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INIZIO_TESTO_DA_INDICIZZARE

RESEARCH PROGRAM

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Scientific and education field classification
International Patent Classification
  • FIXED CONSTRUCTIONS
    • CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES (of tunnels E21D)
      • CONSTRUCTION OF BRIDGES [N: elevated roadways] OR VIADUCTS; ASSEMBLY OF BRIDGES (bridges extending between terminal buildings and aircraft for embarking or disembarking passengers B64F1/305; [N: tracks for special kinds of railways E01B25/00; culverts E01F5/00B])
      • PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS (derailing or rerailing blocks on track, track brakes or retarders B61K)
  • PHYSICS
    • CONTROLLING; REGULATING (specially adapted to a particular field of use, see the relevant place for that field, e.g. A62C37/00, B03B13/00, B23Q)
      • CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (fluid-pressure actuators or systems acting by means of fluids in general F15B; valves per se F16K; characterised by mechanical features only G05G; sensitive elements, see the appropriate subclass, e.g. G12B, subclass of G01, H01; correcting units, see the appropriate subclass, e.g. H02K)
    • MEASURING (counting G06M); TESTING
      • MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES (generation of mechanical vibrations without measurement B06B, G10K; measuring position, direction or velocity of an object G01C, G01S; measuring quasi-steady pressure of a fluid G01L7/00; determining unbalance G01M1/14; determining properties of material by sonic or ultrasonic waves transmitted therethrough G01N; systems using the reflection or reradiation of acoustic waves, e.g. acoustic imaging, G01S15/00; seismology, seismic prospecting, acoustic prospecting G01V1/00; acousto-optical devices per se G02F; obtaining records by techniques analogous to photography using ultrasonic, sonic or infrasonic waves G03B42/06; speech analysis or synthesis, speech recognition G10L; information storage based on relative movement between record carrier and transducer G11B; piezo-electric, electrostrictive or magnetostrictive elements in general H01L; manufacture of electromechanical resonators by processes which include measurement of frequency with consequential modification of the resonator H03H3/00, [N: H03H3/007, H03H9/00]) [C9809]
Geographical classification
Bibliografia
[1] Sohn H, Farrar C. R., Hemez F. M., Shunk D. D., W. Stinemates D. W., Nadler B. R., A Review of Structural Health Monitoring Literature: 1996–2001 (2003), Los Alamos National Laboratory Report, LA-13976-MS.
[2] Carder D.S. (1937), Observed vibrations of bridges, Bulletin, Seism. Soc. Of America, 27, pp. 267-303.
[3] Brownjohn J. M. W., Moyo P., Omenzetter P., Chakraborty S. (2005), Lessons from monitoring the performance of highway bridges, Struct. Control Health Monitoring, 12, pp. 227-244.
[4] Brownjohn J. M. W., Dumanoglu A.A, Severn R.T., Taylor C.A., (1987), Ambient vibration measurements of the Humber suspension bridge and comparison with calculated characteristics, Proc. ICE Part 2, 83, pp. 561-600.
[5] Jensen J. (2006), Strategies for operation and maintenance of the Great Belt link, Proc. IABSE Conference on “Operations, Maintenance and Rehabilitation of Large Infrastructure Projects, Bridges and Tunnels”, Copenhagen, Denmark May 15-17.
[6] Fujino Y., Kashima S. (2006), Monitoring of Akashi Kaikyo Bridge, Proc. Int. Conf. on “Smart Structures and Materials and NDE for Health Monitoring and Diagnostics”, San Diego, California USA. 26 February – 2 March.
[7] Bernal D., Beck J., (2004). Special Structural Health monitoring benchmark, Section: Phase I of the IASC-ASCE, J. Engrg. Mech., ASCE, 130 (1).
[8] AA.VV. (2001). Atti del Workshop "Problemi di vibrazioni nelle strutture civili e nelle costruzioni meccaniche", Perugia (Italy), 12 ottobre 2001, a cura di Materazzi A.L. e Breccolotti M.
