Download or read book Development of Hardwood Glu laminated Timber Bridge Design Standards written by Harvey B. Manbeck and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Hardwood Glu laminated Timber Bridge Design Standards written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Six year Research Needs Assessment for Timber Transportation Structures written by Terry J. Wipf and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials for and Design of Hardwood Glulam Bridges written by Harvey Bright Manbeck and published by . This book was released on 1995 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Six year Research Needs Assessment for Timber Transportation Structures written by Terry J. Wipf and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Standards for Hardwood Glulam Timber Bridge Design written by Pennsylvania. Department of Transportation. Bureau of Design and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Timber Bridges written by Michael A. Ritter and published by Datamotion Publishing LLC. This book was released on 1990 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a comprehensive analysis of the design, construction, inspection, and maintenance of timber bridges.

Download or read book Standard Plans for Timber Bridge Superstructures written by James P. Wacker and published by . This book was released on 2001 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Timber Bridges written by Michael A. Ritter and published by . This book was released on 1990 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Standards for Hardwood Glulam Timber Bridge Design written by Pennsylvania. Department of Transportation. Bureau of Project Delivery and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Field Performance of Glued laminated Timber Bridges written by Jake Justin Bigelow and published by . This book was released on 2004 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to better utilize and develop timber structures in transportation, the United States government implemented several national programs starting in the early 1990's. Some of these programs were conducted by the United States Department of Agriculture Forest Service/Forest Products Laboratory and have attempted to develop a public awareness and effective use of timber and to advance timber technology for future use. One specific need identified was investigating the dynamic field performance of timber bridges due to vehicular loading. Currently, the American Association of State Highway and Transportation Officials (AASHTO) recommend a dynamic load allowance of 0.165 for timber bridges. Previously however, AASHTO did not include a load allowance for timber bridges. To quantify the appropriate code values, research was needed to determine the dynamic characteristics of timber bridges and to study their dynamic performance with respect to time and bridge condition. To fulfill this research need, five glued-laminated timber girder bridges and four longitudinal glued-laminated timber panel bridges were selected for testing. These bridges had also been tested previously in 1995 and 1996. The recent testing involved loading the structures dynamically with a fully loaded three axle dump truck to obtain dynamic response data. The information collected and discussed herein relates to the dynamic deflection, acceleration, and overall condition assessment for all nine bridges. The results of the individual bridges are also compared with each other to determine the validity of the current AASHTO recommendations and to develop better design standards. In general, the nine bridges tested were found to have fundamental frequencies between 5Hz and 11Hz as well as a dynamic load allowance less than 0.25. The bridges found to have dynamic amplifications above specified code values were also found to have physical characteristics (i.e., rough entrances) that caused the excessive dynamic amplification values.

Download or read book Crossings written by and published by . This book was released on 1990 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Conference on Wood Transportation Structures written by and published by . This book was released on 1996 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Criteria for Theater of Operations Glued Laminated Timber Highway Bridges written by L. I. Knab and published by . This book was released on 1977 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents structural design criteria recommendations for theater of operations (T/O) temporary glued-laminated timber highway bridges. The report consists of two volumes: Volume I provides the design criteria, procedures, and material specifications, and Volume II contains the development of and justification for the criteria in Volume I. State-of-the-art methodologies were used to develop the criteria, which are based on modifications to existing military and permanent criteria. Use of the criteria by engineers in bridge design offices should result in T/O bridges that have adequate safety and perform satisfactorily. Material weight of glued-laminated timber stringers in T/O bridges designed using the recommended criteria, typically will be about 15 percent less than when designed using permanent bridge criteria. (Author).

Download or read book Standard Plans for Southern Pine Bridges written by and published by . This book was released on 1995 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Efficient Utilization of Red Maple Lumber in Glued laminated Timber Beams written by John J. Janowiak and published by . This book was released on 1995 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of utilizing cant-sawn hardwood lumber, which would not usually be desired for furniture manufacture, was studied for the manufacture of structural glued-laminated (glulam) timber. Two red maple beam combinations were evaluated: (1) a glulam combination designed with E-rated lumber in 25 percent of the outer laminations (top and bottom) and No. 3 grade lumber in 50 percent of the center laminations and (2) a wide-width glulam combination with laminations made from nominal 2- by 4- and 2- by 6-in. No. 2 grade lumber laid edge-to-edge having staggered end joints (termed 2 by 4/2 by 6 glulam combination). Test results of 42 red maple glulam beams showed that it was feasible to develop structural glulam timber from cant-sawn lumber. The glulam combinations made from E-rated lumber exceeded the target design bending stress of 2,400 lb/in2 and met the target modulus of elasticity (MOE) of 1.8 Ã 106 lb/in2. In addition, the 2 by 4/2 by 6 glulam combination exceeded published design stresses for vertically laminated bending strength, MOE in both the horizontally and vertically laminated orientations, and horizontal shear stress in the vertically laminated orientation. Based on the results of the 2 by 4/2 by 6 glulam combination, it was determined that edge gluing the laminations to form wide-width lumber is not required to achieve targeted strength and stiffness levels. Data analysis showed that ASTM D3737 procedures developed for softwood species accurately predict beam stiffness and provide conservative bending and horizontal shear strength estimates for red maple glulam beams. Also, it was shown that results from ASTM D143 shear-block tests could be used to accurately predict horizontal shear strength of 2 by 4 and 2 by 6 red maple glulam beams.

Download or read book Live Load Deflection Criteria for Glued laminated Timber Bridges written by Travis Kent Hosteng and published by . This book was released on 2004 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to promote and increase the use of timber bridges in our nations transportation systems, the United States Department of Agriculture (USDA) and the Forest Products Laboratory funded research to develop design criteria to improve the design of glued-laminated timber bridges. This project is part of this research and is directed towards developing, and/or making recommendations for, acceptable live load deflection criteria, which are based on the actual structural performance of these types of bridges. Specifically, the relationship between live load deflection and the condition of the asphalt wearing surface is of particular interest. To accomplish this, eight glued-laminated timber girder bridges and four longitudinal glued-laminated timber deck bridges were selected for testing. The performance of the bridges was investigated under live loading and analyzed in conjunction with the condition of the wearing surfaces gathered from field inspections. Testing involved loading the structures with fully loaded tandem axle dump trucks and gathering global and differential deflection data. Field tests revealed that the majority of the asphalt wearing surface deterioration was primarily the result of differential deflections.