1,721,016 research outputs found
The Pyramid of Chephren, the Colosseum and the Temples of Angkor: Diagnosis and Safety Evaluation
No full textTorsional Behaviour in Beam and Slab Decks
No full textThe paper deals with the torsional behaviour of bridge composite girders, built with plated I beam and top concrete slab. This typology has different variants in the way transverse bracing (diaphragms) are designed, either strut-and-tie type or flexural, and in the optional presence of a bottom horizontal torsional bracing.
The torsion stiffness for these girders is made of different contribution: a) the “equivalent Bredt” torsion stiffness of the girder cross-section; b) the concrete slab own torsion stiffness; c) the differential bending in both beams and slab (warping). Depending on the cross section bracing arrangement and overall bridge geometry, the importance and the necessity for the three different contributions varies significantly. Curved bridges, also discussed in the paper, poses further questions strictly connected to torsion.
The paper clarifies and compares the different solutions with the support of F.E. analyses and with the direct experience of designing and building few recent examples along Italian motorways and railway lines. The F.E. study shows how to account for the different torsional contributions when simplified grillage types of meshes are used
Causes of the Failures of Colosseum over the Centuries and Evaluation of the Safety Levels
No full textProcedura di calcolo non-lineare al passo per pareti singole e scatole murarie tridimensionali che utilizza elementi finiti riconfigurabili
No full textSeismic Retrofitting for Masonry Historical Buildings: Design Philosophy and Hierarchy of Interventions
No full textThe static and seismic retrofitting design, for masonry historical buildings, has to follow a right hierarchy
of interventions, taking into account that to improve the seismic behavior of a masonry structure, it is
necessary to guarantee a “closed box” behavior for the whole structural body or, in case of complex
buildings, to guarantee a closed box behavior for each building’s wing. Thus it is fundamental to distinguish
the interventions for the global behavior improvement from those related to local reinforcements.
In this chapter is then proposed a scheme of interventions hierarchy and, therefore, a related design
process road-map together with the explanation of a correct design philosophy for the static and seismic
retrofitting of historical masonry buildings. Moreover it is also reported an example of two distinguished
levels of intervention, with numerical analyses supporting that solution
Analyses of a masonry wall subjected to horizontal actions on its plane, employing a non-linear procedure using changing shape finite elements
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