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.

Interactive shear resistance of corrugated web in steel beam exposed to fire

2016 ◽  
Vol 7 (1) ◽  
pp. 69-78
Author(s):  
Mariusz Marcin Maslak ◽  
Marcin Lukacz
Keyword(s):  
Failure Modes ◽  
Steel Beams ◽  
Steel Beam ◽  
Safety Level ◽  
Design Algorithm ◽  
Content Type ◽  
Corrugated Webs ◽  
Buckling Resistance ◽  
Corrugated Web ◽  
Shear Buckling

Purpose The purpose of this paper is to present and discuss in detail the design approach to shear buckling resistance evaluation for corrugated web being a part of a steel beam exposed to fire. Design/methodology/approach It is based on the interaction between the local and global elastic instability failure modes as well as on the possible yielding of the whole web cross-section during fire. Findings New formulae, adequate for specification of the suitable shear buckling coefficients, depend not only on the web slenderness but also on the temperature of structural steel. Originality/value The methodology proposed by the authors can be added to the current European standard recommendations given in EN 1993-1-2 as a well-justified design algorithm helpful in reliable evaluation of a safety level for steel beams with slender corrugated webs subject to fire exposure. It seems to be highly desirable because, at present, there are no detailed instructions in this field.

scholarly journals Design of Transverse Stiffeners in Plate Girders with Corrugated Web

2019 ◽  
Author(s):  
Witold Basiński
Keyword(s):  
Numerical Models ◽  
Experimental Investigations ◽  
Absolute Minimum ◽  
Plate Girders ◽  
Corrugated Web ◽  
Intermediate Stiffener ◽  
Shear Buckling ◽  
Geometry Parameter ◽  
The Web ◽  
Stiffness Criterion

This study reports investigations into the effect of relative flexural stiffness of intermediate stiffeners γ on the failure zone location in the corrugated web. The study also aimed at obtaining stiffness criterion for intermediate stiffeners that depends on the magnitude of the plate geometry parameter α. To achieve the goals of the study, experimental investigations were conducted into load displacement paths of four exemplary SIN girders. They were simply supported girders, made to full scale, and composed of pre-assembled units. The phenomena occurring in the experiment were represented using the Finite Element Method. For FEM numerical analysis of girders with intermediate stiffeners, models with the web height of 1000, 1250 and 1500 mm, made from 2; 2.5 and 3 mm thick corrugated sheet metal were used. Due to the analysis of 52 girder numerical models, it was possible to propose the stiffness criterion of intermediate stiffeners. The criterion was based on the assessment of shear buckling strength of the corrugated web. Using the regression method, dimensionless coefficients of the stiffener stiffness ks dependent on the optimum stiffness γ were determined. Based on estimated coefficients of the stiffener stiffness ks, the absolute minimum stiffness of intermediate stiffeners Ismin used in corrugated web plate girders was calculated. It was demonstrated that the use of an intermediate stiffener, the stiffness of which is greater than Ismin , additionally leads to a change in the location of the site of the web shear buckling.

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.

scholarly journals Features for calculating beams with a thin transverse corrugated web plate considering bending-twisting forces

2021 ◽  
Vol 263 ◽  
pp. 03006
Author(s):  
Nikolay Tishkov ◽  
Anatoliy Stepanenko
Keyword(s):  
Cross Section ◽  
Numerical Experiments ◽  
Longitudinal Direction ◽  
Arbitrary Cross Section ◽  
Elastic Rods ◽  
Bending Moments ◽  
Relative Height ◽  
Corrugated Web ◽  
Working Together ◽  
The Web

The article describes the features of the work of beams with a thin transverse corrugated web plate. Exponential fractional regression is presented, which allows one to estimate the relative height of web plate sections working together with flanges, obtained by the authors based on an analysis of numerical experiments. Based on the features of the work, a method is proposed for describing the stress state of an arbitrary cross-section of an I-beam with a thin transverse corrugated web plate (the profile of the corrugations is triangular, trapezoidal, sinusoidal) bent in the plane of the web plate and compressed in the longitudinal direction, using the theory of thin-web platted elastic rods by Professor V.Z. Vlasov. The calculations are given for determining the bending-twisting forces (local bending moments and bimoments arising from the action of the main forces) in an arbitrary cross section.

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>

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.

