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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