Full Scale Finite Element Modelling and Analysis of the 17Th
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Addendum to CORNISH-WINDSOR BRIDGE HAER No. NH-8 (Page 1)
Addendum to CORNISH-WINDSOR BRIDGE HAER No. NH-8 (Page 1) Introduction The Cornish-Windsor Bridge, the longest surviving covered bridge in the United States and the longest two-span covered bridge in the world, is a rare example of the notched squared timber Town lattice truss design.1 Built in 1866, it is listed on the National Register of Historic Places, and the American Society of Civil Engineers designated it as a National Historic Civil Engineering Landmark in 1970. One of the objectives of this study was to review and summarize the technical bibliography published about Cornish-Windsor Bridge. Since the bridge has an extraordinary span, its history includes a series of reinforcement, rehabilitation, and preservation issues that are worthy of study. The notched squared timber Town lattice truss is important as it represents a specific solution and modification to a known design to achieve a high load-bearing capacity and a high degree of stiffness, or rigidity, in a long structure. Notched squared timber Town lattice trusses, patented by Ithiel Town in 1839, represent a compromise-based solution by including fitted joints in the lattice. The most frequently cited advantage of the Town lattice trusses was that they did not need specialized carpentry work. Replacing overlapped planks and treenail joints with large-section lumber and notched joints meant that this criterion was not totally respected, though scarf (notched) joints–even if the members met at angles other than 90 degrees–were one of the simplest carpentry joints to make. The early development of wooden truss bridges and a general description of the major types, including the Town lattice truss, has been presented in detail in the history report for this bridge, and in materials listed in the bibliography, so they will not be repeated herein.2 The principal objectives of this study were: • to summarize technical information on notched squared timber Town lattice trusses generally and on Cornish-Windsor Bridge in particular. -
Utilization of Black Locust
UTILI"ATION OF BLAC"LOCUST B y "O H N B . ( Dru m Associ a te W ood Tech n o l o i st For est P r od u cts L a bor a tor Br a n ch o Res g , y, f ea r ch , For est S er vi ce CO NT ENT S o ) o t 9 c O Int r oduct io n H Utiliz ati on Th e t r ee M Insul at or pins Range M W agon hubs H a b it s an d gr owt h M T r eenails Repr oduction W Fence post s Annual cu t an d pr esent supply Q M ine t i mber s ‘ Cut ting an d mar keting O Poles Th e wood Q M inor uses Appear ance Q Summar y St r uct ur e G A ppendix Pr o per ties N Specifi cat i ons for insul at or pins Specifi cations for t r eenails I N T R O D UC T I O N Ro bi 'n i a seu d oacaci a " The wood of black locust , p , is used chie y for insulator pins , wagon hubs , treenails , fence posts , and mine F r . o timbers these uses it is admirable because of its hardness , A i s strength , and durability . valuable characteristic of the tree its rapid growth on many types of soils during the first 20 to 30 years of its life . This rapid growth and the extensive network of roots developed by black locust make it well suited fo r planting t o check erosion . -
Inspection of Wooden Vessels
Guidance on Inspection, Repair, and Maintenance of Wooden Hulls ENCLOSURE (1) TO NVIC 7-95 COMPILED BY THE JOINT INDUSTRY/COAST GUARD WOODEN BOAT INSPECTION WORKING GROUP August 1995 TABLE OF CONTENTS ACKNOWLEDGEMENTS A-1 LIST OF FIGURES F-1 GLOSSARY G-1 CHAPTER 1. DESIGN CONSIDERATIONS A. Introduction 1-1 B. Acceptable Classification Society Rules 1-1 C. Good Marine Practice 1-1 CHAPTER 2. PLAN SUBMITTAL GUIDE A. Introduction 2-1 B. Plan Review 2-1 C. Other Classification Society Rules and Standards 2-1 D. The Five Year Rule 2-1 CHAPTER 3. MATERIALS A. Shipbuilding Wood 3-1 B. Bending Woods 3-1 C. Plywood. 