck fraction, FT to generate the longitudinal live load effects. This Thesis presents structural analysis of different girder configurations subjected to CL-W truck loading. Girder geometries include single-, two-, three- and four-span girders. The maximum shear, deflection and moments were plotted and then used to develop equations to represent their values. Furthermore, a software was developed to perform composite steel I-girder design. The software optimizes the I-girder size based on CHBDC design procedure. Using the developed software, a parametric study was conducted to determine the required composite moment of inertia, moment of inertia of the bare steel section and steel web area to satisfy all design requirements. Empirical equations for these three properties were developed to assist bridge designers in estimating steel I-section sizes for contract bidding.

Strengthening of steel girder bridges using coiled pins

2019 ◽  
Author(s):  
Magnús Arason ◽  
Guðmundur Ragnarsson ◽  
Peter Collin ◽  
Robert Hällmark
Keyword(s):  
Bearing Capacity ◽  
Concrete Slab ◽  
Bottom Flange ◽  
Steel Girders ◽  
Steel Girder ◽  
Composite Action ◽  
Shear Connection ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Composite Bridges

<p>A requirement for heavier vehicular transport on the Norwegian road network has resulted in a demand for increased bearing capacity for many of the older bridges in the country. Many of the bridges that have been found to have insufficient capacity against present-day demands are steel girder bridges with concrete slabs without a shear connection between steel and concrete. There is a large number of bridges of this type in Norway and the paper presents strengthening of two of those, in Aust-Agder county in the south of the country. These bridges are approximately 30 m long, single span. The bearing capacity has been upgraded by installing composite action between the steel girders and the concrete slab using coiled pins, in conjunction with thickening of the bottom flange of the steel girders. To obtain composite action, the pins are fitted to tightly drilled holes through the top flange of girders up into the concrete slab. Coiled pins have not been used much for bridge applications. In the work presented, the method has been found to have advantages in terms of cost and workability. Furthermore, the method has benefits when viewed from an environmental standpoint, since it allows strengthening of existing non-composite bridges using relatively little new material, and minimizes traffic disruptions.</p>

Response of fire exposed composite girders under dominant flexural and shear loading

2018 ◽  
Vol 9 (2) ◽  
pp. 108-125 ◽  
Author(s):  
Mohannad Naser ◽  
Venkatesh Kodur
Keyword(s):  
Elevated Temperatures ◽  
Concrete Slab ◽  
Limit State ◽  
Shear Loading ◽  
Critical Parameters ◽  
Buckling Mode ◽  
Steel Girder ◽  
Content Type ◽  
Numerical Studies ◽  
Composite Girders

Purpose This paper aims to present results from numerical studies on the response of fire exposed composite girders subjected to dominant flexural and shear loading. A finite element-based numerical model was developed to trace the thermal and structural response of composite girders subjected to simultaneous structural loading and fire exposure. This model accounts for various critical parameters including material and geometrical nonlinearities, property degradation at elevated temperatures, shear effects, composite interaction between concrete slab and steel girder, as well as temperature-induced local buckling. To generate test data for validation of the model, three composite girders, each comprising of hot-rolled (standard) steel girder underneath a concrete slab, were tested under simultaneous fire and gravity loading. Design/methodology/approach The validated model was then applied to investigate the effect of initial geometric imperfections, load level, thickness of slab and stiffness of shear stud on fire response of composite girders. Findings Results from experimental and numerical analysis indicate that the composite girder subjected to flexural loading experience failure through flexural yielding mode, while the girders under shear loading fail through in shear web buckling mode. Further, results from parametric studies clearly infer that shear limit state can govern the response of fire exposed composite girders under certain loading configuration and fire scenario. Originality/value This paper presents results from numerical studies on the response of fire exposed composite girders subjected to dominant flexural and shear loading.

Sign in / Sign up

Export Citation Format

Share Document