1,721,016 research outputs found
Indagine Sperimentale sul Comportamento di Giunti di Continuità di Volte in Legno Lamellare a Nervature Incrociate
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Rinforzo di murature esistenti mediante intonaco armato con rete in GFRP
No full textNel presente articolo sono illustrati i risultati di una campagna sperimentale eseguita su campioni di muratura per
valutare l'efficacia di una tecnica di rinforzo basata sull’applicazione di un intonaco armato con rete in materiale
composito di fibre di vetro in matrice polimerica GFRP (glass fiber reinforced polymer). In particolare, si fa
riferimento a prove di compressione diagonale in modo da verificare l’efficacia del rinforzo a taglio. Sono prese in
considerazione tre diverse tipologie di muratura (in mattoni a due teste, in pietra con spessore 400 mm e in ciottoli
con spessore 400 mm) e tre differenti tipologie di malta per l’intonaco (malta di calce, malta bastarda e malta di
calce e pozzolana). Prove di compressione centrata su pannelli non rinforzati sono state condotte per determinarne
la resistenza a compressione ed il modulo elastico. Sono riportati, inoltre, gli esiti di indagini sperimentali condotte
per verificare l’aderenza della rete GFRP all’intonaco (pull-out) e l’efficacia della giunzione per sovrapposizione
tra reti (lap-splice), confrontando i risultati di due diversi metodi di prova (su campioni a cilindro e a lastra)
Experimental and numerical characterization of the cyclic behaviour of unreinforced and reinforced mansonry structures
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"Moment redistribution in continuous steel-concrete composite beams with compact cross-section"
No full textThe paper investigates the design of continuous steel-concrete composite beams with compact cross section using the elastic analysis with limited redistribution. The permissible moment redistribution which satisfies the requirements of the ultimate limit state
(collapse) and serviceability limit state (crack width in the concrete slab) was computed. An advanced finite element program accounting
for all mechanical nonlinearities and time-dependent phenomena (creep and shrinkage of concrete) was used. An extensive parametric analysis aimed to determine the influence of several geometrical parameters on the permissible moment redistribution was carried out on propped cantilevers and fixed-end beams. The analyzed parameters include the shape of the steel profile, the ratio between the depths of
concrete slab and steel beam, the steel to concrete area ratio, and the reinforcement percentage of the concrete slab. The analysis was
limited to compact steel sections (AISC 360-05) or class 1 steel sections (Eurocode 3) and low ductility reinforcing steel (elongation at maximum load epsilonru=2.5%). The moment redistribution domain which satisfies the rotation compatibility in the critical sections, due to the attainment of the rupture of the reinforcement or the local buckling of the steel profile, and the control of cracking (<0.3 mm) in service
was evaluated and compared with the limits recommended by current codes of practice. A proposal for the allowable moment redistribution
domain according to the limits of the study was given
Allowable moment redistribution in the structural design of continuous steel-concrete composite beams
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Numerical Study on the Performance and Failure Modes of Bolted Connections in Pultruded-Fibre-Reinforced Polymer (PFRP) Profiles
Full text linkThe use of pultruded-fibre-reinforced polymer (PFRP) composite profiles in structural applications is rapidly increasing, due to their high strength-to-weight ratio, corrosion resistance, and durability. Bolted joints between PFRP play a critical role, as localized high stresses in a material that typically exhibits brittle behaviour—especially in tension and shear—can lead to sudden failure. This study aims to investigate the mechanical performance of such bolted connections (in terms of stiffness, strength, displacement capacities and failure modes), contributing to the development of reliable yet optimized design criteria for structural applications. In particular, numerical analyses of single-bolted connections in PFRP profiles are presented in the paper. To emphasize the general validity of the model and demonstrate its applicability across different configurations, the simulations were validated against experimental results from three separate test campaigns, which varied in both material (three different PFRP composites) and geometry (profile thickness, bolt diameter, and hole–end distance). Finite element models using continuum shell elements in ABAQUS, based on the Hashin failure criteria, successfully captured typical failure modes, including shear-out and pin-bearing. Two analysis approaches—implicit and explicit solvers—were also compared and discussed. Sensitivity analyses were carried out to enhance the model’s accuracy and its computational efficiency. The validated model was then extended to simulate different configurations, investigating the role of the main parameters influencing the connections
Numerical evaluation of the possible moment redistribution in steel-concrete composite beams
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