Download or read book Cold Temperature Effects on Stress laminated Timber Bridges written by James P. Wacker and published by . This book was released on 2003 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cold Temperature Effects on Stress Laminated Bridge Decks written by Robert T. Seavey and published by . This book was released on 1997 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Thermal Change in Stress laminated Timber Bridge Decks written by James A. Kainz and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Thermal Change in Stress laminated Timber Bridge Decks written by James A. Kainz and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the timber bridge design has evolved, some engineers have been concerned about the integrity of the stress-laminated system in cold climates. The structural integrity of a stress-laminated bridge depends on the level of interlaminar compression (between the wood laminations). Temperature change can cause material shrinkage, which could lead to substantial performance problems based on material mechanics and the nature of the stress-laminated system. In this study, to determine the effects of thermal change on interlaminar compression, four stress-laminated timber deck sections were put through a warm--cold--warm cycle. Various interlaminar stress levels and three moisture content levels were tested. Results showed that interlaminar compression in stress-laminated decks of this size was not affected by extremely cold temperatures when the moisture content was less than 19% and when initial bar force was sufficient.
Download or read book Cold Temperature Effects on Stress laminated Timber Bridges written by James P. Wacker and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Paper FPL RP written by and published by . This book was released on 1986 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Wood Preservatives on Stress laminated Southern Pine Bridge Test Decks written by James A. Kainz and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: For wood to work successfully in external environments, it must be treated with chemical preservatives. This study determined the effect of various oil- and water-based preservatives on the performance of stress-laminated Southern Pine bridge decks. This 2Â-year study was limited to one species for the wood laminations and one type of stress laminated system. Nine half-width, full-length stress laminated test decks were constructed of Southern Pine lumber. Each test deck was treated with one of seven preservatives and outfitted with one of three bar anchorage types. Moisture content levels did not change significantly throughout the monitoring period, which implies that the wood had achieved moisture equilibrium prior to testing. According to this study, when Southern Pine stress laminated bridge decks are properly designed, (1) the anchorage system has a negligible effect on bar force retention and (2) water-based preservatives may be successfully used to treat these bridge decks. We recommend that the design guidelines currently available for stress-laminated decks treated with oil-based preservatives be extended to decks treated with water-based preservatives and constructed with any bar anchorage system. This recommendation is based on the similarity of the behavior of water- and oil-based preservatives in the stress-laminated test decks treated in this study.
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 Effect of Bridge Deck Insulation on Icing Conditions written by and published by . This book was released on 1964 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report evaluates the effectiveness of urethane foam sprayed on the underside of bridge decks as insulation to reduce icing. A tri-level interchange in Rochester, New York was selected for the experimental installation. Surface temperatures of the upper and lower decks and the approach pavements were measured continuously during part of the winter of 1961-62 prior to the application of the urethane foam. Similar data was obtained for the entire winder of 1962-63 after the undersides of the decks had been insulated. Supplementary information included precipitation records, visual observations of icing, traffic studies, and an examination of a previously insulated bridge. The uninsulated decks were found to be only slightly more susceptible to icing than the approaches. Moreover, insulating the decks did not appreciably reduce icing. In fact, the temperature-stabilizing effect of the urethane increased the potential for icing during most of the winter. In addition, evidence that the insulation had trapped water suggested that the concrete deck and structural steel could be adversely affected. The only benefit derived from the insulation was a significant reduction of freeze-that cycles. This advantage is considered to be secondary, compared to the effect on the potential for icing. As a result of this investigation, it is recommended that further use of insulation to reduce icing be discontinued. The removal of the insulation from the experimental bridges also is suggested.
