
Danilo D'AngelaUniversity of Naples Federico II | UNINA · Structures for Engineering and Architecture
Danilo D'Angela
PhD
Assistant professor (RTDA) of structural engineering
About
44
Publications
38,127
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
460
Citations
Introduction
Since 2022, I am an assistant professor of structural engineering at the Department of Structures for Engineering and Architecture, University of Naples Federico II (Italy). My research interests include seismic assessment of reinforced concrete buildings and nonstructural elements (shake table testing and numerical analysis), resilience assessment of healthcare facilities (seismic risk and functional adaptivity), and structural health monitoring of bridges (acoustic emission testing).
Publications
Publications (44)
Half-joints in reinforced concrete girder bridges are generally considered critical elements, susceptible to degradation and potentially impacting the overall structural behavior. An Italian project carried out by ReLUIS interuniversity consortium addresses theoretical, numerical, and experimental studies on critical aspects of existing road bridge...
The structural response of reinforced concrete dapped-end beams is simulated through finite element analysis. The case study consists in experimental tests performed in the framework of an Italian research project on bridges. The study assesses both the local and global behavior of the beam and characterizes the damage patterns. A blind prediction...
The seismic behaviour of nonstructural elements (NEs) is typically extremely critical in terms of seismic risk. As a matter of fact, these elements are often highly vulnerable to dynamic actions and they are associated with high importance/costs, especially for critical and strategic facilities. NEs that are sensitive to the accelerations are often...
Nonstructural elements housed in existing buildings have not been designed or assessed considering seismic actions, except for very few exceptions. In Italy, for example, the current building code, issued in 2018, is the first one clearly recommending the seismic design/assessment of nonstructural elements, whereas, in the previous version, issued...
Past earthquakes highlighted the vulnerability of cleanrooms, especially in earthquake-prone countries like Italy; the post-earthquake reconnaissance showed that damage to cleanrooms led to immeasurable economic losses. This study investigates the seismic performance of an innovative cleanroom, seismically designed and provided with innovative comp...
The paper investigates the seismic response of nonstructural elements (NEs), focusing on acceleration‐sensitive components housed in buildings, modelled as inelastic Ibarra–Medina–Krawinkler (SDOF) systems. Incremental dynamic analysis (IDA) is carried out considering (a) representative suites of building floor motions (real loading histories recor...
Shake table testing represents the best option for assessing and qualifying acceleration-sensitive nonstructural elements (NEs). Several testing protocols are defined in regulations and codes and implemented in the literature, but no commentaries or literature studies provide information regarding the expected reliability or recommend applicative s...
Half joints are very common construction details, often used for precast beams connections or bridge deck supports, since they allow the creation of an effective joint without increasing the height of the nodal region. If not adequately designed, dapped-end beams can show premature shear failure, due to the abrupt variation in the cross-section dim...
The assessment of seismic capacity of acceleration-sensitive nonstructural elements (NEs) is typically carried out through shake table testing, and this is mandatory for seismic qualification purposes. However, current codes and protocols do not provide any information regarding the expected reliability of the protocols, as well as no guidance is p...
Seismic fragility curves represent an advanced tool for assessing seismic capacity of structures according to the performance-based earthquake engineering (PBEE) approach. However, several methods have been defined in the literature, and very few studies provide information regarding the influence of the different methods on the capacity estimation...
Nonstructural elements are typically associated with high seismic risk, regarding functioning interruption, economic losses, and casualties. Architectural elements such as infills and internal partitions are often associated with major construction costs, and, even in case of relatively frequent earthquakes, the post-event repair costs might be cri...
The assessment of the seismic performance of nonstructural elements (NEs) is typically required by the current international codes, regulations, and guidelines. Required response spectra (RRS) and acceleration testing inputs are the key parameters for defining shake table testing protocols suitable for both assessment and qualification of accelerat...
The seismic risk associated with the freestanding elements can be high, especially if they are housed within critical buildings (e.g., hospitals and nuclear plants) or have historical/cultural significance (e.g., museum objects or artifacts). In many cases, these systems exhibit a seismic response governed by rigid motion that is typically critical...
