SIST EN 13747:2005+A2:2010

Precast concrete products - Floor plates for floor systems

This European standard deals with the requirements, the basic performance criteria and evaluation of conformity for precast floor plates made of reinforced or prestressed normal weight concrete according to EN 1992-1-1:2004, used in conjunction with cast-in-situ concrete (topping) for the construction of composite floor slabs. Annex B gives different types of composite slabs made with floor plates.
These floor plates, with or without void formers, can include lattice girders or stiffening ribs incorporated during the precasting.
They shall be manufactured in factories by casting, slip forming or extrusion.
If major part of mechanical resistance is taken up by the precast stiffening ribs, the product belongs to EN 1168 or to EN 13224, according to the section.
The products covered by this standard are intended to be used as part of structural floors in applications such as:
-   floors and roofs of buildings (including industrial and storage buildings, public buildings as schools, hospitals, etc.);
-   parking/circulation areas;
-   cover for culverts;
-   etc.
Floor plates for bridge decks belong to the scope of EN 15050 and are not covered by this European Standard.
The products may be used in seismic areas provided they fulfil the requirements specific to this use.
This standard does not cover:
-   reinforced and prestressed floor plates with a nominal thickness less than 40 mm;
-   prestressed floor plates with a nominal thickness less than 50 mm without stiffening ribs or lattice girder;
-   floor plates with a very smooth upper face, such as defined in 6.2.5 of EN 1992-1-1:2004.

Betonfertigteile - Deckenplatten mit Ortbetonergänzung

Diese Europäische Norm legt die Anforderungen an Fertigteilplatten aus Stahl- oder Spannbeton nach EN 1992 1 1:2004, die in Verbindung mit Ortbeton (Aufbeton) zur Herstellung von Fertigplatten mit Ortbetonergänzung verwendet werden, sowie die für sie geltenden grundlegenden Leistungskriterien und die Bewertung ihrer Konformität fest. In Anhang B sind die unterschiedlichen Typen von Fertigplatten mit Ortbetonergänzung angegeben, die unter Verwendung von Fertigteilplatten hergestellt werden.
Diese Fertigteilplatten können unabhängig davon, ob sie mit oder ohne Verdrängungskörper eingebaut werden, Gitterträger oder Versteifungsrippen enthalten, die bei der Vorfertigung eingebracht werden.
Sie müssen in Werken entweder in Schalungen betoniert oder in Gleitfertigern oder durch Strangpressen hergestellt werden.
#Wird die Widerstandsfähigkeit gegen mechanische Einwirkungen vorwiegend durch die vorgefertigten Versteifungsrippen sichergestellt, gelten für das Produkt die maßgebenden Abschnitte entweder aus EN 1168 oder aus EN 13224.$
Die in dieser Norm behandelten Produkte sind für den Einsatz als Teil von tragenden Decken z. B. in folgenden Anwendungen vorgesehen:
   Geschossdecken von Gebäuden (einschließlich Industrie- und Lagergebäude, öffentliche Gebäude wie z. B. Schulen, Krankenhäuser usw.);
   Parkflächen und Verkehrsflächen;
   Abdeckung von Gräben;
   usw.
#Deckenplatten für Brückenüberbauten werden vom Anwendungsbereich von EN 15050 abgedeckt und sind nicht Gegenstand dieser Europäischen Norm.$
Diese Produkte dürfen in Erdbebengebieten eingesetzt werden, sofern sie die für diesen Fall geltenden besonderen Anforderungen erfüllen.
Die Norm gilt nicht für:
   !Fertigteilplatten aus Stahlbeton oder aus Spannbeton" mit einer Nenndicke kleiner als 40 mm;
   Spannbeton-Fertigteilplatten mit einer Nenndicke kleiner als 50 mm !ohne Versteifungsrippen oder Gitterträger";
   Fertigteilplatten mit sehr glatter Oberfläche, die in EN 1992 1 1:2004, 6.2.5 festgelegt sind.

