BridgeEng16-Timber.pdf

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Microsoft PowerPoint - BridgeEng16-Timber

BRIDGES

Timber Bridges

Timber Bridges

Marek Salamak

Ziegenwerder Bridge

Frankfurt (Oder)

Silesian University of Technology

Department of Roads and Bridges

16

16 Ï BRIDGES

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Department of Roads and Bridges

Today Agenda

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Introduction to timber bridges

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Properties of wood and wood products

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Types of timber bridges

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Department of Roads and Bridges

Introduction to Timber Bridges

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Wood is one of the earliest building materials

¡

With its natural physical properties it has been used more because of tradition

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The structural use of wood materials has increased steadily recently

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Wood has been widely used for short- and medium-span bridges

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Although wood has the reputation of being a material that provides only

limited service life

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It can provide long-standing bridge structures when properly protected

from moisture

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Although wood has the reputation of being a material that provides only

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Department of Roads and Bridges

Timber as a Bridge Material

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Some of the advantages of wood as a bridge

material include

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Strength, Light weight, Constructability

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Energy absorption , Economics, Durability, Aesthetics

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Three primary disadvantages

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Decay, Insect attack, Combustibility

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Wood bridges require no special equipment for

construction

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Wood is a naturally durable material resistant to

freezeÎthaw effects

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Large-size timbers provide good fire resistance

(natural charring)

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Three primary disadvantages

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Department of Roads and Bridges

Past, Present, and Future of Timber Bridges

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The first bridges built by humans were probably constructed with wood

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100 years ago, wood was still the dominant material used in bridges

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Important advances were made in wood fastening systems and

preservative treatments

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Glued-laminated timber was introduced in the mid-20th century

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8% (37 000) of the bridges in USA having spans greater than 6.10 m

are constructed entirely of wood

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Glued-laminated timber was introduced in the mid-20th century

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