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Papers by Dr. Barbara Charalambidi

Research paper thumbnail of Linear and Nonlinear Earthquake Analysis for Strength Evaluation of Masonry Monument of Neoria

Buildings

An evaluation of the seismic behavior of a massive masonry monument with vaults, namely, the Neor... more An evaluation of the seismic behavior of a massive masonry monument with vaults, namely, the Neoria complex at the old port of Chania, is presented here. The usage of modal response analysis requires the combination of many eigenmodes in order to capture the required amount of vibration energy. Alternatively, a number of earthquakes can be used within a time domain response analysis in order to evaluate the response and, subsequently, the strength of the structure. Results of linear analysis are compared here, since this is what is required from current seismic codes. A nonlinear analysis with adequate material models will also be presented in order to demonstrate a comparison with linear analysis and a prediction of damage appearance under ultimate conditions. From the present investigation, it is shown that the results of the modal analysis and the linear time-step analysis are comparable. Therefore, some confidence is gained towards using the results for the design of strengtheni...

Research paper thumbnail of Structural Health Monitoring of the Fatigue Behavior of FRP Strengthened RC Beams

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)

Research paper thumbnail of Review of Computational Mechanics, Optimization, and Machine Learning Tools for Digital Twins Applied to Infrastructures

Applied sciences, Nov 24, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Linear and Nonlinear Earthquake Analysis for Strength Evaluation of Masonry Monument of Neoria

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Review of Computational Mechanics, Optimization, and Machine Learning Tools for Digital Twins Applied to Infrastructures

Applied Sciences

This review discusses the links between the newly introduced concepts of digital twins and more c... more This review discusses the links between the newly introduced concepts of digital twins and more classical finite element modeling, reduced order models, parametric modeling, inverse analysis, machine learning, and parameter identification. The purpose of this article is to demonstrate that development, as almost always is the case, is based on previously developed tools that are currently exploited since the technological tools for their implementation are available and the needs of their usage appear. This fact has rarely been declared clearly in the available literature. The need for digital twins in infrastructures arises due to the extreme loadings applied on energy-related infrastructure and to the higher importance that fatigue effects have. Digital twins promise to provide reliable and affordable models that accompany the structure throughout its whole lifetime, make fatigue and degradation prediction more reliable, and support effective predictive maintenance schemes.

Research paper thumbnail of Modelling, identification and structural damage investigation of the Neoria monument in Chania

Developments in the Built Environment, 2022

Research paper thumbnail of Challenges on contemporary architectural technology on durability of reinforced concrete structures

International Journal of Structural Integrity, 2020

PurposeThis study aims to discuss the causes of short-lived structuring of contemporary buildings... more PurposeThis study aims to discuss the causes of short-lived structuring of contemporary buildings. The life expectancy of structures may be theoretically predefined during the state of the design. This time period, known as the service life of structures, is determined by the load or the deformation level at which irreversible failures of the bearing structure may occur. On the other hand, planned obsolescence and perceived obsolescence, observed in the western world since the first half of 20th century, are currently setting an economic reality and are part of an expanded framework that, apart from architectural structures, extends to all design fields. The effects of short-lived structuring on environmental and energy terms are presented and theoretical and experimental recommendations from the literature are cited, as well as recommendations that have already been successfully applied in some countries.Design/methodology/approachThis study aims to discuss the issues associated wi...

Research paper thumbnail of Analysis of the fatigue behavior of reinforced concrete beams strengthened in flexure with fiber reinforced polymer laminates

Composites Part B: Engineering, 2016

This paper presents an analytical study on the fatigue response of reinforced concrete beams stre... more This paper presents an analytical study on the fatigue response of reinforced concrete beams strengthened with fiber reinforced polymers (FRP). The study gathers the experimental results from the international literature and from authors' experiments and investigates the critical parameters that affect fatigue performance of reinforced concrete (RC) beams. A new analytical model is proposed for predicting the fatigue life of FRP strengthened RC beams. The parameters used are the maximum stress of tensile steel (σ max) to the yielding strength (f y) ratio, as well as the axial rigidity of longitudinal steel (k s) and FRP (k f) reinforcement. The predictions of the proposed model are compared against the experimental results as well as against the predictions of fatigue models in the literature.

Research paper thumbnail of Fatigue Behavior of Large-Scale Reinforced Concrete Beams Strengthened in Flexure with Fiber-Reinforced Polymer Laminates

Journal of Composites for Construction, 2016

AbstractThe aim of the present research is the experimental investigation of the response of carb... more AbstractThe aim of the present research is the experimental investigation of the response of carbon-fiber-reinforced polymer (CFRP) strengthened reinforced concrete (RC) beams of large scale under fatigue loading. Reinforced concrete beams were cast for this purpose, both with rectangular and T cross-sections, with web dimensions of 200×500 mm and 3,050 mm in length. Beams were strengthened in flexure with externally bonded CFRP laminate [externally bonded reinforcement (EBR)] or with CFRP laminates bonded into slits on the concrete cover surface [near-surface-mounted (NSM)]. Transverse CFRP sheets were placed on the shear spans of the beams to avoid fragile shear failure. All specimens were tested under fatigue loading, with load-unload cycles of 2 Hz frequency. Two different amplitudes of cycles were investigated. The different fatigue life and modes of failures are discussed. Beams subjected to the low loading range, simulating the service loads of a bridge beam, could sustain more than 2 million cycl...

