Bridge Design ProjectBridge Design Project

Design of a Link Bridge over Upper Design of a Link Bridge over Upper Hanover StreetHanover Street

Detailed DesignDetailed Design

Group NGroup NChris JonesChris Jones

Ella FeekinsElla Feekins

Nikoline HongNikoline Hong

Aims and ObjectivesAims and Objectives

To provide a safe passage for pedestrians and To provide a safe passage for pedestrians and cyclists over Upper Hanover Streetcyclists over Upper Hanover Street

To reduce the use of road level pedestrian To reduce the use of road level pedestrian crossings, thus improving safety in the area and crossings, thus improving safety in the area and traffic flow at Brook Hill roundabout traffic flow at Brook Hill roundabout

To devise an elegant and sustainable design that To devise an elegant and sustainable design that will act as a landmark for the University of Sheffieldwill act as a landmark for the University of Sheffield

To provide a direct route between the major To provide a direct route between the major university developments university developments

LocationLocation

LocationLocation

Direct links to major university developmentsDirect links to major university developments

Does not impede on existing buildingsDoes not impede on existing buildings

Requires no permanent road closuresRequires no permanent road closures

Integrates an existing cycle routeIntegrates an existing cycle route

Requires a long span bridge solutionRequires a long span bridge solution

Cable-stayed BridgeCable-stayed Bridge

Cable-stayed BridgeCable-stayed Bridge

Landmark structureLandmark structure

Integrates into surrounding areaIntegrates into surrounding area

Provides vital links using multiple access Provides vital links using multiple access

pointspoints

Incorporates pedestrian footpaths, cycle Incorporates pedestrian footpaths, cycle

lanes and disabled access pointslanes and disabled access points

Ramp DesignRamp Design

EC3 designEC3 design

DeckDeck Simply supportedSimply supported

Typical span 8mTypical span 8m

Flexible end plate connections using M20 ‘hollo-bolts’Flexible end plate connections using M20 ‘hollo-bolts’

ColumnsColumns 203x203UC60 sections203x203UC60 sections

Simple connectionsSimple connections

Lateral stability provided by diagonal bracingLateral stability provided by diagonal bracing

Ramp Ramp DesignDesign

RAMP ELEVATION

Bridge DeckBridge DeckStatic AnalysisStatic Analysis

Loading:Loading: - Permanent:- Permanent: Self weight (including deck plate) Self weight (including deck plate)

- Imposed:- Imposed: 5kN/m2 5kN/m2

- Wind:- Wind: Max 0.8kN/m2 (acting transversely or in uplift) Max 0.8kN/m2 (acting transversely or in uplift)

Bridge DeckBridge Deck

Dynamic AnalysisDynamic Analysis Simplified modelSimplified model

No mode near pedestrian No mode near pedestrian

mode frequencies mode frequencies

ModeMode Natural Natural FrequencyFrequency

11 3.915 Hz3.915 Hz

22 5.548 Hz5.548 Hz

33 5.895 Hz5.895 Hz

Bridge DeckBridge Deck

Thermal AnalysisThermal Analysis TemperatureTemperature ExpansionExpansion

-18°C-18°C -12mm-12mm

20°C20°C 0mm0mm

85°C85°C 40mm40mm

Bridge deck requires a movement joint

Roller joint will be positioned at one support

TowersTowers

TowerTower Designed as 15m Designed as 15m

cantilever (concrete-cantilever (concrete-filled circular hollow filled circular hollow section)section)

Maximum bending Maximum bending moment 9000kNm moment 9000kNm at baseat base

Column tapers from Column tapers from 1500mm to 500mm, 1500mm to 500mm, 25mm wall 25mm wall thicknessthickness

No incline due to No incline due to space issuesspace issues

Cables and BaseCables and BaseCablesCables

Maximum cable tension 366kNMaximum cable tension 366kN

Tieback tension 2736kNTieback tension 2736kN

50mm diameter50mm diameter

High tensile strength steelHigh tensile strength steel

BasesBases Treated as 6m tall, reinforced concrete shell, around base of Treated as 6m tall, reinforced concrete shell, around base of

.. tower tower

Slab: 145 deep, T10 @ 250 centres (T8 @ 300 secondary)Slab: 145 deep, T10 @ 250 centres (T8 @ 300 secondary)

Beams: 500x200, 4T10 bars with T8 links @ 300 centresBeams: 500x200, 4T10 bars with T8 links @ 300 centres

Columns: 800x200, 4T10 bars with T8 links @ 300 centresColumns: 800x200, 4T10 bars with T8 links @ 300 centres

Assumed to act as an encastre joint for the towerAssumed to act as an encastre joint for the tower

ConstructionConstructionPhased constructionPhased construction

Construct reinforced concrete basesConstruct reinforced concrete bases Transport individual prefabricated deck sections to siteTransport individual prefabricated deck sections to site Install ramp columns, bracing and deck (giving safe access to Install ramp columns, bracing and deck (giving safe access to

tower bases)tower bases) Erect support towersErect support towers Connect deck sections in series and anchor support cables in Connect deck sections in series and anchor support cables in

towertower

Large cranes will be requiredLarge cranes will be required

Difficult to maintain two lanes of trafficDifficult to maintain two lanes of traffic

Temporary stability needs to be provided to bridge deck Temporary stability needs to be provided to bridge deck during constructionduring construction

SustainabilitySustainabilityEnvironmentalEnvironmental

Durable and low-maintenance designDurable and low-maintenance design Limited range of material optionsLimited range of material options

Locally source steel and concrete aggregateLocally source steel and concrete aggregate

Reduce transport and waste during constructionReduce transport and waste during construction Provides link to existing cycle pathProvides link to existing cycle path

SocialSocial Provides direct links to major university developmentsProvides direct links to major university developments Incorporates pedestrian footpaths, cycle lanes and disabled Incorporates pedestrian footpaths, cycle lanes and disabled

access pointsaccess points

EconomicEconomic High initial cost may be mitigated using advertisingHigh initial cost may be mitigated using advertising Low running costsLow running costs Encourages improvement in local economyEncourages improvement in local economy

ConclusionConclusion

Landmark Landmark StructureStructureProvides direct Provides direct linkslinksSocially inclusiveSocially inclusive