Safety assessment of structures can be obtained employing limit design to overcome uncertainties concerning actual response due to inelastic constitutive behavior and more generally to non-linear structural response and loads’ random variability. The limit analysis is used for evaluating the safety of the structures directly starting from load level without any knowledge of the load history. In the paper, the lower bound calculation is proposed where a new strain-based approach is used that allowed describing the residual stress and displacement in terms of permanent strain. The strategy used the permanent strain as the effective parameters of the procedure so that it was possible to assess the ductility requirements for the complete load program developed till collapse or shakedown. The procedure is compared to experimental results obtained on aluminum beams in shakedown.
Safety assessment of structures can be obtained employing limit design to overcome uncertainties concerning actual response due to inelastic constitutive behavior and more generally to non-linear structural response and loads’ random variability. The limit analysis is used for evaluating the safety of the structures, starting directly from load level without any knowledge of the load history. In the paper, the lower bound calculation is proposed where a new strain-based approach is used that allowed describing the residual stress and displacement in terms of permanent strain. The strategy uses the permanent strain as effective parameters of the procedure so that it is possible to assess the ductility requirements for the complete load program developed till collapse or shakedown. The procedure is compared to experimental results obtained on aluminum beams in shakedown.
Physical model study on wave influences on river-mouth depositional process ispresented. Experiments were performed in a wave basin in order to determine erosionand accretion area due to the combined wave – current flows. An inflow glass channelwas designed to reproduce a river mouth model in a 3D wave basin made with a sandbottom. The tests were carried out under three different conditions: river current,waves, wave –current interaction. Measurements of wave heights, beach profiles andbathymetric profiles were made. The results show that in the presence of combinedwave-current flows, erosion areas are more evident in vicinity of a mouth with depthand width values greater than depth and width values of inflow channel.
It is shown the deformation analysis, in large displacements hypothesis, for two coupled sub-marine pipes rigidly connected and launched at the same time. Hydrodynamic forces on the pipes are referred only to drag component for which the semi-empirical Morison equation is used. For the hydrodynamic coefficients the results of experimental tests, reported in literature are used. The analysis of deformation of the structure under the effects of hydrodynamic loads and axial forces is carried out within the Bernoulli's hypothesis of the conservation of plane cross sections, without any torsional and Von Karman ovalization effect. The equations of the problem were expressed as a function of the slope of the cross section. In order to solve these equations an appropriate numerical model is presented. Finally, some examples are reported in which the use of this method in practical application is shown as well as the advantage of launch of coupled pipes in respect of single ones.
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