bridge deck timbers density

bridge deck timbers density

WEARING SURFACES FOR TIMBER DECKS

WEARING SURFACES FOR TIMBER DECKS 11.1 INTRODUCTION A wearing surface is a layer placed on the bridge deck to form the road­ way surface. It is the only portion of the bridge in direct contact with vehicle traffic. On timber bridges a wearing surface is one of the most important components of the superstructure and serves two primary purposes.

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Wood density and hardness | QTimber

Wood density influences timber classification and scheduling for appropriate use. This table gives information about the relationship between timber hardness and density. * The data used are for air-dry density that is the wood at 12% moisture content which is the average equilibrium moisture content for internal environments in Queensland.

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Structural Plywood Bridge Decking Bridge ply building supplies

Bridge ply – Give timber bridges a new lease of life Bridge ply is a structural grade plywood manufactured to AS/NZS 2269 from sustainable Australian plantation pine. It provides a reliable replacement where suitable lengths of solid hardwood timber are unavailable for bridge decking.

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Timber Bridge - an overview | ScienceDirect Topics

K.A. Malo in Innovative Bridge Design Handbook 2016. 5.1.1 Glulam. Most timber bridges built today use glulam which is a stack of parallel solid wood lamellas with a thin layer of glue in between brought together into a single statical element by applied external pressure during the curing of the glue.

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Timber in Bridge Structures - Theseus

abilities of timber in bridge structures the case study was conducted. The steel beams holding the bridge deck were replaced with the timber beams. 2 Background In order to implement more timber in special structures such as bridges it is important to study the material: Its properties characteristics and special needs. In the back-

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AN IMPROVED FASTENING DESIGN FOR FASTENER-LAMINATED TIMBER ...

different bridge substructures supporting more than 700 bridges with timber decks in the province. The timber bridge decks currently used in New Brunswick are mainly made of nail-laminated timber (NLT) which refers to the timber deck with laminations nailed together perpendicular or parallel to the direction of the traffic flow.

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Timber Bridge Manual - Section 5

Figure 5.3.3.3-2 Molong Bridge Timbers Electrical Moisture Meter 15 Figure 5.3.3.5-1 Abbotsford Bridge Hydraulic Tensioning of Tie Downs 17 Figure 5.4.3.2-1 Waterproofing Membrane and Deck Edge Flashing 20

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Timber-concrete composite bridges: Three case studies ...

Timber-concrete composite (TCC) beams consist of two parts an upper concrete slab tied to a lower timber beam by means of shear connectors as shown in Fig. 1.In the following a bridge will be defined short if it has a span allowing being designed using standard procedures available in standards and code of practice.

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Stream Smart: Concrete Block Abutment Timber Deck Bridge ...

An overview of the construction process for a concrete block abutment timber deck bridge. Part of a series of five construction videos which demonstrate diff...

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Chapter 23 Timber Structures

WisDOT Bridge Manual Chapter 23 – Timber Structures July 2019 23-3 Introduction 23.1.1 General This chapter covers the design of spike “laminated deck” superstructures made of timber . This type of structure has a laminated wood deck where of laminations placed a seriesare edgewise and oriented in the direction of the span of the bridge.

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Associate and Sr. Prin. Engr.

Popularity of Timber Decks • 10% of all bridge decks in USA are timber ¾Iowa has 11% of the total ¾8 other states have at least 4% each of the total • of those with timber decks ¾7% are all wood bridges ¾10% are on thru trusses ¾78% are on steel beams • Delaware County NY (larger than RI)

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STOCHASTIC ASSESSMENT OF NIGERIAN TIMBERS FOR BRIDGE DECKS IN ...

An exception to this are timber which belong to the strength class N 1 where the stringers can be spaced at 450mm using timber with dimension not lower then 100mm thick and width not less than 250mm.The recommended strength classes with associated material properties can be a source of sustainable bridge deck material over a reasonable period ...

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TIMBER BRIDGE DECKS - Treated Timber Products

Laminated timber bridge with timber substructures. This one has spans of 20 feet with a 24 foot roadway and the deck thickness is 12 inches. Deck.” As the width of our roads and bridges increased a system of staggered butt-joints were used with each butt-joint over a stringer. This deck was considered a “Continuous

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Standard Plans for Timber Highway Structures

nomical timber bridge designs. In these plans com-plete design fabrication and construction information are provided for several timber bridge superstructures and railing systems. Each system is adaptable to vari-ous span length and width combinations although specific site conditions may require modifications.

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Wood Bridge Materials | American Pole & Timber | 866.397.3038 ...

Our bridge project experience ranges from Department of Transportation (DOT) timber bridges to golf course bridges to pedestrian bridges. Our experience excellent stock and custom wood manufacturing capabilities mean you will get the materials and assistance you need to make your wood bridge strong long-lasting and beautiful.

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IN-DEPTH TIMBER BRIDGE INSPECTION AND LOAD RATING

Fig. 3 Start-up screen for Timber Bridge Analysis and Rating program The following bridge and deck types can be load rated in TBAR using load resistance factor design (LRFD) or allowable stress design (ASD): Beam Type Bridges: • Solid sawn • Glued-laminated • Native Log • Steel girders with timber decks

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Asphalt Paving of Treated Timber Bridge Decks

Glued-Laminated Timber Panel Decks—Glued-laminated panels usually are placed across (transverse to) beams or stringers to create the bridge deck and connected to timber beams mechanically with lag bolts or deformed shank nails. The panels usually are bolted onto steel beams. Glued-laminated timber panel decks also can be placed longi-

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NCDOT: Timber Stringer Bridges

The no longer standing Kirby’s Creek Bridge (Northampton County Bridge 77) north of Conway built in 1935 with timber stringers and substructure and state-standard reinforced concrete railings (source: NCDOT bridge inspection files). Timber stringer bridges are simply a series of parallel wooden beams or logs carrying a deck.

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Composite Advantage FiberSPAN Vehicle Bridge Decks

Types of Bridge Deck Systems. Timber Deck Systems Timber is among the oldest materials used to fabricate bridge decks. A timber deck consists of a series of rough cut beams placed on wooden iron or steel frames. Today timber decks are mostly used in pedestrian bridges and a handful of car and rail bridges in low traffic areas.

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Timber Bridge Construction Materials | Eco Friendly | York ...

Our eco-friendly timber bridge construction materials of choice are Southern Yellow Pine and Douglas Fir. Environmentally Friendly.

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