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Elastic And Ultimate Behaviour Of Skew Composite Slab On Steel Girder Bridges Microform
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Author :Alaa El-Din Ahmed Helba Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780315873858 Total Pages :1022 pages Book Rating :4.8/5 (738 download)
Book Synopsis Elastic and Ultimate Behaviour of Skew Composite Slab-on-steel Girder Bridges [microform] by : Alaa El-Din Ahmed Helba
Download or read book Elastic and Ultimate Behaviour of Skew Composite Slab-on-steel Girder Bridges [microform] written by Alaa El-Din Ahmed Helba and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1993 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior, Design and Construction of Horizontally Curved Composite Steel Box Girder Bridges [microform] by : Muayad Whyib Aldoori
Download or read book Behavior, Design and Construction of Horizontally Curved Composite Steel Box Girder Bridges [microform] written by Muayad Whyib Aldoori and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horizontally curved girder bridges have been used considerably in recent years in highly congested urban areas. However, although significant research on physical testing and advanced analysis has been underway for the past decade, the practical employment of many recommendations has not been achieved by the engineering community nor have standards reflecting this work been brought into practice. The design process of curved composite bridges involves tracking the stresses and the potential failure change in the girders during erection, construction and service loading stages. For structural safety and serviceability, the designer estimates the stresses induced within the bridge and assure that they do not exceed the applicable specified limit state as required in bridge design standards. However, the designer may be concerned about the level of approximation that is used in his estimate or even the applicability of the underlying theory. To answer this question and provide the designer with more insight into the behavior of the curved bridges, the field testing during construction and service loading of a curved bridge located near Baltimore, Maryland is re-examined here using linear elastic three-dimensional finite element modeling. Comparisons are made between the finite element results and the measured results. Finally, to facilitate the finite element modeling effort for use by a designer, ANSYS Parametric Design Language (APDL) capabilities are used here to develop an analysis/design tool for "Bath-Tub" style curved steel girder bridges. This tool is then used to evaluate the effects of several important design variables on the response and behavior of the girders during the construction phase. This study demonstrates the ability of finite element modeling to assess the stiffness, serviceability performance, buckling behavior and ultimate strength of curved bridges during construction and it is a major step towards a performance based approach to design for stability. The level of safety or reliability that would be available during the erection and the construction processes of horizontally curved girder bridges represents another major concern for the designer. A three span continuous curved box girder bridge in Houston, Texas is used in this study as an example reflecting current detailing and fabricating practice and it is chosen for a detailed evaluation of the structural safety/reliability during the erection and construction process. This task involves simulating the girder erection and concrete slab placement sequence of the bridge using comprehensive nonlinear three dimensional finite element modeling.
Book Synopsis Development of Design Criteria for Simply Supported Skew Slab-and-girder Bridges by : Hendrik Jacobus Marx
Download or read book Development of Design Criteria for Simply Supported Skew Slab-and-girder Bridges written by Hendrik Jacobus Marx and published by . This book was released on 1986 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elastic analyses, using the finite element method, were done on 108 single span skew slab-and-girder bridges. Each structure had 5 girders and stiffnesses were representative of bridges with pretensioned I-girders or steel I-beam. Spans ranged from 40 to 80 ft, girder spacings from 6 to 9 ft, and the skew angle from zero to 60 degrees. The loadings were multiple point loads representing two HS20 AASHTO vehicles, and the loads were positioned to produce maximum bending moments in the girders. Convergence studies to evaluate the precision of the finite element models were also done, and comparisons were made with the results of other studies. An extensive parametric study was done to determine the most important variables and to gain an understanding of the response of the skew bridge. Expressions for the design moments in interior and exterior girders were then developed. These take into account the span and spacing of girders, the stiffness of the girders relative to the slab stiffness, and the angle of skew. The format is the use of the static moment for a girder, with modifications to this moment based on girder span and spacing, slab to girder stiffness ratio, and skew angle. A similar study was done to obtain factors for the calculation of deflections, starting with the deflection of a simple beam.
