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Author: David E. Kretschmann
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 24
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Book Description
To satisfy the increased demand for forest products, much of the future timber supply is expected to be derived from improved trees grown on managed plantations. This fast-grown resource will tend to be harvested in short-age rotations and will contain higher proportions of juvenile wood compared with wood in current harvests. As a result, current allowable properties may need to be reduced in the future. This report explores four options for monitoring the properties of fastgrown wood and briefly discusses the advantages and disadvantages of these approaches. The recommended multiple-stage sampling approach is illustrated in detail using simulated results based on the North American In-Grade test results for Southern Pine. Finally, the report presents details of a gbsreal worldgcs example of monitoring lumber properties currently being conducted by the Southern Pine Inspection Bureau.
Author: David E. Kretschmann
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 24
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Book Description
To satisfy the increased demand for forest products, much of the future timber supply is expected to be derived from improved trees grown on managed plantations. This fast-grown resource will tend to be harvested in short-age rotations and will contain higher proportions of juvenile wood compared with wood in current harvests. As a result, current allowable properties may need to be reduced in the future. This report explores four options for monitoring the properties of fastgrown wood and briefly discusses the advantages and disadvantages of these approaches. The recommended multiple-stage sampling approach is illustrated in detail using simulated results based on the North American In-Grade test results for Southern Pine. Finally, the report presents details of a gbsreal worldgcs example of monitoring lumber properties currently being conducted by the Southern Pine Inspection Bureau.
Author: David E. Kretschmann
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 26
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Book Description
To satisfy the increased demand for forest products, much of the future timber supply is expected to be derived from improved trees grown on managed plantations. This fast-grown resource will tend to be harvested in short-age rotations and will contain higher proportions of juvenile wood compared with wood in current harvests. As a result, current allowable properties may need to be reduced in the future. This report explores four options for monitoring the properties of fastgrown wood and briefly discusses the advantages and disadvantages of these approaches. The recommended multiple-stage sampling approach is illustrated in detail using simulated results based on the North American In-Grade test results for Southern Pine. Finally, the report presents details of a gbsreal worldgcs example of monitoring lumber properties currently being conducted by the Southern Pine Inspection Bureau.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 34
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Book Description
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 672
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Book Description
Author: Donald E. Breyer
Publisher: McGraw Hill Professional
ISBN: 1260128687
Category : Technology & Engineering
Languages : en
Pages : 896
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Book Description
The leading wood design reference—thoroughly revised with the latest codes and dataFully updated to cover the latest techniques and standards, the eighth edition of this comprehensive resource leads you through the complete design of a wood structure following the same sequence used in the actual design/construction process. Detailed equations, clear illustrations, and practical design examples are featured throughout the text. This up-to-date edition conforms to both the 2018 International Building Code (IBC) and the 2018 National Design Specification for Wood Construction (NDS).Design of Wood Structures-ASD/LRFD, Eighth Edition, covers:•Wood buildings and design criteria•Design loads•Behavior of structures under loads and forces•Properties of wood and lumber grades•Structural glued laminated timber•Beam design and wood structural panels•Axial forces and combined loading•Diaphragms and shearwalls•Wood and nailed connections•Bolts, lag bolts, and other connectors•Connection details and hardware•Diaphragm-to-shearwall anchorage•Requirements for seismically irregular structures•Residential buildings with wood light frames
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 144
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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: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1128
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author: Sven Thelandersson
Publisher: John Wiley & Sons
ISBN: 9780470844694
Category : Technology & Engineering
Languages : en
Pages : 460
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Book Description
Timber construction is one of the most prevalent methods of constructing buildings in North America and an increasingly significant method of construction in Europe and the rest of the world. Timber Engineering deals not only with the structural aspects of timber construction, structural components, joints and systems based on solid timber and engineered wood products, but also material behaviour and properties on a wood element level. Produced by internationally renowned experts in the field, this book represents the state of the art in research on the understanding of the material behaviour of solid wood and engineered wood products. There is no comparable compendium currently available on the topic - the subjects represented include the most recent phenomena of timber engineering and the newest development of practice-related research. Grouped into three different sections, 'Basic properties of wood-based structural elements', 'Design aspects on timber structures' and 'Joints and structural assemblies', this book focuses on key issues in the understanding of: timber as a modern engineered construction material with controlled and documented properties the background for design of structural systems based on timber and engineered wood products the background for structural design of joints in structural timber systems Furthermore, this invaluable book contains advanced teaching material for all technical schools and universities involved in timber engineering. It also provides an essential resource for timber engineering students and researchers, as well as practicing structural and civil engineers.
Author: Ronald W. Wolfe
Publisher:
ISBN:
Category : Roof trusses
Languages : en
Pages : 770
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Book Description
