ETA L20 ENG - Aedilitia - Consiglio Nazionale delle Ricerche

Transcription

Istituto per le Tecnologie
della Costruzione
Autorizzato e notificato
conformemente all’articolo 10
della Direttiva 89/106/CEE del
Consiglio del 21 dicembre 1988,
relativa all’avvicinamento delle
disposizioni legislative,
regolamentari ed amministrative
degli Stati membri, relativa ai
prodotti da costruzione.
Consiglio Nazionale delle Ricerche
Via Lombardia 49 - 20098 San Giuliano Milanese – Italy
tel: +39-02-9806.1 – Telefax: +39-02-98280088
e-mail: [email protected]
European Technical Approval
Membro EOTA
ETA 13/0868
(English language translation; the original version is in Italian)
Nome commerciale
Trade name
Scala “L20” modelli “L20-2RI-GLE”, “L20-2RI-GLA”,
“L20-2RZ-GLE”, “L20-2RZ-GLA”
“L20” stair kit in the versions: “L20-2RI-GLE”,
“L20-2RI-GLA”, “L20-2RZ-GLE”, “L20-2RZ-GLA”
Beneficiario
Holder of approval
Solidarietà Intrapresa soc. coop. soc. Onlus
Via Campo dei Fiori, 3/b
47122 Forlì (FC) - Italy
Tipologia del prodotto da costruzione
ed utilizzo
Generic type and use of
construction product
Sistema di scale a rampa con doppia fascia laterale
portante
Flight stair kit with double lateral load bearing
string
Validità da/a
Validity from/to
22.06.2013/21.06.2018
Stabilimenti di produzione
Manufacturing plants
Via Campo dei Fiori, 3/b - 47122 Forlì (FC)
Via degli Artigiani, 5 –
48125 Savio (RA) - Italy
Questo Benestare Tecnico Europeo
contiene
This European Technical Approval
contains
16 pagine, inclusi 7 allegati
16 pages, including 7 annexes
____________________________________________________________________________
European Organisation for Technical Approvals
Organisation pour l’Agrément Technique Européen
I
LEGAL BASIS AND GENERAL CONDITIONS
1. This European Technical Approval is issued by Istituto per le Tecnologie della Costruzione Consiglio Nazionale delle Ricerche (called ITC-CNR in the following text) in accordance with:
- Council Directive 89/106/EEC of 21 December 1988 on the approximation of laws, regulations
and administrative provisions of Member States relating to Construction Products1, modified by
the Council Directive 93/68/EEC of 22 July 19932 and by Regulation EC n. 1882/2003 of the
European Parliament and of the Council3;
- DPR 246 of 21/04/934 and DPR 499 of 10/12/975, concerning the implementation of Council
Directive 89/106/EEC;
- Common Procedural Rules for Requesting, Preparing and Granting of European Technical
Approvals set out in the Annex of Commission Decision 94/23/EC6;
- Guideline for European Technical Approval of "Prefabricated stair kits - Part 1: Prefabricated
stair kits in general (excluding severe climatic conditions)", ETAG 008, edition January 2002
(called ETAG 008-01 in the following text).
2. ITC-CNR is authorised to check whether the provisions of this European Technical Approval are
met. Checking may take place in the manufacturing plant. Nevertheless, the responsibility for the
conformity of the products to this European Technical Approval and for their fitness for the intended
use remains with the Holder of the European Technical Approval.
3 This European Technical Approval is not to be transferred to manufacturers or agents of
manufacturers other than those indicated on cover page, or manufacturing plants other than those
as laid down in the context of this European Technical Approval.
4. This European Technical Approval may be withdrawn by ITC-CNR, according to Article 5 (1) of
Council Directive 89/106/EEC.
5. Reproduction of this European Technical Approval including transmission by electronic means shall
be in full. However, partial reproduction can be made with the written consent of ITC-CNR. In this
case partial reproduction has to be designated as such. Texts and drawings of advertising
brochures shall not contradict or misuse the European Technical Approval.
6. The European Technical Approval (ETA) is issued by ITC-CNR in its official language. This version
fully corresponds to the version used by EOTA for circulation. Translations into other languages
have to be designated as such.
1
Official Journal of the European Communities N° L 40, 11.02.1989, p.12
3
Official Journal of the European Union N° 1 L 220,30.10.2003, p.1
4
Gazzetta Ufficiale della Repubblica Italiana n. 170 of 22.07.1993
5
Gazzetta Ufficiale della Repubblica Italiana n. 21 of 10/12/1998
6
ETA 13/0868 L20
2
Page 2 of 16
II
1.
