1,721,076 research outputs found
Developing Fragility Curves and Loss Functions for Masonry Infill Walls
No full textThe primary objective of this study is to summarize results from previous experimental tests on laboratory specimens of RC/steel frames with masonry infills, in order to develop fragility functions that permit the estimation of damage in typical non-structural components of RC frame buildings, as a function of attained peak interstory drift. The secondary objective is to derive loss functions for such non-structural components, which provide information on the probability of experiencing a certain level of monetary loss when a given damage state is attained. Fragility curves and loss function developed in this study can be directly used within the FEMA P-58 framework for the seismic performance assessment of RC frame buildings with masonry infills
Sviluppo di modelli interpretativi/predittivi del comportamento dei ponti in funzione delle loro caratteristiche strutturali e dell'ambiente, con particolare riguardo alle problematiche sismiche
No full textCritical load of slender elastomeric seismic isolators: an experimental perspective
No full textOne of the most important aspects of the seismic response of elastomeric isolators is their stability under large shear strains. The bearing capacity of elastomeric isolators, indeed, progressively degrades while increasing horizontal displacement. This may greatly influence the design of elastomeric isolators, especially in high seismicity regions, where slender elastomeric isolators subjected to large horizontal displacements are a common practice. In the current design approach the critical load is evaluated based on the Haringx theory, modified to account for large shear strains by approximate correction factors.
In this paper the critical behavior of a pair of slender elastomeric devices is experimentally evaluated at different strain amplitudes, ranging from approximately 50% to 150%. The experimental results are then compared to the predictions of a number of semi-empirical and theoretical formulations.
The main conclusion of this study is that current design approaches are overly conservative for slender elastomeric seismic isolators, since they underestimate their critical load capacity at moderate-to-large shear strain amplitudes
Damage and loss assessment of pre-70 RC frame buildings with FEMA P-58
No full textPast earthquakes have shown that seismic events may incur large economic losses in buildings. FEMA P-58 provides engineers a practical tool for the performance seismic assessment of buildings. In this article, FEMA P-58 is applied to a typical Italian pre-1970 reinforced concrete frame building, characterized by plain rebars as steel reinforcement and masonry infills and partitions. Given that suitable tools for these buildings are missing in FEMA P-58, in the first part of the article, specific fragility curves and loss functions for the main structural and non-structural components of the building type under consideration are proposed. In the second part, building performance is evaluated following a time-based assessment approach. Expected economic losses in form of repair costs are then derived.
Finally, results are compared with those from past applications to old RC frame buildings
COMPORTAMENTO CRITICO E POST-CRITICO DI ISOLATORI ELASTOMERICI: FORMULAZIONI TEORICHE ED ANALISI NUMERICHE
No full textUn modello non lineare di trave con warping non uniforme da taglio per l’analisi di isolatori elastomerici
No full textIl lavoro sviluppa un modello nonlineare di trave piana che include gli effetti di warping non uniforme da taglio. Il modello `e prima rappresentato localmente nei termini di una classica teoria del I ordine e successivamente collocato in un corretto contesto nonlineare nel quadro del metodo corotazionale implicito e sulla base di una approssimazione asintotitica quadratica del tensore della deformazione di Biot. Con riferimento all’analisi critica e post-critica degli isolatori elastomerici SLFREI, sono fornite le espressioni delle variazioni successive dell’energia di deformazione
Cost-benefit analysis of alternative retrofit strategies for RC frame buildings
No full textMonetary losses induced by earthquakes in Reinforced Concrete (RC) buildings are mainly due to damage to non-structural elements (infills, partitions, finishes, etc.). In this study, alternative retrofit strategies for reducing monetary losses in RC frame buildings are examined. They include local strengthening of infills (and partitions) and seismic isolation. The Expected Annual Loss (EAL) of a number of RC frame buildings, pre- and post- rehabilitation, is evaluated, following the time-based assessment approach proposed in the FEMA P-58 guidelines. The break-even time of each retrofit intervention is then computed, considering the initial cost of the intervention and the expected benefit in terms of EAL reduction
Generative Adversarial Models for Vehicular Dynamics Prediction in V2X Networks
Full text linkReal-time trajectory prediction is critical for safe and efficient operation of connected and autonomous vehicles (CAVs). Yet existing deterministic models struggle to capture the multi-modal, uncertain nature of traffic evolution. This paper addresses this gap by proposing a framework powered by Generative Adversarial Networks (GANs) that uses V2X (Vehicle To Everything) data to create a digital twin capable of simulating plausible future scenarios and of supporting planning and decision-making in CAVs. The Generative framework is designed to generate multiple trajectory predictions conditioned on received CAM (Cooperative Awareness Message) data, using a Transformer-based architecture with temporal consistency regularization. We evaluate it in a SUMO-simulated environment, demonstrating improved stability and realism over baseline GAN training
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