Timber Engineering UnitUniversity of Innsbruck

Roland Maderebner | 22.11.2018

3

5

7

8

Column-Slab-

FINISH(Stefan Zöllig)

SYSTEM SOLUTION FOR

POINT SUPPORTED FLAT SLABS WITH CLT-ELEMNTS

(OF SPRUCE WOOD)

… a rear species …

STATE OF THE ART

STATE OF THE ART

STATE OF THE ART

STATE OF THE ART

STATE OF THE ART

STATE OF THE ART

BROCKEN COMMON

Quelle: http://www.structuremag.org

BROCKEN COMMON

Quelle: http://www.structuremag.org

4,50 m

2,85 m

SPIDER CONNECTOR | ANWENDUNGSGEBIETE

POINT SUPPORTED FLAT SLAB

Comparison ceiling height / construction height

Point Supporten vs. Standard

POINT SUPPORTED FLAT SLAB │ CHALLENGES

POINT SUPPORTED FLAT SLAB │ CHALLENGES

POINT SUPPORTED FLAT SLAB │ CHALLENGES

POINT SUPPORTED FLAT SLAB │ CHALLENGES

??

Rolling shear failure

Compression failure

CLT joint

POINT SUPPORTED FLAT SLAB │ ETH - ZÜRICH

SAMPLEPROJECT: Boîte Avenir

(Zöllig, S.)

POINT SUPPORTED FLAT SLAB │ ETH - ZÜRICH

Tests with beech LVL - plywood

(Zöllig, S.)

POINT SUPPORTED FLAT SLAB │ ETH - ZÜRICH

V=70 kN/m

?

V=40 kN/m

?

But how handle the high forces?

(Zöllig, S.)

POINT SUPPORTED FLAT SLAB │ CONCRETE CAPITAL

POINT SUPPORTED FLAT SLAB │ DESIGN CRITERION

POINT SUPPORTED FLAT SLAB │ STATE OF THE ART

CONCRETE │ APPLICATION

POINT SUPPORTED FLAT SLAB │ CHALLENGES

WITH SPRUCE

POINT SUPPORTED FLAT SLAB │ CHALLENGES

STEP 1: CONCENTRATED LOAD APPLICATION

POINT SUPPORTED FLAT SLAB │ IDEA

column

POINT SUPPORTED FLAT SLAB │ IDEA

column

headplate

POINT SUPPORTED FLAT SLAB │ IDEA

columnheadplate

load-transfer

POINT SUPPORTED FLAT SLAB │ IDEA

CLT-board

load-

transfer

Note: CLT-elements with a

balanced ratio of the stiffness

POINT SUPPORTED FLAT SLAB │ IDEA

core +

cantilevers

POINT SUPPORTED FLAT SLAB │ IDEA

cantilevers-

expanded

POINT SUPPORTED FLAT SLAB │ IDEA

CLT-board

screws

POINT SUPPORTED FLAT SLAB │ IDEA

load-

transfer

POINT SUPPORTED FLAT SLAB │ IDEA

Column

upper floor

SPIDER CONNECTOR | PROTOTYPE (Vers. 0)

column base

cantilever

screws

Load-transfer

bolt

column head

SPIDER CONNECTOR | FINAL

coupling disc+

top plate

arm with

VGU washer

screwssteel cylinder

bottom plate

king screw

coupling cone

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support (assembling)1

column head

CLT-element

drillhole d=80 mm

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support

Suspension

Reinforcement (V+M)arms screws

1

2

3

e

column head

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support

Suspension

Reinforcement

Transfer

column base

1

2

3

4

loads from upperfloors

column head

arms screws

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support

Suspension

Reinforcement

Transfer

Fire protection5

1

2

3

4

floor height

loads from upperfloors

column head

arms screws

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support

Suspension

Reinforcement

Transfer

Fire protection

Sound insulation

5

1

2

3

4

6

floor height

loads from upperfloors

column head

arms screws

SPIDER CONNECTOR

Philosophy: “Activation of all load carrying capacities”

Support

Suspension

Reinforcement

Transfer

Fire proetection

Sound insulation

CLT joint?

