bs 6349 and the eurocodes - pianc british · pdf file5 – loads, movements ... redraft...

BS 6349: “Maritime Works”

Advancing on Firm Foundations 13th February 2017

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BS 6349 and the Eurocodes

Simon Burchett

Associate Director

1

Dealing with Waves and Coastal Structures



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Presentation overview

BS 6349 Part 1-2

BS 6349 Part 7

EN 1991-1-8 (and ISO 21650)



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BS 6349 Part 1-2

3



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BS 6349 Part 1-2

Current status

What has changed?

Waves, currents and coastal structures

Precursor to new Eurocode………….



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BS 6349-1-2

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

Sea State (a very

extensive section) Loads movements and

vibrations

+ FACTORS



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Part 1 Section 4 (Sea state) included:

Waves

Currents

Water-levels

BS 6349-1-2



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BS 6349-1-2 Part 1 Section 5 (Loads) included:

Wind, waves, currents, water-levels

Snow and ice

Earthquakes

Berthing and mooring

Container and cargo handling

WcPc

Mc



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BS 6349-1-2

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



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BS 6349-1-2

The new Part 1-2

1 – General

2 – Combinations of actions & structural design

3 – Waves and water level conditions

4 – Actions, loads & hydraulic responses

Informative Annexes (approx ½)



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BS 6349-1-2

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

http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.awtworldwide.com/products/news/douglas-sea-state-3-london-arbitration-award/&ei=pNfgVNekMYP1UJbFgrgO&bvm=bv.85970519,d.d24&psig=AFQjCNGv2kWKgWm4hj-jnMpiiY4ff6gGZg&ust=1424107740846746



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BS 6349-1-2

Wave transformation

General

Channel effects

Bathymetry

Morphology

Design event probability

Life Vs risk

Independent

Dependent

OWI 1909

Joint Probability Analysis using JOINSEA

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3

WL (m LAT)

Hm

0 (m

)

data JS,RP=1yr JS,RP=5yr JS,RP=20yr JS,RP=100yr



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BS 6349-1-2

Wave-structure interaction

Breakwaters/ walls

Harbours

Numerical & physical models

CFD

2D/ 3D

http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.islandnet.com/~see/weather/almanac/arc2004/alm04jun.htm&ei=Cd3gVPH8FIGvUfjzg8AC&bvm=bv.85970519,d.d24&psig=AFQjCNH8v1qKRaI0vUQMYMZ-AY1VzzjEgw&ust=1424109084351866



http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.lancasterguardian.co.uk/news/local/autumn-start-for-10m-morecambe-sea-wall-upgrade-1-6652323&ei=XN_gVI2VJoHkUMyjg_AH&bvm=bv.85970519,d.d24&psig=AFQjCNE5l3qIEOKH5csvb7m17LIOjW1vVQ&ust=1424109770295113



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BS 6349-1-2

Current actions

Propeller wash

Vertical slender structures

Flow induced oscillations

http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.dailymail.co.uk/news/article-2514117/Blackout-fears-rise-4bn-offshore-wind-farm-scrapped.html&ei=D-zgVNyuKcf2UICYhPAE&bvm=bv.85970519,d.d24&psig=AFQjCNHGaF9oV8rbi1rI-G4TWv7O3a4wzg&ust=1424113004508653



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BS 6349-1-2 Wave actions

Slender structures

Vertical/ inclined cylindrical

Sub-sea elements

Large structures

Wave action on walls

Wave action on horizontal structures

Wave action on crest walls

Wave action on floating bodies



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BS 6349-1-2 - 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

Simon Burchett

John Fenton

Mark Calverley

Dominic Hames

Peter Hunter

Peter Hawkes

Hydraulic/ environmental actions:

Simon Burchett

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



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BS 6349 Part 7

(Breakwaters)

16



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BS 6349-7

Existing Part 7

Scope of revision

Other considerations



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BS 6349-7

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



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BS 6349-7

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 structures?

Buoyancy analysis?

RC detailing?

Rock durability testing?

Concrete mix design?



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BS 6349-7

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 structures

W178 1998 & EurOtop 2007 (& 2016)

Single-layer systems – tighter standards?

Health and safety



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BS 6349-7

Resource availability?

Materials – rock?

Construction experience?

Single-layer/ GPS positioning?

Seismic/ geotech response

Standard compatibility

ISO 21650

EN 13383

EN 1991-1-8………….!!



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EN 1991-1-8

(Coastal structures)

22



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New Eurocode (coastal structures)

Background

Current status



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Eurocodes are being amended and extended (2nd generation)

E.g. new Eurocode on structural glass

‘Vienna Agreement’ – Eurocodes not to be developed independently

or duplicate ISO’s, e.g.:

Icing of structures

Actions from waves and currents on coastal structures




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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 1991-1-8 (Waves and currents)

CEN/TC250/SC1/WG6




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EN 1990

EN 1991

EN 1992 EN1993 EN 1994

EN 1995 EN1996 EN 1999

EN 1998 EN 1997

0 – Basis of structural design

1 – Actions on structures

2 – Concrete structures

3 – Steel structures

4 – Composite structures

5 – Timber structures

6 – Masonry structures

9 – Aluminium structures

7 – Geotechnical design

8 – Earthquake resistance




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EN 1991 1 – Actions on structures

EN 1991-1-1: Densities, self weight and imposed loads

EN 1991-1-2: Actions on structures exposed to fire

EN 1991-1-3: Snow loads

EN 1991-1-4: Wind loads

EN 1991-1-5: Thermal loads

EN 1991-1-6: Actions during execution

EN 1991-1-7: Accidental loads

EN 1991-1-8: Wave and current actions on coastal structures

EN 1991-2: Traffic loads on bridges

EN 1991-3: Actions induced by cranes

EN 1991-4: Actions in silos and tanks


The odd one out?



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Informal poll:

1) Who is aware of ISO 21650:2007 ‘Wave and current actions on coastal

structures’?

2) Who has made use of ISO 21650?




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ISO 21650 – content/ scope

Water-levels/ waves/ currents

Waves/ currents on structures

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)




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SC1.T7 – response to mandate M/515

Task name: EN 1991-1-8 (Waves and currents)

Deliverable: Conversion of ISO 21650:2007 to EN-ISO 21650

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’




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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 structures, complexity is high’

‘Floating structures 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 structures to be held outside scope,

to be based on rather than conversion of ISO’

Focus on buildings as opposed to maritime infrastructure




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EN 1991-1-8 is coming

We can shape it

Share experience/ lessons learned

Share concerns/ identify opportunities

Offer expertise in a specialist subject

Offer general expertise

Contact:

[email protected]


bs 6349 and the eurocodes - pianc british · pdf file5 – loads, movements ... redraft...

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