Author: Publisher:
ISBN:
Category : Bridges, Wooden
Languages : en
Pages : 20
Book Description
Bending Strength of Large Alaskan Sitka Spruce and Western Hemlock Log Bridge Stringers
Author: Publisher:
ISBN:
Category : Bridges, Wooden
Languages : en
Pages : 20
Book Description
Bending Strength of Large Alaskan Sitka Spruce and Western Hemlock Log Bridge Stringers
Author: Roger L. TuomiPublisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Native log stringer bridges are important economical and practical structures for logging roads in remote areas of Alaska. Unfortunately, the current knowledge of the strength of large logs is extremely limited. In the absence of actual test data, design stressess have been estimated by procedures developed for poles and piles. To obtain actual data on the strength of large logs, a field test facility was designed and 40 large logs were tested to destruction. These were probably the largest logs ever tested, with butt diameters up to 4 feet, 10 inches and ultimate bending loads in excess of 120,000 pounds. This study was limited to two species, Sitka spruce and western hemlock. The average breaking strengths were 4,530 pounds per square inch (lb sq in) for Sitka spruce and 4,680 lb /sq in for western hemlock. Both values are reasonably close to those obtained by the current design procedure. Statistical curves for estimating near-minimum strengths at various confidence levels were developed. It is normal practice in the design of wood structures to reduce the allowable stresses to a 10-year duration of maximum load. This is unrealistic for bridges where the maximum design load is present for only a short period. A cumulative load duration of 2 months is more realistic. A simple curve for stress adjustments at different load periods is presented. (Author).
Research Paper FPL
Author: Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 746
Book Description
Technical Abstract Bulletin
Author: Publisher:
ISBN:
Category : Science
Languages : en
Pages : 232
Book Description
Energy Efficiency in Light-frame Wood Construction
Author: Gerald E. SherwoodPublisher:
ISBN:
Category : Energy conservation
Languages : en
Pages : 724
Book Description
Crossings
Author: Publisher:
ISBN:
Category : Wooden bridges
Languages : en
Pages : 114
Book Description
U.S.D.A. Forest Service Research Paper FPL.
Author: Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 414
Book Description
California Black Oak Drying Problems and the Bacterial Factor
Author: J. C. WardPublisher:
ISBN:
Category : California black oak
Languages : en
Pages : 24
Book Description
Full-scale Testing of Wood Structures
Author: Roger L. TuomiPublisher:
ISBN:
Category : Bridges, Wooden
Languages : en
Pages : 20
Book Description
Full-Scale Load Testing of Structures
Author: W. R. SchrieverPublisher: ASTM International
ISBN: 9780803103689
Category : Science
Languages : en
Pages : 232
Book Description
