BridgeEng14-Components.pdf

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Microsoft PowerPoint - BridgeEng14-Components

BRIDGES

Bridge Components

Bridge Components

Marek Salamak

Silesian University of Technology

Department of Roads and Bridges

14

14 Ï BRIDGES

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Department of Roads and Bridges

Today Agenda

£ Approach slabs

£ Pavements and waterproofing

£ Sewage system

£ Railings

£ Expansion joints

£ Bearings

Marek Salamak 2/55

£ Expansion joints

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Department of Roads and Bridges

Approach Slabs

£ The approach slab is a transitional structure between

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the bridge, which has relatively little settlement, and

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the roadway approach, which is subject to varying levels of settlement

£ The approach slab serves as a bridge between

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the roadway and the primary bridge

£ It is intended to reduce the annoying and sometimes unsafe ÐbumpÑ

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that is often felt when approaching and leaving a bridge

Marek Salamak 3/55

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the roadway and the primary bridge

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Department of Roads and Bridges

Approach Slabs Ï Length and Thickness

Length and Thickness

£ The approach slab is designed as a simply supported element

£ It is spanning from bridge abutment to the end that meets the roadway

£ The length of the slab is generally standardized

£ The reinforced-concrete slab is usually about 25 up to 40 cm thick

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It is reinforced with two-way mats of reinforcing steel both top and bottom

Marek Salamak 4/55

Approach Slabs

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It is reinforced with two-way mats of reinforcing steel both top and bottom

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Department of Roads and Bridges

Approach Slabs Ï Settlement Problem

Settlement Problem

£ Settlement of the adjacent fill abutting a bridge is related to

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The geologic properties of the fill material

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The native soil that underlies it

£ Considerations should be given to include

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Composition and compaction of the fill material

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Settlement of the native soil due to the overburden imposed on it

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Drainage conditions of the approaches

Marek Salamak 5/55

Approach Slabs

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Composition and compaction of the fill material

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