Book Synopsis Inelastic Rating Procedures for Steel Beam and Girder Bridges by : Theodore V. Galambos
Download or read book Inelastic Rating Procedures for Steel Beam and Girder Bridges written by Theodore V. Galambos and published by Transportation Research Board. This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Elastic-plastic Behavior of Composite Slab-girder Highway Bridges by : Tzoan Chiang Kuo
Download or read book Elastic-plastic Behavior of Composite Slab-girder Highway Bridges written by Tzoan Chiang Kuo and published by . This book was released on 1973 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Composite Slab-on-girder and Box Girder Bridges at Inelastic and Ultimate Limit States by : Noureddine Benichou
Download or read book Behavior of Composite Slab-on-girder and Box Girder Bridges at Inelastic and Ultimate Limit States written by Noureddine Benichou and published by . This book was released on 1988 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Model Studies of Reinforced Concrete Skew Slab and Beam Bridges Under Ultimate Loads [microform] by : Yih, Jenn-Ching
Download or read book Model Studies of Reinforced Concrete Skew Slab and Beam Bridges Under Ultimate Loads [microform] written by Yih, Jenn-Ching and published by National Library of Canada. This book was released on 1967 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-dependent Behavior of Noncomposite and Composite Post-tensioned Concrete Girder Bridges by : A. I. Fadl
Download or read book Time-dependent Behavior of Noncomposite and Composite Post-tensioned Concrete Girder Bridges written by A. I. Fadl and published by . This book was released on 1976 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement and Simplified Modeling Method of the Non-composite Deflections of Steel Plate Girder Bridges by :
Download or read book Measurement and Simplified Modeling Method of the Non-composite Deflections of Steel Plate Girder Bridges written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of today's bridge construction projects are erected in stages to limit traffic interruptions or to minimize environmental impacts. Typically, one half of the bridge superstructure is constructed in the first stage and the other half constructed in the second stage. The final stage is to cast a closure strip to join the deck slabs of the two structures together. Due to the inability of current analysis methods to accurately predict the non-composite dead load deflection for steel plate girder bridge during construction, three-dimensional finite element bridge models have been developed to more accurately predict the bridge behavior. However, the bridge engineer must first consider the complexity of and the time spent modeling bridges in this way. The objective of this research is to develop a simplified modeling method to predict the non-composite dead load deflections of the steel plate bridge girder. The study is focused on creating a modeling method for both single span and two-span continuous bridges. Parameters such as bridge skew, cross-frame stiffness, and stay-in-place metal deck forms were considered in the development of the simplified models. By measuring the deflections in the field during the construction, the true non-composite deflection behavior of the bridge was captured and compared to the results from modeling. As a result, the predicted deflection of the simplified models agreed well with the measured results for the single span bridges. Additionally, predicted deflections from the simplified models correlated well with the deflection results from finite element models for the single span bridges. However, the predicted deflections from the simplified models had a poor agreement with the measured results for the two-span continuous bridge. It was also concluded from both field measurements and modeling results that stay-in-place metal deck forms have a significant effect to the non-composite dead load deflection behavior for skewed steel plat.
Book Synopsis The Ultimate Load Behaviour of Composite Steel-concrete Bridge Deck Structures by : Vundela Malakonda Reddy
Download or read book The Ultimate Load Behaviour of Composite Steel-concrete Bridge Deck Structures written by Vundela Malakonda Reddy and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Load Rating of Skewed Steel Girder Highway Bridges by : Renxiang Lu
Download or read book Experimental Load Rating of Skewed Steel Girder Highway Bridges written by Renxiang Lu and published by . This book was released on 2020 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Skewed highway bridges are commonplace, but the behavior of a skewed bridge can be significantly more complex compared to a straight bridge. As a consequence, the theoretical equations currently used to determine the load rating of a skewed bridge can be inaccurate for a large skew angle because the location of the girder and the moment (positive or negative) under consideration, the arrangement and position of cross-frames and parapets, and the location of loading applied on the bridge are neglected. In this study, an accurate load rating method is proposed that accounts for these effects. In the proposed method, a field test is used to determine the safe load-carrying capacity of the bridge, and a two-dimensional grid with longitudinal and transverse beam elements rigidly connected at intersecting nodes and vertical loads applied at the nodes (“grillage”) model is used to calculate the contribution due to skew. The field test is conducted using a calibrated truck driven over the bridge in successive runs that traverse the entire width of the roadway, and the measured strain response is used to calculate internal moments and experimental live load effects. To compare the behaviors between the actual bridge and the analytical estimation, the ratio of the bridge experimental and analytical load ratings is obtained. Additionally, contributors to the bridge live load are decomposed and compared to the analytical load rating to obtain the bridge deaggregated ratio of load ratings. The effect of critical span adjustment, longitudinal and lateral load distribution, unintended composite action between the slab and the girders, slab flexure, and additional stiffness in the system on the ratio of load ratings are qualified and quantified. The contribution of additional stiffness in the system to the actual load rating in comparison to the analytical is further discretized into the contribution to stiffness due to skew and the contribution to stiffness due to curbs and railings. The contribution to stiffness due to skew is calculated as the ratio of the statical moment in the skewed bridge grillage model to the corresponding statical moment in the equivalent straight bridge. The proposed method is illustrated using a case study of a steel girder highway bridge with a 43-degree skew angle. The tests indicate that the experimental load rating is 156% greater than the analytical load rating at the positive moment location, and 11% greater at the negative moment location. The increased load rating is primarily due to unintended composite action. Since unintended composite action is not reliable for load-levels above the linear-elastic region, the effect of unintended composite action is removed, resulting in a reliable experimental rating load rating that is 46% greater than the analytical load rating at the positive moment location. The grillage model indicates that additional stiffness due to skew contributes to a 19% increase in the positive moment load rating. The case study demonstrates that the proposed method provides a more accurate determination of the skew effect, compared to the theoretical equations currently in use, because the location of the girder and moment under consideration, the arrangement and position of cross-frames and parapets, and the location of loading applied on the bridge are explicitly incorporated. Therefore, field testing coupled with a grillage model has the potential to effectively load rate skewed highway bridges.
