BS 6349 and the Eurocodes
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1 BS 6349 and the Eurocodes Dealing with Waves and Coastal Structures Associate Director 1
2 Presentation overview BS 6349 Part 1-2 BS 6349 Part 7 EN (and ISO 21650)
3 BS 6349 and the Eurocodes BS 6349 Part 1-2 3
4 BS 6349 Part 1-2 Current status What has changed? Waves, currents and coastal Precursor to new Eurocode.
5 BS Original Part 1 (2000) New Part 1 1 General 1-1 Planning and design for operations (2013) 2 Environmental considerations 1-2 Assessment of actions (2016) 3 Operational considerations 1-3 Geotechnical design (2012) 4 Sea state 1-4 Materials (2013) 5 Loads, movements and vibrations 6 Geotechnical considerations 7 Materials + FACTORS Sea State (a very extensive section) Loads movements and vibrations
6 BS Part 1 Section 4 (Sea state) included: Waves Currents Water-levels
7 BS Part 1 Section 5 (Loads) included: Wind, waves, currents, water-levels Snow and ice Earthquakes Berthing and mooring Container and cargo handling Pc Wc Mc
8 BS Actions from other parts E.g. Part 7 New Guidance (PIANC, CIRIA) New Standards (ISO, EN, ROM, EAU) New Technology Wave data & modelling (spectral) Cargo handling, berthing & mooring
9 BS The new Part General 2 Combinations of actions & structural design 3 Waves and water level conditions 4 Actions, loads & hydraulic responses Informative Annexes (approx ½)
10 BS Wave characteristics Think ahead Spectral/ non-spectral Form and motion Nearshore processes Breaking Offshore wave climate Sources Understanding Satellite based models Empirical hindcasts Measured VOS Extrapolation
11 Hm0 (m) Dealing with waves and coastal BS Wave transformation General Channel effects Bathymetry Morphology Design event probability OWI 1909 Joint Probability Analysis using JOINSEA Life Vs risk Independent Dependent WL (m LAT) data JS,RP=1yr JS,RP=5yr JS,RP=20yr JS,RP=100yr
12 BS Wave-structure interaction Breakwaters/ walls Harbours Numerical & physical models CFD 2D/ 3D
13 BS Current actions Propeller wash Vertical slender Flow induced oscillations
14 BS Wave actions Slender Vertical/ inclined cylindrical Sub-sea elements Large Wave action on walls Wave action on horizontal Wave action on crest walls Wave action on floating bodies
15 BS Acknowledgements Initial thinking: William Allsop Jan De Waal Terry Hedges Dick Thomas Partial factors: Steve Osborn Adrian Douglas David Smith Graeme Walker Sea-state: Jo Evans John Fenton Mark Calverley Dominic Hames Peter Hunter Peter Hawkes Hydraulic/ environmental actions: Simon Everitt Giovanni Cuomo Ian Cruickshank Gareth Evans Operational actions: Steve Osborn Chris Boysons David Veale Mark McBride Jack Pappin Ziggy Lubkowski Edmund Booth Helge Frandsen Roger Allen Andy Cook Peter Stebbings
16 BS 6349 and the Eurocodes BS 6349 Part 7 (Breakwaters) 16
17 BS Existing Part 7 Scope of revision Other considerations
18 BS Existing Part 7 Very widely used Drew on considerable experience of UK Engineers Drafted during a time of change Science/ technology Design approaches Practical lessons learned
19 BS Scope of revision What should it cover? Breakwaters for maritime works Sea-walls/ revetments for maritime works? Sea-walls/ revetments/ breakwaters for coastal/ flood defence? Rubble-mound rock/ conc/ reshaping/ bermed Vertical block-wall/ RC caisson Wave screens? Floating breakwaters/ attenuators? Other coastal? Buoyancy analysis? RC detailing? Rock durability testing? Concrete mix design?
20 BS Other considerations Changes since 1991? Survey technology, e.g. posi-block CIRIA 1991 & 2007 rock/ concrete rubble-mounds CIRIA 2010 maritime concrete PIANC WG s DEFRA/ EA 2012 toe W & EurOtop 2007 (& 2016) Single-layer systems tighter standards? Health and safety
21 BS Resource availability? Materials rock? Construction experience? Single-layer/ GPS positioning? Seismic/ geotech response Standard compatibility ISO EN EN !!
22 BS 6349 and the Eurocodes EN (Coastal ) 22
23 New Eurocode (coastal ) Background Current status
24 New Eurocode (coastal ) Eurocodes are being amended and extended (2 nd generation) E.g. new Eurocode on structural glass Vienna Agreement Eurocodes not to be developed independently or duplicate ISO s, e.g.: Icing of Actions from waves and currents on coastal
25 New Eurocode (coastal ) Eurocodes 450 technical committees, e.g.: CEN/ TC 268 Cryogenic vessels CEN/ TC 364 High chairs CEN/ TC 409 Beauty salon services CEN/ TC 377 Air traffic management CEN/ TC 250 Structural Eurocodes CEN/TC250/SC1.T7 EN (Waves and currents) CEN/TC250/SC1/WG6
26 New Eurocode (coastal ) EN Basis of structural design EN Actions on EN 1992 EN1993 EN 1994 EN 1995 EN1996 EN 1999 EN 1997 EN Concrete 3 Steel 4 Composite 5 Timber 6 Masonry 9 Aluminium 7 Geotechnical design 8 Earthquake resistance
27 New Eurocode (coastal ) EN Actions on The odd one out? EN : Densities, self weight and imposed loads EN : Actions on exposed to fire EN : Snow loads EN : Wind loads EN : Thermal loads EN : Actions during execution EN : Accidental loads EN : Wave and current actions on coastal EN : Traffic loads on bridges EN : Actions induced by cranes EN : Actions in silos and tanks
28 New Eurocode (coastal ) Informal poll: 1) Who is aware of ISO 21650:2007 Wave and current actions on coastal? 2) Who has made use of ISO 21650?
29 New Eurocode (coastal ) ISO content/ scope Water-levels/ waves/ currents Waves/ currents on Waves on breakwaters Waves on vert/comp breakwaters Waves on dykes and seawalls Waves/currents on cylinders Waves & floating breakwaters Waves on screens Probabilistic analysis Uncertainties Reliability assessment 14 pages (+ 85pp informative annexes)
30 New Eurocode (coastal ) SC1.T7 response to mandate M/515 Task name: EN (Waves and currents) Deliverable: Conversion of ISO 21650:2007 to EN-ISO Outline scope: Be as clear as possible Use simple routes through doc Avoid additional empirical rules Task description: Redraft ISO in Eurocode style adjust foreword & intro Consider stakeholder comments Decide whether some annexes become normative Include, if relevant, up-to-date complementary info Key benefit: As a result the whole package of design of maritime works will become an integral part of the Eurocodes family
31 New Eurocode (coastal ) Justification/ need: Residential projects toward sea side have become common EN for structural design exists EN for geotechnical design exists What about wave and current actions? To achieve a complete standard covering all coastal, complexity is high Floating proposed for residential areas, have a high degree of (non-linear) dynamic behaviour should be included? Unclear definition of scope, mandate needs to be updated, some types of to be held outside scope, to be based on rather than conversion of ISO Focus on buildings as opposed to maritime infrastructure
32 New Eurocode (coastal ) EN is coming We can shape it Share experience/ lessons learned Share concerns/ identify opportunities Offer expertise in a specialist subject Offer general expertise Contact: simon.burchett@wspgroup.com
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