Dimitra V. Achillopoulou

Dimitra V. Achillopoulou
Democritus University of Thrace | DUTH

Dr, MSc,MEng,Civil Eng.

About

39
Publications
6,315
Reads
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187
Citations
Citations since 2016
23 Research Items
165 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
June 2019 - present
University of Surrey
Position
  • Fellow
Description
  • BriFace-H2020-MSCA-IF-2018: Novel assessment of bridge retrofitting measures through Interface Efficiency Indices (InterFeis) using a Guided Wave-based monitoring method https://cordis.europa.eu/project/rcn/223811/factsheet/en
July 2018 - present
Democritus University of Thrace
Position
  • Professor (Assistant)
Description
  • Research Interests: Diagnosis of Structures using Guided Waves, Interfaces- Shear Transfer Mechanisms, Rehabilitation of Reinforced Concrete Structures using RC jackets/ FRP measures
June 2014 - July 2017
Sapienza University of Rome
Position
  • PostDoc Position

Publications

Publications (39)
Chapter
Superstructures such as reinforced concrete bridges, often suffer from exposure to extreme corrosive environments. The corrosion of the reinforcement leads to a decrease of their capacity and their structural performance needs to be upgraded with strengthening measures. Lately, the use of Fiber Reinforced Polymers (FRP) in retrofitting schemes has...
Conference Paper
Full-text available
Superstructures such as reinforced concrete bridges, often suffer from exposure to extreme corrosive environments. The corrosion of the reinforcement leads to a decrease of their capacity and their structural performance needs to be upgraded with strengthening measures. Lately, the use of Fiber Reinforced Polymers (FRP) in retrofitting schemes has...
Article
This research investigates the design of a transparent pavilion (museum) made entirely of structural glass. The main objective of this research is focused on the seismic behavior and the assessment of the response of the structural glass members in regions with high seismic hazard. The fundamental concepts of structural glass and how they can be us...
Article
Full-text available
Abstract. Unreinforced masonry (URM) walls present low shear strength and are prone to brittle failure when subjected to in plane seismic overloads. This paper discusses the shear strengthening of URM walls with Textile Reinforced Mortar (TRM) jackets. The available literature is thoroughly reviewed and an extended database is developed including a...
Article
Monitoring-enhanced resilience in transport management is an emerging area which has not been fully explored. Digital technologies have the potential to provide rapid resilience assessments in a quantifiable and engineered manner for transport infrastructure, which is exposed to multiple natural and human-induced hazards and diverse loads throughou...
Conference Paper
Full-text available
The exposure of critical transport infrastructure to natural hazards and climate change effects has severe conse-quences on world economies and societies and, thus, safety and resiliency of transport networks are of para-mount importance. The currently available frameworks for quantitative risk and resilience-based design and as-sessment have been...
Conference Paper
Full-text available
Structural Health Monitoring of the deflections of a reinforced concrete bridge deck strengthened with Fibre Reinforced Polymers (FRP) or composite materials can help towards obtaining predictions of failures. Data regarding spam deflection, FRP debondings or failures and concrete crack patterns, acquired by guided waves on interfaces of concrete s...
Article
Full-text available
This work investigates the interaction of shear and Lamb waves with different kinds of defects in plates, in view of applications to defect characterization purposes. Using a finite element model, the reflection and transmission coefficients of shear and Lamb waves are determined, as a function of size parameters of the defect related to its extens...
Article
This study deals with a numerical investigation of load transfer along interfaces of jacketed columns using finite element models. Appropriate plasticity and constitutive models are used to simulate the response of concrete and steel bars. Experimental data were used to calibrate the simulation of mechanical characteristics. The different compressi...
Article
Full-text available
This paper investigates the interaction of different shear- and Rayleigh-Lamb-guided waves in plates with a discontinuity such as a notch or an internal void. The problem was solved numerically using a finite element model and by exploiting an analytical solution obtainable for the double sharp changes of the cross-section that served as a referenc...
Article
The current study focuses on the assessment and interface response of reinforced concrete elements with composite materials (carbon fiber reinforced polymers-CFRPs, glass fiber reinforced polymers-GFRPs, textile reinforced mortars-TRM's, near surface mounted bars-NSMs). A description of the transfer mechanisms from concrete elements to the strength...
Chapter
Interfaces are of crucial importance for design or repair and strengthening, especially in reinforced concrete (RC) elements. In general, interfaces in the case of RC elements are multifactorial. Many phenomena and properties govern the contact laws. Materials and techniques have been studied by many researchers in order to clarify the contribution...
Article
download this paper for free until October 20 http://authors.elsevier.com/a/1Te5j3RA9S8G7J
Article
This paper investigates the interaction of the SH0 mode with discontinuities in plate waveguides. The scattered fields are evaluated using a novel method that exploits the principle of reciprocity in elastodynamics. The results obtained compare to those provided by a finite element model. Very good agreement between the analytical and numerical mod...
Conference Paper
Full-text available
Guided waves play an important role in ultrasonic nondestructive tests for their long-distance inspection capability. Ultrasonic tests are generally performed by sending a single-mode signal (incident wave) along a waveguide and interpreting the scattered response, which often consists of a complex superposition of wave modes. Better knowledge of w...
Article
Full-text available
The current study focuses on the assessment and interface response of reinforced concrete elements with composite materials (carbon fiber reinforced polymers-CFRPs, glass fiber reinforced polymers-GFRPs, textile reinforced mortars-TRM’s, near surface mounted bars-NSMs). A description of the transfer mechanisms from concrete elements to the strength...
Conference Paper
Full-text available
In this work, reflection and transmission of shear waves from discontinuities in a plate waveg- uide are investigated using both analytical and finite element models. The study is motivated by the important role played by guided waves in nondestructive applications, ranging from detection of corrosion or cracks to the evaluation of the state of pre...
Conference Paper
Damage can be viewed as a continuum discontinuity. In order to identify and quan-tify damage, the present study investigates the dependence of reflection and transmission coef-ficients from a discontinuity in a waveguide using a finite element model. A parametric study of a fiber reinforced polymer laminate beam is presented with five different rat...
Conference Paper
Full-text available
Damage can be viewed as a continuum discontinuity. In order to identify and quantify damage, the present study investigates the dependence of reflection and transmission coefficients from a discontinuity in a waveguide using a finite element model. A parametric study of a fiber reinforced polymer laminate beam is presented with five different ratio...
Article
Investigating on initial construction deficiencies of RC elements. Repair with thixotropic fiber reinforced mortar. Proposing a simple evaluation method through indexes. Quantification without any special equipment as in non-destructive tests. A new model is proposed to predict the repaired element's behaviour. a b s t r a c t Following previous re...
Article
Full-text available
Following previous studies, the current paper describes the results of an experimental program concerning the repair of reinforced concrete columns by thixotropic pseudo plastic mortar, preformed to analyze and quantify the influence of initial construction damage to the behavior of the repaired element. Five columns (section scale 1:2) were design...
Article
Full-text available
The study deals with the investigation of the effect of casting deficiencies-both experimentally and analytically on axial yield load or reinforced concrete columns. It includes 6 specimens of square section (150x150x500 mm) of 24.37 MPa nominal concrete strength with 4 longitudinal steel bars of 8 mm (500 MPa nominal strength) with confinement rat...
Article
Full-text available
The study describes the retrofit of repaired elements by reinforced concrete (RC) jacketing conducted to quantify the influence of initial construction deficiencies and of different type of anchors to the ability of the interface to transfer loads. Sixteen specimens (section scale 1:2) were designed with variables the initial deficiencies and the c...
Conference Paper
Full-text available
The current study examines experimentally the interface behaviour of retrofitted columns subjected to pseudoseismic axial loading. It includes 13 specimens of square section (150x150x500 mm) of 24.37 MPa nominal concrete strength with 4 longitudinal steel bars of 8 mm (500 MPa nominal strength) diameter with transverse reinforcement ratio ωc=0.15....
Conference Paper
Full-text available
The paper includes results from an experimental investigation held to understand the effect of the construction damages on the performance of reinforced concrete (RC) columns. It includes 6 specimens of square section (150x150x500 mm) of 24.37 MPa nominal concrete strength with 4 longitudinal steel bars of 8 mm (500 MPa nominal strength) with confi...
Conference Paper
Full-text available
The current study deals with an analytical investigation of the behaviour of the interface of retrofitted concrete columns with RC jackets through FE analysis. Appropriate plasticity and constitutive models are used to simulate the behaviour of both concrete and steel bars. All analytical results are compared with the experimental ones that are sub...
Article
Full-text available
The study presents the results of an experimental program concerning the shear force transfer between reinforced concrete (RC) jackets and existing columns with damages. In order to investigate the effectiveness of the repair method applied and the contribution of e ach shear transfer mechanism of the interface. It includes 22 concrete columns (cor...
Conference Paper
Full-text available
In the current research program the force transfer mechanisms are investigated in retrofitted columns containing bend down welded steel bars. It includes 6 specimens of square section (150x150x500mm) of 24,37 MPa nominal concrete strength with 4 longitudi-nal steel bars of 8mm diameter (500 MPa nominal strength) and different transverse rein-forcem...

