Behavior of bridge girders with corrugated webs: (I) Real boundary condition at the juncture of the web and flanges

2013 ◽  
Vol 57 ◽  
pp. 554-564 ◽  
Author(s):  
M.F. Hassanein ◽  
O.F. Kharoob
Keyword(s):  
Boundary Condition ◽  
Bridge Girders ◽  
Corrugated Webs ◽  
The Web

Bridge Girders with Corrugated Webs

2000 ◽  
Vol 1696 (1) ◽  
pp. 162-170 ◽  
Author(s):  
Mohamed Elgaaly ◽  
Anand Seshadri ◽  
Roberto Rodriquez ◽  
Sherif Ibrahim
Keyword(s):  
Moment Capacity ◽  
Design Recommendations ◽  
Plate Girders ◽  
Analytical Results ◽  
Corrugated Webs ◽  
Shear Buckling ◽  
The Moment ◽  
The Cost ◽  
Web Plates ◽  
The Web

In plate girders, the use of corrugated webs permits the use of thin web plates without stiffeners, which reduces the cost of beam fabrication and improves fatigue life. Experimental and analytical studies on the behavior of girders with corrugated webs were conducted that have led to design recommendations. For girders with corrugated webs subjected to shear, it was noted from the experimental as well as the analytical results that failure of the web occurs because of local or global shear buckling, which depends on the corrugation configuration. For girders with corrugated webs subjected to uniform bending, the failure was due to yielding and vertical buckling of the compression flange into the web. The test and analytical results indicate that the web offered negligible contribution to the moment-carrying capacity of the beam, and the ultimate moment capacity may be calculated on the basis of the flange yielding, ignoring any contribution from the web. The behavior of girders with corrugated webs under in-plane compressive edge loads applied directly on the top flange was investigated, and design recommendations are made. Tests to examine the behavior of girders with corrugated webs under repeated loads are few. The results from the available tests are reported and compared with the results from test on conventionally stiffened girders with flat webs.

Low-Frequency Sine Webs for Improved Shear Buckling Performance of Plate Girders

2019 ◽  
Author(s):  
Peter Y. Wang ◽  
Maria E. Garlock ◽  
Theodore P. Zoli ◽  
Spencer E. Quiel
Keyword(s):  
Fatigue Cracks ◽  
Low Frequency ◽  
Robotic Welding ◽  
Plate Girders ◽  
Material Efficiency ◽  
Corrugated Webs ◽  
Shear Buckling ◽  
Elastic Shear ◽  
Traditional Strategy ◽  
The Web

<p>Steel plate girders are used extensively in buildings and bridges. Given shear rarely governs, minimizing web thickness is desirable. However, web slenderness can enable shear buckling and fatigue problems. The traditional strategy is to use welded transverse stiffeners; yet transversely-stiffened girders are prone to fatigue cracks and difficult to fabricate at high slenderness ratios. Thus, AASHTO currently limits web slenderness to 150. Alternatively, corrugated web girders overcome these deficiencies but require robotic welding for the web-to-flange weld. Corrugated webs are also limited to small web thicknesses (6mm or less) and girder depths (less than 1.5m) given web forming limits. The authors propose an alternative web geometry, introducing low-frequency sinusoids (LFS) in the web along its length. The LFS web can be welded to the flanges using semi-automatic weld techniques currently employed by bridge fabricators. The reduced web curvature allows for a wider array of web forming techniques with much larger plate thicknesses. In a finite element study, web geometric properties such as sinusoidal frequency and amplitude are varied. Results demonstrate a significant increase in the elastic shear buckling load and ultimate strength using a wavelength equal to the depth of the girder. The results of this study show promise for improved girder durability paired with material efficiency, demonstrating that a web product with constant amplitude and wavelength could work for various girder depths up to 3m and above.</p>

Resistance of prestressed bridge girders to diagonal tension cracking

2021 ◽  
Author(s):  
Marco A. Roosen ◽  
Max A. N. Hendriks ◽  
Yuguang Yang ◽  
Cor van der Veen ◽  
Dick Schaafsma
Keyword(s):  
Tensile Strength ◽  
Failure Mode ◽  
Bridge Girders ◽  
Shear Reinforcement ◽  
Tensile Stresses ◽  
Compressive Stresses ◽  
Eurocode 2 ◽  
Prestressed Bridge Girders ◽  
Improved Model ◽  
The Web

<p>Diagonal tension cracking is the governing failure mode for bridge girders with a thin web that are highly prestressed and contain little shear reinforcement. When assessing existing bridge girders using the Eurocode 2 [1], it often turns out that it is not possible to demonstrate sufficient resistance to diagonal tension cracking. This paper evaluates the method to determine the maximum principal tensile stresses as used in the Eurocode 2 [1] and investigates how flexural cracks affect the principle tensile stresses in the regions without flexural cracks. This paper also investigates how the tensile strength of the web is affected by the presence of compressive stresses and by the size of the area subjected to high tensile stresses. Based on the results of these investigations, an improved model is proposed to determine the resistance to diagonal tension cracking.</p>