5

1

2

3

4

6

7

M

N

V

V

MN

floor height

loads from upperfloors

column head

arms screws

SPIDER CONNECTOR

LOAD BEARING BEHAVIOR

SPIDER CONNECTOR

LOAD BEARING BEHAVIOR | COMPONENTS

SPIDER CONNECTOR

LOAD BEARING BEHAVIOR | COMPONENTS

SPIDER CONNECTOR

LOAD BEARING BEHAVIOR | COMPONENTS

arms as bending plates

Variation of the screw

distances

SPIDER CONNECTOR

LOAD BEARING BEHAVIOR | TOTAL MODEL

Slab: 200/7l

SPIDER

- 5 m -

EXPERIMENTAL PUNCHING TESTS

KMD

WA

1000 kN

TEST SETUP

200

Asupport=400 cm²

load upper floors

floor load: 10 kN/m²

Spider

1 2 3

screws

200

200 200

CLT 7l | 200 mm

GL 3

2h

Asupport=400 cm² Asupport=321 cm²

TEST SETUP

200

Asupport=400 cm²

CLT 7l | 200 mm

GL 3

2h

1

200

load upper floors

floor load: 10 kN/m²

Spiderscrews

REFERENCE – unreinforced 1

REFERENCE – unreinforced

Note EC 5, Annex K:

0 5 10 15 20 25 30 35 40

0

100

200

300

400

500

600

700

800K

raft [kN

]

Verformung [mm]

Unverstärkt

Querdruckverstärkung

mittels VGS

Spider

3

,90 210

2005 / ²

200c N mm = =

compression failure

200

Asupport=400 cm²

,90,R ,90,lay, ,90 3 / ²1,8 5,4c k c k cf f N mmk == =

11

Deformation [mm]

Fo

rce

[kN

]

unreinforced

support reinforcement with

screws

Spider-Connector

REFERENCE - unreinforced

plastically deformation

1

RESULTS

200

Asupport=400 cm²

200

GL 3

2h

1 2

200 kN

CLT 7l | 200 mm

200

Asupport=400 cm²

load upper floors

floor load: 10 kN/m²

Spiderscrews

REINFORCEMENT WITH SELF TAPPING SCREWS

compression reinforcement

with 25 FTS 9/160

2

REINFORCEMENT WITH SELF TAPPING SCREWS

Asupport=400 cm²

2002

3

,90 210

40010 / ²

200c N mm = =

0 5 10 15 20 25 30 35 40

0

100

200

300

400

500

600

700

800K

raft [kN

]

Verformung [mm]

Unverstärkt

Querdruckverstärkung

mittels VGS

Spider

rolling shear failure

start of compression failure

mechanism

2

unreinforced

support reinforcement with

screws

Spider-Connector

Deformation [mm]

Fo

rce

[kN

]

REINFORCEMENT WITH SELF TAPPING SCREWS2

REINFORCEMENT WITH SELF TAPPING SCREWS

compression failure

rolling shear failure

2

RESULTS

200 200 200

GL 3

2h

1 2 3

200 kN 350 kN

200

CLT 7l | 200 mm

load upper floors

floor load: 10 kN/m²

Spiderscrews

Asupport=400 cm² Asupport=400 cm² Asupport=321 cm²

SPIDER CONNECTOR - ASSEMBLING

superelevation

3

SPIDER CONNECTOR – TEST SETUP3

SPIDER CONNECTOR3

0 5 10 15 20 25 30 35 40

0

100

200

300

400

500

600

700

800

Kra

ft [

kN

]

Verformung [mm]

