New EXAP standards - ppa-europe.eu · EN 15254-5, Extended application of results from fire resistance tests – Non-loadbearing walls – Part 5: Metal sandwich panel construction

Dick Karlsson / 17.9.2010

New EXAP standards Extended Application of fire resistance tests

Content

Background regarding fire safety

European test methods and classification

Fire Resistance tests

EXAP standards

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More fires today?-- Today we have more fires than before-- Fires are bigger and more costly than before

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Out on the market

New test methods and classification that are common in whole Europe.New materials is coming up on the market.Smoke and toxic gases are usually the main reason for deaths. Toxic gases are not regulated at allA lot of confusion when we are moving from our well known national systems to a common European system

HAVE THE FIRE SAFETY INCREASED?


Case Dalco Foods

Objectives of global fire safety design

To guarantee life safety for people in the building as well as fire-fighters

To prevent losses in terms of damaged buildings and interruption of business activities

To protect the environment from hazardous emissions

Content




EXAP standards


Classification & Methods

Tests and classifications do not always show what happens in real situations.

Classification is more a system to rank different products and solutions.

The real construction is seldom the same as the tested one. Planning of details is important.

We have to remember the importance of right installation at site also.

Everything can not be tested. There must be place for common sense and engineering. The EXAP standards give some rules and guidelines for this.


Classification of fire resistance, EN 13501-2

I Insulationaverage temperature risemaximum temperature rise

E Integrityignition of cotton padcracks and openingsoccurrence of sustained flaming on the unexposed side

R Load bearing capacitylimiting deformationlimiting rate of deformation

M Mechanical actionresistance to impact

EI, REI and time 15, 30, 45, 60, 120 ... EI 60, REI 30

Content




EXAP standards


Fire resistance

Classification of Reaction to Fire EN 13501-1

Classification of fire resistance, EN 13501-2EN 1363-1, General requirementsEN 1363-2, Alternative and additional proceduresEN 1364-1, Non-loadbearing wallsEN 1364-2, Non-loadbearing ceilings

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Fire resistance test

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Fire resistance test

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Content




EXAP standards


EXAP standards for sandwich panels

EN 15254-5, Extended application of results from fire resistance tests – Non-loadbearing walls – Part 5: Metal sandwich panel construction

prEN 15254-7, Extended application of results from fire resistance tests – Non-loadbearing ceilings – Part 7: Metal sandwich panel construction

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EXAP standards situation

EN 15254-5, Ready and published 2009.

prEN 15254-7, Final draft ready and sent to CEN (May 2010) for progressing to formal vote.

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EXAP standards technical issues

Guidelines and rules for material changescoatings, metals, adhesive and core

Guidelines and rules for constructional changesspan length, orientation, dimensions, joint, fixing

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Assumptions in the extended application

The wall is assumed to be exposed on the entire face of one side to the standardised

heating conditions given in the EN 1363-1 fire resistance test specification;

The structure above and below the wall does not deflect vertically during the fire

exposure period; this simulates the non-deflecting nature of the test frame which

forms part of the furnace test apparatus;

NOTE In reality constructions deflect and this should be taken into account when

designing the building and planning the constructional details so that no vertical loads

are applied to the wall.

After delamination of the fire-exposed facing the dead load of the panels is carried by

a support structure to which the ends of the panels are attached;

The support structure has at least the same loadbearing capacity R of the resistance

to fire performance as the wall regarding integrity;

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Behavior of sandwich panels in fire

Orientation of panels

Valid for both horizontal and vertical joints between panels (but only up to 4 m span length).For horizontal installation the height of the wall in the end-use application (provided that each panel is fixed to the bearing structure in such a way that the load is not accumulated from above to the lower parts of the wall) can be freely increased providing that the panels in the reference test are fixed at both ends and have a free edge at the top.For vertical installation the length of the wall in the end-use application can be freely increased providing that boundary conditions in the reference test are as described in EN 1364-1.

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Thickness interpolation

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Span length for wall constructionsJoint constructionTo be able to do an extension in the span length above 4 m there shall be an overrun of at least 20 % subject to a minimum 10 min compared to the classification.

Fixing systemBy vertical mounting orientation: Forces are acting at one face, but both faces have to be designed for the same force as fire can be from each direction. Forces acting at the top of the panels:

Tensile forces: Ft,Ed = L b (q + g)

Shear forces: Fv,Ed = (L b q)/2

By horizontal mounting orientation: Forces are acting on the extreme fastener at the end of the panels:

Tensile: Ft,Ed = (L b q)/2

Shear: F1 = (L b q)/2 F2 = Lb(q + gL/8b)

Fv,Ed = (F12 + F2

2 )1/2

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Span length examples

23

Panel type

Panel thickness, mm

Maximum spans for fire‐rated walls, m

EI 15 EI 30 EI 45 EI 60 EI 90 EI 120 EI 180 EI 240

A

80 4 4 100 9 9 4 120 9 9 4 4 150 10 10 4 4 4 4 175 10 10 4 4 4 4 200 10 10 4 4 4 4 4

240 10 10 10 10 10 10 10 4

B

50 4

80 (6) 4 4

100 11 10 10 4

120 12 10 10 (6) 4

150 12 10 10 (8) (6) 4

175 12 12 10 (10) (8) 4 4

200 12 12 12 12 12 4 4 4

240 12 12 12 12 12 12 12 (6)

Behavior of sandwich panel ceilings in fire

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Fixing systems in test and practice

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Heating conditions

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If a test is made according to the standard configuration in Annex B with exposure from below, the test result is directly valid also for exposure from above for panels with symmetrical joint geometry in cases according to figures B.1 A, B.1 B and B.1 E. For cases according to figures B.1 C, B.1 D and B.1 F it must be assured that the support structure and fixing systems above the ceiling are protected in such a way that the temperature increase in these will not influence the behaviour of the ceiling panels and that the load-bearing capacity of these is enough not to collapse during the entire resistance to fire period of the ceiling.

Span length of ceilings

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To be able to do an extension in the span length there shall be an overrun of at least 20 %

subject to a minimum 10 minutes compared to the classification.

The ability of the whole panel assembly to resist collapse must be assessed when the

adhesive bond fails on the exposed side and the panels lose their flexural strength. To resist

collapse the ends of the panel facings shall be secured to the structure (see typical solutions

in Appendix B). The strength of these suspension details (e.g. steel cleats with fastenings)

shall be able to carry the dead loads at the temperatures they attain from an increased load

of a longer span panel. This can be achieved by increasing the amount of fixings based on

the rules and calculation method given in Annex C of this standard.

The aspect of integrity to be assessed shall be the ability of joints between adjoining

sandwich panels to resist the passage of fire. This can be handled by limiting the allowable

deflection to be the same as the maximum deflection at failure in the test. The rules and

calculation method are given in Annex C of the standard.

Why don’t we all use PAROC panels?

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Documents

New EXAP standards - ppa-europe.eu · EN 15254-5, Extended application of results from fire resistance tests – Non-loadbearing walls – Part 5: Metal sandwich panel construction