Cronaca e analisi del crollo di Minneapolis.
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Cronaca e analisi del crollo di Minneapolis Franco Bontempi Professore Ordinario di Tecnica delle Costruzioni, Facoltà di Ingegneria, Università degli Studi di Roma La Sapienza Chiara Crosti Co-founder & CEO di StroNGER S.r.l. spin-off di ricerca e consulenza, www.stronger2012.com 27/10/2015 1
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Transcript of Cronaca e analisi del crollo di Minneapolis.
Cronaca e analisi del crollo di Minneapolis
Franco BontempiProfessore Ordinario di Tecnica delle Costruzioni, Facoltà di Ingegneria,
Università degli Studi di Roma La Sapienza
Chiara CrostiCo-founder & CEO di StroNGER S.r.l. spin-off di ricerca e consulenza,
www.stronger2012.com27/10/2015 1
1EVENT27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
2BEFORE27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
Bridge Scheme
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DNA - INTRINSIC NATURE OF THE BRIDGE STRUCTURE:Load Path – Redundancy – Robustness – Survaivability
Reliability - Availability – Maintenability - Safety
27/10/2015 [email protected]
3CONCEPTS27/10/2015 [email protected]
RESILIENCE
Time Horizon
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MACRO-LEVEL MESO-LEVEL MICRO-LEVEL
DESIGN
VARIABLESP
ER
FO
RM
AN
CE
LE
VE
LS
MA
CR
O-L
EV
EL
ME
SO
-LE
VE
LM
ICR
O-L
EV
EL
Structural System
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
Crossing the Threshold of Failure
Time (not scaled)
Cri
tica
l lo
ad (
no
t sc
aled
)
Original design
2007 modification1998
modification1977 modification
Instantaneous load
Lower bound of load
Upper bound of load
Failure level
Precise moment of failure
27/10/2015 [email protected]
3
Dead Load of Original 1967 Bridge
Compression
diagonal
Tension
diagonal
Orange and red shading:
exceeds yield stress
Stress
Yield
stress
0
Allowable
27/10/2015 [email protected]
After 1977 and 1998 Modifications
Orange and red shading:
exceeds yield stress
Compression
diagonal
Tension
diagonal
Stress
Yield
stress
0
Allowable
27/10/2015 [email protected]
Loads at Time of Accident
Compression
diagonal
Tension
diagonal
Orange and red shading:
exceeds yield stress
Stress
Yield
stress
0
Allowable
27/10/2015 [email protected]
4INVESTIGATIONS27/10/2015 [email protected]
HAZARD
IN-D
EPTH
DEFE
NCE
HOLES DUE TO
ACTIVE ERRORS
HOLES DUE TO
HIDDEN ERRORS
Failure Logic
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected] 40
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
27/10/2015 [email protected]
COSE – STRUTTURE - SISTEMITHINGS – STRUCTURES - SYSTEMS
PERSONE – COMPORTAMENTIPEOPLE – HUMAN BEHAVIOR
COSAWHAT
CHIWHO
ROTTURA – COLLASSO - CRISIFAILURES – COLLPASE - CRISIS
PERCHE’WHY
SPIEGAZIONE – CAUSEREASONS - DISCLOSUREC
ON
OSC
ENZA
KON
WLE
DG
E
Forensic Engineering
27/10/2015 [email protected]
27/10/2015 [email protected]
49/6149/61 StroNGER s.r.l
Start up innovativa ai sensi
del D.L. 179/2012
Stro N
GERwww.stronger2012.com
(Structures of the Next Generation – Energy harvesting and Resilience)
All’interno dell’incubatore
ITech di BIC Lazio
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Opening day was six years ago, and the I-35W bridge is needing repairs — some that come from our harsh winters, but some from improper installations.
27/10/2015 [email protected]
27/10/2015 [email protected]
