fib com6 prefabrication com6 background

Activity report & overview[Stef MAAS]

fib COM6 prefabrication

COM6 Background

Prefabrication plays an important role in structural concrete construction worldwideand is evolving continuously, to cope with current society’s habits and needs related to housing, commercial buildings and civil engineering works.

Industrialized construction brings cost efficiency, good quality and environmentally friendly solutions, able to adapt to market demands.

COM6 Goal

The basic goal of the Commission Prefabrication is to enhance the progress of precast concrete, linked to the state of art.

The general scope is to promote the understanding, not only by the specialists, ofdesign concepts, technology and use of precast concrete.

COM6 at a glance

Approximately 55 delegates Balanced composition (academics, designers, producers,

suppliers, contractors)

Representing 20 countriesAustralia (2), Belgium (3), Bosnia & Herzegovina (1), Brazil (3), Canada (1), China (1), Czech Republic (1), Finland (3), France (4), Germany (3), Greece (1), India (2), Ireland (1), Italy (4), New Zealand (1), Norway (1), Poland (2), Portugal (2), Russia (1), Spain (3), Sweden (2), Turkey (1), The Netherlands (3), United Kingdom (1), USA (6)

Organisation Chairman (tbc): Stef MAAS (BE)

Vice-chair (tbc): Wit DERKOWSKI (SP)

Secretariat Alessandra RONCHETTI (IT)

COM6 Belgian delegates

Arnold VAN ACKER

Past chairman C6Convenor TG 6.9

(Accidental loading)

Convenor TG 6.12 (Precast Handbook)

Member of several TG’s

Pieter VAN DER ZEE

Ergon Member of several TG’s

Stef MAAS

FEBE / UHasseltInterim Chairman C6

Convenor TG 6.1 (Prestressed Hollow Core)

Member of several TG’s

COM6 & PCI

Joint work since 2008. Initially two separate meetings were held

Fib C6 - plenary

Fib C6/PCI

Today 1 integrated plenary meeting

On task group level : PCI member attend fib TG’s

Fib C6 members attend PCI-committees

Common publications

COM6 Active Task Groups

TG 6.1 Prestressed hollow core floorsMaas [BE]

TG 6.2 Quality control for precast concrete Fernandez [SP] & Frank [USA]

TG 6.3 Sustainability of structures with precast elements Fernández-Ordóñez [SP]

TG 6.4 Precast concrete towers for wind energy production Lucio[PT]


TG 6.5 Precast concrete bridges Corres [SP]

TG 6.6 Retrofitting and repair of precast structures in seismic areas Tsoukantas[GR] & Pampanin [NZ]

TG 6.7 Precast concrete in tall buildings Jones [IR]

TG 6.8 Terminology in prefabrication Krohn [USA]


TG 6.10 Precast concrete buildings in seismic areas – practical aspects Tsoukantas[GR]

TG 6.11 Precast insulated sandwich panels Hughes [AUS]

TG 6.12 Planning and design handbook on precast building structures Van Acker [BE]

COM6 Topics for future Task Groups

Precast Floors

Multifunctional Precast

Precast Cladding

Precast Stadiums

Precast Car Parks

Precast Handbook for special structures

COM6 Publications (published)

11 bulletins in 12 years Bulletin 6:

2000

Bulletin 74: 2015

COM6 Bulletin 74

First edition in 1994

COM6 Bulletin 74 – special edition‘fib members only’

100+ copies: 44,95 €/copy200+ copies: 29,95 €/copy500+ copies: 19,95 €/copy

COM6 Publications (wip)


Terminology Database explaining concrete

related terms

Plugin for (precast-) related websites

Cascade system

Glossary

Possibility to suggest better definitions

Hollow Core1. Prestressed slabs varying in thickness from 4 to 12 inches having hollow interior cores to reduce weight, generally extruded.

2. is a precast slab of (prestressed) concrete typically used in the construction of floors in multi-story apartment buildings. The precast concrete slab has tubular voids extending the full length of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The slabs are typically 120 cm wide with standard thicknesses between 15 cm and 50 cm.


Website General information

about COM6


Website News

Public

Members only

Work environment for TG’s

Web meetings


Website Dissemination of

knowledge Articles from COM6

members about Precast

Publications from COM6 members about precast

…

COM6 Publications Prestressed Hollowcore Floors

….

1988 - Precast prestressed hollow core floors (Thomas Telfort),

2000 - Special design recommendations for precast prestressed hollow core floors

2013 – Main work item of TG 6.1


TG 6.01: approx. 20 members

Belgian is well represented, close link with EU-standardisation Stef Maas (Convenor) Convenor of CEN TC229/WG1

Arnold Van Acker (Secretary)

Pieter Van der Zee Belgian delegate in CEN TC229/WG1/TG1

Ronald Klein-Holte Convenor of CEN TC229/WG1/TG1

New recommendations Approx. 300p.

Worked examples


9 Chapters

1 Introduction

2 General information

3 Design of the cross-section

4 Design of hollow core floors

5 Hollowcore in seismic regions

6 Building physics

7 Environmental issues

8 Design aspects regarding finished element

9 Design considerations regarding manufacture


3. Design of the cross-section

3.1 General

3.2 Basic design principle

3.3 Transfer of prestressing

3.4 Stresses in the transmission zone

3.5 Flexural capacity

3.6 Shear capacity

3.7 Shear and bending interaction

3.8 Shear capacity of elements subjected to torsion


3. Design of the cross-section

3.9 Punching shear capacity

3.10 Protruding strands


4. Design of hollow core floors

4.1 General

4.2 Structural integrity

4.3 Camber design and deflection

4.4 In-plane actions

4.5 Transversal load distribution

4.6 Structural toppings and composite action

4.7 Restrained composite supports

4.8 Non-rigid supports

4.9 Cantilevered slabs

4.10 Unintended support restrainment


4. Design of hollow core floors

4.11 Hollow core floors subjected to horizontal actions

4.12 Dynamic actions and vibrations

4.13 Fire resistance

4.14 Connections

4.15 Light load fixings

4.16 Openings and cut-outs


5. Hollow core in seismic regions

5.1 Introduction

5.2 General aspects

5.3 Diaphragm action of precast hollow core floors in seismic actions

5.4 Potential failure modes


6. Building physics

6.1 Thermal performances

6.2 Acoustic insulation


7. Environmental issues

7.1 Optimal use of raw materials

7.2 Controlled manufacture

7.3 Recycling of fresh and hardened concrete

7.4 Closed production system


8. Design aspects regarding finished elements

8.1 Dimensional tolerances

8.2 Slippage of prestressing tendons

8.3 Imperfections

8.4 Drainage holes

8.5 Repair and retrofitting

8.6 Test methods


9. Design considerations regarding manufacture

9.1 During casting

9.2 Immediately after casting

9.3 Sawing of slabs

9.4 Lifting of slabs

9.5 Storage

More information?

[email protected]

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