A cleanroom or white room is a constructed facility having a controlled environment in terms of cleanliness, temperature, humidity, and pressure. Cleanrooms are used in various industrial contexts to implement activities that require strictly controlled environment and minimum air contamination. Typical applications refer to food, pharmaceutical, a...
Seismic response and performance of acceleration-sensitive nonstructural elements (NEs) significantly depend on the features of the seismic input. Damage severity of real records cannot always be associated with levels of intensity measures, such as peak ground acceleration or Arias intensity, especially if NEs exhibit complex dynamic behavior. In...
Nonstructural elements (NEs) are typically associated with major seismic risk, as several postevent surveys and literature studies highlighted in the last few decades. NE seismic risk is often expressed in terms of critical functioning disruption, economic losses, and casualties, and this might be significant even in the case of low seismicity site...
A shake table protocol for seismic assessment and qualification of acceleration-sensitive nonstructural elements (NEs) is developed. The paper critically reviews existing protocols and highlights their criticalities, pointing out the need for the development of novel assessment and qualification approaches and protocols. The protocol is developed i...
Nonstructural elements (NEs) are generally defined as elements typically housed within buildings/facilities that are not part of the structural system. Nonstructural elements are often classified as architectural elements, mechanical/electrical/hydraulic systems, and building contents. Nonstructural elements are often associated with critical seism...
The paper presents an extensive assessment of seismic performance of code-conforming single-story precast buildings, with focus on seismic reliability. Single-story RC precast buildings designed according to Italian building code are considered as case studies, varying site seismicity, building geometry layout, and soil type. Nonlinear time history...
The Italian Department of Civil Protection (in Italian: Dipartimento di Protezione Civile, DPC) (https://www.protezionecivile.gov.it/) has been funding major research projects in the field of seismic engineering since 2003 through the consortium ReLUIS (University Laboratories of Seismic and Structural Engineering, in Italian Rete dei Laboratori Un...
In the last few decades, nonstructural elements (NEs) became object of paramount interest for worldwide structural and earthquake engineering researchers. Several observational, experimental, theoretical/analytical, and numerical investigation campaigns were carried out, developing significant knowledge regarding the seismic performance of NEs and...
The paper investigates the fatigue crack growth in typical bridge weldments by means of numerical analysis. The extended finite element (XFEM) method is coupled with the low-cycle fatigue (LCF) approach in ABAQUS, and parametric analyses are carried out in order to assess the influence of the main sample/testing features on the fatigue life of the...
The seismic response of freestanding elements is typically extremely critical, and this is associated with a high seismic risk in the case of museum objects and artefacts. is paper reports the preliminary results of an experimental testing campaign aimed at assessing the dynamic properties and the seismic performance of museum objects and artefacts...
The evaluation of the seismic collapse performance of reinforced concrete (RC) buildings is extremely complex. Several capacity criteria were developed in the literature through different approaches. However , collapse was often assessed only considering single capacity criteria. Moreover, seismic collapse capacity was often assessed in the literat...
This paper reports the results of an extensive campaign of incremental dynamic analyses (IDA) of rigid rocking blocks under various loading histories, including real ground/floor motions and shake table testing protocol loading histories. Several block geometries are investigated considering various size and slenderness combinations representative...
This study investigates the seismic losses associated with the damage of traditional and innovative partitions housed in code-conforming RC frame buildings. Three-story buildings located in low-to-high seismicity sites in Italy are considered. Nonlinear multiple-stripe analyses are performed according to the conditional spectrum approach. The parti...
The paper presents innovative approaches for the simulation of fatigue crack growth (FCG) in metallic compact tension (CT) specimens using finite element (FE) analysis and analytical solution. FE analysis is performed in ABAQUS using the extended finite element method (XFEM) coupled with the direct cyclic low-cycle fatigue (LCF) approach. Novel met...
The paper investigates both local and global capacity criteria for collapse assessment of RC frame buildings. Both literature and regulations criteria are considered, also including the formulation recommended in the draft of the new Eurocode 8 (part 3) and other collapse criteria never investigated. The case studies consist of low-rise bare and in...