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.

scholarly journals Locally Corroded Stiffener Effect on Shear Buckling Behaviors of Web Panel in the Plate Girder

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Jungwon Huh ◽  
In-Tae Kim ◽  
Jin-Hee Ahn
Keyword(s):  
Corrosion Damage ◽  
Element Analysis ◽  
Buckling Strength ◽  
Lower Shear ◽  
Out Of Plane ◽  
Shear Buckling ◽  
Buckling Failure ◽  
Plane Displacement ◽  
The Web ◽  
Plate Girder

The shear buckling failure and strength of a web panel stiffened by stiffeners with corrosion damage were examined according to the degree of corrosion of the stiffeners, using the finite element analysis method. For this purpose, a plate girder with a four-panel web girder stiffened by vertical and longitudinal stiffeners was selected, and its deformable behaviors and the principal stress distribution of the web panel at the shear buckling strength of the web were compared after their post-shear buckling behaviors, as well as their out-of-plane displacement, to evaluate the effect of the stiffener in the web panel on the shear buckling failure. Their critical shear buckling load and shear buckling strength were also examined. The FE analyses showed that their typical shear buckling failures were affected by the structural relationship between the web panel and each stiffener in the plate girder, to resist shear buckling of the web panel. Their critical shear buckling loads decreased from 82% to 59%, and their shear buckling strength decreased from 88% to 76%, due to the effect of corrosion of the stiffeners on their shear buckling behavior. Thus, especially in cases with over 40% corrosion damage of the vertical stiffener, they can have lower shear buckling strength than their design level.

Case Analysis on PTH Fracture Caused by Twin Copper

2014 ◽  
Vol 1061-1062 ◽  
pp. 431-435
Author(s):  
Xiao He
Keyword(s):  
Thermal Analysis ◽  
Thermal Stress ◽  
Theoretical Analysis ◽  
Cross Section ◽  
Current Density ◽  
Case Analysis ◽  
Actual Case ◽  
Soldering Process ◽  
Root Cause ◽  
Section Analysis

An actual case of PTH fracture after soldering process was studied. By means of cross section analysis using metallography microscope and SEM, together with thermal analysis results, root cause of PTH fracture was concluded that a high density of twin copper weakened the mechanical strength so seriously that PTHs could not undergo thermal stress from soldering process, and higher CTE was attributed to an accelerative factor. Moreover, it is recommended to enhance current density properly and make sure the effectiveness of electroplating additives to prevent twin copper by theoretical analysis.

Tragverhalten von Wellstegträgern mit kreisförmigen Öffnungskranz/Shear buckling of corrugated web beams with circular opening wall

Bauingenieur ◽  
2021 ◽  
Vol 96 (04) ◽  
pp. 114-120
Author(s):  
Zheng Li ◽  
Jörgen Robra
Keyword(s):  
Sich Eine ◽  
Circular Opening ◽  
Finite Elemente ◽  
Corrugated Web ◽  
Shear Buckling

Der Wellstegträger ist ein relativ neuartiges Bauteil mit einem breiten Anwendungsbereich im Stahlbau. Aufgrund des dünnen Stegs des Trägers ergibt sich eine signifikante Gewichtsreduzierung im Vergleich zu gewalzten oder geschweißten I-Profilen. Der Wellstegträger kann mit dünnerem Steg eine größere Steifigkeit aus der Ebene erzie- len, so dass das Beulen des Stegs durch die Wellung verhindert wird. Um eine Erhöhung der Gebäudehöhe zu vermeiden, können Öffnungen für Rohrleitungen in gewellten Stahlträgern eine kostengünstige Lösung darstellen. Dennoch reduzieren die Öffnungen im Wellsteg die Gesamtsteifigkeit und Tragfähigkeit des Trägers. Um das mechanische Verhalten von Wellstegträgern mit kreisförmigen Öffnungen und entsprechendem Öffnungskranz zu untersuchen, wurden drei Versuchskörper durch Bauteilversuche getestet. Die Finite-Elemente-Analyse wurde mit Abaqus durchgeführt. Die Simulationsergebnisse unter Berücksichtigung der geometrischen Imperfektion stimmen gut mit den Experimenten überein. Die Ergebnisse zeigen, dass der Öffnungskranz die Tragfähigkeit des Wellstegträgers mit Öffnungen wirksam verbessern kann. Anhand der Parameterstudie erhöht die Zunahme der Kranzdicke die Empfindlichkeit der geometrischen Imperfektion. Außerdem kann die Tragfähigkeit des Wellstegträgers mit kreisförmigen Öffnungskranz mit einem einfachen Rechenmodell für die Handrechnung auf der sicheren Seite liegend abgeschätzt werden.

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