A5070100846- Structural Health Monitoring Techniques
- Seismic Performance and Analysis
- Masonry and Concrete Structural Analysis
- Structural Engineering and Vibration Analysis
- Ultrasonics and Acoustic Wave Propagation
- Structural Analysis of Composite Materials
- Non-Destructive Testing Techniques
- Metal Forming Simulation Techniques
- High-Velocity Impact and Material Behavior
- Structural Response to Dynamic Loads
- Vibration Control and Rheological Fluids
- Concrete Corrosion and Durability
- Structural Analysis and Optimization
- Landslides and related hazards
- Fish Ecology and Management Studies
- Geotechnical and Geomechanical Engineering
- Numerical methods in engineering
- Transportation Planning and Optimization
- Traffic control and management
- Innovations in Concrete and Construction Materials
- Seismic Imaging and Inversion Techniques
- Ichthyology and Marine Biology
- Fire effects on concrete materials
- Metallurgy and Material Forming
- Wood Treatment and Properties
University of Cagliari
2013-2024
Sapienza University of Rome
2020
Many of the steel bridge collapses occur in truss-type bridges. This is, fact, focus this study involving an assessment robustness type structures based on actual that authors had extensively monitored and controlled. Robustness was assessed by means computer simulations various Damage Scenarios (DSs) to analyse structural capacity efficiently activate Alternative Load Paths (ALPs). The computational models have been previously validated with results load tests a laboratory test full-scale...
Post-copulatory sexual selection, and sperm competition in particular, is a powerful selective force shaping the evolution of morphology. Although mounting evidence suggests that post-copulatory selection influences morphology among species, recent also variation at intraspecific level. However, contradictory empirical results limited taxonomic scope have led to difficulty assessing generality morphological responses strength competition. Here, we use phylogenetically controlled analyses...
Here, a 12-liter tubular microbial electrolysis cell (MEC) was developed as post treatment unit for simultaneous biogas upgrading and ammonium recovery from the liquid effluent of an anaerobic digestion process. The MEC configuration adopted cation exchange membrane to separate inner anodic chamber external cathodic chamber, which were filled with graphite granules. performed CO
The Mediterranean Sea has a long-lasting history of fishery exploitation that, together with other anthropogenic impacts, led to declines in several marine organisms. In particular, elasmobranch populations have been severely impacted, drastic decreases abundance and species diversity. Based on their experience, fishers can provide information occurrence, behavioural traits long-term scale, therefore contributing research the poorly studied biological aspects elusive or rare species. this...
We present a detailed survey on the ongoing destabilization process of Mosul dam. The dam is located Tigris river and biggest hydraulic structure in Iraq. From geological point view foundation unstable due to underlying geology that formed by alternate variable strata highly soluble materials such as gypsum, anhydrite, marl limestone. Here we first comprehensive multi-sensor cumulative deformation map for generated from space-based synthetic aperture radar (SAR) measurements Italian...
This paper concerns the experimental analysis of nonlinear response features a composite laminate plate for impact damage detection. The measurement procedure is based on Scaling Subtraction Method (SSM) and consists in exciting damaged specimen with two sinusoidal signals at different amplitude. linearly rescaled signal low amplitude excitation subtracted from large to extract signatures. latter are analysed time domain infer presence damage. Results compared frequency analyses using...
Although still little used in practice, the non-linear time-history (NlTH) analysis is most powerful method to design new earthquake-resistant buildings.This kind of may even help designer assess seismic performance existing buildings and suitably plan their retrofit.With reference a pre-seismic-code r/c building suite Italian spectrum-consistent earthquakes, paper highlights advantages adopting NlTH analyses evidence critical features response advance effectiveness retrofit strategy.To this...
The aim of this paper is to investigate whether metal-foam-made devices can be effective dissipate seismic energy in buildings during strong earthquakes. To purpose, non-linear numerical analyses concentrically braced steel under recorded ground motions have been carried out, while some experimental tests on metal-foam specimens and metal-foam-filled tubes performed. Foam-based are assumed inserted within the diagonal braces considered frame by plastic deformation apply data, a scaled model...