Produits préfabriqués en béton - Prédalles pour systèmes de planchers

La présente Norme européenne spécifie les prescriptions, les critères relatifs aux performances de base et d’évaluation de la conformité pour les prédalles préfabriquées en béton armé ou précontraint de granulats courants conformément à l’EN 1992-1-1:2004, utilisées conjointement avec du béton coulé en place (dalle rapportée) pour la construction de dalles de planchers composites. L’Annexe B donne différents types de dalles composites fabriquées avec des prédalles.
Ces prédalles, avec ou sans blocs d’élégissement, peuvent comprendre des raidisseurs à treillis ou des nervures de raidissement incorporés pendant la préfabrication.
Elles doivent être fabriquées en usine par moulage, par filage ou par extrusion.
#Si la plus grande partie de la résistance mécanique est reprise par les nervures de raidissement préfabriquées, le produit relève de l’EN 1168 ou de l’EN 13224, selon sa section.$
Les produits visés par la présente norme sont destinés à faire partie de planchers structurels pour des applications telles que :
—   planchers et toitures de bâtiments (y compris des bâtiments industriels et de stockage, des bâtiments publics comme les écoles, des hôpitaux, etc.) ;
—   zones de stationnement/circulation ;
—   couvercles pour cadres enterrés ;
—   etc.
#Les prédalles pour les tabliers de pont relèvent du domaine d’application de l’EN 15050 et ne sont pas traitées dans la présente Norme européenne.$
Les produits peuvent être utilisés en zones sismiques à condition qu’ils répondent aux prescriptions spécifiques à cette utilisation.
La présente norme ne vise pas :
—   les prédalles en béton armé !et les prédalles précontraintes" avec une épaisseur nominale inférieure à 40 mm ;
—   les prédalles précontraintes avec une épaisseur nominale inférieure à 50 mm !sans nervure de raidissement, ni raidisseur à treillis" ;
—   les prédalles avec une face supérieure très lisse, tel que défini au paragraphe 6.2.5 de l'EN 1992 1 1:2004.

Montažni betonski izdelki - Etažne plošče za etažne sisteme

Ta evropski standard obravnava zahteve, osnovna merila za zmogljivost in ocenjevanje skladnosti montažnih etažnih plošč, narejenih iz armiranega betona ali prednapetega betona običajne teže v skladu s to EN 1992-1-1:2004, ki se uporablja v povezavi z in-situ odlitim betonom (polnjenje) za izgradnjo tankih kompozitnih etažnih plošč. Dodatek B podaja različne vrste tankih kompozitnih plošč, narejenih iz etažnih plošč. Te etažne plošče z ali brez praznih kalupov lahko vsebujejo rešetkarske nosilce ali ojačana rebra, ki se vključijo pri vgrajevanju betona. Proizvajati bi se morale v tovarnah z vgrajevanjem, pri pripravi drsnega opaža ali z ekstrudiranjem. Če glavni del mehanske odpornosti prevzamejo vgrajena ojačana rebra, proizvod sodi v EN 1168 ali EN 13224, v skladu z razdelkom. Proizvodi, ki jih zajema ta standard, se uporabljajo kot del strukturnih tal pri uporabah, kot so: tla in strehe stavb (vključno z industrijskimi in skladiščnimi poslopji, javnimi poslopji kot so šole, bolnice, itd.); parkirnimi in prometnimi površinami; zaščito prepustov itd. Etažne plošče za premostitvene objekte spadajo v področje uporabe EN 15050 in niso zajete v tem evropskem standardu. Proizvodi se lahko uporabljajo na potresnih območjih pod pogojem, da izpolnjujejo zahteve, ki veljajo za takšno uporabo. Ta standard ne zajema: armiranih in prednapetih betonskih etažnih plošč z nominalno debelino, manjšo od 40 mm; prednapetih betonskih etažnih plošč z nominalno debelino, manjšo od 50 mm brez ojačanih reber ali rešetkastih nosilcev; etažnih plošč z zelo gladko zgornjo stranjo, kot so opredeljene v točki 6.2.5 EN 1992-1-1:2004.

General Information

• Status: Published
• Publication Date: 17-Aug-2010
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: BBB - Concrete, reinforced concrete and prestressed concrete
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2010
• Due Date: 06-Jun-2010
• Completion Date: 18-Aug-2010
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/100 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on precast concrete products
• Ref Project: EN 13747:2005+A2:2010 - Precast concrete products - Floor plates for floor systems

Relations

• Consolidates: SIST EN 13747:2005+A1:2009 - Precast concrete products - Floor plates for floor systems
• Effective Date: 01-Sep-2010

Overview

SIST EN 13747:2005+A2:2010 (EN 13747) is the European standard for precast concrete floor plates used together with cast‑in‑situ concrete topping to form composite floor slabs. It sets out requirements, basic performance criteria and conformity assessment for factory‑made floor plates manufactured by casting, slip‑forming or extrusion. The standard covers both reinforced and prestressed normal‑weight concrete plates, with or without void formers, and may incorporate lattice girders or stiffening ribs.

