Caratteristiche ed evoluzioni delle costruzioni in legno nel tempo - Prof. Ing. Ario Ceccotti - FederlegnoArredo

Caratteristiche ed evoluzioni delle costruzioni in
legno nel tempo
Prof. Ing. Ario Ceccotti

Invited Professor - Boğaziçi Üniversitesi

                                            13/05/2021

legno nelle costruzioni – esperienza del passato
                                          pareti di
                    ibridi             muratura con
                   (misti)            travi, solai, tetti
                                          di legno

muratura e                                struttura
  legno                                  portante di
                                       legno irrigidita
                                        da muratura
                   compositi
                                          struttura
                                         portante di
                                          muratura
                                       rinforzata con
solo legno                                 il legno

Monte Athos

By courtesy of P. Touliatos

L’Aquila

Korea 2-3 June 2009

Firenze

“save the shape”

by F. Laner           by P. Touliatos

Santorini Akrotiri

       by P. Touliatos

by P. Touliatos

Mileto (VV)

         by N. Ruggieri

by F. Vieux-Champagne

Cibiana di Cadore

by P. Faccio

Turchia

by R. Langenbach

Portogallo

by R. Langenbach

legno nelle costruzioni
                                        pareti di
                                       muratura e
             ibridi                   solai (tetti) di
                                          legno

muratura e                               struttura
  legno                                 portante di
                                      legno irrigidita
                                       da muratura
             compositi
                                         struttura
                                        portante di
                                         muratura
                                      rinforzata con
solo legno                                il legno

Giappone     Cina

Japan      China

San Francisco

Alaska

Kobe (JP)

by M.Yasumura

by M.Yasumura

by M.Yasumura

by Forintek Canada

San Francisco

insegnamenti…

CLASSI DI RESISTENZA

Azione sismica alla base, di progetto

stesso volume

                                 cemento armato

legno
                                        acciaio

                   stesso peso

A

• A, Wood structure self weight: 120 tons
• B, Reinforced concrete structure self weight: 600 tons
• C, Additional permanent weight + service load: 150 tons

• ratio B+C/A+C ≈ 3

concrete           steel           glue laminated timber
                    30 (compression)   450 (tension)   28 (bending)

strength (MPa)
                    2,40               7,85            0,45

density (tonn/m³)
                    12,5               57,3            62,2
ratio

by E. Karacabeyli

Hughes H-4 Hercules ("Spruce Goose"), 1947

                                             1946 H. Hughes Spruce Goose

amplification factor

before the quake   after the quake…

NB: the area of the “hysteresis” cycles measures the quantity of dissipated energy

e.g.
     energy is dissipated
by friction within elements…

evidenza sperimentale
            by N. Ruggieri

CNR - IVALSA

CNR - IVALSA

by N. Ruggieri

by P. Faccio

IUAV Venezia

IUAV Venezia
                              M2

hazelnut branches
and mortar

IUAV Venezia

                  M5

bricks

IUAV Venezia

Seismic NIED  Tsukuba
        Performance of TFJapan
                          structures

NIED Tsukuba Japan

NIED Tsukuba Japan

NIED Tsukuba Japan

Avant le tremblement
                       NIED Miki-Kobe
                               Après un choc
                                             Japan

Après deux chocs                    Après trois chocs

NIED Miki-Kobe Japan

evoluzione

EUCENTRE Pavia

EUCENTRE Pavia

CLT ou X-Lam
in plane

stabilized and
self-reinforced structural wood

by Rasom Wood Technology

Castelrotto (BZ)

Rasom Holz&Co.

Self-tapping and self-drilling screws:

by Rasom Wood Technology

CNR IVALSA-UNITN-NIED

             In plane
             Cyclic Tests
             on walls and
             connections

Pseudo-
dynamic
tests on                        Shaking Table Test on a full-
one storey                      scale 7mx7mx10m of height,
specimen                        3 storeys XLam building

                 Shaking Table Test on a full-scale 7.5 mx13.5
                 mx23.5 m of height, 7storeys XLam building

CNR-IVALSA

                           5
                    x 10
               2

             1.5

               1

             0.5

 force [N]
               0

             -0.5

              -1

             -1.5
                                                                    cyclic test
                                                                    drain model
              -2
               -20             -15   -10   -5      0       5   10     15          20
                                           displacement [mm]

NIED MIKI-KOBE JAPAN

• by Rothoblaas

CNR IVALSA

Shaking Table Tests on 7-storey Building
                            BUILDING SELF WEIGHT 120 t
                          ADDITIONAL LOAD ON FLOORS 150 t

                  23.5m

13.5m
           7.5m

prima dei test

           dopo tutti I test…

F1
Grand prix de Belgique 2012

Resilience, the new challenge in earthquake
                                    engineering

                              Santiago Chile , 2017
• The motto of the Conference was: Resilience, the new challenge in
  earthquake engineering. This motto means that the actual seismic
  design criteria of “safety of life” requesting that buildings do not
  collapse must be replaced by codes that allow cities to continue
  operating in few days.

• These new society and government requirements are a consequence
  of the inability to evacuate millions of people of a mega-city.

Environmental «cost»:

Economical cost: difference Δ
between «normal» building and
«immediate occupancy» building

as a civil engineer
 I would never say that a construction material is better than an
 other material, but I can for sure say that:

                   with wood,
            resilience is reachable

at very competitive costs in comparison
        to traditional materials!

l’inizio…

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