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1 edition of Live load distribution on longitudinal glued-laminated timber deck bridges found in the catalog.

Live load distribution on longitudinal glued-laminated timber deck bridges

Fouad Fanous

Live load distribution on longitudinal glued-laminated timber deck bridges

final report : conclusions and recommendations

by Fouad Fanous

  • 287 Want to read
  • 13 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI .
Written in English

    Subjects:
  • Wooden bridges,
  • Testing,
  • Evaluation,
  • Live loads,
  • Load factor design

  • About the Edition

    Over the past few years the United States Department of Agriculture (USDA), Forest Products Laboratory (FPL), and the Federal Highway Administration (FHWA) have supported several research programs. This paper is a result of a study sponsored by FPL, with the objective of determining how truckloads are distributed to the deck panels of a longitudinal glued-laminated timber deck bridge. Currently, the American Association of State Highway and Transportation Officials (AASHTO) LRFD (load and resistance factor design) Bridge Design Specification provides live load distribution provisions for longitudinal glued-laminated timber deck-panel bridges. The AASHTO LRFD live load distribution provisions for longitudinal glued-laminated timber deck bridges were based on the assumption that the bridge deck behaves as one slab and ignores the discontinuity of the bridge deck panels. This study investigated this assumption by using analytical models that validated field test data from several in-service bridges and data from a full-scale laboratory test bridge. The analytical models accounted for the effects of the interface between the deck panels as well as the effects of the transverse stiffener beams on the distribution of the live- load. The analytical live load distribution results above were compared with both the AASHTO LRFD and AASHTO Standard Specifications.

    Edition Notes

    StatementFouad Fanous ... [et al.].
    SeriesGeneral technical report FPL -- GTR-194, General technical report FPL -- GTR-194.
    ContributionsForest Products Laboratory (U.S.)
    Classifications
    LC ClassificationsTG305 .L58 2010
    The Physical Object
    Pagination14 p. :
    Number of Pages14
    ID Numbers
    Open LibraryOL25193687M
    LC Control Number2010532466
    OCLC/WorldCa669187171

      Special attention is paid on the mechanism of load distribution among deck and For bridges constructed of glued laminated timber, field observations indicate that bar force should be checked every 2 years for the The longitudinal displacement caused by live load and dead load must be checked. Live load deflection To calculate. Mot asphalt pavement cracking problems with glued-laminated timber panel decks result from a bridge's structural design. Unless deck panels are mechanically interconnected, wheel loads cause the glued-laminated panels to move independently of each other, especially with the more common transverse glued-laminated timber panel decks. Timber bridges are gaining a resurgence in popularity throughout the United States. There are two basic classifications in timber construction: solid sawn and glued-laminated (glulam). A solid sawn beam is a section of tree cut to the desired size at a saw mill. Solid sawn multi-beam bridges are the simplest type of timber bridge (see Figure 6. Design, Construction, and Testing of Field Implemented Timber Bridge Deck Concepts: Phase III, Forest Products Laboratory; M. Ritter, and D. L. Wood. Live Load deflection of Glued-Laminated Timber Girder Bridges.


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Live load distribution on longitudinal glued-laminated timber deck bridges by Fouad Fanous Download PDF EPUB FB2

The AASHTO LRFD live load distribution provisions for longitudinal glued-laminated timber deck bridges were based on the assumption that the bridge deck behaves as one slab and ignores the discontinuity of the bridge deck panels.

distribution provisions for longitudinal glued-laminated timber deck panel bridges. The AASHTO LRFD live load distribution provisions for longitudinal glued-laminated. timber deck bridges were based on the assumption that the bridge deck behaves as one slab, i.e.

ignoring the discontinuity of the bridge deck : Jeremy James May. Live load distribution on longitudinal glued-laminated timber deck bridges (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Fouad Fanous; Forest Products Laboratory (U.S.).

The AASHTO Standard Specification (AASHTO ) live load distribution factors for longitudinal glued- laminated timber deck bridges were presented based on wheel loads, or half of the total axle load, carried by a single panel.

The equations used for flexure design are listed in Table 1 for a panel under single or multiple truck loads. glued-laminated timber girders. Live-load distribution fac-tors for exterior girders are determined using the lever rule.

The lever-rule method, for exterior girders, has remained unchanged from the AASHTO Standard Specification to the AASHTO LRFD Specification. The lever rule assumes that the girders act as rigid supports to the bridge.

This paper presents simple relationships for calculating live-load distribution factors for glued-laminated timber girder bridges with glued-laminated timber deck panels. Analytical models were developed using the Ansys 11 finite-element program, and the results were validated using recorded data from four in-service timber bridges.

