Download or read book A Study of Manufacturable Rib to Floor Beam Connections in Steel Orthotropic Bridge Decks written by Katelyn Kitner and published by . This book was released on 2016 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-level 3D linear elastic finite element analyses (FEA) were performed using a model of a steel orthotropic deck integrated with steel box girders developed in a previous study. Additional submodels were developed with variations of the rib-to-floor beam connections and floor beam depths. The response of the critical rib-to-floor beam connection, under critical symmetric and eccentric loading conditions, with respect to the FB, was analyzed under the rear axle loads of an AASHTO fatigue truck to assess the fatigue performance of the critical rib-to-floor beam connection.

Download or read book Fatigue Investigation of Slit Rib to floor Beam Connections in Steel Orthotropic Bridge Decks written by Jayne Marks and published by . This book was released on 2018 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The steel orthotropic bridge deck (SOBD) is a bridge deck system which consists of longitudinal open or closed ribs that pass through transverse floor beams with a continuous steel deck plate on top. All of these components are joined using welded connections which can be costly to fabricate and prone to fatigue cracks. The rib-to-floor beam (RFB) connection in an SOBD is labor intensive and fatigue sensitive. In the past, the RFB connection has either been a fully fitted connection or a connection with an extended cut-out which is larger than the opening in the floor beam web for the rib to pass through. A third RFB detail that includes an additional opening below the rib bottom, which is not an extension of the rib opening, has been proposed and is studied herein. This connection, termed a "slit RFB connection," is similar to the fitted connection with closed, U-shaped ribs passing continuously through matching openings in the floor beam webs, but an additional opening contained entirely within the floor beam web allows for relatively unrestrained out-of-plane rib rotation. The slit RFB connection has not been used or studied previously, and shows potential for efficient, automated fabrication and good fatigue performance.

Download or read book Fatigue Resistant Rib to floor Beam Connections for Orthotropic Steel Decks with Potential Automated Fabrication written by and published by . This book was released on 2019 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Maintenance Safety Management Life Cycle Sustainability and Innovations written by Hiroshi Yokota and published by CRC Press. This book was released on 2021-04-20 with total page 926 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations contains lectures and papers presented at the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), held in Sapporo, Hokkaido, Japan, April 11–15, 2021. This volume consists of a book of extended abstracts and a USB card containing the full papers of 571 contributions presented at IABMAS 2020, including the T.Y. Lin Lecture, 9 Keynote Lectures, and 561 technical papers from 40 countries. The contributions presented at IABMAS 2020 deal with the state of the art as well as emerging concepts and innovative applications related to the main aspects of maintenance, safety, management, life-cycle sustainability and technological innovations of bridges. Major topics include: advanced bridge design, construction and maintenance approaches, safety, reliability and risk evaluation, life-cycle management, life-cycle sustainability, standardization, analytical models, bridge management systems, service life prediction, maintenance and management strategies, structural health monitoring, non-destructive testing and field testing, safety, resilience, robustness and redundancy, durability enhancement, repair and rehabilitation, fatigue and corrosion, extreme loads, and application of information and computer technology and artificial intelligence for bridges, among others. This volume provides both an up-to-date overview of the field of bridge engineering and significant contributions to the process of making more rational decisions on maintenance, safety, management, life-cycle sustainability and technological innovations of bridges for the purpose of enhancing the welfare of society. The Editors hope that these Proceedings will serve as a valuable reference to all concerned with bridge structure and infrastructure systems, including engineers, researchers, academics and students from all areas of bridge engineering.

Download or read book Laboratory Fatigue Evaluation of a Full Scale Steel Orthotropic Bridge Deck with Round Bottom Ribs and Fitted Floor Beams written by Soham Mukherjee and published by . This book was released on 2016 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue testing was run-out at 8 million cycles without any detectable fatigue cracking in the deck. The measured stress ranges at all critical connections were less than the CAFT of their respective detail categories. The test results would indicate infinite life performance of the rib-to-floor beam connection detail of the proposed deck design, as long as the site specific overloads do not exceed the AASHTO Fatigue I limit state load more than 1 in 10000 occurrences. The test results also demonstrated that the large deviation from the specified fabrication tolerances and the rejected welding procedures, which were noted during the specimen fabrication and installation, did not affect the fatigue resistance of the connection details. This suggests that the specified fabrication tolerances are arbitrary. In addition, the study provided critical information on issues related to fabrication and installation of the proposed orthotropic deck design for the lift bridge.