3-2 D. Wood Defects 3-3 E. Mechanical Fastenings; Materials 3-3 F. Screw Fastenings 3-4 G. Nail Fastenings 3-5 H. Boat Spikes and Drift Bolts 3-6 I. Bolting Groups 3-7 J. Adhesives 3-7 K. Wood Preservatives 3-8 CHAPTER 4. GUIDE TO INSPECTION A. General 4-1 B. What to Look For 4-1 C. Structural Problems 4-1 D. Condition of Vessel for Inspection 4-1 E. Visual Inspection 4-2 F. Inspection for Decay and Wood Borers 4-2 G. Corrosion & Cathodic Protection 4-6 H. Bonding Systems 4-10 I. Painting Galvanic Cells 4-11 J. Crevice Corrosion 4-12 K. Inspection of Fastenings 4-12 L. Inspection of Caulking 4-13 M. Inspection of Fittings 4-14 N. Hull Damage 4-15 O. Deficiencies 4-15 CHAPTER 5. REPAIRS A. General 5-1 B. Planking Repair and Notes on Joints in Fore and 5-1 Aft Planking C. -
Two Bridges Built Using Black Locust Wood
Two Bridges Built Using Black Locust Wood Ryan Woodward Bridge Engineer HNTB Corporation New York, NY USA [email protected] Ted Zoli Chief Bridge Engineer HNTB Corporation New York, NY USA [email protected] Summary Two pedestrian bridges were recently built in New York using Black Locust wood, an unusual choice for a structural material despite its high strength, rot resistance, and local availability. The bridges explore the structural abilities of Black Locust, representing two very different bridge types. Squibb Bridge (an underslung suspension bridge) is built from short logs used in the round, with tubular steel connections. The TA Footbridge at Vassar College (a Town lattice truss) borrows from historic covered bridge technology, incorporating wooden peg connections. As Black Locust is naturally rot resistant, a cover is not necessary. Limited information is available regarding the mechanical properties of Black Locust, and the species is unaddressed by the design codes and grading agencies. Load testing was performed using full-scale members and small clears in order to substantiate average values reported in the literature. Data is presented compatible with ASTM standards and NDS practices. Guidance is provided for visual inspection, with attention to unsound knots, slope of grain, and Locust Borers. An inexpensive method for acoustic testing was developed for measuring modulus of elasticity and detecting voids, and could be further developed for timber grading at any mill. Keywords: Black Locust, Town lattice truss, underslung suspension bridge. 1. Introduction Although it is not considered a commercially important wood species in the United States, Black Locust (Robinia pseudoacacia) has some potential as a more sustainable alternative to tropical hardwoods. -
Wood Handbook--Glossary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Anisotropic. Exhibiting different properties when measured along Glossary different axes. In general, fibrous materials such as wood are anisot- Adherend. A body that is held to another body by an adhesive. ropic. Adhesion. The state in which two surfaces are held together by Assembly Joint. (See Joint.) interfacial forces which may consist of valence forces or interlock- Assembly Time. (See Time, Assembly.) ing action or both. Balanced Construction. A construction such that the forces in- Adhesive. A substance capable of holding materials together by duced by uniformly distributed changes in moisture content will not surface attachment. It is a general term and includes cements, cause warping. Symmetrical construction of plywood in which the mucilage, and paste, as well as glue. grain direction of each ply is perpendicular to that of adjacent plies Assembly Adhesive—An adhesive that can be used for bonding is balanced construction. parts together, such as in the manufacture of a boat, airplane, Bark Pocket. An opening between annual growth rings that con- furniture, and the like. tains bark. Bark pockets appear as dark streaks on radial surfaces Cold-Setting Adhesive—An adhesive that sets at temperatures and as rounded areas on tangential surfaces. below 20°C (68°F). Bastard Sawn. Lumber (primarily hardwoods) in which the annual Construction Adhesive—Any adhesive used to assemble pri- rings make angles of 30° to 60° with the surface of the piece. mary building materials into components during building con- Beam. -
