Bridge Design Project Design of a Link Bridge

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 EC 3 design Deck n Simply supported n Typical span 8 m n Flexible end plate connections using M 20 ‘hollo-bolts’ Columns n 203 x 203 UC 60 sections n Simple connections n Lateral stability provided by diagonal bracing

Ramp Design RAMP ELEVATION

Bridge Deck Static Analysis Loading: - Permanent: Self weight (including deck plate) - Imposed: 5 k. N/m 2 - Wind: Max 0. 8 k. N/m 2 (acting transversely or in uplift)

Bridge Deck Dynamic Analysis n Simplified model n No mode near pedestrian mode frequencies Mode 1 2 3 Natural Frequency 3. 915 Hz 5. 548 Hz 5. 895 Hz

Bridge Deck Thermal Analysis Temperature Expansion -18°C -12 mm 20°C 0 mm 85°C 40 mm n n Bridge deck requires a movement joint Roller joint will be positioned at one support

Towers Tower n n Designed as 15 m cantilever (concretefilled circular hollow section) Maximum bending moment 9000 k. Nm at base Column tapers from 1500 mm to 500 mm, 25 mm wall thickness No incline due to space issues

Cables and Base Cables n Maximum cable tension 366 k. N n Tieback tension 2736 k. N n 50 mm diameter n High tensile strength steel Bases n Treated as 6 m tall, reinforced concrete shell, around base of tower. n Slab: 145 deep, T 10 @ 250 centres (T 8 @ 300 secondary) n Beams: 500 x 200, 4 T 10 bars with T 8 links @ 300 centres n Columns: 800 x 200, 4 T 10 bars with T 8 links @ 300 centres n Assumed to act as an encastre joint for the tower

Construction Phased construction n Construct reinforced concrete bases n Transport individual prefabricated deck sections to site n n n 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 n n Durable and low-maintenance design Limited range of material options Locally source steel and concrete aggregate Reduce transport and waste during construction n Provides link to existing cycle path Social n n Provides direct links to major university developments Incorporates pedestrian footpaths, cycle lanes and disabled access points Economic n n n High initial cost may be mitigated using advertising Low running costs Encourages improvement in local economy

Conclusion Landmark Structure Provides direct links Socially inclusive