Ricerc@Sapienza

The main characteristics of an original bamboo-steel composite truss structure are presented in this work. Specifically, the considered system is a spatial truss structure whose upper chord and diagonal bars are made by glubam elements whereas its lower chord is made by steel members with a hollow cross-section. This novel structural system has been conceived to build roofs and low/mid-span bridges (for example, footbridges), in such a way to ensure easy and rapid construction, efficient use of the constituent materials, low manufacturing costs and good environmental sustainability.

This paper investigates the response of structures including in their constitutive relationship memory effects. The analysis is carried on both by using modal analysis and a wave approach. Memory effects appears by a convolution integral added to conventional differential terms. The dispersion relation for an infinite waveguide is obtained together with the frequency response function for its finite counterpart, with given boundary conditions.

In this paper, the problem of stabilizing linear port-controlled Hamiltonian dynamics through interconnection and damping assignment in presence of input delays is considered. The contribution exploits the reduction approach allowing to reveal and shape the energy properties of the time-delay dynamics. Performances are illustrated on a simple mechanical system.

In this paper, identification of energy dissipation in the joints of a lab-scale structure is accomplished. The identification is carried out by means of an energy flow analysis and experimental data. The devised procedure enables to formulate an energy balance in the vicinity of the joints to obtain local energy dissipation. In this paper, a damping matrix based on the locally identified damping coefficients is formulated. The formulated damping matrix is later used in a five-degrees-of-freedom (5DOF) system for validation.

This note presents the results of constant-volume equivalent-undrained cyclic simple shear tests performed on saturated natural silty soils obtained from two different locations in the Kathmandu valley (Nepal) and characterized by different plasticity. Two simple shear devices were employed: the DSDSS (Double Specimen Cyclic Simple Shear) device and a modified NGI-type DSS device. The above two types of tests complemented each other and jointly covered a wide range of cyclic shear strains amplitudes. Nonlinear soil behavior (i.e.