Download or read book Assessment of Trough to Crossbeam Connections in Orthotropic Steel Bridge Decks written by C. Beales and published by . This book was released on 1990 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Manual for Orthotropic Steel Plate Deck Bridges written by American Institute of Steel Construction and published by . This book was released on 1963 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in Composite Design of Steel Beam and Concrete Bridge Decks written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1958 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Orthotropic Bridges Theory and Design written by M. S. Troitsky and published by . This book was released on 1967 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fabrication Procedure Effects on Fatigue Resistance of Rib to deck Welded Joints of Steel Orthotropic Bridge Decks written by Hyoung-Bo Sim and published by . This book was released on 2010 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthotropic steel bridge decks have been widely used for long- and medium-span bridges due to excellent structural characteristics. However, orthotropic decks have experienced various fatigue problems, resulting from high cyclic stresses in conjunction with inadequate welding details. In particular, crack at rib-to-deck welded joints due to wheel load is a concern because inspection and repair of the back side of this weld for closed ribs is not practical due to lack of access. Fatigue resistance of rib-to-deck joints can be significantly influenced by fabrication effects including weld melt-through and distortion control measures (for example, precambering and heat-straightening). Current design practice is to use empirical approach for fatigue safety assessments by conforming to the detailing requirements [for example, at least 80% partial-joint-penetration (PJP) weld at the rib-to-deck joint]. However, little experimental and analytical research has been done as to the code-specified requirements and fabrication procedure effects on the fatigue resistance of the PJP joint. Six 2-span, full-scale orthotropic steel deck specimens (10 m long by 3 m wide) were fabricated and subjected to 8 million loading cycles to study the effects of both weld melt-through and distortion control measures on the fatigue resistance of the PJP joint. Test results showed that six cracks initiated from the weld toe outside the closed rib. Only one crack developed at the weld root inside the rib; this crack initiated from a location transitioning from the 80% PJP to 100% penetration. Weld melt-through appeared to be detrimental in fatigue resistance. Precambering was beneficial as two effectively precambered specimens did not experience cracking in the PJP welds. Finite element analysis using effective notch stress method showed a good correlation with the observed crack pattern in testing. Bending stresses were dominant at the PJP joint ; shear and membrane stresses were very small. Parametric study showed that the fatigue resistance of the PJP joint can be significantly influenced by transverse loading location, deck plate thickness, and weld penetration ratio. Increasing the deck plate thickness was efficient in reducing the stresses, while the rib plate thickness had a little effect. Shallower weld penetration at the PJP joint appeared to have a positive effect in enhancing the fatigue resistance.

Download or read book Optimization of Rib to deck Welds for Steel Orthotropic Bridge Decks written by J.M. Ocel and published by . This book was released on 2017 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthotropic steel decks have been widely used over the decades, especially on long-span bridges as a result of their lightweight and fast construction. However, fatigue cracking problems have been observed in the welds in many cases because of wheel loads. The rib-to-deck welds need special care because they are directly located under wheel loads and are subjected to both local and global stress effects. When this research began, the current practice in the United States was to use a one-sided partial penetration weld joining the rib and deck plates together with a minimum of 80-percent penetration requirement. Melt-through and blow were also considered rejectable defects. Restrictive requirements such as these result in a very narrowly defined welding procedure with little tolerance for variation. In practice, this leads to numerous weld repairs and rigorous inspection requirements that drive up the cost of orthotropic deck fabrication. This study shows that the 80-percent penetration requirement can be significantly relaxed because fatigue performance was largely dictated by weld size and not penetration. A simple correlation is provided between weld size and penetration to guarantee American Association of State and Highway Transportation Officials category C fatigue performance that should provide for more relaxed fabrication specifications. Finally, specimens fabricated with purposeful fit-up gaps were found to close provided the original gap did not exceed 0.020 inch.

