ABSTRACT. The composite nature of a wood continuum prevents one from extrapolating the results of... more ABSTRACT. The composite nature of a wood continuum prevents one from extrapolating the results of laboratory tests on standard wood specimens to structural elements of significant size. Therefore, these elements are usually tested under standardized loading conditions in order to detect a sort of average material behaviour. In this paper, the initial step consists, instead, of testing the material specimens. The extension of the results to structural elements is then pursued by introducing a random field, or, in a discretized model, a random array of imperfections. The calibration of the suitable spatial distribution of the imperfections is then investigated by a mixed experimental–numerical approach, for a reference beam. The analyses on the relative finite elements model are iterated to match the response of the full scale laboratory tests.
KEYWORDS: Biaxial tests; Finite element model; Imperfections; Laboratory tests; Random field; Wood specimens
Seismic Isolation of the IRIS Nuclear Plant. [ASME Conference Proceedings 2009, 289 (2009)]. Mass... more Seismic Isolation of the IRIS Nuclear Plant. [ASME Conference Proceedings 2009, 289 (2009)]. Massimo Forni, Alessandro Poggianti, Fosco Bianchi, Giuseppe Forasassi, Rosa Lo Frano, Giovanni Pugliese, Federico Perotti, Leone ...
Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing, 2013
ABSTRACT In this paper the capability of the Interpolation Damage Detection Method for damage det... more ABSTRACT In this paper the capability of the Interpolation Damage Detection Method for damage detection and localization on long span suspension bridges is investigated through a case study. The Shimotsui-Seto suspension bridge, in Japan is considered for simulating wind induced vibration response using a finite element model of the bridge and a spatially correlated wind action. Based on the response to vibrations induced on the bridge deck by a wind loading history, a ‘signature’ of the structure in the intact state has been obtained in terms of the power spectral densities of responses along the bridge deck. Subsequently, several damage scenarios have been simulated by reducing the stiffness of a limited number of elements along the bridge deck and the new damaged signature of the bridge in each of the damaged conditions has been obtained using a new wind loading history. Results show a good performance of the Interpolation Damage Detection Method to provide the correct identification of damage detection and localization for all the damage scenarios herein considered.
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2012
ABSTRACT This work deals on a straightforward methodology for analysing and identifying impact fr... more ABSTRACT This work deals on a straightforward methodology for analysing and identifying impact fractures in polypropylene commercial pipes through experimental tests and numerical procedures. The pipes are characterized by brittle behaviour at low temperature (0 degrees C). Laboratory experiments, at different conditions, explain the material behaviour and support the numerical study of the pipes to external blows and the dynamic simulation of the crack growth. The implemented numeric procedure enables us to follow the fracture path evolution by selectively deactivating the finite elements. Comparisons between impact tests and simulations, fracture toughness and the energy release rate, shows that the proposed method simulates the impact effects accurately and rapidly and allows the damage identification. Furthermore, the onset of clearly visible damage is correctly predicted.
ABSTRACT Electro-inductive devices have recently been introduced to implement passive control sch... more ABSTRACT Electro-inductive devices have recently been introduced to implement passive control schemes in special classes of structures. Their fascinating feature is the feasibility of large devices, to be installed, for instance, in long span bridges, much shorter than hydraulic dampers with identical maximum span. The characterization of an electro-inductive device with semi-active behavior is presented in detail in this paper. The paper also discusses ways of building a semi-active device, and details its passive control function.
ABSTRACT. The composite nature of a wood continuum prevents one from extrapolating the results of... more ABSTRACT. The composite nature of a wood continuum prevents one from extrapolating the results of laboratory tests on standard wood specimens to structural elements of significant size. Therefore, these elements are usually tested under standardized loading conditions in order to detect a sort of average material behaviour. In this paper, the initial step consists, instead, of testing the material specimens. The extension of the results to structural elements is then pursued by introducing a random field, or, in a discretized model, a random array of imperfections. The calibration of the suitable spatial distribution of the imperfections is then investigated by a mixed experimental–numerical approach, for a reference beam. The analyses on the relative finite elements model are iterated to match the response of the full scale laboratory tests.