Key exclusions: floor plates for bridge decks (covered by EN 15050), very thin plates (nominal thickness < 40 mm for reinforced/prestressed; < 50 mm for prestressed without ribs), and plates with very smooth upper faces as defined in EN 1992-1-1.

Key technical topics and requirements

• Material and production requirements
  • Constituent materials for concrete, reinforcement and prestressing steel, inserts and connectors.
  • Factory production control (FPC) and concrete production/hardening requirements.
• Finished product requirements
  • Geometrical properties, surface characteristics, mechanical resistance, durability, fire, acoustic and thermal properties.
  • Positioning of reinforcement, straightness, flatness and weight measurement.
• Design and detailing
  • Guidance for monolithism of composite slabs, anchorage, support joints and connections between plates (informative annexes).
  • Serviceability and ultimate limit state considerations for composite slabs made with precast plates.
• Special features
  • Use of void formers and stiffening ribs (dimensions and spacing covered in annexes).
  • Rules when precast ribs take most mechanical action (such products may fall under EN 1168 or EN 13224).
• Testing & conformity
  • Type testing (including erection span tests), tests on concrete and prestressing, inspection schemes and conformity procedures.
  • CE marking and requirements addressing the EU Construction Products Directive (Annex ZA).

Practical applications and users

• Typical applications: floors and roofs of buildings (industrial, public, residential), parking/circulation decks, culvert covers and other structural floors.
• Users who rely on EN 13747:
  • Precast manufacturers seeking compliance and CE marking
  • Structural and civil engineers designing composite slabs
  • Architects and specifiers writing performance-based requirements
  • Contractors and quality inspectors performing factory production control and on-site acceptance
• The standard applies in seismic areas provided specific seismic requirements are also met.

Related standards

• EN 1992‑1‑1 (Design of concrete structures) - referenced for concrete design rules
• EN 1168 / EN 13224 - for products where stiffening ribs provide the main load resistance
• EN 15050 - covers precast elements for bridge decks (not covered by EN 13747)

Keywords: precast concrete, floor plates, composite slabs, EN 13747, topping, prestressed, reinforced, void formers, stiffening ribs, factory production control, CE marking.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Betonfertigteile - Deckenplatten mit OrtbetonergänzungProduits préfabriqués en béton - Prédalles pour systèmes de planchersPrecast concrete products - Floor plates for floor systems91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:Ta slovenski standard je istoveten z:EN 13747:2005+A2:2010SIST EN 13747:2005+A2:2010en,fr,de01-september-2010SIST EN 13747:2005+A2:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13747:2005+A2
March 2010 ICS 91.100.30 Supersedes EN 13747:2005+A1:2008English Version
Precast concrete products - Floor plates for floor systems
Produits préfabriqués en béton - Prédalles pour systèmes de planchers
Betonfertigteile - Deckenplatten mit Ortbetonergänzung This European Standard was approved by CEN on 17 February 2005 and includes Corrigendum 1 issued by CEN on 6 December 2006, Amendment 1 approved by CEN on 14 September 2008 and Amendment 2 approved by CEN on 14 February 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13747:2005+A2:2010: ESIST EN 13747:2005+A2:2010

