CE-marking of Connectors and Fasteners used in timber structures

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CE-marking of Connectors and Fasteners used in timber structures

Documentation according to

• ETAG 015 Three-dimensional nailing plates

or

• Harmonized European Standards

• Gains and difficulties (challenges)

by Jørn Ipsen, Simpson Strong-Tie A/S. Denmark


SIMPSON STRONG-TIEPARENT COMPANY


Simpson Strong-Tie Europe


Product range


Europe. The present situation


Europe.The present situation

• The Nordic countries have for many years had design codes very similar to the Eurocodes based on limit state design.

• A new German code for Timber Structures ( DIN 1052: 2004-08) similar to EC5 is now in force.

• The possibility to use Eurocodes together with National Annexes (NA) exists today.

But

Each country still have their own • Standards. (A lot of EN standards have been

implemented)• Building regulations• Building design codes• 5 countries: Sweden, Finland, Ireland, UK and

Portugal have not accepted the CE-mark as compulsory.


CPD The Essential Requirements

• Mechanical Resistance and Stability• Safety in case of Fire• Hygiene, Health and the Environment• Safety in Use• Protection against Noise• Energy Economy and Heat Retention

The requirements do not refer to the construction products but to the construction works in which the products will be incorporated.


CE - marking

Mandate from the European Commission

Harmonized Standard (hEN)

Guideline for European Technical Approval (ETAG)

Attestation of conformity

CE-marking

European Technical Approval (ETA)

Attestation of conformity

EOTA

The CE marking is not a quality mark; it demonstrates only that products meet the legal requirements necessary for them to be placed on the market by complying with the applicable technical specifications.

CEN


Connectors and Fasteners

hEN: prEN 14545: Timber structures- Connectors-RequirementsEN 912: Timber fasteners – Specifications for connectors for timber (Nailing Plates, Straps and bulldog)

prEN 14592: Timber structures – Dowel-type fasteners – Requirements(Nails and screws)

ETAG 015: Guideline for 3-dimensional nailing plates


CE – marking. ETA

CECE

European Technical ApprovalHarmonized Standard

prEN 14545 ETAG 015


ETAG 015. The Guideline is the cookery bookwith the recipe for an ETA

Guideline

ETA

• Gives a recipe to meet the 6 essential requirements in the CPD

• Gives methods for testing

• Gives criteria’s for evaluation


ETAG 015

Scope:This Guideline covers preformed three-dimensional metal nailing plates with specified fasteners for connections in load-bearing timber structures and for fixing timber structures or wood-based structural members to their support.The specified fasteners include nails, screws, bolts and dowels.


ETAG 015

1: Mechanical resistance and stability

METHODS OF VERIFICATION1. Calculation according to EC52. Calculation assisted by testing3. Testing

GENERALManufacturer shall specify – Intended use:

1. Strength class or Species, grade and surface

2. Wane, allowed or not3. Support or restraint conditions4. Erection procedures5. Gaps


ETAG 015

Calculation

Provided:Connector of a ductile material and:

• Joint has a ductile static behaviour and components have a ductile force-deformation curve

or

• Force distribution statically safe or conservative for joints with brittle failure, e.g. withdrawal of nails or screws

Characteristic material properties modified to relevant load durationRelevant when joint capacity depends on fastener + steel capacity


ETAG 015

Calculations assisted by testing Scope:

To calibrate a theoretical static model against measured capacitiesfrom tests

Conditions:

• Model shall reflect the actual static behaviour

• Model shall be verified for * The type of forces and * The range of their positions * The range of eccentricities* Special consideration to axially loaded nails – nef


ETAG 015

Testing

Testing procedure: EN 26891Density requirements: EN 28970

Density controls fastener capacity !

Two methods for selection of test specimens:• Method 1: Test data for direct calculation of Rk:

ρm ≤ 1,15 ρk ρof 20% ≤ ρk

• Method 2: Test data need to be modified for density before calculation of Rk: 1,05 ρk ≤ ρm ≤ 1,25 ρk

0,9 ρm ≤ ρ ≤ 1,1 ρm for each single timber member

According to EN 338 ρk typically in the range 290 to 350 kg/m3 (C14 – C24)


ETAG 015

Durability

Thickness of zinc coating:

Requirements from Eurocode 5, clause 4.2

Service Class

1 2 3

Nails and screws d ≤ 4 mm

None Fe/Zn 12c Fe/Zn 25c

Steel plates t ≤ 3 mm Fe/Zn 12c Fe/Zn 12c Stainless

Steel plates 3 < t ≤ 5 mm None Fe/Zn 12c Fe/Zn 25c

Steel plates 5 < t None None Fe/Zn 25c


European Technical Approval (ETA)

• An ETA is made for a specific product to a specific manufacturer

• An ETA is based on test of the product and an assessment of the test results compared to the intended use

• The ETA describes the specific requirements to attestation of conformity based on the Factory Production Control System at the specific manufacturer

• An ETA is the harmonized technical specification according to the CPD


ETA-06/0106


Content of the ETA

• Legal basis and general and special conditions

• Definition of the product

• Intended use

• Wood members

• EC5 design or similar national code design

• Service classes

• Other materials than wood

• Assumed working life


Content of the ETA Mechanical resistance and stability

• Safety principles and partial factors

• Load-carrying capacities

• Methods of verification: Calculation, calculation assisted by testing or testing

• Fasteners – nails, screws, bolts

• Corrosion protection/service classes


Content of the ETA Attestation of Conformity

System 2+

• Factory Production Control System (manufacturer)

• Initial type testing (manufacturer)

• 3th part control (notified body)


Declaration of conformity, angle brackets

States conformity to:

•ETA-06/0106 Angle Brackets.

•Factory Production Control(FPC)

Certificate no 06/F007.

•ETAG 015 Three – dimensional

Nailing Plates

jipsen


Characteristic load-carrying capacity

Design basis – general

• Combined forces, splitting, density correction



• Force directions - assumptions




Connectors and Fasteners

hEN: prEN 14545: Timber structures- Connectors-RequirementsEN 912: Timber fasteners – Specifications for connectors for timber (Nailing Plates, Straps and bulldog)

prEN 14592: Timber structures – Dowel-type fasteners – Requirements(Nails and screws)

ETAG 015: Guideline for 3-dimensional nailing plates


prEN 14545: Connectors

EN 912: Timber fasteners –

Specifications for connectors for timber

Type A: Split ring connectors

Type B: Shear plate connectors

Type C: Toothed plate connectors – Bulldog, Geka

Type D: Other connectors


prEN 14545: Connectors

Nailing plates and straps


prEN 14592: Dowel-type Fasteners

• Nails

• Screws

• Staples

• Dowels

• Bolts

For use in timber structures


Products included in prEN 14545 and prEN14592

• Meet the requirements in the standard.

• Attestation of conformity:

System 2+ for connectors

and 3 for fasteners.

• Calculate according to Eurocode 5


CE-marking. Difficulties (challenges)

• Big costs. Initial and also continuously.

• CE-marking not compulsory.

• Queue at the approval bodies.

• Too long “co-existence” period for the total system.

• ETAs on same level Ex. 1: Valid only in one country Ex. 2: Number of force directions

• Further requirements


CE-marking. Gains

• Passport to all European

countries.

• Design load - carrying

capacities for all European

countries based on the

same approval.

• Improved documentation

and product development.

• Improved internal technical

communication.

• More confidence in the market

Date post:	05-Feb-2016
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CE-marking of Connectors and Fasteners used in timber structures

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