Very sensitive structural health monitoring methods are needed to detect barely visible impact damage in composite materials. Based on extracting non-linear modulated components from the frequency response of damaged system, vibro-acoustic modulation (VAM) has shown be effective identifying presence at its early stage. A decisive role success this technique is played by choice high-frequency probe and low-frequency pump sinusoidal signals that simultaneously excites system. This study...
Composite materials have been widely used in many advanced engineering structures, because of their high strength and good resistance to fatigue corrosion. Nevertheless, susceptibility impact damage is one the biggest concerns for use critical load-bearing structures. Over last few decades, non-destructive techniques based on analysis nonlinear vibrations other acoustic phenomena developed. Among them, Scaling Subtraction Method (SSM) an approach extract features acquired signal generated by...
Post-seismic reinforcement is extensively used to repair structural elements of buildings hit by strong earthquakes, while pre-seismic can be very convenient improve the seismic performance designed according less stringent standards than current. One most commonly techniques for both pre and post-seismic retrofit structures that wrapping previously identified as weak or damaged with sheets fiber-reinforced polymers (FRP). This technique may in fact more advantageous other strengthening...
The Incremental Dynamic Analysis (IDA) assesses the global collapse capacity of a structure by plotting its maximum inelastic response, obtained through non-linear time-history analysis, versus scaled intensity different input earthquakes. seismic is often measured spectral acceleration at fundamental elastic period. However, this can produce highly variable results. An alternative method presented in paper that relies on elongated period, calculated either from Fourier spectrum target...
Structural failure prevention is a crucial issue in civil engineering. The causes of structure or infrastructure collapse include phenomena that slowly deform the ground and could affect stability foundations such as differential settlements, subsidence, groundwater changes, slope failure, landslides. When large urban areas need to be monitored, are hard mapped by means classical structural health monitoring methods due unaffordable quantity situ measurements these would entail. A very...
Due to their excellent seismic behavior, shear wall-type concrete buildings are very popular in earthquake-prone countries like Chile. According current regulations, the performance of such structures can be indifferently assessed through linear or non-linear methods analysis. Although all code-compliant approaches supposedly lead a safe design, may fact less precise for catching actual ductile and dissipative structures, which even result unconservative design where comparatively stiff...
The paper shows that the rigid–plastic oscillator can be used to evaluate maximum plastic displacement of any elastic–plastic under earthquake. Motivated by this result a response spectrum is introduced, which provides an easy method calculate for given Such easier construct than or classical elastic one. By means appropriate formulas presented in paper, determine realistic upper bound Copyright © 2001 John Wiley & Sons, Ltd.
To detect the presence of damage, many structural health monitoring techniques exploit nonlinear features that typically affect otherwise linear dynamic response components with internal defects. One them is Scaling Subtraction Method (SSM), which evaluates to a high-amplitude harmonic excitation by subtracting scaled reference signal. Originally tested on granular materials, SSM was shown be effective for composite materials as well. However, dependence technique efficiency testing...
Despite being the more accurate method to design earthquake-resistant buildings, non-linear dynamic analysis still remains least used in practice.The paper shows that some code inadequacies may even contribute ward off designer from this kind of seismic analysis.To purpose, analyses under different sets spectrum-compatible earthquakes and by considering two distinct plastic-hinge models were carried out for a multistory reinforced concrete (r/c) frame designed according Eurocode 8...
Abstract In the past few decades, need for efficient and reliable Structural Health Monitoring strategies has led to development of several approaches damage detection characterization purposes. Among them, Nonlinear Vibro-Acoustic Modulation (VAM) exploits modulation arising from interaction two concurrently applied driving waves, namely probe pump excitations, in presence nonlinear scatters such as cracks defects. Therefore, VAM provides information on emergence internal by extracting...
An effective seismic design entails many issues related to the capacity-based assessment of non-linear structural response under strong earthquakes. While very powerful calculation programs are available assist designer in code-based analysis, an optimal choice parameters leading best performance at lowest cost is not always assured. The present paper proposes a procedure cost-effectively earthquake-resistant buildings, which based on inversion artificial neural network and optimization...