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Author:
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 12
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Book Description
Author:
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 12
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Book Description
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: J K Paik
Publisher: Elsevier
ISBN: 1845695216
Category : Technology & Engineering
Languages : en
Pages : 552
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Book Description
Any structural system in service is subject to age-related deterioration, leading to potential concerns regarding maintenance, health & safety, environmental and economic implications. Condition assessment of aged structures is an invaluable, single source of information on structural assessment techniques for marine and land-based structures such as ships, offshore installations, industrial plant and buildings. Topics covered include: - - Current practices and standards for structural condition assessment - - Fundamental mechanisms and advanced mathematical methods for predicting structural deterioration - - Residual strength assessment of deteriorated structures - - Inspection and maintenance of aged structures - - Reliability and risk assessment of aged structuresProfessionals from a broad range of disciplines will be able to gain a better understanding of current practices and standards for structural condition assessment or health monitoring, and what future trends might be. - Single source of information on structural assessment techniques for marine and land-based structures - Examines the residual strength and reliability of aged structures - Assesses current practices covering inspection, health monitoring and maintenance
Author: Paula D. Hilbrich Lee
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 48
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Book Description
Author: James A. Kainz
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 20
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Book Description
The North Siwell Road bridge was constructed during December 1994 in Hinds County, Mississippi. The bridge is a single span, stress laminated T-beam structure measuring 9.1 m (30 ft) in length and 8.7 m (28.5 ft) in width. Performance of the bridge was monitored for 24 months, beginning at the time of installation. Monitoring involved gathering and evaluating data relative to the moisture content of the wood components, force level of stressing bars, and behavior of the bridge under static load conditions. Comprehensive visual inspections were also conducted to assess the overall condition of the structure. Based on field evaluations, the bridge is performing well.
Author: Michael A. Ritter
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 20
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Book Description
Author:
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 20
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Book Description
Author: James P. Wacker
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 16
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Book Description
Author: Lola E. Hislop
Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 24
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Book Description
Author: Parsons Brinckerhoff
Publisher: Transportation Research Board
ISBN: 0309099323
Category : Highway departments
Languages : en
Pages : 135
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Book Description
TRB¿s National Cooperative Highway Research Program (NCHRP) Report 608: GASB 34¿Methods for Condition Assessment and Preservation examines methodologies that integrate infrastructure inventory, condition assessments, minimum acceptable condition levels, and funding decisions with Governmental Accounting Standards Board (GASB) Statement No. 34 reporting requirements. The report also examines the operational and financial impacts of reporting under GASB 34. NCHRP Report 608 updates the findings contained in NCHRP Report 522: A Review of DOT Compliance with GASB 34 Requirements.