Unverstärkt

Querdruckverstärkung

mittels VGS

Spider

bending/tension failure

rolling shear failure

Asupport=321 cm²

2003

unreinforced

support reinforcement

with screws

Spider-Connector

RESULTS

200 200 200

Spider

GL 3

2h

1 2 3

200 kN 350 kN 700 kN

200

CLT 7s | 200 mm

load upper floors

floor load: 10 kN/m²

screws

Asupport=400 cm² Asupport=400 cm² Asupport=321 cm²

CHARACTERISTIC PARAMETERS

1 2 3

,

,

, 1

170

08

est Rk

est Rk

est Rd mod

M

F kN

FF Nk k

=

= =

,

,

650

400

est Rk

est Rd

F kN

F kN=

=,

,

300

192

est Rk

est Rd

F kN

F kN=

=

( 1 m )0 ²eA = ( 1 m )8 ²eA = ( 4 m )0 ²eA =

100 % +178 % +285 %

200

CLT 7l | 200 mm

Spider

load upper floors

floor load: 10 kN/m²

screws

POINT SUPPORTED FLAT SLAB | TOTAL CONCEPT

STEP 2

?STEP 1

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

SCREWS – STATE OF THE ART

+ Work with well known components

- Load bearing behaviour?

- Stiffness?

- Screw bonded system probably necessary (…)

- Ceiling underside

- Fire protection

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

Tests

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

100 %

50 %Bendin

gstiffness

[Nm

m²]

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

SCREWS

+ Work with well known

- Load bearing behaviour

- Stiffness

- Screw bonded system necessary

- Ceiling underside?

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

SCREWS versus REACTION RESIN

+ Work with well known - Working with unknown

- Fire protection +/- Fire protection?

- Load carrying behaviour +/- Load carrying behaviour?

- Stiffness +/- Stiffness?

- Screw bonding necessary + Screw bonding not necessary

- Ceiling underside? + Uniform ceiling underside

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

POLYMER CONCRETE: Consistency adjustable

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

POLYMER CONCRETE : Bending stiffness

3 %

100 % 97 %

Bendin

gstiffness

[Nm

m²]

Reference PC

SPIDER CONNECTOR SYSTEM │ BOARD JOINT

PC-DOVETAIL: Fire protection

fire lamellatension strength

45 MPa

POINT SUPPORTED FLAT SLAB | TOTAL CONCEPT

STEP 1 STEP 2

u [-]

1.0

0.9

0.8

0.7

0.6

0.5

0.5

0.4

0.3

0.2

0.1

0.0

Max : 1.0

Min : 0.0

1.0

IsometrieRF-DYNAM FA1Eigenform Nr. 3 - 6.65433 Hz

POINT SUPPORTED FLAT SLAB | SERVICEABILITY STATE

GOOD VIBRATIONS (Start October 2018)

acce

lera

tio

n

t

Stütze – Decke – Stütze!

(Zöllig, S.)

SPIDER CONNECTOR

Column – Slab – Finish

«Build without joists»

CLT–board: 20 - 32 cm

Column grid: 5,0 – 7,0m

Net load: ≤ 10 kN/m²

SPIDER CONNECTOR │ APPLICATION AREA

SPIDER CONNECTOR │ APPLICATION AREA

SPIDER CONNECTOR │ APPLICATION AREA

POINT SUPPORTED FLAT SLAB | TOTAL CONCEPT

STEP 1 STEP 2

CANTILEVERS

CANTILEVERS | BALCONY

VERSION

BALCONY | EUROCODE 1

4 kN/m²

8,5 kNm/m0,5 kN/m

0,5 kNm/m

BALCONY | EUROCODE 1

0,5 kNm/m

2x1 kN/m

4 kNm/m

2x1 kN/m

2,3 kNm/m

6,8 kNm/m

2x0,25 kN/m

4 kN/m²

8,5 kNm/m0,5 kN/m

0,5 kNm/m

CANTILEVERS │ PROBLEM

Cantilevers – Balcony, projecting roofs, … building physics optimized

CANTILEVERS │ PROBLEM

Slab

Facade

Balcony

Wall

Therm

al

insula

tion

Airth

igt

layer

BUILDING PHYSIC | AIR TIGHTNESS

„Please mind the gap“

„PLEASE MIND THE GAP“

BALCONY │ STATE OF THE ART

Cantilevers with CLT-elements

CLT-Wall

Facade

Insula

tion

Continuous

Panel

BALCONY │ STATE OF THE ART

Cantilevers with beams

WallFacade

Continuous

Beam

BALCONY │ STATE OF THE ART

Beams | decoupled version?