Book Synopsis Behavior and Analysis of a Horizontally Curved and Skewed I-girder Bridge by : Cagri Ozgur
Download or read book Behavior and Analysis of a Horizontally Curved and Skewed I-girder Bridge written by Cagri Ozgur and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the strength behavior of a representative highly skewed and horizontally curved bridge as well as analysis and design procedures for these types of structures. The bridge responses at and above a number of limits in the AASHTO (2007) Specifications are considered. The study includes the evaluation of various attributes of the elastic analysis of the subject bridge. These attributes include: (1) the accuracy of 3-D grid versus 3-D FEA models, (2) first-order versus second-order effects during the construction, (3) the ability to predict layover at bearing lines using simplified equations and (4) the benefit of combining the maximum and concurrent major-axis and flange lateral bending values due to live load compared to combining the maximums due to different live loads when checking the section resistances. The study also addresses the ability of different AASHTO 2007 resistance equations to capture the ultimate strength behavior. This is accomplished by comparing the results from full nonlinear 3-D FEA studies to the elastic design and analysis results. Specifically the use of the 2007 AASHTO moment based one-third rule equations is evaluated for composite sections in positive bending.
Author :American Association of State Highway and Transportation Officials Publisher :AASHTO ISBN 13 :1560514698 Total Pages :38 pages Book Rating :4.5/5 (65 download)
Book Synopsis LRFD Guide Specifications for the Design of Pedestrian Bridges by : American Association of State Highway and Transportation Officials
Download or read book LRFD Guide Specifications for the Design of Pedestrian Bridges written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2009 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steel Bridges written by Manfred Hirt and published by CRC Press. This book was released on 2013-06-05 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This English translation of the successful French edition presents the conception and design of steel and steel-concrete composite bridges, from simple beam bridges to cable supported structures. The book focuses primarily on road bridges, emphasizing the basis of their conception and the fundamentals that must be considered to assure structural safety and serviceability, as well as highlighting the necessary design checks. The principles are extended in later chapters to railway bridges as well as bridges for pedestrians and cyclists. Particular attention is paid to consideration of the dynamic performance.
Book Synopsis Theory of Structures by : Peter Marti
Download or read book Theory of Structures written by Peter Marti and published by John Wiley & Sons. This book was released on 2013-03-20 with total page 997 pages. Available in PDF, EPUB and Kindle. Book excerpt: Das Werk liefert eine einheitliche Darstellung der Baustatik auf der Grundlage der Technischen Mechanik. Es behandelt Stab- und Flächentragwerke nach der Elastizitäts- und Plastizitätstheorie. Es betont den geschichtlichen Hintergrund und den Bezug zur praktischen Ingenieurtätigkeit und dokumentiert erstmals in umfassender Weise die spezielle Schule, die sich in den letzten 50 Jahren an der ETH in Zürich herausgebildet hat. Als Lehrbuch enthält das Werk viele durchgearbeitete Beispiele und Aufgaben zum vertieften Studium. Die einzelnen Kapitel werden durch Zusammenfassungen abgeschlossen, welche die wichtigsten Lehrinhalte in prägnanter Form hervorheben. Die verwendeten Fachausdrücke sind in einem Anhang definiert. Als Nachschlagewerk enthält das Buch ein umfassendes Stichwortverzeichnis. Die Gliederung des Inhalts und Hervorhebungen im Text erleichtern die Übersicht. Bezeichnungen, Werkstoff- und Querschnittswerte sowie Abrisse der Matrizenalgebra, der Tensorrechnung und der Variationsrechnung sind in Anhängen zusammengefasst. Insgesamt richtet sich das Buch als Grundlagenwerk an Studierende und Lehrende ebenso wie an Bauingenieure in der Praxis. Es bezweckt, seine Leser zu einer sinnvollen Modellierung und Behandlung von Tragwerken zu befähigen und sie bei den unter ihrer Verantwortung vorgenommenen Projektierungs- und Überprüfungsarbeiten von Tragwerken zu unterstützen.
Book Synopsis Precast Concrete Structures by : Alfred Steinle
Download or read book Precast Concrete Structures written by Alfred Steinle and published by John Wiley & Sons. This book was released on 2019-05-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building with precast concrete elements is one of the most innovative forms of construction. This book serves as an introduction to this topic, including examples, and thus supplies all the information necessary for conceptual and detailed design.
Download or read book Stacking the Deck written by Bruce Curtis and published by James Lorimer & Company. This book was released on 1992-01-01 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction Chapter One "So Many People": Ways of Seeing Class Differences in Schooling Chapter Two The Origins of Educational Inequality in Ontario Chapter Three Streaming in the Elementary School Chapter Four Streaming in the Secondary School Chapter Five Unstacking the Deck: A New Deal for Our Schools Abstract Bibliography
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