Inspection schemes . 30A.1 Process inspection . 30A.2 Finished product inspection . 31Annex B (informative)
Types of composite slabs . 32B.1 Scope . 32B.2 Different types of composite slabs . 32B.2.1 Solid composite slabs. 32B.2.2 Hollow composite slabs. 32B.3 Topping . 33Annex C (informative)
Stiffening ribs and void formers . 34C.1 Stiffening ribs . 34C.1.1 Nominal width of ribs . 34C.1.2 Nominal height of ribs. 34C.1.3 Nominal space between ribs . 34C.1.4 Distance between the edge of the floor plate and the centre line of the nearest rib . 35C.1.5 Specific case of reinforced floor plate with a single rib . 35C.2 Void formers . 36C.3 Additional examples of stiffening ribs and ball void formers . 37C.3.1 General . 37C.3.2 Dimensions . 38Annex D (informative)
Monolithism of composite slabs . 40D.1 General . 40D.2 Strength of connecting reinforcement . 41D.3 Anchorage of connecting reinforcement . 41Annex E (informative)
Detailing of support joints and anchorage of reinforcement of composite slabs. 44E.1 Scope . 44E.2 General . 44E.2.1 Effective support length . 44E.2.2 Types of connections. 45E.3 Anchorage of lower reinforcements of the composite slab. 47E.3.1 Anchorage on the end support . 47E.3.2 Anchorage in special cases . 49Annex F (informative)
Design of composite slab . 53F.1 General . 53F.2 Connections between adjacent floor plates . 53F.3 Bending ultimate limit state . 55F.4 Serviceability limit state . 55F.4.1 General . 55F.4.2 Serviceability limit state design of composite slab made of reinforced floor plate . 56F.4.3 Serviceability limit states design of composite slabs made of prestressed floor plates . 59F.5 Transverse bending design of composite slab . 59Annex G (informative)
Concrete strength at time of prestressing . 61G.1 General . 61G.1.1 Procedure . 61G.1.2 Interpretation of results . 61Annex H (informative)
Composite slabs with void formers . 63H.1 General . 63H.2 Material properties . 63H.2.1 Polystyrene/Air voids . 63H.2.2 Clay . 63H.3 Temperature profiles . 64H.4 Other items to be considered . 64Annex J (normative)
Testing to determine erection spans (type testing) . 65SIST EN 13747:2005+A2:2010

Anchorage capacity of loops . 71Annex ZA (informative)
!Clauses of this European Standard addressing the provisions of the EU Construction Products Directive. 74ZA.1 Scope and relevant characteristics . 74ZA.2 Procedure for attestation of conformity of floor plates for floor systems. 76ZA.2.1 System of attestation of conformity . 76ZA.2.2 EC Certificate and Declaration of conformity . 77ZA.3 CE marking and labelling . 78ZA.3.1 General . 78ZA.3.2 Declaration of geometrical data and material properties (method 1) . 80ZA.3.3 Declaration of product properties (method 2) . 82ZA.3.4 Declaration of compliance with a given design specification provided by the client (method 3a) . 84ZA.3.5 Declaration of compliance with a given design specification provided by the manufacturer according to the client's order (method 3b) . 85 SIST EN 13747:2005+A2:2010

and # $. The modifications of the related CEN Corrigendum have been implemented at the appropriate places in the text and are indicated by the tags ˜ ™. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 89/106/EEC. For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This standard is one of a series of product standards for precast concrete products. For common aspects reference is made to EN 13369: Common rules for precast products, from which also the relevant requirements of the EN 206-1: Concrete — Part 1: Specification, performances, production and conformity are taken. The references to EN 13369 by CEN/TC 229 product standards are intended to make them homogeneous and to avoid repetitions of similar requirements. Eurocodes are taken as a common reference for design aspects. The installation of some structural precast concrete products is dealt with by ENV 13670-1: Execution of concrete structures — Part 1: Common rules, which has at the moment the status of a European prestandard. In all countries it can be accompanied by alternatives for national application and it shall not be treated as a European standard. The programme of standards for structural precast concrete products comprises the following standards, in some cases consisting on several parts:  EN 1168, Precast concrete products — Hollow core slabs  EN 12794, Precast concrete products — Foundation piles  EN 12843, Precast concrete products — Masts and poles  EN 13747, Precast concrete products — Floor plates for floor systems SIST EN 13747:2005+A2:2010