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Projects

Projects (2)
Project
Modernisation of our deficient transportation networks and in particular bridges is a pressing requirement imposed by the growing EU economy, vital to societal coherence and safety. Frequent retrofitting solutions include the use of versatile Fiber Reinforced Polymers systems (FRPs), which have been proven to enhance the capacity and deflections of bridges. Nevertheless, it is surprising that only a few, if any, research results are available with regard to the efficiency and appropriateness of FRP systems used on bridge retrofitting schemes, whilst international design guidelines neglect the level of integration of the measures with the existing bridge components. In practice, and especially in bridge decks were deterioration is expected, there is a number of limitations that reduce the level of integration of the FRP system with the bridge. This gave the BriFace project a strong motivation to utilise Structural Health Monitoring (SHM) techniques to assess the efficiency of the strengthening measure and quantify those, for the first time in the international literature, with the Interface Efficiency Indices (InterFeis), by measuring reliably the interface deflections and strains and by taking into account the failure modes and the limit stress states of bridge components. The novel objectives of BriFace are: 1) To define the Interface Efficiency Indices, 2) To utilize an expedient, long-distant inspection method of guided waves for the first time in bridge inspection, 3) To increase the interface efficiency by chemical means potentially by using nanoparticles and 4) To use InterFeis as a reliable indicator toward the quantification of the redundancy of the retrofitted bridge, as a means to assess its capacity and thus its resilience. The research outcomes will also benefit stakeholders and fuel bridge design guidelines and align them with the EU strategy on infrastructural safety and resilience.#H2020; #ResearchImpactEU; #BriFace URL: www.infrastructuresilience.com
Project
1) To define the Interface Efficiency Indices, 2) To utilize an expedient, long-distant inspection method of guided waves for the first time in bridge inspection, 3) To increase the interface efficiency by chemical means potentially by using nanoparticles and 4) To use InterFeis as a reliable indicator toward the quantification of the redundancy of the retrofitted bridge, as a means to assess its capacity and thus its resilience. The research outcomes will also benefit stakeholders and fuel bridge design guidelines and align them with the EU strategy on infrastructural safety and resilience.