SPECIFIC CONDITIONS OF THE EUROPEAN TECHNICAL APPROVAL
DEFINITION OF PRODUCT, INTENDED USE AND ASSUMED WORKING LIFE
The stair system is composed of a double mm 8 or mm 10 thick plate structure, located both on
the inner and on the outer side of the stair, made of S235JR or stainless AISI 304 steel with
shaped profile, type “I” (versions “L20-2RI-GLE” and “L20-2RI-GLA”) or type “Z” (versions “L202RZ-GLE” and “L20-2RZ-GLA”).
To the double lateral structure, lamellar beechwood steps 40 or 60 mm thick (versions “L202RI-GLE” and “L20-2RZ-GLE”) are fastened through suitable bolting, or, alternatively, pressure
bent mm 3 thick sheet steps (versions “L20-2RI-GLA” and “L20-2RZ-GLA”). The structure can
be fabricated in one single part (for each flight of steps) or in various parts linked together
through dovetail shaped joints. Structures are fixed to the bottom floor at the beginning of the
stair and to the top floor at the landing, in addition intermediate supports are provided for, fixed
to the wall through plugs, installed every six steps as a maximum (see Annex 1) and anyway
where the stair turns on the external side; when the side wall is absent it is possible to make
use of supports from the ground, installed every eight steps as a maximum and anyway where
the stair turns on the external side, conveniently fixed to the floor through plugs.
External overall dimension of the staircase may vary from mm 500 to mm 1000. Riser height
ranges from a minimum of mm 160 up to mm 250, tread width ranges from mm 200 to mm 250
(step mm 260 and mm 310). Staircase may have up to 16 steps, and a maximum height
between two floors of mm 4250.
For every layout of the stairs, the riser dimension remains unchanged along the whole flight.
Further complements of the stairs are different typologies of railings constituted by either steel
vertical posts or steel vertical posts coupled with bands of tubular bars parallel to the handrail
and equally distanced from each other along the whole post height. The handrail can be made
of solid beechwood or a steel tubular bar positioned at a height of 970 ÷ 1170 mm.
Geometry, dimensions and construction details are illustrated in Annexes 1 to 6 to this ETA.
1.1
Intended use
Stairs “L20” are intended for indoor use in buildings of category “A” EN 1990:2002 with air
temperatures between +5°C and +30°C and relative humidity between 30 % and 70 %.
The provisions made in this European Technical Approval are based on an assumed working
life of the stairs of at least 50 years, provided that the conditions laid down in sections 4.2, 5.1
and 5.2 for installation, packaging, transport and storage as well as for appropriate use,
maintenance and repair are met. The indications given on the working life cannot be interpreted
as a guarantee given by the producer, but are to be regarded only as a means for choosing the
appropriate products in relation to the expected economically reasonable working life of the
works.
2.
2.1
CHARACTERISTICS OF PRODUCT AND METHODS OF VERIFICATION
General
This ETA is issued for stair kit “L20” on the basis of admitted information/data, deposited with
ITC-CNR, which identify the kit that was assessed and judged. Changes to the production
process of the kit or to the components of the kit which could result in deposited
information/data being incorrect, shall be notified to ITC-CNR before they are introduced and
ITC-CNR will assess whether or not such changes affect the ETA and, if so, whether further
assessment and/or alteration to the ETA shall be necessary7.
The characteristics of the components and of the system not mentioned in this ETA nor in the
Annexes shall correspond to the respective values laid down in the Technical Documentation of
this ETA, checked by ITC-CNR.
7
The ETA Holder may change, under his own responsibility, some of the suppliers of a component, but only provided that the
characteristics and the performances of the new components and the final performances of the system do not change at all. These changes
must be fully recorded within the Factory Production Control documents in order to grant full traceability.
ETA 13/0868 L20
Page 3 of 16
2.2
Methods of verification
The identification tests and the assessment of fitness for the intended use of “L20” were carried
out in compliance with ETAG 008-01.
2.2.1
Essential Requirement 1: MECHANICAL RESISTANCE AND STABILITY
The staircase corresponds to the drawings and data contained in the annexes. The material
values, dimensions and tolerances of the components of the stair not indicated in the annexes
shall correspond to the values laid down in the Technical Documentation.
The staircase has a sufficient mechanical resistance and stability in order to resist to static or
quasi-static loads.
The characteristic values of resistance of the staircase given in Annex 7 were determined from
loading tests and by structural analysis.
