Author: Publisher:
ISBN:
Category : Industrialists
Languages : en
Pages : 362
Book Description
Kentucky Directory of Manufacturers
Author: National Union Catalog
Author: Publisher:
ISBN:
Category : Union catalogs
Languages : en
Pages : 616
Book Description
Includes entries for maps and atlases.
The Southern Appalachians
Author: Susan L. YarnellPublisher: DIANE Publishing
ISBN: 1428953736
Category : Agriculture
Languages : en
Pages : 52
Book Description
Timber Bridges
Author: Michael A. RitterPublisher:
ISBN: 9781410221919
Category : Technology & Engineering
Languages : en
Pages : 500
Book Description
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.
Handbook of Biomass Downdraft Gasifier Engine Systems
Author: Thomas B. ReedPublisher: Biomass Energy Foundation
ISBN: 9781890607005
Category : Science
Languages : en
Pages : 160
Book Description
Toxicological Profile for Polycyclic Aromatic Hydrocarbons
Author: Publisher:
ISBN:
Category : Polycyclic aromatic hydrocarbons
Languages : en
Pages : 500
Book Description
Who's who in Finance and Industry
Author: The National union catalog, 1968-1972
Author: The National Union Catalogs, 1963-
Author: Kentucky
Author: Federal Writers' Project of the Work Projects Administration for the State of KentuckyPublisher:
ISBN:
Category : Automobile travel
Languages : en
Pages : 630
Book Description
During the Great Depression of the 1930s thousands of writers were hired by the Works Project Administration to create hundreds of guidebooks on all of the states in the U.S. These volumes that were produced became known as the American Guide Series. This series has been described as the biggest, fastest and most original research job in the history of the world. No library collection in Kentucky would be complete without a copy of Kentucky: A Guide To The Bluegrass State.