Download or read book Economical Designing of Timber Trestle Bridges written by A. L. Johnson and published by . This book was released on 1896 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Economical Designing of Timber Trestle Bridges written by A. L. Johnson and published by . This book was released on 1902 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Economical Designing of Timber Trestle Bridges written by A. L. Johnson and published by Palala Press. This book was released on 2015-09 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book ECONOMICAL DESIGNING OF TIMBER written by A. L. Johnson and published by Wentworth Press. This book was released on 2016-08-25 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Economical Desiging Timber Trestle Bridges Classic Reprint written by A. L. Johnson and published by Forgotten Books. This book was released on 2017-10-13 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Economical Desiging Timber Trestle Bridges There are in the United States at least miles of timber trestle representing an expenditure of more than These have to be entirely replaced every nine years, on the average, making an annual expenditure of about which, capitalized at 4 per cent, gives an invested capital of $17 necessary to maintain these structures, consuming annually about feet, B. M., of timber, nearly all of it being in large sizes, very valuable for other purposes. Any economy effected, upon however small a margin it is based, is therefore, when multiplied so enormously, of great benefit not only to the railroad companies but to our national forestry interests. The capital invested in timber structures is greatly in excess (proba bly twice as much) of that invested in structures of iron and steel. Every piece in these latter structures is thoroughly inspected, both chemically and physically, and carefully designed to carry the imposed load. Timber structures, on the other hand, have been designed according to the general principal that the Lord takes care of His own, as the great number of fatalities resulting from failures of these strue tures will attest. Experience is not only a dear teacher, but requires endless time to tell What he knows. That this time has not yet expired is evidenced by the anachronisms of design existing in the present practice. It is a well-known principle that a chain is no stronger than its weakest link, and therefore, having one weak link, it is unnecessary that the others should be any stronger. Yet there are thousands of timber structures throughout this country to-day that have, in some parts, barely sufficient strength to carry their working load (with a factor of safety of only 1 - see table on pages 9 and while other por tions of the same structure have from twenty to thirty times this strength. The engineer who would design an iron structure in such a manner would be the laughing stock of the most ignorant man in the profession. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Principles of Economy in the Design of Metallic Bridges written by Charles B. Bender and published by . This book was released on 1884 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Treatise on Wooden Trestle Bridges and Their Concrete Substitutes written by Wolcott Cronk Foster and published by . This book was released on 1913 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Timber Bridges written by Michael A. Ritter and published by . This book was released on 1990 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a comprehensive analysis of the design, construction, inspection, and maintenance of timber bridges.
Download or read book Bridge Design for Economy and Durability written by Brian Pritchard and published by Thomas Telford. This book was released on 1992 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes several bridging concepts, which were developed and successfully applied during the author's forty years of close involvement with UK and international bridge design, construction, maintenance and research. The concepts mainly apply to the small/medium span range of bridges and viaducts.
Download or read book The Timberman written by and published by . This book was released on 1916 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Timber Bridge Economics written by and published by . This book was released on 2001 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Engineer and Railroad Journal written by and published by . This book was released on 1896 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Timber Bridges written by Michael A. Ritter and published by . This book was released on 2005 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Timber's strength, light weight, and energy-absorbing properties furnish features desirable for bridge construction. Timber is capable of supporting short-term overloads without adverse effects. Contrary to popular belief, large wood members provide good fire resistance qualities that meet or exceed those of other materials in severe fire exposures. From an economic standpoint, wood is competitive with other materials on a first-cost basis and shows advantages when life cycle costs are compared. Timber bridges can be constructed in virtually any weather conditions, without detriment to the material. Wood is not damaged by continuous freezing and thawing and resists harmful effects of de-icing agents, which cause deterioration in other bridge materials. Timber bridges do not require special equipment for installation and can normally be constructed without highly skilled labor. They also present a natural and aesthetically pleasing appearance, particularly in natural surroundings. The misconception that wood provides a short service life has plagued timber as a construction material. Although wood is susceptible to decay or insect attack under specific conditions, it is inherently a very durable material when protected from moisture. Many covered bridges built during the 19th century have lasted over 100 years because they were protected from direct exposure to the elements. In modem applications, it is seldom practical or economical to cover bridges; however, the use of wood preservatives has extended the life of wood used in exposed bridge applications. Using modem application techniques and preservative chemicals, wood can now be effectively protected from deterioration for periods of 50 years or longer. In addition, wood treated with preservatives requires little maintenance and no painting. Another misconception about wood as a bridge material is that its use is limited to minor structures of no appreciable size. This belief is probably based on the fact that trees for commercial timber are limited in size and are normally harvested before they reach maximum size. Although tree diameter limits the size of sawn lumber, the advent of glued-laminated timber (glulam) some 40 years ago provided designers with several compensating alternatives. Glulam, which is the most widely used modem timber bridge material, is manufactured by bonding sawn lumber laminations together with waterproof structural adhesives. Thus, glulam members are virtually unlimited in depth, width, and length and can be manufactured in a wide range of shapes. Glulam provides higher design strengths than sawn lumber and provides better utilization of the available timber resource by permitting the manufacture of large wood structural elements from smaller lumber sizes. Technological advances in laminating over the past four decades have further increased the suitability and performance of wood for modern highway bridge applications.
Download or read book The Indian Forester written by and published by . This book was released on 1896 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin United States Division of Forestry written by and published by . This book was released on 1896 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by United States. Forest Service and published by . This book was released on 1894 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Railroad Construction written by Walter Loring Webb and published by . This book was released on 1901 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
