Ciclo di seminari: SCENARI ESTREMI SULLE STRUTTURE, 25 giugno 2013 ore 14.30 – 17.00, Aula riunioni Dip. di Ingegneria Strutturale e Geotecnica Facolta' di Ingegneria Civile e Industriale, Universita' degli Studi di Roma La Sapienza Via Eudossiana 18 - 00184 Roma

1. Oggetto: Ciclo di seminari
SCENARI ESTREMI SULLE STRUTTURE,
25 giugno 2013 ore 14.30 – 17.00,
Aula riunioni Dip. di Ingegneria Strutturale e Geotecnica
Facolta' di Ingegneria Civile e Industriale,
Universita' degli Studi di Roma La Sapienza
Via Eudossiana 18 - 00184 Roma.
Con piacere si comunicano agli interessati i seguenti seminari su temi relativi
a situazioni estreme e loro effetti sulle strutture:
14.45 – 15.30: Water-Driven Debris Impact Forces on Structures:
Experimental and Theoretical Program, Prof. Clay J. Naito, Lehigh
University.
15.30 – 16.15: Development of a Blast and Ballistic Resistant Insulated
Wall Panel., Patrick Trasborg, Lehigh University.
16.15 – 17.00:F lexural Models of Reinforced Concrete Beams
Under Blast Load, Flavio Stochino, Univesrita' degli Studi di Cagliari,
Cordialmente,
Roma, 19 giugno 2013
Prof.Dr.-Ing. Franco Bontempi,
Ordinario di Tecnica delle Costruzioni,
Facolta' di Ingegneria Civile e Industriale,
Dipartimento di Ingegneria Strutturale e Geotecnica,
UNIVERSITA' DEGLI STUDI DI ROMA "LA SAPIENZA",
Via Eudossiana 18 - 00184 Roma
tel. +39-06-44585.265, cell. +39-339-3956300
e-mail: franco.bontempi@uniroma1.it - franco.bontempi@francobontempi.org
web: www.francobontempi.org - http://w3.disg.uniroma1.it/bontempi/

2. Pag 2
Water-Driven Debris Impact Forces on Structures:
Experimental and Theoretical Program
Clay J. Naito, Ph.D., P.E.
Associate Professor and Associate Chair
Department of Civil and Environmental Engineering
Lehigh University
13 E Packer Ave
Bethlehem, PA 18015 USA
Email: cjn3@lehigh.edu
P:(610)758-6229 F:(610)758-5553, C:(484)239-8700
http://www.lehigh.edu/~cjn3
Abstract
Water-driven debris generated during tsunamis and hurricanes can impose substantial
impact forces on structures that are often not designed for such loads. This
presentation covers the design and results of an experimental and theoretical program
to quantify these potential impact forces. Two types of prototypical debris are
considered: a wood log and a shipping container.
Full-scale impact tests at Lehigh University were carried out with a wooden utility
pole and a shipping container. The tests were carried out in-air, and were designed to
provide baseline, full-scale results. A 1:5 scale shipping container model was used
for in-water tests in the Oregon State University large wave flume. These tests were
used to quantify the effect of the fluid on the impact forces.
Results from both experimental programs are presented and compared with
theoretical predictions. The analytical predictions are found to be in sufficient
agreement such that they can be used for design. A fundamental takeaway is that the
impact forces are dominated by the structural impact, with a secondary affect
provided by the fluid.

3. Pag 3
Short Bio.:
Clay Naito, Ph.D., P.E. is an Associate Professor and Associate Chair of the
Department of Civil and Environmental Engineering at Lehigh University in
Bethlehem, PA USA. He is a licensed professional engineer in the states of
California and Pennsylvania. He is an associate editor of the ASCE Bridge Journal
and the Chair of the Precast/Prestressed Concrete Institute Committee on Blast
Resistance and Structural Integrity. Prof. Naito’s research focuses on Experimental
and Analytical Evaluation of Reinforced and Prestressed Concrete Structures
Subjected to Extreme Events including Earthquakes, Tsunamis, and Intentional Blast
Demands.