[9] AA.VV. (2006). Atti del 2° Workshop "Problemi di vibrazioni nelle strutture civili e nelle costruzioni meccaniche", Perugia (Italy), 10-11 giugno 2006, a cura di Materazzi A.L., Breccolotti M., Cluni F. e Venanzi I., ISBN 88-6074-021-5.
[10] Lifshitz L. M., Rotem A. (1969). Determination of reinforcement unbonding of composites by a vibration techniques, Journal of Composites Materials, 3.
[11] Spyrakos C., Chen, H.L., Stephens, J., Govidaraj, V. (1990). Evaluating Structural Deterioration Using Dynamic Response Characterization, Proc. Intelligent Structures, Elsevier Applied Science, pp. 137–154.
[12] Salawu O.S., Williams C. (1994). Damage location using vibration mode shapes, Proc. IMAC-1994, pp. 933-939.
[13] Farrar C. R., Doebling S.W. (1997). Lessons learned from application of vibration-based damage identification methods to a large bridge structure, Proc. Structural Health Monitoring Intl. Workshop, pp. 351-370.
[14] Fryba L., Pirner M. (2001). Load test and modal analysis of bridges, Engineering Structures, 23, pp. 102-109.
[15] Brincker R., Andersen P., Cantieni R. (2001). Identification and level I damage detection of the Z24 highway bridges, Experimental techniques.
[16] Patil D.P., Maiti S.K. (2003). Detection of multiple cracks using frequency measurements. Engineering Fracture Mechanics, 70, pp. 1553-1572.
[17] Lin H.P., Chang S.C., Wu J.D. (2002). Beam vibrations with an arbitrary numbers of cracks. Journal of Sound and Vibration, 258, pp. 987-999.
[18] Kim J.T., Stubbs N. (2003). Crack detection in beam-type structures using frequency data. Journal of Sound and Vibration, 259, pp. 145-160.
[19] Maeck J., Abdel Wahab M., Peeters B., De Roeck G., De Visscher J., De Wilde W.P., Ndambi J.-M., Vantomme J. (2000). Damage identification in reinforced concrete structures by dynamic stiffness determination, Engineering Structures, 22, pp. 1339-1349.
[20] Neild S.A., McFadden P.D., Williams M.S. (2003). Nonlinear vibration characteristic of damaged concrete beams. Journal of Structural Engineering, 129, pp. 260-268.
[21] Owen J.S., Eccles B.J., Choo B.S., Woodings M.A. (2001). The application of auto-regressive time series modelling for the time-frequency analysis of civil engineering structures. Engineering Structures, 23, pp. 521-536.
[22] Saavedra P.N., Cuitiño L.A. (2001). Crack detection and vibration behaviour of cracked beams. Computer and Structures, 79, pp. 1451-1459.
[23] Petryna Y.S., Krätzig W.B. (2005). Compliance-based structural damage measure and its sensitivity to uncertainties. Computer & Structures, 83, pp. 1113-1133.
[24] Gentile C., Martinez Y Cabrera F. (1997). Dynamic investigation of a repaired cable-stayed bridge, Earthquake Engineering & Structural Dynamics, 26, pp. 41-59.
[25] Gentile C., Martinez Y Cabrera F. (2004), Dynamic performance of twin curved cable-stayed bridges, Earthquake Engineering & Structural Dynamics, 33, pp. 15-34.
[26] Limongelli M.P., Pezzoli P. (1994). An experimental analysis of masonry structures excited by shaking table, European Earthquake Engineering, 2-94, pp. 18-30.
[27] Gentile C. (2001). Full-scale testing and system identification of a steel-trussed bridge, in Structural Engineering Mechanics and Computation (A. Zingoni Ed.), Vol. 1, 591-598, Elsevier.
[28] Breccolotti M., Franceschini G., Materazzi A.L. (2004). Sensitivity of dynamic methods for damage detection in structural concrete bridges. SHOCK AND VIBRATION. vol. 3-4 pp. 383-394 ISSN: 1070-9622.
[29] Breccolotti M., Materazzi A L.. (2005). RC beams damage detection through probabilistic analysis of the dynamic response. 9th Intl. Conf. on Structural Safety and Reliability (ICOSSAR 2005). Rome, Italy, June 19-23.
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Keywords
STRUCTURAL MONITORING, STRUCTURAL DAMAGE, HEALTH MONITORING, DYNAMIC METHODS, PROBABILISTIC METHODS