Download or read book Fatigue Behaviour of Closed Stiffener to Crossbeam Connections in Orthotropic Steel Bridge Decks written by Johan Sebastiaan Leendertz and published by . This book was released on 2008 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Orthotropic Bridge Decks Using Bethlehem Standard Ribs written by and published by . This book was released on 1970* with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in Composite Design of Steel Beams and Concrete Bridge Decks written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fibrous Composites in Structural Design written by Edward M. Lenoe and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Fourth Conference on Fibrous Composites in Structural Design was a successor to the First-to-Third Conferences on Fibrous Composites in Flight Vehicle Design sponsored by the Air Force (First and Second Conferences, September 1973 and May 1974) and by NASA (Third Conference, November 1975) which were aimed at focusing national attention on flight vehicle applications of a new class of fiber reinforced materials, the advanced com posites, which afforded weight savings and other advantages which had not been previously available. The Fourth Conference, held at San Diego, California, 14-17 November 1978, was the fi rst of these conferences to be jointly sponsored by the Army, Navy and Ai r Force together with NASA, as well as being the first to give attention to non-aerospace applications of fiber reinforced composites. While the design technology for aerospace applications has reached a state of relative maturity, other areas of application such as mi litary bridging, flywheel energy storage systems, ship and surface vessel components and ground vehicle components are in an early stage of development, and it was an important objective to pinpoint where careful attention to structural design was needed in such applications to achfeve maximum structural performance payoff together with a high level of reliability and attractive economics.

Download or read book Optimum Design of Steel Structures written by József Farkas and published by Springer Science & Business Media. This book was released on 2013-03-29 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book helps designers and manufacturers to select and develop the most suitable and competitive steel structures, which are safe, fit for production and economic. An optimum design system is used to find the best characteristics of structural models, which guarantee the fulfilment of design and fabrication requirements and minimize the cost function. Realistic numerical models are used as main components of industrial steel structures. Chapter 1 containts some experiences with the optimum design of steel structures Chapter 2 treats some newer mathematical optimization methods. Chapter 3 gives formulae for fabrication times and costs. Chapters 4 deals with beams and columns. Summarizes the Eurocode rules for design. Chapter 5 deals with the design of tubular trusses. Chapter 6 gives the design of frame structures and fire-resistant design rules for a frame. In Chapters 7 some minimum cost design problems of stiffened and cellular plates and shells are worked out for cases of different stiffenings and loads. Chapter 8 gives a cost comparison of cylindrical and conical shells. The book contains a large collection of literatures and a subject list and a name index.

Download or read book Design and Analysis of Composite Structures written by Christos Kassapoglou and published by John Wiley & Sons. This book was released on 2011-07-05 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Analysis of Composite Structures enables graduate students and engineers to generate meaningful and robust designs of complex composite structures. Combining analysis and design methods for structural components, the book begins with simple topics such as skins and stiffeners and progresses through to entire components of fuselages and wings. Starting with basic mathematical derivation followed by simplifications used in real-world design, Design and Analysis of Composite Structures presents the level of accuracy and range of applicability of each method. Examples taken from actual applications are worked out in detail to show how the concepts are applied, solving the same design problem with different methods based on different drivers (e.g. cost or weight) to show how the final configuration changes as the requirements and approach change. Provides a toolkit of analysis and design methods to most situations encountered in practice, as well as analytical frameworks and the means to solving them for tackling less frequent problems. Presents solutions applicable to optimization schemes without having to run finite element models at each iteration, speeding up the design process and allowing examination of several more alternatives than traditional approaches. Includes guidelines showing how decisions based on manufacturing considerations affect weight and how weight optimization may adversely affect the cost. Accompanied by a website at www.wiley.com/go/kassapoglou hosting lecture slides and solutions to the exercises for instructors.