Download or read book 0 6785 Extending Use of Elastomeric Bearings to Higher demand Applications written by Todd Aaron Helwig and published by . This book was released on 2015 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extending Use of Steel laminated Elastomeric Bearings to Higher Demand Applications written by Konstantinos Victor Belivanis and published by . This book was released on 2015 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Expanding the Use of Elastomeric Bearings for Higher Demand Applications written by Konstantinos Victor Belivanis and published by . This book was released on 2017 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elastomeric bearings have been widely used in short-span bridge systems as they provide a reliable and cost-effective means of accommodating translations compared to the pot bearing alternatives. However, in higher demand applications pot and disk bearings are commonly used to accommodate significant forces and rotations and complex bridge movements from both thermal loads and daily truck traffic. Although elastomeric bearings have been designed for and utilized in twin steel trapezoidal box girder systems in Texas, classifying as higher demand applications, the lack of experimental and numerical research on such bearings, as well as some occasions of poor performance, dictate the need of further investigating their design requirements and performance. The research presented in this dissertation is part of a broader research project including material-level studies, field monitoring of bridge bearings, large-scale experimental testing, and finite element simulations. This dissertation focuses on the large-scale experimental testing and investigates the effect of several parameters on the compression and shear stiffness of elastomeric bearings. Specifically, bearing tests demonstrated the poor prediction ability current AASHTO axial stiffness prediction equations as well as a shear stiffness dependence on the level of axial load and, in some cases, on the shearing direction of the bearing. However, it was shown that both AASHTO Method A and B produce safe elastomeric bearing designs. The finite element studies demonstrated that shim misalignment and cover friction can cause a reduction in the axial stiffness of an elastomeric bearing. In addition, an extensive finite element parametric study was performed to show variations in elastomeric bearings shear stiffness with different axial loads and shearing directions with a wide range of aspect ratios and height to width ratios.
Download or read book Elastomeric Bearings in High Demand Applications written by Liwei Han and published by . This book was released on 2016 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pot and disk bearings are typically used in high-demand bridge applications where significant demands are imposed on bearings at the supports to accommodate rotations and complex bridge movements from both environmental thermal loads and vehicular traffic. However, past bridge research, design, and installation experience demonstrates that less costly elastomeric bearings are not only easy to install, inspect, and replace, but also more forgiving of installation errors. The use of elastomeric bearings in high-demand applications results in much less structural restraint against bridge thermal deformation than other more sophisticated sliding bearings. Although past bridge design practice includes applications of elastomeric bearings in two steel trapezoidal box girder systems in Central Texas, the use of elastomeric bearings in high-demand application is nevertheless largely impeded by historical and current bearing design provisions at national and state levels that are unduly restrictive for large-sized elastomeric bearings as well as the scantiness of field, laboratory, and numerical investigations on them. This investigation reported in this dissertation is part of a research project including material study, full-scale testing, field monitoring, and finite-element studies, with a focus primarily on finite-element studies of elastomeric bearings in comparison with laboratory and field measurements. A three-dimensional finite-element model capable of simulating the behavior of elastomeric bearings in full-scale compression, shear, and rotation testing was first developed and validated by experimental results from the full-scale testing. More comprehensive parametric finite-element studies of elastomeric layers under axial load and rotational deformation were then carried out leading to the development of a reliable elastomeric bearing design with improved economy and serviceability, based on total shear strain approach. A three-dimensional finite-element study of a continuous curved steel trapezoidal box girder system (IH-35 NB & US-290 EB direct connector) was carried out to investigate the translational movements and rotations imposed on elastomeric bearings under thermal loads with 100-year return period, and validated by instrumentation measurements from field monitoring. Design suggestions were put forward with regard to determining demands on elastomeric bearing s under thermal loads in high-demand applications. A field investigation was finally carried out on elastomeric bearings on the instrumented bridge, two of which were found to be damaged to different extents. The results reveal that the two damaged bearings are subjected to excessive amount of transverse rotation. Further analyses by calculating the maximum shear strain of all bearings using the proposed design approach confirmed that the observed bearing damage is the direct result of the excessive transverse angle of inclination on the concrete bearing seat surface.
Download or read book Comprehensive Coordination Chemistry II written by J. A. McCleverty and published by Newnes. This book was released on 2003-12-03 with total page 11845 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.
Download or read book Operation and Maintenance Manual for Electrostatic Precipitators written by and published by . This book was released on 1985 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Norms and Agency written by Ana María Muñoz Boudet and published by World Bank Publications. This book was released on 2013-04-25 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on focus groups and interviews with nearly 4,000 women, men, girls, and boys from 20 countries, this book explores areas that are less often studied in gender and development: gender norms and agency. It reveals how little gender norms have changed, how similar they are across countries, and how they are being challenged and contested.