Prevention of progressive collapse
Failure of individual components of the staircase does not lead to a progressive collapse of the
complete staircase.
Residual load-bearing capacity
The steps loaded by service loads stated in Annex 7 have a sufficient residual load-bearing
capacity. A local material failure does not lead to an abrupt total loss of load-bearing capacity of
the steps.
Long-term behavior
Under appropriate use and maintenance conditions, the characteristic values of resistance
stated in Annex 7 will be ensured over the entire indicated working life.
Resistance to earthquakes
The stair system has been verified by calculation with respect to permanent and variable
actions as described in the Calculation Report deposited with ITC CNR. The assessment has
been carried out in conformity with Ordinanza P.C.M. 20th March 2003 n. 3274 according to the
following parameters:
seismic zone 2 (according to EC8);
ground type “C”;
location factor S=1,150;
structural type: column and frame structure with structure factor 1;
ductility class: DCM
structural factor: one –storey building with one only bay.
SL
Pver
Tr
ag
Fo
T*c
Years
g
SLO
81.0
30.0
0.066
2.400
0.260
SLD
63.0
SLV
10.0
50.0
0.084
2.390
0.270
475.0
0.205
2.430
0.300
SLC
5.0
975.0
0.257
2.480
0.320
sec
ag: maximum horizontal ground acceleration;
Fo: maximum value of spectrum amplification factor during horizontal acceleration;
T*c: starting time of constant speed portion of horizontal acceleration spectrum;
Pver : probability of overcoming
Tr: return time
Tab.1: Resistance to earthquakes
Load-displacement behaviour and vibrations
The characteristic values concerning load-displacement ratio were determined by experimental
tests and by calculation and are reported in table 2.
ETA 13/0868 L20
Page 4 of 16
The vibration behaviour was determined by test. Under a single load of 1 kN acting on the most
unfavourable point the staircase shows a deflection of w ≤ 5 mm. The first natural frequency of
the staircase (inclusive of a single mass of 100 kg) is greater than 5 Hz.
Deflection and proper oscillation frequency under load of
Q = 1,00 kN
Type of stair
Deflection w [mm]
Frequency f [Hz]
4.02
5.83
“Dritta” R16
1.40
5.91
“L” P3-R13
0.61
6.99
“C” P3-R10-P3
0.65
11.74
“U” P3-P3-R10
1.60
9.52
“L” R6-P3-R7
0.64
9.05
“U” R10-P3-P3
1.30
5.81
“L” R13- P3
Table 2: deflection and proper oscillation frequency in the most unfavourable cases with 16 wooden steps
and outer width 1000mm, “Z” 8mm structural type
Resistance of the fixings
No Performance Determined (NPD).
The stairs are fixed by means of connectors which are covered by ETAs. The specifications of
such connectors are given in the manufacturer’s Technical Documentation.
2.2.2
Essential Requirement 2: SAFETY IN CASE OF FIRE
Reaction to fire
The reaction to fire of the steel components, in accordance with the provisions of EC decisions
(96/603/EC and 2000/605/EC), is classified A1 without the need for testing.
As for wooden steps, in accordance with the provisions of EC decision 2005/610/EC without the
need for testing: D – s2, d0.
Fire resistance
2.2.3 Essential Requirement 3: HYGIENE, HEALTH AND ENVIRONMENT
Dangerous substances
The manufacturer has presented a written declaration in which he states that stair kits do not
contain any of the dangerous substances listed in the EU database.
In addition to the specific clauses relating to dangerous substances contained in this European
Technical Approval, there may be other requirements applicable to the products falling within its
scope (e.g. transposed European legislation and national laws, regulations and administrative
provisions). In order to meet the provisions of the EU Construction Products Directive, these
requirements need also to be complied with, when and where they apply.
2.2.4 Essential Requirement 4: SAFETY IN USE
Geometry of the stair
The geometry of the stair is stated in Annexes 1 to 6. Within one flight, the tread width
measured on the walking line is constant.
Slipperiness
Equipment of the stair for a safe use
Barrier and handrail:
Note: Barrier and handrail must be attached to the stair (Annexes 1 to 6) with specific glass
fibre reinforced polyamide bushes.
ETA 13/0868 L20
Page 5 of 16
Tactility and visibility
Safe breakage of components
A brittle failure of individual components is excluded.
Impact resistance
On account of the materials used, brittle failure of individual components of the stair can be
excluded.
NPD option (No Performance Determined).
