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Author: Wallace E. Eslyn
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 42
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Book Description
Author: Wallace E. Eslyn
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 42
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Book Description
Author: Nick Wood
Publisher:
ISBN: 9781910935125
Category : Fiction
Languages : en
Pages : 218
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Book Description
A tense SF thriller set in an alternative South Africa where apartheid still holds sway and the struggle for equality continues. Sibisuso, an AmaZulu unwittingly caught up in the conflict, and Martin, a white psychologist, find their fates entwined via a machine that might just change the world...
Author: Denis Gardner
Publisher: U of Minnesota Press
ISBN: 081664666X
Category : History
Languages : en
Pages : 238
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Book Description
Like never before we are aware of the crucial place of bridges in our lives. The spans that warranted little notice are now at the forefront of public and political debate and we are reminded of the rich history-and the uncertain future-of bridging in Minnesota. Historian Denis P. Gardner documents and celebrates a wide range of the state’s rural and urban spans, telling the remarkable stories of their construction and impact on Minnesota life and culture. From Pratt trusses to bowstring arches, Wood, Concrete, Stone, and Steel describes nearly every bridge type found in Minnesota, including railroad spans, and features more than 225 illustrations of historical and extant bridges. Gardner details the development of engineering and construction innovations (complete with a guide to trusses) and traces the fascinating politics and personalities behind the task of creating and maintaining safe, and often beautiful, crossings. Through arresting photographs and lively narrative, Gardner makes a compelling argument for the value of preserving our bridges and the cultural heritage they carry and brings to life their importance in Minnesota’s past, present, and future. Denis P. Gardner is an award-winning historian who has documented properties for the National Register of Historic Places and the Historic American Engineering Record. He is the author of Minnesota Treasures: Stories behind the State’s Historic Places. Eric DeLony is former director of the Historic American Engineering Record.
Author: Chiara Tardini
Publisher: Springer Science & Business Media
ISBN: 3319002872
Category : Science
Languages : en
Pages : 98
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Book Description
Early applications of Navier’s beam theory to the rational design of structures are documented in the Annales of the French Ecole des Ponts et Chaussées and refer to the design of three wooden bridges built in France in the 1840's. Revisiting these examples, the book provides documentation on the progressive establishment of the new design approach, based on the theory of structural mechanics rather than empirical knowledge. The bridges concerned were built according to the structural scheme patented by Ithiel Town in the USA, witnessing the diffusion in Europe of the American advancements in bridge design, circulated by the travel reports of French engineers from the Ecole. Through the exam of French treatises discussing the progress of theoretical formulations in parallel with experimental findings in the 18th and 19th centuries, the book retraces as well the long path which led to the formulation of Navier’s theory. The relevant scientific debate dealt mainly with the specific case of wood bridges; the text outlines a brief history of bridges built in the Alpine area at the time, based on unpublished iconographic materials from various European archives.
Author: Kenneth M. Brooks
Publisher:
ISBN:
Category : Wood preservatives
Languages : en
Pages : 108
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Book Description
Timber bridges provide an economical alternative to concrete and steel structures, particularly in rural areas with light to moderate vehicle traffic. Wooden components of these bridges are treated with chromated copper arsenate type C (CCA), pentachlorophenol, or creosote to prolong the life of the structure from a few years to many decades. This results in reduced transportation infrastructure costs and increased public safety. However, the preservative used to treat the wooden components in timber bridges is lost to the environment in small amounts over time. This report describes the concentration of wood preservatives lost to adjacent environments and the biological response to these preservatives as environmental contaminants. Six bridges from various states were examined for risk assessment: two creosote treated bridges, two pentachlorophenol-treated bridges, and two CCA-treated bridges. In all cases, the largest bridges located in biologically active environments associated with slow-flowing water were selected to represent worst-case analyses. Sediment and water column concentrations of preservative were analyzed upstream from, under, and downstream from each bridge. The observed levels of contaminant were compared with available regulatory standards or benchmarks and with the quantitative description of the aquatic invertebrate community sampled from vegetation and sediments. Pentachlorophenol- and creosote-derived polycyclic aromatic hydrocarbons (PAHs) were not observed in the water near any of the selected bridges. However, low levels of PAHs were observed in the sediments under and immediately downstream from these bridges. Pentachlorophenol concentrations did not approach toxicological benchmarks. Sediment concentrations of naphthalene, acenaphthylene, and phenanthrene exceeded the probable effect level. Metal levels at the bridges treated with CCA were less than predicted effect levels, in spite of questionable construction practices. Adverse biological effects were not observed in the aquatic invertebrate community or laboratory bioassays conducted on water and sediments sampled at each of the bridges. Results of this study reveal the need to follow the construction information found in Best Management Practices for the Use of Treated Wood In Aquatic Environments published by Western Wood Preservers Institute. Regulatory benchmarks used in risk assessments of this type need to be indexed to local environmental conditions. The robust invertebrate communities associated with slow-moving streams over soft bottoms were not susceptible to the concentrations of PAHs that would be expected to affect more sensitive taxa, which typically are located in faster moving water over hard bottoms. Contaminants released from timber bridges into these faster systems (where more sensitive taxa are located) are significantly diluted and not found at biologically significant levels.
Author: Robert L. Smith
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 48
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Book Description
Author: Alex C. Wiedenhoeft
Publisher:
ISBN:
Category : Covered bridges
Languages : en
Pages : 100
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Book Description
Author: Zhongfu Xiang
Publisher: Springer Nature
ISBN: 9819928788
Category : Technology & Engineering
Languages : en
Pages : 314
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Book Description
The book takes time as the axis, selecting 98 bridges (or bridge groups) across the country and 7 representative bridges out of the country, reflecting the steps and development of China's bridge construction in related majors and engineering technicians in colleges and universities. This book aims to let the general public understand the arduous history of China's bridge construction and the rapid development of China's bridge construction without the country's economic development, strength, and hard work of the bridge people. It is also hoped that the public will enjoy the convenience of bridges, highways, railroads, and urban roads and at the same time enhance their awareness of bridge knowledge, knowledge, love, and scientific use of bridges. This book is used by the general public to understand the development of China's bridge construction, but also as a reference book for teachers and students of bridge engineering-related majors and engineering technicians in colleges and universities.
Author: Michael A. Ritter
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 980
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Book Description
Author: Baidar Bakht
Publisher: Springer
ISBN: 3319178431
Category : Technology & Engineering
Languages : en
Pages : 434
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Book Description
This book offers a valuable guide for practicing bridge engineers and graduate students in structural engineering; its main purpose is to present the latest concepts in bridge engineering in fairly easy-to-follow terms. The book provides details of easy-to-use computer programs for: · Analysing slab-on-girder bridges for live load distribution. · Analysing slab and other solid bridge components for live load distribution. · Analysing and designing concrete deck slab overhangs of girder bridges under vehicular loads. · Determining the failure loads of concrete deck slabs of girder bridges under concentrated wheel loads. In addition, the book includes extensive chapters dealing with the design of wood bridges and soil-steel bridges. Further, a unique chapter on structural health monitoring (SHM) will help bridge engineers determine the actual load carrying capacities of bridges, as opposed to their perceived analytical capacities. The chapter addressing structures made with fibre-reinforced polymers will allow engineers to design highly durable, economical and sustainable structures. This chapter also provides guidance on rehabilitating deteriorated structures with these new materials. The book also deals with the philosophy of bridge design without resorting to complex equations. Additional material to this book can be downloaded from http://extras.springer.com