The effects of the bridge span length, the spacing between girders, and the bridge width on the distribution of the live load. stringer bridges. However, the glued-laminated, longitudinal, timber-deck bridge developed in recent years has been subject to code specifications that do not reflect the favorable load distribution characteristics of the bridge.

Sufficient test data now exist to verify the distribution. Bridge Type: Glued-laminated stringer bri dge Deck Type: Glued-laminated panel decking Beams: x glued-laminat ed stringer, 24F-V3, SP/SP. Dead loads are of constant magnitude and are Live load distribution on longitudinal glued-laminated timber deck bridges book on material unit weights given by AASHTO (Table ).

Note that the minimum design dead load for timber is 50 lb/ft 3 for treated or untreated material. Dead loads are commonly assumed to be uniformly distributed along the length of a structural element (beam, deck panel, and so forth).

The load. These loads are moved transversely to maximize the moments. To determine Live Load moment per unit width of the bridge, calculated total Live Load moment is divided by an equivalent strip width, calculated per equations from AASHTO LRFD Bridge Design Specifications T General Pattern of Moment Distribution Diagram in Deck.

and use of glued-laminated timber for bridge construction (Williamson ). Although economic analyses of timber versus traditional steel and concrete bridges are few, indications are that timber bridges are cost competitive (Behr et al.

In general, timber bridges built in those areas of the country where timber to the deck underside to assist in load distribution. Glulam longitudinal deck bridges are constructed of panels that are /4 to /4 inches deep and 42 to 54 inches wide (Figure ).

Sawn lumber bridges use 2- to 4-inch-wide lumber, 8 to 16 inches deep, that is nailed or spiked together to form a continuous surface (Figure ). deck’ in Glued Laminated Timber Bridges Systems Manual [8] published by AITC. The glulam timber bridge had the following conditions: • Type: longitudinal glulam stringer • Deck: transverse glulam panels • Girders: 24F-V4 • Span length: m (49ft 4-in.) • Roadway Width: m (34ft).

However, the glued-laminated, longitudinal, timber-deck bridge developed in recent years has been subject to code specifications that do not reflect the favorable load distribution characteristics of the bridge. Sufficient test data now exist to verify the distribution behavior.

The purpose of this study was to develop criteria that more. The design criteria for longitudinal deck bridges were developed from research conducted at Iowa State University (ISU). 14,27,28 The primary emphasis of the ISU studies dealt with the lateral live load distribution characteristics for deck panel design.

Empirical methods for stiffener. Glued-laminated timber girder bridges with glued-laminated timber deck panels and longitudinal glued-laminated timber deck bridges were the focus of this paper. Currently, the American Association of State Highway and Transportation Officials LRFD Bridge Design Specification provides live load distribution provisions for glued-laminated timber.

Timber Bridges in the National Bridge Inventory (NBI). The largest proportion of these are longitudinal timber slab span structures. There are numerous reasons why this is the case. That population of longitudinal treated timber slab span structures contains four distinct deck designs.

The purpose of this paper is to discuss several aspects of. Transverse nail laminated and transverse plank timber decks are to be rated using the guidelines in SectionTimber Bridges.

All other types of bridge decks will be rated in compliance with the applicable guidelines within this manual and the AASHTO code. Hand computations will be acceptable.

Chapter 13 Bridge Load Rating Page WSDOT Bridge Design Manual M September In cases where RF for legal loads is less than 1, which would require the bridge to be posted, live load factors may be reduced (interpolated based on ADTT), per Section 6A of the MBE.

Number of Lanes Multiple Presence Factor 1 Lane = This paper presents simple relationships for calculating live-load distribution factors for glued-laminated timber girder bridges with glued-laminated timber deck panels.

Analytical models were developed using the Ansys 11 finite-element program, and the results were validated using recorded data from 4 in-service timber bridges. load resistance factor design (LRFD) basis, as well as convert the standards to metric units.

The goals of this paper are to summarize the technological developments leading to completion of the standard plans and to outline the features of the ASD-based Standard Plans for Hardwood Glued Laminated Timber Highway Bridges (BLC). 42” high rails with 4” openings.

(50 plf. lateral load) Concepts of Modern Timber Bridges Modern Timber Bridges Use of Glued-Laminated Timbers. Modern highway design codes. Structural Engineering Analysis. Ability to optimize bridge design Identifies trouble locations Greatly reduces design time Concepts of Modern Timber Bridges Modern.

Strength III is used as a construction check for steel girder bridges with wind load but no live load. When checking this limit state during a deck pour, use a multiplier of on the wind speed to account for the unlikelihood that a deck would be poured under extremely windy conditions.