4. Pag 4
Development of a Blast and Ballistic Resistant Insulated
Wall Panel
Patrick Trasborg
Department of Civil and Environmental Engineering
Lehigh University
13 E Packer Ave
Bethlehem, PA 18015 USA
P: 610-758-6254
Email: pat310@lehigh.edu
Abstract
Accidental and intentional detonations of high explosives are an unfortunate reality
for not only military facilities, but any building. In the United States, designing for
blast loads is required of all military and government structures. Additionally, there
has been a recent emphasis on constructing energy efficient, sustainable buildings.
Insulated concrete wall panels can meet both requirements due to the blast resistance
of reinforced concrete and the thermal properties of the interior insulation layer. This
research project focuses on improving the response of an insulated concrete panel to
explosions at both larger and small scaled distance, as well as the ballistic resistance
of the panel. Emphasis is placed on innovative, emulative reinforcement detailing to
improve far scale explosions, while shock resistant materials are utilized within the
insulation layer to improve small scale explosions and ballistic response. Static tests
are conducted under both point and uniform loading to obtain resistance functions to
predict the dynamic response of the insulated panel. Experimental, numerical, and
analytical results will be discussed.

5. Pag 5
Short Bio.:
Patrick Trasborg is a Ph.D. student at Lehigh University in Bethlehem,
Pennsylvania, United States. He obtained his BS and MS degrees from Lehigh in
2010 and 2012. He was a 2009 Moles Scholarship Award winner, a 2010 President’s
Scholar recipient, and awarded by PCI with a 2011-2012 Daniel P. Jenny Fellowship.
Patrick has been involved with numerical modeling for simulating shock wave
response in ballistic clay. He is currently a research assistant and Dean’s teaching
assistant working with Professor Clay Naito.

6. Pag 6
Flexural Models of Reinforced Concrete Beams
Under Blast Load
Flavio Stochino, Ph.D., P.E.
Department of Civil, Environmental Engineering and Architecture
Via Marengo 2, University of Cagliari
09123 Cagliari (CA) Italy
tel: +39 0706755410
fax: +39 0706755418
fstochino@unica.it - fstochino@gmail.com
http://unica.academia.edu/FlavioStochino
skype: flavio_stochino
Faculty of Architecture of the University of Sassari.
Palazzo del Pou Salit, Piazza Duomo 6,
07041 Alghero (SS), Italy
tel: +39079 9720403
Abstract
Nowadays, the issue of structural safety under blast loading has become a dramatic
problem. The tragic news of the terrorist attacks of recent years raise important,
urgent questions regarding the real safety and reliability of our buildings. Extreme
loads such as impacts, explosions, etc., can occur in everyday life with unexpectedly
high frequency. This seminar deals with the flexural failure of Reinforced Concrete
beams under blast loads. The main aim is to develop dynamic and energy models
capable of evaluating the response of R.C. under explosive load. The seminar is
composed of three sections. Various dynamic models are developed in Section 1,
taking into account the strain-rate sensitivity of both steel and concrete, as well as
other nonlinearities in structural behaviour. In Section 2, the same problem is solved
in a different way: starting from the principle of energy conservation. This procedure,
less accurate than the previous one, produces very good results regarding midspan
displacement, especially as it requires less computation time. In order to better
understand the phenomenon, with the aim of identifying the key parameters in
structural response, a sensitivity analysis is developed in Section 3. In this way it is

7. Pag 7
possible to attain simple predictive polynomial formulations and, finally, simple table
for early structural assessment of beams under blast load during the design
procedure.
Short Bio.:
Flavio Stochino is a Post. Doc. fellow at University of Sassari. He has defended his
Ph.D. thesis “FLEXURAL MODELS OF REINFORCED CONCRETE BEAMS
UNDER BLAST LOAD” on March 25th 2013 at University of Cagliari. His research
deals with extreme loads on structures and construction materials, in particular for
what concerns energy interactions and relationship between the structural
performance under seismic and blast loads. He’s interested in blast/impulsive loading
and fire design of R.C. structures, but also in structural optimization problems and
mechanics of laminated structures. He has produced several papers for international
journals and he has participated and presented academic papers in several
international conferences. You can find more information on his profile in
Academia.edu: http://unica.academia.edu/FlavioStochino.