Beam

Wall

Beam joint

Steel profile

BALCONY │ STATE OF THE ART

Beams | decoupled version?

Slab-beam

Facade

JO

INT

Steel profile

Balcony beam

Wall

Th

erm

al

insula

tion

Airth

igt

layer M

N

V

V M

N

Tension

Compressione

M = F ∙ e

BALCONY │ STATE OF THE ART

Forces due to net loads

1,575 /

Shear 4 2 12 / (12

8Tension/Compress

00 / )

ion0,16

1,5

d

d

kN m

V kN m k

e

m

M

g

= =

= =

=

=

M

N

V

V

M

N

tension

compression

e shear

BALCONY │ CASE OF DAMAGE?

CANTILEVERS │ PROBLEM

Cantilevers – Balcony, projecting roofs, … building physics optimized

CANTILEVERS | CONCRETE THERMAL DECOUPLING

120 – 260 EUR / m

BRIDGE CONNECTOR | VERSION

BRIDGE CONNECTOR

Philosophy: “Activation of all load carrying capacities”

BRIDGE CONNECTOR

Assembling

Building slab

Outwall

Building bracket

Airtight layer

BRIDGE CONNECTOR

Assembling

Thermal insulation

Coupling-element

Tension element

Fire protection

board

Building slab

Outwall

Building bracket

Airtight layer

BRIDGE CONNECTOR

Assembling

Cantilever

Facade

Cantilever bracket

Building slab

Outwall

Building bracket

Airtight layerThermal insulation

Coupling-element

Tension element

Fire protection

board

Floor top

BRIDGE CONNECTOR

Assembling

BRIDGE CONNECTOR | VARIABILITY

BRIDGE CONNECTOR | SOUND INSULATION

Sound insulation

Sound insulation

BRIDGE CONNECTOR | EXPERIMENTAL TESTS

BRIDGE CONNECTOR | RESONANCE FREQUENCY TESTS

BRIDGE CONNECTOR │ APPLICATION

BRIDGE CONNECTOR | NEW CONSTRUCTION METHOD

Building

Balcony

?

?

?External

Wall

Ground plan

BRIDGE CONNECTOR | NEW CONSTRUCTION METHOD

CLT-Slab

Bridge Connector

BRIDGE CONNECTOR | NEW CONSTRUCTION METHOD

CLT-Slab

Bridge Connector

Prefabrication

Cantilever elements

BRIDGE CONNECTOR | NEW CONSTRUCTION METHOD

CLT-Slab

Bridge Connector

Prefabrication

Cantilever elements

„Fair weather

installation“

Tag der Befestigung

PROJECT PARTNERS

- SPECIAL THANKS TO

Roland Maderebner

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften Arbeitsbereich Holzbau

Österreich

Bernhard Maurer

Universität Innsbruck Institut für Konstruktion und Materialwissenschaften

Arbeitsbereich Holzbau

Michael Flach

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften Arbeitsbereich Holzbau

Philipp Zingerle

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften

Arbeitsbereich Holzbau

Peter Lang

Rothoblaas Srl

Etschweg 2/1

Kurtatsch

Italien

Roland Maderebner

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften Arbeitsbereich Holzbau

Österreich

Bernhard Maurer

Universität Innsbruck Institut für Konstruktion und Materialwissenschaften

Arbeitsbereich Holzbau

Michael Flach

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften Arbeitsbereich Holzbau

Philipp Zingerle

Universität Innsbruck

Institut für Konstruktion und Materialwissenschaften

Arbeitsbereich Holzbau

Peter Lang

Rothoblaas Srl

Etschweg 2/1

Kurtatsch

Italien

TEAM

Roland Maderebner

Bernhard Maurer

Michael Flach

Philipp Zingerle

Peter Lang

… . Q U E S T I O N S