Papers by Author: Giorgio Monti

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Authors: Martina Mancini, Simona Caruso, Zhi Li, Roberto Marnetto, Giorgio Monti
Abstract: This paper presents an experimental work about the design of a truss roof for a long-spanbuilding. This study makes use of an innovative hybrid truss that has been developed in a parallelstudy. The project presented herein shows the direct application of the technology on an existingbuilding, emphasizing its feasibility, potentiality and functionality. The paper highlights thecharacteristic of adaptability to both newly designed buildings and existing ones. Starting from thetruss prototype, different shape configurations that the technology allows are hypothesized. Thefinal roof shape is selected based on study aiming at optimizing the elements sections.
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Authors: Raffaello Bartelletti, Gabriele Fiorentino, Giuseppe Lanzo, Davide Lavorato, Giuseppe Carlo Marano, Giorgio Monti, Camillo Nuti, Giuseppe Quaranta, Nunziante Squeglia
Abstract: Understanding the structural behavior of heritage buildings is usually a very complicated task because they typically present complex deterioration and damage patterns which cannot be fully evaluated by means of visual inspections. Moreover, the reliability of such constructions largely depends on different materials, structural components and details, the health of which is often unknown or affected by great uncertainties. In this regard, the experimental dynamic testing of heritage buildings and monuments subjected to ambient vibrations has become a valuable tool for their assessment because of the minimum interference with the structure. Traffic-induced vibrations are not always a feasible dynamic load for monumental buildings due to their very low intensity or owing to existing restrictions to road and rail traffic. On the other hand, the analysis of the experimental response under earthquakes can lead to more relevant information about the dynamic behavior of historic constructions, provided that the structure is equipped with a permanent sensor network. Within this framework, the present work illustrates preliminary results carried out from time and frequency domain analyses performed on the experimental dynamic response of the leaning tower of Pisa using seismic records. The main dynamic features of the monument have been identified, and then examined taking into account the seismic input and the soil-foundation-structure interaction.
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Authors: Raffaello Bartelletti, Gabriele Fiorentino, Giuseppe Lanzo, Davide Lavorato, Giuseppe Carlo Marano, Giorgio Monti, Camillo Nuti, Giuseppe Quaranta, Fabio Sabetta, Nunziante Squeglia
Abstract: The most recent studies about the seismic behavior of the leaning Tower of Pisa that consider the soil-foundation-structure interaction date back to twenty years ago. From 1999 to 2001, the foundation of the monument was consolidated by means of under-excavation and the "Catino" at the basement was rigidly connected to the foundation. Meanwhile, significant progresses have been made in the field of earthquake engineering. Therefore, the need exists to assess the dynamic behavior of the Tower in light of the novelties occurred in the past decades. In the present study, the mechanical characteristics of the foundation have been calibrated comparing the outcomes of the experimental dynamic monitoring with the results of the finite element analysis performed on a simple but effective model. The scenario earthquakes for return periods equal to 130 years and 500 years are also presented.
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Authors: Muhammad Ajmal Kareemi, Floriana Petrone, Giorgio Monti
Abstract: This paper reports the results of an experimental campaign conducted on a set of eight composite beams made of prefabricated steel trusses encased in structural concrete. The test setup is organized in such a way to apply an evenly distributed load on the beam, so to simulate the actual loading condition in real buildings. This is also to avoid the formation of peculiar and unusual shear resisting mechanisms occurring in three or four-point bending tests. The experimental results are presented in terms of force-displacement graphs and also in terms of stress-strain diagrams in the steel members. The outcome of this study highlights that Composite Truss Beams (CTBs) have an effective performance in the shear resisting mechanism, showing a capacity higher than that estimated through the current capacity equations given by Codes.
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Authors: Simona Caruso, Rui Wang, Zhi Li, Roberto Marnetto, Giorgio Monti
Abstract: This paper presents an innovative technology in the field of truss structures, which is based on an innovative concept of mixing two different types of materials and joining them with a newly conceived connection, able to carry high loads with a small size. After an initial feasibility study aimed at pursuing the realization of sustainable and green structures, the project of the hybrid space truss was finally developed. Here, hybridization is the keyword, that is, making use of two different building materials, steel and wood, to achieve lighter roofs through a specialization of their functions and an optimization of their mechanical properties. Another key point is modularity, which is an important aspect that allows easy and fast assembly of structures and, most of all, standardization of parts. The trusses have been designed in detail, with special attention to the connections, and have been built and tested at the Laboratories of the Hunan University at Changsha (China). In a typical process of “designing by experimenting”, the prototypes have been produced and the assembly process has been tested in order to confirm the feasibility of the whole process, from production to construction to ultimate performance conditions.