Health assessment and monitoring of civil engineering structures through advanced dynamics methods

Università degli Studi di Perugia
Abstract
The research project is aimed at the optimal resource allocation for the maintenance of civil engineering structures through the improvement of the knowledge of their service behavior and through the development of health monitoring and assessment techniques based on dynamic diagnostic methods.
The optimization will be achieved by merging the current technical-scientific knowledge with new methodologies that will lead to significant overall innovation. The general objectives are:
a) developing methodologies and equipments for estimating the structural integrity by monitoring the dynamic response, with main focus on highway and railway infrastructures and buildings belonging to the historical heritage;
a) providing unambiguous methods for damage assessment in order to make the design, construction and management process of civil engineering structures economically more effective for the whole service life;
c) collecting, recording, refining, disseminating, and promoting the specific knowledge in the field, in order to have the construction industry benefit from this information.
The complexity of the fixed targets requires the synergistic effort of a wide range of expertise in the civil engineering field.
For this reason the study will be carried out with the joint contribution of researchers belonging to 5 different units, some of them already collaborating in previous national research projects like the PRIN 2004 “VINCES >>>

Principal Investigator
Annibale Luigi Materazzi Università degli Studi di PERUGIA
Research Objectives
The main goal of the present proposal is to improve the knowledge of the service behaviour of existing structures, with special reference to the infrastructures and buildings with historical and artistic significance in order to immediately identify the onset of damage that can prejudice safety and to give useful information for their maintenance, within the general framework of the optimal resource allocation.
This goal can be obtained through the following intermediate achievements:
A) developing methodologies and equipments for the periodical or permanent, monitoring of “strategical” buildings;
B) providing a method for the identification and location of damage and for the assessment of the severity of the damage of existing buildings, based on the analysis of their dynamic response to both artificial and ambient excitation.
C) collecting, recording, refining, disseminating, and promoting the specific knowledge in the field, in order to have the construction industry benefit from this information.
To obtain each one of the intermediate achievements, the following tasks are planned:
Intermediate achievement A:
- Collect of literature and experimental data concerning the equipment available for the design of new acquisition systems of the structural dynamic response, with particular reference to innovative technologies based on remote control systems and connected through “wireless” technology and data transmission systems >>>

Timescale
24 months
National and international background
During their service life, civil engineering structures are subjected to damage due to the effects of the changes of the material properties (consequence of aging and chemical-physical interaction with the environment) and of the applied forces (both ambient and anthropic forces). Often these phenomena can realize simultaneously, giving rise to particularly unfavorable conditions.
The corresponding damage can lead to the decrease of the structural safety, can prejudice the structural service-ability and can reduce the duration of the service life.
The economical consequences of these phenomena are relevant in the case of infrastructures systems but can be significant, although not always easily quantifiable, also in the architectural heritage area.
It is very well known the case of the maintenance of the highway and railway bridges, that involves the allocation of very relevant resources for the collectivity.
On those themes have been carried out important research projects, like the BRIME (Bridge Management in Europe) and SAMCO (Structural Assessment, Monitoring and Control) funded by the European Union.
A wide report on the state of the art on these topics can be found in Sohn et. al (2003) [1].
The current tendency is to keep under observation the “sensitive” structures in order to suddenly identify the onset of the damage and being able to intervene before the damage consequences require too costly repairs.
One of the >>>