The role of smart infrastructure and construction for next generation cities
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1 ISNGI Conference, ICE, London 11 th September 2017 The role of smart infrastructure and construction for next generation cities Robert Mair Department of Engineering University of Cambridge
2 What makes a next generation city in which citizens wish to live? Environment Health & Well-being Culture Recreation Education and Employment Energy Transportation & Mobility Infrastructure Physical & Digital
3 What is Smart Infrastructure? Smart infrastructure responds intelligently to changes in its environment, with the ability to influence and direct its own delivery, use, maintenance and support Physical Transport Energy Water Telecomms Waste Smart Digital Sensors Internet of things Network IM/GIS Big Data Machine Learning
4 Challenges facing our city infrastructure Age Loading Uncertain future Implications for Risk and Resilience Asset management Design Sue Edwards/ BBC News website
5 Climate change and infrastructure resilience Dawlish, February 2014 Tadcaster, December 2015 Cowley Bridge Railway Junction December 2012
6 Vulnerability of city infrastructure Bridge collapse Minnesota 2007 Metro station collapse Singapore 2004 Flooded electricity sub-station UK 2007 Burst water pipe Stoke Newington 2016
7 I-35W Mississippi River Bridge, Minneapolis 8 lane, steel truss arch bridge, built ,000 vehicles daily
8 I-35W Mississippi River Bridge, Minneapolis 6.05pm Wednesday 1 August killed, 145 injured, ~ 100 cars involved
9 I-35W Mississippi River Bridge, Minneapolis Bowed gusset plates photographed in 2003
10 Smart City Infrastructure - The Vision Source: The Economist, Dec 2010
11 Recent developments in sensor technologies provide major new opportunities for ensuring resilient infrastructure
12 An Innovation and Knowledge Centre Funded by EPSRC and Innovate UK Mission: Transform the future of infrastructure through smarter information Vision: Enable step changes in construction practice Establish a world-leading sensing and monitoring industry Extend asset life & reduce management costs Phase & Phase
13 22m for 10 years from UK Government and Industry Infrastructure Clients (Owners and Operators) Consultants, contractors and asset managers Technology & information supply chain
14 Four scales of challenge
15 CSIC Approach 1. City scale Modelling urban development Human interaction with infrastructure Smart city standards 2. Asset scale Whole life value approaches to asset management Smart information for asset management, design and construction 3. Sensor scale Distributed fibre optic strain sensors Wireless sensor networks and MEMS devices Energy harvesting sensors without batteries Computer vision
16 Understanding and improving our cities Managing our city assets Field demonstrations & case studies Developing new engineering insights
17 Innovative Fibre Optic Sensing
18 Innovative fibre optic sensing Distributed (Brillouin) fibre optic strain (DFOS) sensing Strained section along the fibre Frequency shift in back-scattered light corresponding to the localised change in strain.