The paper presents an extended seismic damage assessment of unanchored nonstructural components by means of rigid block analysis. Both (real) ground and floor motions are considered as loading histories, together with accelerogram inputs developed according to the latest protocols for shake table testing of (acceleration-sensitive) nonstructural co...
Short article published in the Newsletter of the SPONSE (Seismic Performance of Non-Structural Elements) International Association, April 2021 Issue.
The paper addresses the reliability of the existing shake table testing protocols for assessment of the seismic response of freestanding, i.e. unanchored, components meant as rigid blocks; it is assumed that geometric and boundary conditions lead to rocking without sliding. The criticalities of the available assessment methods are primarily identif...
The paper presents an innovative approach for structural health monitoring of metallic components under fatigue crack phenomena. The methodology is based on the evaluation of the information entropy of the acoustic emission (AE) data. AE testing of fatigue crack growth (FCG) is performed on metallic components is performed within an extremely noisy...
The paper presents an innovative approach for the damage assessment of ductile cast irons (DCIs) by using a probabilistic-based methodology. The study is based on the experimental results of acoustic emissions (AEs) tests performed on pearlitic DCIs subjected to both monotonic and fatigue tensile loading. The information entropy of the AEs data is...
Nonstructural components including building contents often represent the main weakness of buildings and facilities under earthquake events. Most of seismic risk related to whole building systems is due to the vulnerability of such components; this is particularly significant for existing buildings and public facilities such as hospitals. A large pa...
The paper presents the preliminary results of Acoustic Emission (AE) tests on a peralitic ductile cast iron (DCI) subjected to fatigue tensile loading. The focus is on the evaluation of the information Entropy of the AE data, as an innovative tool for a reliable assessment of fatigue damage in DCIs. Two damage indexes are proposed for the identific...
The damaging micromechanisms in a pearlitic (EN‐GJS700‐2) ductile cast iron (DCI) are investigated by means of scanning electron microscope (SEM) analysis and acoustic emission (AE) testing. Monotonic uniaxial tensile tests are performed on microtensile specimens under strain control. SEM analysis is applied under in situ conditions by means of a t...
The paper shows the preliminary results of uniaxial tension tests on a pearlitic Ductile Cast Iron (DCI) by using the Acoustic Emission (AE) technique as well as the Scanning Electron Microscope (SEM) analysis. The experimental tests demonstrate the damage initiation and evolution occurring within the graphite nodules produce AE activity. The evalu...
The paper presents the preliminary results of a study on the seismic certification of unanchored acceleration-sensitive components by means of shake table testing. The application of the ICC-ES AC156 protocol for seismic assessment of unanchored blocks is preliminarily reviewed. Numerical rigid block analysis of several component geometries is perf...
The paper presents the results of Acoustic Emission (AE) testing of fatigue fracture initiation and propagation in metal plates. The information Entropy of the AE data (i.e., AE Entropy) is assessed as a fracture-sensitive feature for real-time assessment of metal plates under fatigue loading. Both Shannon and Kullback-Leibler formulations are foun...
The high seismic risk related to the damage of acceleration-sensitive nonstructural components was highlighted by several post-earthquake surveys, and extensively investigated by recent experimental studies. Freestanding (or not-anchored) components are very peculiar acceleration-sensitive elements: (a) they are sensitive to both acceleration and v...
Fatigue is a major issue for critical structures, and it can be very significant for structural systems composed of metal plate-like components. Finite Element (FE) analysis has been proved to be an efficient and reliable simulation tool for damage assessment of plate structures under fatigue. However, this approach is still quite challenging and s...
An experimental investigation of hospital building equipment is presented.
Dynamic properties and seismic performance of typical ambulatory freestanding
cabinets are assessed by unidirectional and bidirectional shake table tests,
also considering the presence of internal partitions and cabinet contents. Vulnerability
analysis is performed according...
The importance of nonstructural components on seismic risk of civil buildings has been known for several years but it is only in recent times that earthquake engineers focused on such elements especially with reference to facilities' contents. Strategic buildings, such as hospitals, require high seismic performance with no-damage to nonstructural c...
Questions
Questions (17)