Standard Plans for Timber Bridge Superstructures PDF Download
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Author: James P. Wacker
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 58
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Book Description
These standardized bridge plans are for superstructures consisting of treated timber. Seven superstructure types are included: five longitudinal and two transverse deck systems. Both HS20 and HS25 loadings are included, along with L/360 and L/500 deflection criteria.
Author: James P. Wacker
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 58
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Book Description
These standardized bridge plans are for superstructures consisting of treated timber. Seven superstructure types are included: five longitudinal and two transverse deck systems. Both HS20 and HS25 loadings are included, along with L/360 and L/500 deflection criteria.
Author: Michael A. Ritter
Publisher:
ISBN: 9781410221919
Category : Technology & Engineering
Languages : en
Pages : 500
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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.
Author: Atorod Azizinamini
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 498
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Book Description
This collection contains 41 papers presented at the International Conference on High Performance Materials in Bridges, held in Kona, Hawaii, July 29-August 3, 2001.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 34
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Book Description
Author: Angela Marie Terry
Publisher:
ISBN:
Category : Flexure
Languages : en
Pages : 44
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Book Description
Author: Michael A. Ritter
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 980
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Book Description
Author: Michael G. Oliva
Publisher:
ISBN:
Category : Bridges, Wooden
Languages : en
Pages : 26
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Book Description
Author: Ronald W. Wolfe
Publisher:
ISBN:
Category : Roof trusses
Languages : en
Pages : 770
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Book Description
Author:
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 140
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Book Description
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 540
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Book Description