Behavior of bridge girders with corrugated webs: (II) Shear strength and design

2013 ◽  
Vol 57 ◽  
pp. 544-553 ◽  
Author(s):  
M.F. Hassanein ◽  
O.F. Kharoob
Keyword(s):  
Shear Strength ◽  
Bridge Girders ◽  
Corrugated Webs

Finite-Element Study of Geometrical Parameters of Corrugated Web Girders

2013 ◽  
Vol 671-674 ◽  
pp. 688-692
Author(s):  
Xiao Long Hu ◽  
Qing Yuan Wang ◽  
Lian Fei Tan
Keyword(s):  
Finite Element ◽  
Design Theory ◽  
Radius Of Curvature ◽  
Geometrical Parameters ◽  
Corrugated Webs ◽  
Corrugated Web ◽  
Composite Bridges ◽  
Weld Depth ◽  
Corrugated Steel Web ◽  
The Web

This paper present the geometrical parameters were conducted to study how they impact the fatigue of the girders with corrugated web by a comprehensive finite element method. Different parameters, such as the oblique angle of the web, the radius of curvature between the web folds, the thickness and width of flange, the height of the beam were investigated. The research object were : promote the application of this structure, especially for corrugated steel web composite bridges on the fatigue design theory and method provide the standard. The numerical results show that geometrical parameters of girders with corrugated webs have great effect on the stress concentration of weld toes. In addition, weld depth and angle have greater impact on the fatigue of the beams with corrugated webs.

Methodology to Verify Residual Strength in Damaged Pontoon’s Vertical Webs Using FEM Buckling and Nonlinear Analysis

2013 ◽  
Author(s):  
Luiz Carlos H. Ricardo ◽  
Fernando de Avellar Torres ◽  
João Franciso B. Ruiz
Keyword(s):  
Finite Element Method ◽  
Boundary Condition ◽  
Finite Element ◽  
Offshore Structures ◽  
Design Criteria ◽  
Scanning System ◽  
Offshore Drilling ◽  
Adjacent Structure ◽  
Drilling Unit ◽  
The Web

This paper introduces a methodology that can be used to verify damaged vertical webs from Semi-Submersible, Mobile Offshore Drilling Unit (MODU) as well as others offshore structures by finite element method. This paper presents an example applied to a vertical web from a triangular MODU, which consists of a triangular deck, three columns, and other supporting structure. It was subjected to damage to one of the three pontoons. The methodology isolates one of the damaged vertical webs and applies the boundary condition on the adjacent structure where the web is located. The web was modeled, using FEM in the both original and damaged condition based on information gathered from a 3D scanning system. The structure was evaluated using the American Bureau Shipping (ABS) Rules and Guides, [1] as design criteria. Based on the results of the analysis, the damaged member slightly exceeds the allowable limits. Reinforcements of the damaged areas were implemented on the damaged panels in order to reduce the stresses acceptable levels.

Comparison of Stresses in Center-Wound Rolls From Two Linear Elastic Models

2003 ◽  
Vol 70 (4) ◽  
pp. 606-610 ◽  
Author(s):  
W. R. Debesis and ◽  
S. J. Burns
Keyword(s):  
Boundary Condition ◽  
Elastic Limit ◽  
The Other ◽  
Linear Elastic ◽  
Wound Rolls ◽  
Stress Boundary Condition ◽  
Residual Strains ◽  
Stress Boundary ◽  
The Web

Two linear elastic models for describing stresses in center-wound rolls have been compared. One model includes wound on residual strains from the web while the other uses a clamped on stress boundary condition. The stress and displacement solutions to these two models, in the linear elastic limit, are shown to have analytical differences, and similarities.

The Shear Stiffness of Flat-sided Corrugated Webs

1968 ◽  
Vol 19 (3) ◽  
pp. 224-234 ◽  
Author(s):  
A. Rothwell
Keyword(s):  
Shear Stiffness ◽  
Experimental Results ◽  
Corrugated Webs ◽  
Corrugated Web ◽  
Considerable Loss ◽  
The Web

SummaryA method of analysis is presented for the shear stiffness of a flat-sided corrugated web, attached at a series of discrete points to flanges either on one side or on both sides of the web. Simple expressions are obtained for the shear stiffness of both types of web, and it is shown that there may be a considerable loss of stiffness due to the method of attachment. A comparison is made with experimental results for corrugated webs with both types of attachment.

The Buckling of Shallow Corrugated Webs in Shear

1968 ◽  
Vol 72 (694) ◽  
pp. 883-886 ◽  
Author(s):  
A. Rothwell
Keyword(s):  
Theoretical Analysis ◽  
Cross Section ◽  
Orthotropic Plate ◽  
Local Mode ◽  
Corrugated Webs ◽  
Corrugated Web ◽  
Shear Buckling ◽  
The Web

Summary The results of a series of shear buckling tests on shallow, flat-sided, corrugated webs are presented, and a comparison made with a theoretical analysis in which the web is assumed to buckle either as an orthotropic plate or in a local mode. An expression is derived for the efficiency of a corrugated web in shear, and used to compare the four shapes of cross-section tested.

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