Giuseppe Balduzzi

University of Pavia | UNIPV · Department of Civil Engineering and Architecture

When dealing with timber structures, the characteristic strength and stiffness of the material are made highly variable and uncertain by the unavoidable, yet hardly predictable, presence of knots and other defects. In this work we apply the sparse grids stochastic collocation method to perform uncertainty quantification for structural engineering i...

Nanoindentation, laser ablation inductively coupled plasma mass spectroscopy and weighing ion-spiked organic matrix standards revealed structure-property relations in the microscopic jaw structures of a cosmopolitan bristle worm, Platynereis dumerilii . Hardness and elasticity values in the jaws’ tip region, exceeding those in the center region, ca...

Background Testing standards prescribe dog-bone samples for the determination of clear-wood longitudinal tensile strength. However, the literature reports a high number of invalid tests due to the unexpected failure of the sample outside the gauge length. Motivation The paper aims at understanding the reason for the premature failure of dog-bone s...

Non-prismatic beams are widely employed in strategic structures like bridges and sport arenas, requiring accurate analyses for a reliable and effective design. Unfortunately, features of non-prismatic beams lead their modeling to be a non-trivial task: (i) variations of both cross-section area and second moment of area impede an easy computation of...

ISBN: 978-802610876-4 https://www.scopus.com/record/display.uri?eid=2-s2.0-85090751146&origin=resultslist

ISBN: 978-802610876-4 https://www.scopus.com/record/display.uri?eid=2-s2.0-85090717195&origin=resultslist

In this work we analyze the non-trivial influence of material anisotropy on the structural behavior of a multi-layer planar beam. Indeed, analytical results available in literature are limited to homogeneous beams and several aspects have not been addressed yet, preventing a deep understanding of the mechanical response of anisotropic structural el...

This paper analyzes the non-trivial influence of the material anisotropy on the structural behavior of an anisotropic multilayer planar beam. Indeed, analytical results available in literature are limited to homogeneous beams and several aspects has not been addressed yet, impeding an in-depth understanding of the mechanical response of anisotropic...

In this paper, the influence of torsional warping of thin-walled cross-sections of twisted Functionally Graded Material (FGM) beams with a longitudinal polynomial variation of the material properties on their eigenvibrations is investigated, considering the secondary deformations due to the angle of twist. The transfer relations needed for the tran...

This paper aims at estimating the stiffness of Glued Laminate Timber (GLT) beams on the basis of an accurate analysis of the board's mechanical properties and a simple composite beam theory. Modern grading technologies, like laser scanning, have the capability to accurately detect grain orientation on the surface of timber boards, allowing for an a...

This paper aims at proposing a Timoshenko-like model for planar multilayer (i.e., non-homogeneous) non-prismatic beams. The main peculiarity of multilayer non-prismatic beams is a non-trivial stress distribution within the cross-section that, therefore, needs a more careful treatment. In greater detail, the axial stress distribution is similar to t...

This paper highlights several issues of the procedures nowadays adopted for the recovery of cross-sections stress distribution within tapered thin-walled I beams. In particular, deficiencies are evident even considering bi-symmetric structural elements behaving under the assumption of plane stress. In fact, analytical results available in the liter...

This work aims at highlighting critical issues that occurs in the modeling of mono-symmetric non-prismatic thin walled beams. In particular, even considering the simplified assumption of planar behavior, it is possible to demonstrate that the shear stress distribution within non-prismatic beams is substantially different from the one that occurs in...

In this paper, the influence of the variable axial force and of the Secondary Torsion-Moment Deformation-Effect (STMDE) on the deformations of beams due to torsional warping is investigated. The investigation is based on the second-order torsional warping theory of doubly symmetric beams with thin-walled open or closed cross-sections. The effect of...

This contribution aims at proposing an effective First order Shear Deformation Theory (FSDT) capable to tackle the non-trivial effects that a continuous variation of the mechanical properties induces on stresses, displacement, and stiffness distributions within a planar beam made of Functionally Graded Material (FGM). In greater detail, the beam mo...

The present paper combines an effective beam theory with a simple and accurate numerical technique opening the door to the prediction of the structural behavior of planar beams characterized by a continuous variation of the cross-section geometry, that in general deeply influences the stress distribution and, therefore, leads to non-trivial constit...

This paper provides innovative and effective instruments for the simplified analysis of serviceability limit states for pitched, kinked, and tapered GLT beams. Specifically, formulas for the evaluation of maximal horizontal and vertical displacements are derived from a recently-proposed Timoshenko-like non-prismatic beam model. Thereafter, the pape...

The authors of this contribution have recently proposed new straightforward formulas for the serviceability analysis of non-prismatic timber beams, limiting the validation to pitched, tapered, and kinked beams. The comparison between the new formulas, the ones available in the literature, and highly refined 2D Finite Element analysis have revealed...

The present paper discusses simple compatibility, equilibrium, and constitutive equations for a non-prismatic planar beam. Specifically, the proposed model is based on standard Timoshenko kinematics (i.e., planar cross-section remain planar in consequence of a deformation, but can rotate with respect to the beam center-line). An initial discussion...

This paper presents an analytical model for the study of 2D linear-elastic non-prismatic beams. Its principal aim is to accurately predict both displacements and stresses using a simple procedure and few unknown variables. The approach adopted for the model derivation is the so-called dimensional reduction starting from the Hellinger–Reissner funct...

The present paper considers a non-prismatic beam i.e., a beam with a cross-section varying along the beam axis. In particular, we derive and discuss a model of a 2D linear-elastic non-prismatic beam and the corresponding finite element. To derive the beam model, we use the so-called dimensional reduction approach: from a suitable weak formulation o...

This paper illustrates an innovative approach to obtain an analytical model for elastic, multilayer, anisotropic, and moderately thick plates. The goals of the proposed approach are (i) provide an accurate stress description, (ii) take into account the effects of material anisotropies and inhomogeneities, and (iii) lead to a plate model that does n...

In this work a methodology for the numerical analysis of landslides is presented, showing the case history of Rosone Landslide (Western Alps). This is one of the most studied and monitored landslides in the Alps The type of modeling and the parameters to insert into a model are discussed and compared with other modelling proposed in the literature....

This paper illustrates an application of the so-called dimensional reduction modelling approach to obtain a mixed, 3D, linear, elastic beam-model. We start from the 3D linear elastic problem, formulated through the Hellinger-Reissner functional, then we introduce a cross-section piecewise-polynomial approximation, and finally we integrate within th...

This article illustrates an application of the so-called dimensional reduction modelling approach, used to obtain some, linear, elastic beam-models starting from the 3D linear elastic problem. Later, the approximated solutions of the beam-models are obtained trough a finite element discretisation procedure. The goal of the whole procedure is to obt...

In this document we illustrate the dimensional-reduction approach applied to 3D solid elastic equations in order to obtain a beam model. We start from the Hellinger-Reissner (HR) principle, in a formulation which guarantees the selection of a compatible solution in a family of equilibrated fields. Then, we introduce a semidiscretization within the...

This paper illustrates a new modeling approach for planar linear elastic beams. Referring to existing models, we first introduce the variational principles that could be adopted for the beam model derivation, discussing their relative advantages and disadvantages. Then, starting from the Hellinger-Reissner functional we derive some homogeneous and...