19 Crossrail Europe s largest infrastructure project 21 km of new sub-surface twin-bore railway through London 8 new sub-surface stations
20 Two longitudinal fibre optic loops Radial fibre optic loops at 6m centres Crossrail shaft 30m diameter 40m deep 52m deep walls
21 Innovative fibre optic sensing Crossrail Liverpool Street Station De Battista et al(2015) Image credit: Hawkins\Brown Crossrail
22 3D Finite Element analysis of tunnel junctions - sprayed concrete properties time-dependent, complex - soil properties highly non-linear (Mott MacDonald, Crossrail C121)
23 10.8 m Innovative fibre optic sensing Sprayed concrete tunnel construction 11.1 m
24 Innovative fibre optic sensing Cross-passage excavation Crosspassage 1 Crosspassage 2
25 Innovative fibre optic sensing Cross-passage excavation Standard lining: 20 cm-thick Primary lining (steel-fibre reinforced) Extra 20 cm-thick Primary lining (steel-fibre reinforced) ~ 260 m 3 / cross passage Extra 40 cm-thick Primary thickening (steel-fibre & rebar reinforced) ~ 380 m 3 / cross passage Liverpool Street station 12 cross passages ~ 7700 m 3 concrete
26 Instrumentation DFOS embedded within the tunnel SCL 4 DFOS circuits CP1 CH5 CP2 210 m of fibre optic cables Embedded within SCL Measuring strain and temperature
27 Monitoring results Localised effect demonstrated by fibre optics 3m on either side of CPs Excess thickening SCL (~1/3) Improvements: Less material (~1350 m 3 SCL) Less excavation Less time Safer construction
28 Fibre optic sensor installation to monitor joint movement in London Underground tunnel
29 Traditional asset management of bridges relies heavily on visual observation data Mike O Callaghan Pat Tillman Memorial Bridge, Hoover Dam, AZ Manhattan Bridge, New York
30 Masonry arch bridges 18,000 bridges in the UK are constructed of masonry in uncertain condition 3 instances of partial masonry bridge collapse in the UK in 2015 & 2016 alone
31 Vulnerability of masonry bridges Axle loads today are 2-3 times higher than 19 th century Train cars today are twice as long (24m typical) Many masonry bridges are noticeably damaged Speed restrictions for railway bridges causing delays
32 Marsh Lane railway viaduct in Leeds
33 Structural issue for Leeds masonry railway bridge: cracking around relieving arch Longitudinal crack Settlement of arch Need for train speed restrictions?
34 Sensing for Leeds masonry railway bridge Fibre optics and computer vision Sensors show speed restrictions not necessary Measure dynamic strain (5με error, 250Hz, 320 sensors) Understand load flow in longitudinal and transverse directions Measure arch bending strains, as well as span and crack opening
35 Wireless Sensor Networks and MEMS Devices
36 Wireless sensor networks Mobile 携帯 network 電話網 Gateway ゲートウェイ Sensor センサ Monitoring 管理局 Data flow データの流れ
37 Wireless Sensor Network in London Underground Tunnel Gateway [Ring1685] Crackmeter [ID8972 Ring1689] Inclinometer [ID8981 Ring1689] Inclinometer [ID8961 Ring1689] Inc. Crack. Inc. Inclinometer [ID8921 Ring1689] Inc. Relay [ID0021 Ring1700] Inc. Relay [ID00D1 Ring1700] 37 Inclinometer [ID89D1 Ring1689]
38 Hammersmith Flyover should not cost a halfpenny to maintain over the next hundred years
39 Hammersmith Flyover: wireless sensors on piers Displacement Inclination Strain Temperature RH Top Middle Bottom 39
40 Movement? Hammersmith Flyover Bearing 40
41 MicroElectroMechanical Systems (MEMS) Topologies of MEMS Strain Sensors Ashwin Seshia, Jize Yan and Kenichi Soga
42 Small size and low power Power by 32-bit CPU Accelerometer Temperature Designed and manufactured in UK Humidity Angle Heba Bevan PhD student supervised by Kenichi Soga
43 Deployment of Utterberry sensors on Crossrail sites 1. Royal Mail tunnel at Liverpool street station (excavation of Crossrail Tunnel). 11/2012 2/ Partially-sealed Crossrail C360 Eleanor Street Adits. 04/ / Crossrail demolition C502 and C510 Monitoring escalator and main supporting beams at Moorgate Station 02/2015 Current
44 Innovative Sensing for Resilient City Infrastructure Distributed strain optical fibre systems - Versatile, widely applicable Embedded MEMS sensors Low power and low cost High resolution Energy harvesting Miniature energy harvesting devices Use of low grade energy available in the environment (vibration, wind, pressure fluctuation, heat) Wireless Communication Easy installation Robust networks
45 Intelligent Infrastructure and Condition Monitoring Sensors and smart infrastructure deliver value when they are exploited for managing assets throughout their life roads, tunnels, bridges, sewers, flood defences, buildings Enable full understanding of performance of assets both during construction and throughout design life Greater efficiencies in design and performance, rational strategies for whole-life maintenance and asset management Huge potential for city infrastructure both old and new
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