Strength IV is not typically used by WisDOT. Ritter, Michael A. Timber Bridges: Design, Construction, Inspection, and Maintenance. Washington, DC: p. Two main types of glulam timber bridges are (i) transverse glulam deck bridges (or glulam girder bridges, Fig. 2a), and (ii) longitudinal glulam deck bridges (or glulam slab bridges, Fig.

2b). The former type of glulam bridge consists of transverse glulam deck panels supported by stringers placed in the longitudinal direction of the bridge.

The dead load is nothing but a self-weight of the bridge elements. The different elements of bridge are deck slab, wearing coat, railings, parapet, stiffeners and other utilities.

It is the first design load to be calculated in the design of bridge. Live Load. The live load on the bridge, is moving load on the bridge throughout its length. profile grade in the deck can be provided by means of a vertical curve. Longitudinal timber deck panels cannot be cambered to offset dead-load deflection.

One of the recognized hazards of a timber bridge is fire. The potential for fire damage can be reduced by the use of large members and components with a low surface-to-volume ratio. The live load is positioned at the longitudinal location that produced the extreme effect, and then it is moved transversely across the bridge width in order to investigate all possibilities of one-lane, two-lane and three-lane design loads.

Brent Phares's research works with citations reads, including: Structural capacity and fatigue performance of ASTM A Grade 50CR steel.

Live load distribution on longitudinal glued-laminated timber deck bridges: final report: conclusions and recommendations; Nanotechnology opportunities in residential and non-residential construction; A comparative study of wood highway sound barriers.

LATERAL LOAD DISTRIBUTION ON TRANSVERSE FLOOR BEAMS IN STEEL PLATE GIRDER BRIDGES by K. Pennings, K. Frank, S. Wood, J. Yura, and J. Jirsa Research Report Research Project EFFECTS OF OVERLOADS ON EXISTING STRUCTURES conducted for the Texas Department of Transportation in cooperation with the. Live-load distribution on glued-laminated timber girder bridges: final report: conclusions and recommendations.

Fanous, Fouad; May, Jeremy; Wipf, Terry; Ritter, Michael. Live load distribution on longitudinal glued-laminated timber deck bridges: final report: conclusions and recommendations.

To determine the live load moment per unit width of the bridge, the calculated total live load moment is divided by a strip width determined using the appropriate equation from Table S The following conditions have to be satisfied when determining live load effects on the deck.

WisDOT Bridge Manual Chapter 45 – Bridge Rating July Introduction Constructed inthe Silver Bridge was an eyebar -chain suspension bridge spanning over.

Live load distribution on longitudinal glued-laminated timber deck bridges final report: conclusions and recommendations / Published: () Advanced composites in bridge construction and repair / Published: (). The major components of bridge loading include dead load, live load, and environmental effects.

In timber bridges, dead load (D.) constitutes about 10 to 20 percent of the total load. The weight of timber is assumed to be 50 lb/ft' and, for the purposes of this paper, a square foot of the deck. Open-Deck Timber Bridge The superstructure for each bridge consists of two longitudinal packed chords, each containing four stringers.

The solid-sawn stringers on the D’Hanis bridge are inches wide by inches deep. The glued laminated stringers have a larger moment of iner-tia, measuring inch wide by 18 inches deep. The. live load distribution on longitudinal glued-laminated timber.

gitudinal glued-laminated timber deck bridges under static and dynamic. tension-compression spring elements were used to model the through bolt, or. More information Free Sample. wood terms - lumber glossary of terms - "c".

Timber bridge hardware; [email protected] Celebrating 35 years of being a proud supplier of quality engineered glued laminated timber products for the transportation industry. Speciality Hardware.

To be used for attaching glulam transverse decking to glulam stringers. Aluminum Deck Bracket. To be used for attaching glulam.

Celebrating 35 years of being a proud supplier of quality engineered glued laminated timber products for the transportation industry. Technical Data The following is a list of available PDF downloadable documents to assist owners and engineers in determining the proper structure for their needs.

Glued-Laminated Timber (Glulam) Bridgestransverse distributor beams are attached with mechanical fasteners to the deck underside to assist in load distribution between the panels. The panels for glulam longitudinal deck bridges are typically to mm deep and to mm wide.

This type of bridge is economical and practical for.Several spans of a year-old open-deck timber railroad bridge on the Southern Pacific Railroad Line (now the Union Pacific) in Southwest Texas were field tested.

The tests were conducted with the sponsorship and cooperation of the Association of American Railroads to determine the vertical live load distribution characteristics of the.Members and Glued Laminated Timber Decks 12 8/6/02 Live Load Distribution 13 8/6/02 LOAD COMBINATIONS 14 8/6/ for loads and forces, the limits of their application, load factors, and load combinations used for the design of new bridges.

The load provisions may also be applied to the structural evaluation and modification of.