Mastering Skills
MASTERING SKILLS with the Join Now $49.95 year Each month WoodenBoat School Director Rich Hilsinger hosts a new video episode you can stream from the comfort of your home. The series will cover a variety of topics pertaining to traditional small boats, their construction and crafts. You’ll learn from seasoned boatbuilders Greg Rössel, Milo Stanley, and Eric Dow. Throughout the year Rich and company will bring you helpful tips, techniques, and various approaches to building a small wooden boat with your own hands, as well as other woodworking projects. Run times are approximately 30 to 60 minutes. Join for the year and here’s what you’ll be able to Episode 8: Spar Construction with Milo Stanley. watch, over and over again, with a new episode released each month. Episode 9: three part series on Building Half Models with Eric Dow. Episode 1: four part series on Reading Boat Plans, plus a meet and greet with Greg Rössel. Plus three more episodes to round out the year Episode 2: three-part series on Station Molds. Episode 3: three part series on Laying Out and Cut- ting a Stem Rabbet. Episode 4: three part series on Steambox Designs, and How They Work, and Great start to the skills class. Bending Frames. Looking forward to many topics Episode 5: three part series, Making Boatbuilding Tools, includes measuring tools and clamps. for review and some new tips and techniques to add to the tool Episode 6: two part series on Spiling Planks and Drilling Long Bolt Holes. chest. Thanks for making this Episode 7: three-part series on Fitting Thwarts. -
Chapter Five Hull Planking This Model of the Syren Will Be Planked with a Single Layer STEP ONE — As Done Earlier, Use a Batten to Establish of 1/16” Thick Planking
A batten is pinned along the hull to establish the top of the wales. It ensures a smooth run for the planking from bow to stern. Chapter Five Hull Planking This model of the Syren will be planked with a single layer STEP ONE — As done earlier, use a batten to establish of 1/16” thick planking. The Syren is not a project for the the proper, smooth run of your planking from bow to stern. first time model builder and therefore it can be assumed Each bulkhead has a reference line on it that represents that most of you have some planking experience. However the top edge of the wales. Run your batten across the hull experienced you may be there is a book available at www. and pin it temporarily into position. The top edge of the modelexpo-online.com that discusses planking techniques batten should lie against the reference marks. View the in great detail. “PLANKING THE BUILT-UP SHIP MODEL” batten from many angles to ensure it has no unsightly dips. by Jim Roberts. It is a step-by-step procedural guide to the When you are satisfied do the same on the other side of historically and technically correct methods of planking ship the hull. Placing the battens on both sides now will give models. It is highly recommended. There have been many you the opportunity to inspect them from the bow and the other books and articles written about how to properly stern. The battens should have a symmetrical appearance plank a ship model. -
TFG Glossary of Terms 2015