Download or read book Corneal Regeneration written by Jorge L. Alió and published by Springer. This book was released on 2019-02-20 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides expert instruction on the varying surgical techniques currently employed for the regeneration of the ocular surface. Corneal Regeneration: Therapy and Surgery begins with a thorough discussion of current research based on data obtained in clinical human studies, and discusses the potential clinical implications for this promising new stage of eye surgery. Sections devoted to the stem cell, regenerative surgery and therapy of the ocular surface epithelium, corneal stroma, and corneal endothelium follow, each section comprehensively covering applied anatomy, current therapy and regenerative techniques, with a look to future directions of the field including eventual cell therapy. Corneal Regeneration: Therapy and Surgery is the first book of its kind, systematically covering the developments the medical community has achieved in corneal regeneration from all angles. Written and edited by leading experts in the field, researchers and ophthalmologists alike will find this to be a unique source of information on corneal regeneration, as well as a thoughtful reflection on potential applications of regenerative surgery in ophthalmology as a whole.
Download or read book Surgical Robotics written by Jacob Rosen and published by Springer Science & Business Media. This book was released on 2011-01-15 with total page 827 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surgical robotics is a rapidly evolving field. With roots in academic research, surgical robotic systems are now clinically used across a wide spectrum of surgical procedures. Surgical Robotics: Systems Applications and Visions provides a comprehensive view of the field both from the research and clinical perspectives. This volume takes a look at surgical robotics from four different perspectives, addressing vision, systems, engineering development and clinical applications of these technologies. The book also: -Discusses specific surgical applications of robotics that have already been deployed in operating rooms -Covers specific engineering breakthroughs that have occurred in surgical robotics -Details surgical robotic applications in specific disciplines of surgery including orthopedics, urology, cardiac surgery, neurosurgery, ophthalmology, pediatric surgery and general surgery Surgical Robotics: Systems Applications and Visions is an ideal volume for researchers and engineers working in biomedical engineering.
Download or read book Insurgent Citizenship written by James Holston and published by Princeton University Press. This book was released on 2021-06-08 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Insurgent citizenships have arisen in cities around the world. This book examines the insurgence of democratic citizenship in the urban peripheries of São Paulo, Brazil, its entanglement with entrenched systems of inequality, and its contradiction in violence. James Holston argues that for two centuries Brazilians have practiced a type of citizenship all too common among nation-states--one that is universally inclusive in national membership and massively inegalitarian in distributing rights and in its legalization of social differences. But since the 1970s, he shows, residents of Brazil's urban peripheries have formulated a new citizenship that is destabilizing the old. Their mobilizations have developed not primarily through struggles of labor but through those of the city--particularly illegal residence, house building, and land conflict. Yet precisely as Brazilians democratized urban space and achieved political democracy, violence, injustice, and impunity increased dramatically. Based on comparative, ethnographic, and historical research, Insurgent Citizenship reveals why the insurgent and the entrenched remain dangerously conjoined as new kinds of citizens expand democracy even as new forms of violence and exclusion erode it. Rather than view this paradox as evidence of democratic failure and urban chaos, Insurgent Citizenship argues that contradictory realizations of citizenship characterize all democracies--emerging and established. Focusing on processes of city- and citizen-making now prevalent globally, it develops new approaches for understanding the contemporary course of democratic citizenship in societies of vastly different cultures and histories.
Download or read book Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and published by . This book was released on 1989 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Handbook for Mechanical Engineers written by and published by . This book was released on 1923 with total page 1874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inorganic Polyphosphates written by Heinz C. Schröder and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inorganic polyphosphates - polymers of orthophosphate linked by high-energy phosphoanhydride bonds - have been found in apparently all forms of life, from bacteria, yeasts and fungi to higher plants and animals. These polymers, which had been neglected for a long time, have become a fascinating area of research in the last few years. This volume summarizes the present state of knowledge about the metabolism and function of inorganic polyphosphates. In addition, the methods to study these polymers as well as the biotechnological applications of inorganic polyphosphates are described. The 15 chapters of this volume, dealing with different aspects of polyphosphate research, are written by experts in the field. This book represents a valuable source of information not only for researchers working on this subject, but also for scientists interested in fundamental aspects of cell and energy metabolism.
Download or read book Space Microelectronics written by and published by . This book was released on 1997 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Topographical Surveying written by Herbert Michael Wilson and published by . This book was released on 1900 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investment Valuation written by Aswath Damodaran and published by John Wiley & Sons. This book was released on 2002-01-31 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt: Valuation is a topic that is extensively covered in business degree programs throughout the country. Damodaran's revisions to "Investment Valuation" are an addition to the needs of these programs.
Download or read book Hydrogels in Medicine and Pharmacy written by Nikolaos A. Peppas and published by CRC Press. This book was released on 2019-08-15 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 1986, this book offers a full, comprehensive guide to the application of hydrogels in medicine. Carefully compiled and filled with a vast repertoire of notes, diagrams, and references this book serves as a useful reference for students of medicine and other practitioners in their respective fields.
