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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 31 (1996), S. 421-432 
    ISSN: 1572-9648
    Keywords: Masonry ; Macroscopic characterization ; Continuum mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Si studia la modellazione continua della muratura a blocchi, considerata come sistema discreto di corpi indeformabili, discutendo le proprietà di due continui equivalenti: un modello di Cosserat e uno di Cauchy. Nell' ambito della elasticità lineare, si forniscono le espressioni delle relazioni costitutive per le azioni di contatto, in funzione delle dimensioni, della forma e della disposizione dei mattoni. Modificando questi parametri geometrici si ottengono materiali equivalenti dotati di particolari vincoli interni. In alcuni rari casi il continuo di Cosserat vincolato si comporta come un continuo di Cauchy. Salvo queste eccezioni, il continuo classico è un modello inadeguato per la muratura a blocchi mentre un continuo dotato di struttura fornisce sempre risultati soddisfacenti.
    Notes: Abstract Continuum modeling for masonry-like material accounting for bricks or blocks texture is discussed. The constitutive functions for the contact actions—expressed in terms of size, shape and arrangement of the block assembly-are derived within the framework of the linear elastic Cosserat and Cauchy theories. By varying some important geometrical parameters: the scale factor between the wall and the blocks size, the shape of the bricks and their arrangement, micropolar materials with particular internal constraints are obtained. In a few situations the constrained continuum behaves as a Cauchy continuum. In general, the Cauchy continuum does not provide a proper description of the brick masonry behaviour while the structured continuum model, accounting for the mutual blocks rotation, gives satisfactory results.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 32 (1997), S. 581-583 
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 30 (1995), S. 673-683 
    ISSN: 1572-9648
    Keywords: Masonry ; Macroscopic characterization ; Continuum mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Viene presentato un modello di continuo con struttura atto a descrivere il comportamento meccanico di murature a blocchi, pensate come un sistema di corpi rigidi con contatti puntuali elastici. Il moto del sistema discreto e di quello continuo sono messi in relazione postulando una corrispondenzatra i campi di spostamento. Le funzioni costitutive delle azioni dinamiche del modello continuo sono ricavate uguagliando la potenza meccanica spesa in moti corrispondenti.
    Notes: Abstract A structured continuum model is formulated to describe the behaviour of block masonry modelled as distinct rigid body systems with elastic interfaces. A correspondence between the two motions is obtained by postulating a relationship between the displacement fields of the continuum and the discrete models. The constitutive functions for the dynamic actions of the continuum are derived by equating the power of the two models.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Nonlinear dynamics 13 (1997), S. 309-325 
    ISSN: 1573-269X
    Keywords: Nonlinear dynamics ; hysteretic oscillators ; periodic and non-periodic orbits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The equations governing the response of hysteretic systems to sinusoidal forces, which are memory dependent in the classical phase space, can be given as a vector field over a suitable phase space with increased dimension. Hence, the stationary response can be studied with the aids of classical tools of nonlinear dynamics, as for example the Poincaré map. The particular system studied in the paper, based on hysteretic Masing rules, allows the reduction of the dimension of the phase space and the implementation of efficient algorithms. The paper summarises results on one degree of freedom systems and concentrates on a two degree of freedom system as the prototype of many degree of freedom systems. This system has been chosen to be in 1:3 internal resonance situation. Depending on the energy dissipation of the elements restoring force, the response may be more or less complex. The periodic response, described by frequency response curves for various levels of excitation intensity, is highly complex. The coupling produces a strong modification of the response around the first mode resonance, whereas it is negligible around the second mode. Quasi-periodic motion starts bifurcating for sufficiently high values of the excitation intensity; windows of periodic motions are embedded in the dominion of the quasi-periodic motion, as consequence of a locking frequency phenomenon.
    Type of Medium: Electronic Resource
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