Bridge Design Project

siennatearfulUrban and Civil

Nov 25, 2013 (3 years and 11 months ago)

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Bridge Design Project


Design of a Link Bridge over Upper
Hanover Street


Detailed Design

Group N

Chris Jones

Ella Feekins

Nikoline Hong



Aims and Objectives

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


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


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


To provide a direct route between the major
university developments

Location

Location

Direct links to major university developments

Does not impede on existing buildings

Requires no permanent road closures

Integrates an existing cycle route

Requires a long span bridge solution

Cable
-
stayed Bridge

Cable
-
stayed Bridge

Landmark structure

Integrates into surrounding area

Provides vital links using multiple access
points

Incorporates pedestrian footpaths, cycle
lanes and disabled access points


Ramp Design

EC3 design

Deck


Simply supported


Typical span 8m


Flexible end plate connections using M20 ‘hollo
-
bolts’

Columns


203x203UC60 sections


Simple connections


Lateral stability provided by diagonal bracing

Ramp
Design

RAMP ELEVATION

Bridge Deck

Static Analysis



Loading:




-

Permanent:


Self weight (including deck plate)




-

Imposed:


5kN/m2




-

Wind:


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

Bridge Deck

Dynamic Analysis


Simplified model


No mode near pedestrian
mode frequencies

Mode

Natural
Frequency

1


3.915 Hz

2

5.548 Hz

3


5.895 Hz

Bridge Deck

Thermal Analysis

Temperature

Expansion

-
18
°
C


-
12
mm


20
°
C


0
mm

85
°
C


40
mm


Bridge deck
requires a
movement joint


Roller joint will be
positioned at one
support

Towers

Tower


Designed as 15m
cantilever (concrete
-
filled circular hollow
section)


Maximum bending
moment 9000kNm
at base


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


No incline due to
space issues

Cables and Base

Cables


Maximum cable tension 366kN


Tieback tension 2736kN


50mm diameter


High tensile strength steel

Bases


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

tower


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


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


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


Assumed to act as an encastre joint for the tower

Construction

Phased construction


Construct reinforced concrete bases


Transport individual prefabricated deck sections to site


Install ramp columns, bracing and deck (giving safe access to
tower bases)


Erect support towers


Connect deck sections in series and anchor support cables in
tower

Large cranes will be required

Difficult to maintain two lanes of traffic

Temporary stability needs to be provided to bridge deck
during construction



Sustainability

Environmental


Durable and low
-
maintenance design


Limited range of material options

Locally source steel and concrete aggregate

Reduce transport and waste during construction


Provides link to existing cycle path

Social


Provides direct links to major university developments


Incorporates pedestrian footpaths, cycle lanes and disabled
access points

Economic


High initial cost may be mitigated using advertising


Low running costs


Encourages improvement in local economy

Conclusion

Landmark
Structure

Provides direct
links

Socially inclusive