Copyright © 2015 Timber Framers Guild TFG Glossary of Terms 2015 KEY TO CROSS-REFERENCE TERMS See also See a related, similar thing Cf. Compare a related, dissimilar thing Also Another name for the same thing (q.v.) Which see ABUTMENT. In joinery, the end of one timber touch- BASKET HITCH. Open sling configuration for lifting ing another. See also BUTT JOINT. timber. Cf. CHOKER HITCH. ADZE. Handled edge tool (various patterns) with its BAY. Crosswise volume (perpendicular to roof ridge) in a edge at a right angle to the handle, used to shape or dress building, bounded by two bents or crossframes. Cf. AISLE. timbers. BEAM. Any substantial horizontal framing member. AISLE. Lengthwise volume (parallel to the roof ridge) in BEARING. Area of contact in a joint through which a building divided into several such spaces, usually three. load is transferred. Cf. BAY. BED TIMBER. Short, stout timber used to distribute ANCHOR BEAM. In a Dutch barn, the major tie beam concentrated loads at bridge piers and abutments. joined to H-bent posts, generally by outside-wedged BEETLE. Large wooden mallet typically weighing 15 to through tenons. 30 lbs. Also COMMANDER, PERSUADER. ANGLE TIE. Horizontal corner brace at plate level, often BENDING. Deviation from straight resulting from the combined with a dragon beam (q.v.) under hip roofs. application of force. In a bent member, the concave sur- ANISOTROPIC. Material whose structural properties face is compressed, the convex surface is tensioned and the are not identical in every direction. neutral axis is unaffected. ARCH BRACE 1. Curved brace. 2. Brace rising from BENT. -
Biodeterioration of Wood Chapter 13
Chapter 13 Biodeterioration of Wood Terry L. Highley nder proper conditions, wood will give centuries of Contents service. However, if conditions exist that permit the Fungus Damage and Control 13–1 development of wood-degrading organisms, protec- tion must be provided during processing, merchandising, Molds and Fungus Stains 13–2 and use. Chemical Stains 13–3 The principal organisms that can degrade wood are fungi, Decay 13–3 insects, bacteria, and marine borers. Prevention of Mold, Stain, and Decay 13–6 Molds, most sapwood stains, and decay are caused by fungi, Remedial Treatment of Internally Decayed Wood 13–8 which are microscopic, thread-like microorganisms that must have organic material to live. For some of them, wood offers Bacteria 13–8 the required food supply. The growth of fungi depends on Insect Damage and Control 13–8 suitably mild temperatures, moisture, and air (oxygen). Chemical stains, although they are not caused by organisms, Beetles 13–8 are mentioned in this chapter because they resemble stains Termites 13–11 caused by fungi. Carpenter Ants 13–13 Insects also may damage wood, and in many situations must be considered in protective measures. Termites are the major Carpenter Bees 13–13 insect enemy of wood, but on a national scale, they are a less Marine Borer Damage and Control 13–13 serious threat than fungi. Shipworms 13–13 Bacteria in wood ordinarily are of little consequence, but some may make the wood excessively absorptive. In addi- Pholads 13–14 tion, some may cause strength losses over long periods of Limnoria and Sphaeroma 13–14 exposure, particularly in forest soils. -
Properties and Uses of Some . of Me More Important Woods Grown in Urazi L
PROPERTIES AND USES OF SOME . OF ME MORE IMPORTANT WOODS GROWN IN URAZI L IBy Eugene F. Horn .■ No. R83 Prepared from the Authors Persona l lKnouuIedge and Contributed, to th e United States Forest Service I_N D E X Brazilian goods Alphabetically by Common Name Page Acapu (Andira aubletti Benth, or Vonacapoua americana) 5 Andiroba or Crabwood (Carapa guianensis Aubl . Carapa latifolia Nilid .) 6 Angico (Piptadenia rigida Benth . or Acacia angico Mart .) 6 Arariba amarella (Centrolobium robustum Mart .) 6 Arariba vermelha (Centrolobium tomentosum Benth .) 7 Aroeira vermelha (Schinus terebinthifolia Raddi .) 7 Aroeira preta (Astronium urundeuva, Engl .) 8 Cabreuva vermelha (Myrocarpus fastigatus, Fr . All .) 9 Cabreuva amarella (Myroxylon tuluiferum, H .B .K.) 10 Imbuia (Nectandra sp .) 1 0 Canella parda (Nectandra amara, Mart) 11. Canella Sassafras (Mespilodaphne sassafras, Meissn . , or Ocotea pretiosa, Neis .) r 1 2 Canella preta (Nectandra moths Meissn .) . 12 Cedro or Spanish Cedar (Cedrela sp .) 13 Cedro amarella (Cedrela brasiliensis Juss .) 13 ' Cedro branco (Cedrela fissilis Veil .) z 13 . Cuamara or Tonka-bean cumary (Dipteryx odorata Willd . , or Coumarouna odorato Aubl .) 