2.2.5 Essential Requirement 5: PROTECTION AGAINST NOISE
Not relevant.
2.2.6 Essential Requirement 6: ENERGY ECONOMY AND HEAT RETENTION
Not relevant.
2.2.7
ASPECTS OF DURABILITY AND SERVICEABILITY
Durability and serviceability
Resistance to deterioration caused by physical, chemical and biological agents.
Under appropriate use and maintenance conditions and at an indoor climate with air
temperatures between +5 °C and +30 °C and relative air humidity between 30 % and 70 % the
stair will have for the intended use an adequate resistance to:
physical agents such as the effects of temperature, solar radiation and variations of relative
humidity,
chemical agents such as the effects of cleaning agents, water, carbon dioxide, oxygen and
naturally occurring corrosives and pollution agents and
biological agents such as the effects of fungi, bacteria, algae and insects.
Finishes and surface layers
Steel components are corrosion protected with an epoxy powder coating surface treatment.
Stainless steel components are superficially finished with an abrasive treatment of satinizing or
polishing.
Wooden components (steps, structure and handrail) are coated with varnish and can be also
produced on request either unfinished or with various types of finishing (for example brushing).
3.
3.1
EVALUATION OF CONFORMITY AND CE MARKING
Attestation of conformity system
According to the Decision on the procedure of attestation of conformity 98/279/EC of 5
December 1997 as amended by Decision 2001/596/EC of the European Commission the
system 2+ of attestation of conformity applies.
In addition, according to Decision 2001/596/EC of the European Commission the System 4 of
attestation of conformity applies with regard to reaction to fire.
The system of Attestation of Conformity specified by the European Commission is System 2+
as described in the Council Directive 89/106/EEC Annex III, 2 (i), First possibility, as follows:
Declaration of Conformity of the product by the manufacturer on the basis of:
a) Tasks of the manufacturer:
1. Initial type testing of the product
2. Factory Production Control, including testing of samples taken at the factory in accordance
with a control plan8.
8
The control plan has been deposited with ITC-CNR and is only made available to the Notified Bodies involved in the conformity attestation
procedure.
ETA 13/0868 L20
Page 6 of 16
b) Tasks of the Notified Body:
3. Certification of Factory Production Control on the basis of:
Initial inspection of the factory and of factory production control;
Continuous surveillance, assessment and approval of Factory Production Control.
3.2
Responsibilities
3.2.1 Tasks of the manufacturer
3.2.1.1 Initial Type testing (system 2+)
For Initial Type Testing, the results of the test performed as part of the assessment for this
European Technical Approval shall be used unless there are changes in the production line or
plant. In such cases, the necessary new initial type testing has to be agreed between ITC-CNR
and the Manufacturer. These tests could be taken over by the Manufacturer for Declaration of
Conformity.
3.2.1.2 Factory production control
The ETA Holder has a Factory Production Control system in his plants (manufacturing of the
stair kits) and exercises permanent internal control of production, including testing samples in
accordance with his control plan.
For the components of “L20” which the ETA Holder does not manufacture by himself, he makes
sure that an appropriate Factory Production Control carried out by other manufacturers
guarantees the compliance of such components with the European Technical Approval. To this
end:
- he relies on national certification bodies,
- has specified through contracts with his suppliers the awaited characteristics, the controls and
frequencies, and
- he carries out controls on such components by himself.
The control plan and the provisions taken by the ETA Holder for components not produced by
himself have been agreed with the Approval Body and deposited with ITC-CNR where it is only
made available to the Notified Body involved in the Conformity attestation procedure. Such
control plan will be given to the Notified Body chosen by the ETA Holder to perform the duties
laid down in the attestation of conformity.
The manufacturer only uses raw materials supplied with the relevant inspection documents as
laid down in the control plan. The incoming raw materials are subject to verifications by the
manufacturer before acceptance.
All the elements, requirements and provisions adopted by the manufacturer are documented in
a systematic manner in the form of written processes and procedures. This production control
system ensures that “L20” kits and their components are in conformity with this European
Technical Approval.
The results of Factory Production Control are recorded and evaluated. The records include,
among the others, the following information:
- designation of the product, raw materials and components;
- type of control or testing;
- date of the product’s manufacture and date of testing of the product or raw materials
and components;
- results of controls and testing and, if appropriate, comparison with requirements;
- signature of the person responsible for Factory Production Control.
The records shall be presented to the inspection body during the continuous surveillance. They
shall be presented to ITC-CNR on request.