EN 1168 or to EN 13224, according to the section.$ The products covered by this standard are intended to be used as part of structural floors in applications such as:  floors and roofs of buildings (including industrial and storage buildings, public buildings as schools, hospitals, etc.);  parking/circulation areas;  cover for culverts;  etc. #Floor plates for bridge decks belong to the scope of EN 15050 and are not covered by this European Standard.$ The products may be used in seismic areas provided they fulfil the requirements specific to this use. This standard does not cover:  reinforced !and prestressed" floor plates with a nominal thickness less than 40 mm;  prestressed floor plates with a nominal thickness less than 50 mm !without stiffening ribs or lattice girder";  floor plates with a very smooth upper face, such as defined in 6.2.5 of EN 1992-1-1:2004. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13369:2004, Common rules for precast concrete products ˜EN 10080:2005™, Steel for the reinforcement of concrete — Weldable reinforcing steel — General EN 12390-4, Testing hardened concrete — Part 4: Compressive strength — Specification for testing machines EN 12390-6, Testing hardened concrete — Part 6: Tensile splitting strength of test specimens SIST EN 13747:2005+A2:2010

the main reinforcement of the composite slab 3.1.3 prestressed floor plate floor plate in which the prestressing steel constitutes all or part of the main reinforcement of the composite slab 3.1.4 floor plate with lattice girders floor plate in which continuous lattice girders are incorporated generally in the longitudinal direction (i.e. parallel to the span) to provide strength and rigidity for transient situations 3.1.5 floor plate with ribs floor plate in which continuous stiffening ribs are positioned generally in the longitudinal direction (i.e. parallel to the span) to provide strength and rigidity for transient situations 3.2 lattice girders two dimensional or three dimensional metallic structure comprising an upper chord, one or more lower chords and continuous or discontinuous diagonals which are welded or mechanically connected to the chords Figure 1 gives some examples of lattice girders.
a) continuous diagonals SIST EN 13747:2005+A2:2010

b) continuous diagonals with steel profile unfilled with concrete
c) discontinuous diagonals Figure 1 — Examples of lattice girders 3.3 stiffening rib continuous concrete profile formed on the upper surface of the floor plate during the precasting operation. It extends generally in the main direction of the floor plate. Figure 2 gives examples of different stiffening rib configurations
a)
rectangular ribs b)
T-section ribs Figure 2 — Examples of stiffening ribs 3.4 Dimensions 3.4.1 length, L dimension of the product in the main mechanical direction (i.e. supporting the most important bending moment) #, protruding reinforcement, if any, not included$ 3.4.2 width, b dimension perpendicular to the length 3.4.3 thickness, hp nominal distance between the upper and the lower faces of the floor plate. Where the upper surface is uneven (see Figure 3) the distance should be measured to the mean plane of the surface SIST EN 13747:2005+A2:2010

Figure 3 — Thickness hp of a floor plate 3.4.4 edge side of the floor plate. A distinction is made between:  supported edge: edge intended for connection to the support elements of the structure;  lateral edge: edge between contiguous floor plates;  free edge: edge left free after construction of the floor 3.4.5 upper face face of the floor plate when in its final position of use. It forms the interface with cast-in-situ topping above the floor plate 3.4.6 lower face visible face of the precast element in opposition to the upper face 3.5 Reinforcements 3.5.1 connecting reinforcement reinforcement anchored on both sides of the interface between the floor plate and the cast-in-situ concrete. It consists of the diagonals of the lattice girder, individual or continuous reinforcement in the form of loops, possibly with a longitudinal bar welded at the top and/or bottom (see Figure 4).
a) lattice girder b) loops Figure 4 — Examples of connecting reinforcement SIST EN 13747:2005+A2:2010

a) lattice girder b) loops Figure 5 — Examples of shear reinforcements 3.6 Void formers 3.6.1 void former element glued, connected or otherwise incorporated into the floor plate during or after precasting (see Figure 6), but before delivery. These elements are generally intended to decrease the weight of the floor
a) glued or connected b) incorporated Figure 6 — Void formers 3.6.2 non-structural void former void former that does not contribute to the mechanical strength of the composite slab 3.6.3 structural void former void former that, together with the cast-in-situ concrete, contributes to the mechanical strength of the composite slab 3.7 cast in unit unit incorporated into the floor plate during precasting, e.g. lifting inserts, junction or switch boxes, conduits, ducts, etc. SIST EN 13747:2005+A2:2010

#Spalling stress in the ribs without shear reinforcement shall be evaluated and shall not exceed the tensile strength of concrete at prestress release.$ 4.2.3.2.2 Accuracy of tensioning Clause 4.2.3.2.2 of EN 13369:2004 shall apply. 4.2.3.2.3 Minimum concrete strength at transfer At the time of transfer of prestressing, the minimum compressive strength, fcmin,p, measured on cylinder specimens shall be at least (5/3) σcp where σcp is the compressive stress developed in the bottom fibre of the floor plate under the final prestressing force, or 20 MPa, whichever is the greater. SIST EN 13747:2005+A2:2010

