light up! pro holz student trophy...abteilung tragwerkslehre univ.prof. dipl.-ing. peter bauer...

ITI - Department of

Structural Design and

Timber Engineering

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Pro Holz Student Trophy

Abteilung Tragwerkslehre

Univ.Prof. Dipl.-Ing. Peter BAUER

Associate Prof. Dipl.-Ing. Dr.techn. Alireza FADAI; Univ.Ass. Dr.techn. Felipe RIOLA PARADA

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Pilgrims in Vatican

Train accident in

Montparnasse 1895

Oilplatform in storm

Snowstorm in the Alps

Action forces

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Live load

Picture taken from: Der Ingenieurbau,

Tragwerkszuverlässigkeit , Einwirkungen

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Wind

rAir

~ 1.20 kg/m3

at 20°C on sea-level

The acting wind-force

depends therefore

on the velocity of the

air(molecules) in the

moment they hit a body

(negative acceleration). It

also depends on the form

of the body.

Windloads

Wind load

wVienna

~ 0.70…1.0 kN/m2

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Snowloads

Snow load

s~ m sK

sVienna

~ 1.0 kN/m2

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Earthquake

Peak ground acceleration

agr,Vienna

= 0.8 m/sec2 x 1.2 = 0.96 m/sec2 (for soil class B)

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Aufwand

Einwirkungen

Widerstände

„Sicherheit“

Semi-probabilistic safety concept

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CC1- 1*10-5

CC2- 1*10-6

CC3- 1*10-7

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Earth quake and individual risk

Required reliability:

Assumed:

50 Person-equivalents in existing building

15 Person-equivalents in extension

Pf,extension

=

(50* 10-5

+15* 10-6

)/(50+15)= 7.92*10-6

Leads to: asoll

= 0.30

Required factor of horizontal improvement

v~ 0.30/0.25= 1.20

Note: 2.35 Persons/flat

10aus der SIA entnommen:

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Balance individual and public risk

Retrofitting of existing buildings in case of

increasing number of individuals

No restrictions in case of adding

supplements like balconies, terraces,…

Objective

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NWall

VMAX

D =

H=

Failure if

V * H > N * D/2

V < N *(D/2)/H

Shear walls

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Mass and stiffness Mass and stiffness in

motion

Max 2 storeys + terrace

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PPAG architects –

Tunesian Village - Radetzkystrasse

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PPAG architects –

Tunesian Village - Radetzkystrasse

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RaU Architekten– Penthouse WEG

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RaU Architekten– Penthouse WEG

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Wohnhausanlage Brunnweg - Holbeingasse

Brunnweg 4 – Stiege 1 bis 7

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Ground floor

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3. Floor

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Vertical loads

Floor above last storey: Load bearing?

Floor-survey?

Ground floor masonry stress:

sEd

~ 0.85 N/mm2 <1.5 N/mm2 = fRd

Masonry-survey?

Foundation: Maybe not sufficient?

Foundation-survey?

Max 2 storeys + terrace

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Mass and stiffness in

motion

Horizontal loads

Calculation of required lateral

enforcement:

Individual risk existing building:

4 apartements x 5 floors x 2.35

= 47 individuals

Individual risk refurbished and

extended building:

47 + 2…6 *2.35 = 47 + 5…

15 = 52 .. 62 individuals

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Earth quake and individual risk

Required reliability:

Pf,extension

=

(50* 10-5

+15* 10-6

)/(50+15)= 7.92*10-6

Leads to: asoll

= 0.30

Required factor of horizontal improvement

v~ 0.30/0.25= 1.20

30aus der SIA entnommen:

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Ground-floor

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Horizontal loads

Calculation of required lateral

enforcement:

Individual risk existing building:

4 apartements x 5 floors x 2.35

= 47 individuals

Individual risk refurbished and

extended building:

47 + 2…6 *2.35 = 47 + 5…

15 = 52 .. 62 individuals

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NWall

VMAX

D =

H=

Failure if

V * H > N * D/2

V < N *(D/2)/H

Shear walls

Tension Anchor

in basement

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Ground floor

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Wohnhausanlage Pantucekgasse 33

Stiege 1 bis 4

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Storey-height:

16 rises of 16.9 cm = 270

cm

Slabs

Concrete ~ 18..20 cm

circumference support?

Walls

Concrete, prefebracated

Basement

Existing, mezzanine

Ground floor

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Horizontal loads

Calculation of required lateral

enforcement:

Individual risk existing building:

3 apartements x 5…8 floors x

2.35 = 36…57 Individuals

Individual risk refurbished and

extended building:

36..57 + 2…6 *2.35 = 36…57

+ 5… 15 = 41 .. 72 Individuals

Concrete walls usually

sufficient!

Vertical loads

Floor above last storey: Load bearing?

Floor-survey?

Ground floor wall stress:

Sufficient

Foundation: Maybe not sufficient?

Foundation-survey?

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Wohnhausanlage Maroltingergasse 19-25

Stiege 6 bis 10

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Ground floor

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Horizontal loads

Calculation of required lateral

enforcement:

Individual risk existing building:

4 apartements x 3 loors x 2.35

= 29 Individuals

Individual risk refurbished and

extended building:

29+ 2…6 *2.35 = 29 + 5… 15

= 34 .. 44 Individuals

Required factor of horizontal

improvement

v~ 0.30..0.35/0.25= 1.20..1.40

Vertical loads

Floor above last storey: Load bearing?

Floor-survey?

Ground floor masonry stress:

sEd

~ 0.85 N/mm2 <1.5 N/mm2 = fRd

Masonry-survey?

Foundation: Maybe not sufficient?

Foundation-survey?

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Thank you for your attention