Details of the extent, nature and frequency of testing and controls to be performed within the
Factory Production Control shall correspond to the control plan which is part of the technical
documentation of this European Technical Approval.
ETA 13/0868 L20
Page 7 of 16
3.2.2. Tasks of the Notified Bodies
3.2.2.1 Initial inspection of factory and Factory Production Control
The Notified Body shall ascertain that, in accordance with the control plan, the factory, in
particular the staff and equipment, and the Factory Production Control are suitable to ensure a
continuous and orderly manufacturing of the components according to the specifications given
in clause 2 of this ETA.
3.2.2.2 Continuous surveillance, assessment and approval of factory production control
The Notified Body shall visit the factory at least once a year for surveillance purposes. It shall
be verified that the system of Factory Production Control and the specified manufacturing
process are maintained taking into account the deposited control plan. Continuous surveillance
and assessment of Factory Production Control have to be performed in accordance with the
control plan.
During each visit, the Notified Body shall use an ad-hoc checklist and shall examine, among the
others:
- the control registers of raw materials, products in course of manufacture and finished
products,
- the documents attesting the application of the control frequencies,
- the conformity of the products subjected to this ETA.
In cases where the provisions of the European Technical Approval and the control plan are no
longer fulfilled, the conformity certificate shall be withdrawn.
3.3.
4.
4.1
CE Marking
The CE Marking shall be affixed on the packaging or on accompanying commercial documents
(DDT). The symbol «CE» shall be accompanied by the following information:
- identification number of the Notified Body,
- name or identifying mark of the ETA Holder and name of his manufacturing plant,
- legal address of the ETA Holder,
- the last two digits of the year in which the CE marking was affixed,
- number of the EC Certificate of conformity,
- number of this European Technical Approval,
- name of the stair version “L20”;
ETAG 008-01, edition January 2002.
ASSUMPTIONS UNDER WHICH THE FITNESS OF THE PRODUCT FOR THE INTENDED
USE WAS FAVOURABLY ASSESSED
Manufacturing
Stairs “L20” shall correspond, as far as their composition and manufacturing process are
concerned, to the products subjected to the approval tests. The manufacturing process scheme
is deposited with ITC-CNR.
4.2
Installation
4.2.1. General
It is the responsibility of the ETA Holder to make sure that all persons concerned are
appropriately informed about the specific design and installation conditions of the stair kit “L20”.
Such information can be given using reproductions of the respective parts of this European
Technical Approval. Furthermore, all the data concerning the execution shall be clearly
indicated on the packaging and/or on the enclosed instruction sheets using one or several
illustrations. In any case, it is appropriate to comply with national regulations and particularly
fire regulations.
5
5.1
RECOMMENDATIONS
Packaging, transport and storage
The stair kits are placed into wood packaging boxes on which specific identification labels are
affixed.
ETA 13/0868 L20
Page 8 of 16
The manufacturer takes measures to avoid damage during storage and transport, for instance
by sticking warning signs such a “do not expose to water” or “handle with care” on the
packaging boxes.
5.2
Maintenance and repair of the stair
The first maintenance service is carried out after twelve months and consists in evaluating the
fastening state of all the connecting screws of the different components. The stairs can be
cleaned with a water-moist cloth or, if required, with a non-aggressive detergent. All cleaning
tools that may cause wear on the surface of the components of the stair and all products
containing abrasive agents and chemical solvents of any kind whatsoever, shall be avoided in
any case.
Any localised damage due to accidental actions shall be timely repaired.