Unless it can be justified otherwise, the nominal clear distance between bars constituting the main #and transverse$ reinforcement shall be at least equal to those as shown in Figure 7. Dimensions in millimetres
Key dg = maximum aggregate size Ø = diameter of the bar NOTE For definition of ∅n see 8.9.1 of EN 1992-1-1:2004. ####Figure 7 —Minimum distances$$$$
a) loops without longitudinal bar b) loops with longitudinal bar
c) lattice girder with welded longitudinal bar™ Figure 8 — Protruding connecting reinforcement 4.2.4.1.2 Positioning of connecting reinforcement in the floor plate When the connecting reinforcement is made of continuous loops, the nominal distance between two adjacent reinforcement lines shall be no greater than 4 ht or 835 mm whichever is the lesser (see Figure 9). The distance between vertical legs of a same loop or of two adjacent loops shall be as follows:  between the centre axes of two adjacent loops ≤ 300 mm;  between the adjacent legs of two loops ≥ 30 mm. SIST EN 13747:2005+A2:2010

Key 1 shear force direction Figure 9 — Spacing of connecting reinforcement 4.2.4.1.3 Connection with the supporting structure Some typical construction details are indicated in Annex E. 4.2.4.1.4 Connection between adjacent floor plates Connection details shall be given in project specifications. Examples of reinforcement details between adjacent floor plates are shown in Annex F. 4.2.4.2 Particular requirements for positioning of lattice girders The positioning of lattice girders shall comply with the following requirements: 4.2.4.2.1 Distance between lattice girders The nominal distance between axis of lattice girders shall be such that (see Figure 10): a ≤ [835 or (15 hp + 125)] mm whichever is the lesser SIST EN 13747:2005+A2:2010

Figure 10 — Distance between axis of lattice girders 4.2.4.2.2 Distance between the outer lattice girder and the nearest edge of the floor plate The nominal distance between the centreline of the edge lattice girder and the nearest edge of the floor plate shall be such that (see Figure 11): a2 ≤ 0,5 [835 or (15 hp + 125)] mm whichever is the lesser
Figure 11 — Distance between the axis of the outer lattice girder and the nearest edge 4.2.4.2.3 Specific case of reinforced floor plate with a single lattice girder The nominal width of a reinforced floor plate with a single lattice girder shall be such that (see Figure 12): b ≤ 0,75 (15 hp + 125) mm or b ≤ 630 mm whichever is the lesser
Figure 12 — Case of a floor plate with a single lattice girder SIST EN 13747:2005+A2:2010

Figure 13 — Minimum embedment of lower chord of the lattice girder into the floor plate 4.2.4.2.5 Longitudinal positioning of lattice girder The nominal distance, lg, from the lower joint of the first diagonal to the nearest edge of the floor plate shall not be greater than 250 mm if this element should be a reinforced plate with lattice girder (see Figure 14). NOTE Short lattice girders which do not fit this requirement should be added (e.g. as bond reinforcement). Dimensions in millimetres
Figure 14 — Longitudinal positioning of lattice girders 4.2.4.3 Particular requirements for positioning of prestressing tendons 4.2.4.3.1 Positioning of prestressing tendons in the floor plates without ribs The pretensioned tendons shall be located on one or more layers according to the thickness of the floor plate. When the floor plate thickness is less than 60 mm the prestressing tendons should be located on one layer, situated close to the middle plane of the floor plate in order to avoid tensile stress in the concrete. SIST EN 13747:2005+A2:2010

or ∅, whichever is the largest;  vertically: dg, 10 mm
or ∅ whichever is the largest. e) the nominal distance le, between the outer tendon edge and the nearest longitudinal edge of the floor plate shall be not lesser than 3 ∅ and not greater than 150 mm.
Figure 15 — Positioning of prestressing tendons in floor plate without ribs 4.2.4.3.2 Positioning of prestressing tendons in ribs When prestressing tendons are located in ribs and in the absence of specific justifications, the nomin
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