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Authors: Zhi Li, Yan Xiao, Giorgio Monti, Rui Wang
Abstract: A new type of hybrid wood-bamboo shear wall was studied. Ply-bamboo is used as the sheathing panel for conventional two-by-four lightweight woodframe shear walls herein. Two different nails were adopted for the ease constructability and used for constructing the shear walls, as follows: gun-driven T shape nail and 6d common nail. Monotonic and cyclic test results of sheathing-frame connectors and corresponding full scare shear walls were also reported. The results obtained from the research reported in this paper indicated that ply-bamboo panels can be used as sheathings for light-weight timber shear walls.
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Authors: Marco Vailati, Giorgio Monti, Giorgia di Gangi
Abstract: Infill panels and partitions are widely used non-structural elements in reinforced concrete buildings, characterized by a significant seismic vulnerability as testified by disastrous collapses observed during recent earthquakes, for both in-plane and out-of-plane actions. The most advanced building codes foresee mandatory verifications of these elements, both when designing a new building and when assessing the seismic adequacy of an existing one. Moreover, recent evaluations have shown that, after low-intensity earthquakes, damage of non-structural parts strongly influences repair costs for typical multi-storey buildings. In this paper, an innovative concept for infill panels and partitions is presented, in which (either concrete or clay) blocks are connected, rather than with the usual mortar layers, by means of recycled-plastic joints. A comparison is also carried out with respect to conventional infill typologies, by evaluating their performance in terms of energy efficiency and acoustic. A brief description of seismic performances of innovative infill panels are shown at the end of work.
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Authors: Bharat Mandal, Vincenzo Bianco, Giorgio Monti
Abstract: Pounding-induced damage to structures, either buildings or bridges, is systematically observed after significant earthquakes. This has emphasized the necessity of accounting for this phenomenon either in the design of new bridges or the seismic assessment of existing bridges. For this reason, practitioners concerned with bridge structures should be provided with concise computational tools to correctly quantify the effects due to pounding. One such tool is represented by pounding spectra, which were already introduced a couple of decades ago. This work presents a proposal of simplified equations for pounding-related displacement spectra. The first part of this paper presents the computational aspects arising when modeling such complex phenomenon. The second part presents the results of numerical analyses, in terms of displacement spectra. The third part presents a set of simple expressions to allow practitioners easily evaluate pounding-related effects in terms of displacement amplification with respect to the no-pounding condition.
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Authors: Marco Vailati, Giorgio Monti, Giorgia di Gangi
Abstract: A building context as complex as that of many historical centers in Europe is the typical scenario where more and more technicians found themselves at work. In addition to the usual difficulty of dealing with the complexity of masonry building clusters, they particularly feel the lack of the essential support of dedicated computational tools. In fact, the calculation codes currently available do not address modeling and analysis of building clusters in a personalized manner. VENUS, Italian acronym for Nonlinear Assessment of Structural Units, is a software developed in C++, which deals with the seismic assessment of building clusters in an integrated manner, accompanying the practitioner from the early stages of defining the level of knowledge, to the management of the design quantities, until the graphic elaboration of the results. Finally, it allows to test the effectiveness of a local intervention with traditional and innovative strengthening techniques and to evaluate its effects on the global response. Finally, a brief description of a stochastic approach foreseen in a future version of the software is discussed.
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Authors: Giorgio Monti, Giuseppe Quaranta, Giuseppe C. Marano
Abstract: Significant advances in the development and customization of various sophisticated technologies for structural monitoring have emerged during the last decade. Technologies for instrumentation, monitoring, load testing, non-destructive evaluation and/or characterization, three-dimensional finite element modeling and various types of analyses have now become available at a reasonable cost. Within this framework, the paper focuses the issues addressed in designing a sensors network for dynamic monitoring of a historic swing bridge in Taranto (Italy).
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