14'- Faveiro amarella (Pterodon pubescens Benth .) 14 Genipapo (Genipa americana L . or Gardenia brasiliensis or Genipa brasiliensis) 15" • Goncalo alves (A.stronium froxinifoliumSchott .) 15 Guarabu or Pao roxo (Peltogyne confertiflora Benth .) 1 6 Guarabu preta (Peltogyne guarabu Solid or . Peltogyne macrolobium Fr . All .) 1 6 Guaranta (Esenbeckia ieiocarpa Engel .) 16 . Guatambu amarella (Aspidosperma macrocarpum Mart .) 17 Imbuia (see p . 10 ) Ipe tabaco (Tacoma pendicellata Bur . Sch :) 18 Ipe preta (Tacoma impetiginosa Mart .) 19 Jacaranda oabiuna (Dalbergia nigra Fr . 1X11 .) : 20 Jacaranda rosa (Machaerium incorruptible Fr . All .) 20 Jacaranda violeta (Machaerium violaceum Veg .) 2 0 Jacaranda preto (Machaerium legale Benth :) 2 1 Jacaranda roxo (Machaerium legale Benth .) . -
Guidelines to Restoring Structural Integrity of Covered Bridges
United States Department of Agriculture Guidelines to Restoring Structural Integrity of Covered Bridge Members Ronald W. Anthony Forest Service In cooperation with the Forest Products Laboratory United States Department of Transportation General Technical Report Federal Highway Administration FPL–GTR–252 January 2018 A FHWA-NHCBP (National Historic Covered Bridge Preservation) publication Abstract These guidelines are designed for decision makers This study is part of the Research, Technology, and (selectmen, county commissioners, city planners, Education portion of the National Historic Covered preservation officers, etc.) that have responsibility for Bridge Preservation (NHCBP) Program administered by repairing and maintaining existing covered bridges to help the Federal Highway Administration. The NHCBP them understand what goes into making effective decisions program includes preservation, rehabilitation, and about how, and when, to repair a covered bridge. The restoration of covered bridges that are listed or are purpose of these guidelines is to present the steps necessary eligible for listing on the National Register of Historic for decision makers to identify effective rehabilitation Places; research for better means of restoring and techniques for restoring the structural integrity of covered protecting these bridges; development of educational bridge members. The intent is to retain the maximum aids; and technology transfer to disseminate information amount of historic fabric while ensuring public safety and on covered bridges -
Download Background Resources 01 V.01
Euromodel – BACKGROUND RESOURCES.Part 1.v.01 BACKGROUND RESOURCES for MODEL SHIP BUILDING Part 1.v.01 The majority of photos used are taken (with permission) from Model Ship World postings. piratepete007 2016 Useful Reference Texts Anderson, R.C. (1955): Seventeenth Century Rigging [almost a complete copy of his earlier book The Rigging of Ships in the Days of the Spritsail Topmast, 1600 – 1720 (1927) ] Goodwin, Peter (1984): The Construction and Fitting of the English Man of War 1650-1850 Lee, James (1984): The Masting and Rigging of English Ships of War 1625 – 1860 Mondfeld, Wolfram zu (1989): Historic Ship Models 1 Euromodel – BACKGROUND RESOURCES.Part 1.v.01 The following pages are a collection of comments that explain some methods used in model construction as well as in operating a ship. I have not presumed to be an authority in this area and so many comments will be lacking in both detail, time and country but this presentation grew out of a wish to educate myself in such matters. Hopefully, by sharing with others, some of this knowledge will prove useful. Some of the comments and many of the photos have been extracted from posts made by various members of the Model Ship World Forum and I am indebted to their giving permission to do so (if I have overlooked somebody and not acknowledged their name, I sincerely apologise and please let me know). In alphabetical order, they include … Amateur banyan Brian C Dan Vadas (especially from his posting for HMS Vulture) DaveRow Denis R Doc Blake GuntherMT guraus hornet Janos JerseyCity Frankie J.P.