KEYWORDS: Biaxial tests; Finite element model; Imperfections; Laboratory tests; Random field; Wood specimens
Seismic Isolation of the IRIS Nuclear Plant. [ASME Conference Proceedings 2009, 289 (2009)]. Mass... more Seismic Isolation of the IRIS Nuclear Plant. [ASME Conference Proceedings 2009, 289 (2009)]. Massimo Forni, Alessandro Poggianti, Fosco Bianchi, Giuseppe Forasassi, Rosa Lo Frano, Giovanni Pugliese, Federico Perotti, Leone ...
Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing, 2013
ABSTRACT In this paper the capability of the Interpolation Damage Detection Method for damage det... more ABSTRACT In this paper the capability of the Interpolation Damage Detection Method for damage detection and localization on long span suspension bridges is investigated through a case study. The Shimotsui-Seto suspension bridge, in Japan is considered for simulating wind induced vibration response using a finite element model of the bridge and a spatially correlated wind action. Based on the response to vibrations induced on the bridge deck by a wind loading history, a ‘signature’ of the structure in the intact state has been obtained in terms of the power spectral densities of responses along the bridge deck. Subsequently, several damage scenarios have been simulated by reducing the stiffness of a limited number of elements along the bridge deck and the new damaged signature of the bridge in each of the damaged conditions has been obtained using a new wind loading history. Results show a good performance of the Interpolation Damage Detection Method to provide the correct identification of damage detection and localization for all the damage scenarios herein considered.
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2012
ABSTRACT This work deals on a straightforward methodology for analysing and identifying impact fr... more ABSTRACT This work deals on a straightforward methodology for analysing and identifying impact fractures in polypropylene commercial pipes through experimental tests and numerical procedures. The pipes are characterized by brittle behaviour at low temperature (0 degrees C). Laboratory experiments, at different conditions, explain the material behaviour and support the numerical study of the pipes to external blows and the dynamic simulation of the crack growth. The implemented numeric procedure enables us to follow the fracture path evolution by selectively deactivating the finite elements. Comparisons between impact tests and simulations, fracture toughness and the energy release rate, shows that the proposed method simulates the impact effects accurately and rapidly and allows the damage identification. Furthermore, the onset of clearly visible damage is correctly predicted.
ABSTRACT Electro-inductive devices have recently been introduced to implement passive control sch... more ABSTRACT Electro-inductive devices have recently been introduced to implement passive control schemes in special classes of structures. Their fascinating feature is the feasibility of large devices, to be installed, for instance, in long span bridges, much shorter than hydraulic dampers with identical maximum span. The characterization of an electro-inductive device with semi-active behavior is presented in detail in this paper. The paper also discusses ways of building a semi-active device, and details its passive control function.
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Papers by Marco Domaneschi
In this paper, the initial step consists, instead, of testing the material specimens. The extension of the results to structural elements is then pursued by introducing a random field, or, in a discretized model, a random array of imperfections.
The calibration of the suitable spatial distribution of the imperfections is then investigated by a mixed experimental–numerical approach, for a reference beam. The analyses on the relative finite elements model are iterated to match the response of the full scale laboratory tests.
KEYWORDS: Biaxial tests; Finite element model; Imperfections; Laboratory tests; Random field; Wood specimens
In this paper, the initial step consists, instead, of testing the material specimens. The extension of the results to structural elements is then pursued by introducing a random field, or, in a discretized model, a random array of imperfections.
The calibration of the suitable spatial distribution of the imperfections is then investigated by a mixed experimental–numerical approach, for a reference beam. The analyses on the relative finite elements model are iterated to match the response of the full scale laboratory tests.
KEYWORDS: Biaxial tests; Finite element model; Imperfections; Laboratory tests; Random field; Wood specimens