Masonry arch systems and vaulted structures constitute a structural typology widely spread in the historical building heritage. Small displacements of the supports, due to different causes, among which subsidence of foundation systems or movements of underlying structures can lead the masonry arch to a condition of collapse because of gradual change in its geometry. This paper presents a tool, based on a kinematic approach, for the computation of the magnitude of the displacements that cause the collapse of circular arches subject to dead loads, and allows the evaluation of the related thrust value. A parametric study has been carried out in order to develop a deeper understanding of the influence of the involved parameters. In addition, analytic formulations of the maximum allowed displacement and the associated thrust are proposed. Finally, a case study related to the behavior of a masonry arch on spreading-induced abutments is undertaken and discussed.
The corrosion, main cause of degradation in RC structures in non-exceptional conditions, can have also significant effects on the seismic behaviour, leading to dangerous strain localizations and variations of strength distribution and rotation capacity. In this paper, the behaviour of corroded columns under cyclic loads is studied with a three-dimensional Finite Element Analysis, accounting for steel and interface decay and including buckling effects. The model is validated through a comparison with the results of experimental tests developed at the Bergamo University. Finally, a parametric survey is carried out to highlight the main parameters governing the global response
A procedure for the design of precast tunnel segments for mechanical excavated tunnel lining in fiber reinforced concrete, without any traditional steel reinforcement, is presented herein. Both assisted by test procedure for particular loading situation is also proposed. Finally, a case study related to a precast steel fiber reinforced concrete segment is analysed in order to clarify the procedure and to show practically how to define the actions and to evaluate the interaction envelopes.
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