Download or read book Crossings written by and published by . This book was released on 1995 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dividends from Wood Research written by and published by . This book was released on 1995-07 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Accomplishments for Wood Transportation Structures Based on a National Research Needs Assessment written by Michael A. Ritter and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bridge Maintenance Safety Management Life Cycle Sustainability and Innovations written by Hiroshi Yokota and published by CRC Press. This book was released on 2021-04-20 with total page 8732 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations contains lectures and papers presented at the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), held in Sapporo, Hokkaido, Japan, April 11–15, 2021. This volume consists of a book of extended abstracts and a USB card containing the full papers of 571 contributions presented at IABMAS 2020, including the T.Y. Lin Lecture, 9 Keynote Lectures, and 561 technical papers from 40 countries. The contributions presented at IABMAS 2020 deal with the state of the art as well as emerging concepts and innovative applications related to the main aspects of maintenance, safety, management, life-cycle sustainability and technological innovations of bridges. Major topics include: advanced bridge design, construction and maintenance approaches, safety, reliability and risk evaluation, life-cycle management, life-cycle sustainability, standardization, analytical models, bridge management systems, service life prediction, maintenance and management strategies, structural health monitoring, non-destructive testing and field testing, safety, resilience, robustness and redundancy, durability enhancement, repair and rehabilitation, fatigue and corrosion, extreme loads, and application of information and computer technology and artificial intelligence for bridges, among others. This volume provides both an up-to-date overview of the field of bridge engineering and significant contributions to the process of making more rational decisions on maintenance, safety, management, life-cycle sustainability and technological innovations of bridges for the purpose of enhancing the welfare of society. The Editors hope that these Proceedings will serve as a valuable reference to all concerned with bridge structure and infrastructure systems, including engineers, researchers, academics and students from all areas of bridge engineering.
Download or read book Transportation Research Annual Report written by Minnesota. Dept. of Transportation and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Temperature on Fiber Composite Bridge Decks written by Mahesh Gajula Nagabhushanam and published by . This book was released on 2009 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study the fiber composite bridge decks were subjected to thermal gradients to obtain the temperature difference between the top and bottom surface of the decks and to determine the thermal properties of the deck. The fiber composite bridge decks were fabricated in sizes of 2 feet wide x 8 feet long x .5 feet deep and 4 feet wide x 8 feet long x .5 feet deep specimens by Kansas Structural Composites Inc. The project consisted of 3 specimens of size 2 feet in width x 8 feet in length x .5 feet in depth with ribs oriented along longitudinal direction, 3 specimens of size 2 feet in width x 8 feet in length x .5 feet in depth with ribs oriented along transverse direction and a specimen of size 4 feet in width x 8 feet in length x .5 feet in depth with ribs oriented along transverse direction. Two specimens with ribs oriented along longitudinal direction and two specimens with ribs oriented along transverse direction of size 2 feet in width x 8 feet in length x .5 feet in depth were subjected to temperature greater than 120 degrees F with unrestrained ends. Four tests were carried out on two specimens having ribs oriented along longitudinal direction and two specimens having ribs oriented along transverse direction with the shorter ends restrained. The top surface was exposed to constant temperature until the temperature and the strain linearize at the bottom surface of the fiber composite deck to obtain the difference in temperature between the top and bottom surface of the deck. The decks were restrained using a mechanical setup made up of fiber composite sections. A single specimen of size 4 feet in width x 8 feet in length x .5 feet in depth was tested for thermal loads greater than 120 degrees F with unrestrained ends. The strain readings were recorded using strain gage technology from Vishay Micro Measurements and the displacement was measured for specimens with restrained ends using cable extension displacement sensor at half span. A prototype of fiber composite deck was modeled using PRO-E and analyzed using ANSYS FEM software.
Download or read book Innovative Methods and Materials in Structural Health Monitoring of Civil Infrastructures written by Raffaele Zinno and published by MDPI. This book was released on 2021-09-02 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, when elements in structures were composed of perishable materials, such as wood, the maintenance of houses, bridges, etc., was considered of vital importance for their safe use and to preserve their efficiency. With the advent of materials such as reinforced concrete and steel, given their relatively long useful life, periodic and constant maintenance has often been considered a secondary concern. When it was realized that even for structures fabricated with these materials that the useful life has an end and that it was being approached, planning maintenance became an important and non-negligible aspect. Thus, the concept of structural health monitoring (SHM) was introduced, designed, and implemented as a multidisciplinary method. Computational mechanics, static and dynamic analysis of structures, electronics, sensors, and, recently, the Internet of Things (IoT) and artificial intelligence (AI) are required, but it is also important to consider new materials, especially those with intrinsic self-diagnosis characteristics, and to use measurement and survey methods typical of modern geomatics, such as satellite surveys and highly sophisticated laser tools.
Download or read book Fifth International Bridge Engineering Conference written by and published by . This book was released on 2000 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the Fifth International Bridge Engineering Conference, April 3-5, 2000, Tampa, Florida.