The original version is signed by
Dr. Roberto Vinci
(ITC Director)
ETA 13/0868 L20
Page 9 of 16
Annex 1 of European Technical Approval 13/0868: “Flight stair kit with double lateral load bearing string”
F lateral supports – S supports from the ground (alternatively, if a load bearing wall is absent)
“L20”
Stair type and geometries
ETA 13/0868 L20
Annex 1
of European Technical Approval 13/0868:
Flight stair kit with double lateral load bearing string
Page 10 of 16
L20-2RI-GLE
Parameters
Symbol
Value (mm)
Step width
Lg
500 -1000
Tread
P
200 - 250
Riser
A
160- 250
Step thickness
sg
40 - 60
Overlapping
S
60
Structure height
hs
230 - 300
Structure thickness
st
8 -10
“L20”
Global view and technical and structural details
ETA 13/0868 L20
L20-2RZ-GLA
Annex 2
Page 11 of 16
FIXING TO THE BOTTOM FLOOR
FIXING AT THE LANDING
FIXING OF THE STEP– STRUCTURE
WOODEN STEP
STEEL STEP
STRUCTURAL PARTS JOINTING
“L20”
Connection with the floor, landing and structural
parts jointing, details
ETA 13/0868 L20
Annex 3
Page 12 of 16
FIXING ON SIDE OF THE STAIRCASE
“L20”
Fixing on side and by means of supports from
the ground, details
ETA 13/0868 L20
FIXING WITH SUPPORTS FROM THE GROUND
Annex 4
Page 13 of 16
Post with 2 flat bars 40x6 mm
and 6 round bars Ø 12 mm
Balusters Ø 20 mm
R1
R5
R1, R2, R4, R5, R6 railings, details
ETA 13/0868 L20
R4
R2
Post with 2 profiles 15x15 mm
“L20”
Post with 1 flat bar 40x8 mm
Post with 1 tubular bar Ø 42
R6
Annex 5
Page 14 of 16
Value
Parameter
(mm)
Up to 4250
Height between floors
Riser
From 160 to 250
260 and 310
Length of the step
From 200 to 250
Tread width
Width of the step
From 500 to 1000
Thickness of the wooden step/3 mm steel box-shaped step
40 - 60
Length of the median line of the flight of stairs
5330 (1)
From 970 to 1170
Height of the handrail
38 - 50
Outer diameter of the handrail
Distance between the railing balusters
From 80 to 90
(1) with 16 average height risers and maximum tread
Components
Materials
Supporting structures for steps, steps,
brackets and posts
Steel
Type
Mechanical
characteristics
S235 JR EN 10025
ftk = 360 N/mm²
S275 JR EN 10025
ftk = 430 N/mm²
ft.k = 800 N/mm²
Steel
Nuts and bolts
8.8 class
fv,k = 640 N/mm²
fd,N = 560 N/mm²
fd,V = 396 N/mm²
Steps and handrail
Finger Joint
beech
BS 11 – GL 24
(DIN 1052 EN 385)
Accessories
Polyamide
PAV 6 30% glass fibre
“L20”
Geometry and materials of the stairs
ETA 13/0868 L20
fmk = 11 N/mm²
fvk = 8.5 N/mm²
fck = 8.5 N/mm²
ftk = 66 N/mm²
fyk = 38 N/mm²
Annex 6
Page 15 of 16
Load-bearing capacity at ultimate limit state - Characteristic values of resistance Rk
Stair component
Steps
Steps
Handrail
Characteristic values
of resistance
Type of load
Vertical variable evenly
distributed load
qRk =
Vertical variable single point
load
QRk =
Horizontal variable evenly
distributed load
hRk =
3.0
Coefficients
[kN/m²]
γs = 1.1
γw = 1.5
3.0
[kN]
γp = 2.0
γQ = 1.5
NPD
Proof of ultimate limit state is only given if the design value of the loads (Fd) does not exceed the design value of the resistance (Rd): Fd ≤ Rd
with Fd = Fk ⋅ γQ and Rd = Rk / γs
γw = partial safety factor of wood
γp = partial safety factor of polymers
γs = partial safety factor of steel
γQ = partial safety factor taking account of the model's uncertainties and dimensional variations (Appendix A of standard CEN/TS 15680:2007)
Fk = Load characteristic values in accordance with Eurocode EN 1991-1-1:2002 for Category A residential buildings
Load-bearing capacity at serviceability limit state - Deflections under loading
Deflection of the steps under evenly distributed load
Load Fs
qs =
2.00
[kN/m²]
Clear length of the stair
l=
Length
[mm]
Deflection under load Fs related to the clear width of the stair
w≤
l/200
[-]
Qs =
2.00
[kN]
Deflection of the step under single point load
Load Fs
Clear width of the stair
l=
Width
[mm]
Deflection under load Fs related to the clear width of the stair
w≤
l/200
[-]
Proof of serviceability limit state is only given if the characteristic values of the loads (Fk) do not exceed the values (Fs): Fk ≤ Fs
Load-bearing capacity – Admissible loads
Minimum value from proof of ultimate limit state and serviceability limit state
Vertical variable evenly distributed load
q=
2.00
[kN/m²]
Vertical variable single point load
Q=
2.00
[kN]
Horizontal variable evenly distributed load
hs =
NPD
Admissible loads = min [Rk / (γs ⋅ γQ) , Fs]
“L20”
Load-bearing capacity
ETA 13/0868 L20
Annex 7
Page 16 of 16

ETA L20 ENG - Aedilitia - Consiglio Nazionale delle Ricerche

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