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Seismic Retro tting Guideline s for Complex Steel Truss Highway Bridges
Author: Tom Ho (Coordinating Author)1, Roupen Donikian1, Tim Ingham1, Chuck Seim2, and Austin Pan | Size: 12.1 MB | Format:PDF | Quality:Unspecified | Publisher: MULTIDISCIPLINARY CENTER FOR EARTHQUAKE ENGINEERING RESEARCH University at Buffalo, State University of New York | Year: June 30, 2006 | pages: 190
This manual, entitled Seismic Retrofitting Guidelines for Complex Steel Truss Highway Bridges (referred to as Guidelines in this document), collects and summarizes the state-of-the-practice, up to 2005, for retrofitting steel truss bridges on the highway system within the United States. These Guidelines are based on and are supplementary to the Seismic Retrofitting Manual for Highway Structures Part 1: Bridges (referred to in these Guidelines as the Bridge Retrofitting Manual), developed by the Multidisciplinary Center for Earthquake Engineering Research (MCEER), to be published by the Federal Highway Administration (FHWA) in 2006. The AASHTO Standard Specifications for Highway Bridges generally apply to the design of new “ordinary” highway bridges with spans less than 500 ft and with a design life of 75 years. The AASHTO Standard Specifications for Highway Bridges also suggest that supplemental specifications may be required for the design of new highway bridges of “unusual types,” or for the design of “long-span” bridges with spans longer than 500 ft. These two bridge classifications usually have design lives of 100 years or more.
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SEISMIC BEHAVIOUR OF CABLE-STAYED BRIDGES:DESIGN, ANALYSIS AND SEISMIC DEVICES
Author: Alfredo Cámara Casado | Size: 26.6 MB | Format:PDF | Quality:Unspecified | Publisher: Department of continuum mechanics and theory of structures | Year: Octob er 2011 | pages: 144
he so cial and economical imp ortance of long-span bridges is extremely large; cable- stayed bridges currently span distances ranging from 200 to even more than 1000 m, representing key p oints along infrastructure networks and requiring an outstanding knowledge of their seismic resp onse. The ob jective of the study is three-fold; (i) to discern how pro ject decisions aect the seismic b ehaviour of cable-stayed bridges; (ii) to shed light on appropriate analysis strategies in order to address their linear
and nonlinear dynamic resp onse; and (iii) to compare dierent control schemes with passive seismic devices disp osed along the towers.
The organization of the content follows a natural progression, starting with the motivation of the work and presenting the state of art on this topic, followed by the description of the framework where the research is develop ed; the studied structures
and the simplifying assumptions employed throughout the do cument are clearly de ned. Mo dal analysis of these bridges precedes the presentation of the seismic action and the validation of the accelerograms which have b een used. At this p oint, the discussion ab out the seismic results starts with a chapter completely devoted to the linear and nonlinear analysis pro cedures available to date, b eing followed by the comparison of the elastic and inelastic resp onse of cable-stayed bridges, fo cused
on the eect of dierent pro ject decisions. Finally, several control strategies with seismic devices are addressed in order to maintain the towers in the elastic range. The main conclusions are drawn to close the thesis, and new lines of research are suggested.
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This Material Specification covers provisions governing testing, evaluation, and acceptance of carbon and glass fiber-reinforced polymer (FRP) bars used as reinforcement for concrete.
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In the structural design of airframes and buildings, probability-based procedures are used to mitigate the risk of failure as well as produce cost-effective designs. This book introduces the subject of probabilistic analysis to structural and fire protection engineers and can also be used as a reference to guide those applying this technology.
In addition to providing an understanding of how fire affects structures and how to optimize the performance of structural framing systems, Probability-Based Structural Fire Load provides guidance for design professionals and is a resource for educators. The goal of this book is to bridge the gap between prescriptive and probability-based performance design methods and to simplify very complex and comprehensive computer analyses to the point that stochastic structural fire loads have a simple, approximate analytical expression that can be used in structural analysis and design on a day-to-day basis. Numerous practical examples are presented in step-by-step computational form.
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Practical Approximate Analysis of Beams and Frames: Lecture Notes in Mechanics 1
Author: Nabil Fares | Size: 6 MB | Format:PDF | Quality:Unspecified | Publisher: American Society of Civil Engineers | Year: 2012 | pages: 400 | ISBN: 0784412227, 9780784412220
Practical Approximate Analysis of Beams and Frames presents a new method for structural engineers to approximately analyze the mechanics of beams and frames. The approach, which complements the results produced by computer software, can be used to sketch deflected shapes and to estimate moment diagrams, deflections, influence lines, and moments of inertia, as well as to establish a framework for nondestructive evaluation of framed structures.
This method is relatively short and simple, robust with good accuracy, memorable, and applicable to practical problems. With this approximate analysis method, engineers sketch the deformations of beams and frames, with an emphasis on qualitative precision. The resulting sketches reveal the behavior of structures in a visually rich and informative way. One advantage of this method is that it localizes all dimensional quantities in a few factors, so that only relative stiffness parameters need to be estimated. Each chapter contains examples of this method applied to produce summaries and ranges of behavior in a wide variety of realistic situations. For practicing structural engineers, the methods in this book are an illuminating and time-saving addition to traditional computer calculations. For engineering students, these methods emphasize the conceptual aspects of mechanical analysis, supplementing their training in structural analysis software programs.
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The subject discussed in this book is the stability of thin-walled elastic systems under static loads. The presentation of these problems is based on modern approaches to elastic-stability theory. Special attention is paid to the formulation of elastic-stability criteria, to the statement of column, plate and shell stability problems, to the derivation of basic relationships, and to a discussion of the boundaries of the application of analytic relationships. The author has tried to avoid arcane, nonstandard problems and elaborate and unexpected solutions, which bring real pleasure to connoisseurs, but confuse students and cause bewilderment to some practical engineers. The author has an apprehension that problems which, though interesting, are limited in application can divert the reader's attention from the more prosaic but no less sophisticated general problems of stability theory.
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This book is the consequence of research undertaken by the authors in the field of advanced problems of structural mechanics. Stability analysis of structures comes under this area because of the complex models and computational methods needed for analysis. In the mid seventies, a joint effort began between a group of researchers and teachers of the Department of Civil Engineering and Computer Center of the Cracow University of Technology. One of the important results of the collaboration has been this publication.
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