Research paper thumbnail of Finite Element Modeling of Reinforced Concrete Beam-Column Connections

ACI Structural Journal, 2000

Abstract: The application of a nonlinear finite element analysis package to the modeling of exter... more Abstract: The application of a nonlinear finite element analysis package to the modeling of external beam-column connections is investigated. The behavior of the finite element model is compared with the results from 19 experimental tests. A parametric study was ...

Conference Presentations by Dr. Barbara Charalambidi

Research paper thumbnail of BIM without BIM: introducing the BIM logic in architecture technology classes. The case of TUC

While the use of BIM is moving up the ranks into contemporary architecture practice and mainstrea... more While the use of BIM is moving up the ranks into contemporary architecture practice and mainstream building services, there is a lag in the integration of BIM software in the curricula of academic institutions in Greece [1] and worldwide. Although in Greece the most popular BIM software is offered for free as educational versions, its application in the courses is practically zero. The reasons may vary, depending on the institution [2], the result is however that training engineers in BIM logic require additional certified studies. During the architecture studies, there is a constant effort to get acquainted with methods that support the depiction of space on the two-dimensional drawing surface, but also through software modeling. Structural fundamentals, design, and application of materials and technologies that support construction and environmental sustainability are introduced and embodied in architectural design. Through a group project, students were called to design a low-energy residence building. For the perception of space and construction, a scale model of the building was first created, with proper modeling of the different materials and structures introducing an evolving non-software building information modeling. The 2D drawings that followed the analysis highlighted the positive impact of this interactive experience on the accurate design of the structure. This paper presents the concept and the methodology on which the undergraduate course of Architectural Building Technology at the Technical University of Crete was developed, together with the conclusion of the educational procedure, through a feedback delivered by the students via online questionnaire.

Research paper thumbnail of Linear and Nonlinear Earthquake Analysis for Strength Evaluation of Masonry Monument of Neoria

Buildings

An evaluation of the seismic behavior of a massive masonry monument with vaults, namely, the Neor... more An evaluation of the seismic behavior of a massive masonry monument with vaults, namely, the Neoria complex at the old port of Chania, is presented here. The usage of modal response analysis requires the combination of many eigenmodes in order to capture the required amount of vibration energy. Alternatively, a number of earthquakes can be used within a time domain response analysis in order to evaluate the response and, subsequently, the strength of the structure. Results of linear analysis are compared here, since this is what is required from current seismic codes. A nonlinear analysis with adequate material models will also be presented in order to demonstrate a comparison with linear analysis and a prediction of damage appearance under ultimate conditions. From the present investigation, it is shown that the results of the modal analysis and the linear time-step analysis are comparable. Therefore, some confidence is gained towards using the results for the design of strengtheni...

Research paper thumbnail of Structural Health Monitoring of the Fatigue Behavior of FRP Strengthened RC Beams

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)

Research paper thumbnail of Review of Computational Mechanics, Optimization, and Machine Learning Tools for Digital Twins Applied to Infrastructures

Applied sciences, Nov 24, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Linear and Nonlinear Earthquake Analysis for Strength Evaluation of Masonry Monument of Neoria

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Review of Computational Mechanics, Optimization, and Machine Learning Tools for Digital Twins Applied to Infrastructures

Applied Sciences

This review discusses the links between the newly introduced concepts of digital twins and more c... more This review discusses the links between the newly introduced concepts of digital twins and more classical finite element modeling, reduced order models, parametric modeling, inverse analysis, machine learning, and parameter identification. The purpose of this article is to demonstrate that development, as almost always is the case, is based on previously developed tools that are currently exploited since the technological tools for their implementation are available and the needs of their usage appear. This fact has rarely been declared clearly in the available literature. The need for digital twins in infrastructures arises due to the extreme loadings applied on energy-related infrastructure and to the higher importance that fatigue effects have. Digital twins promise to provide reliable and affordable models that accompany the structure throughout its whole lifetime, make fatigue and degradation prediction more reliable, and support effective predictive maintenance schemes.

Research paper thumbnail of Modelling, identification and structural damage investigation of the Neoria monument in Chania

Developments in the Built Environment, 2022

Research paper thumbnail of Challenges on contemporary architectural technology on durability of reinforced concrete structures

International Journal of Structural Integrity, 2020

PurposeThis study aims to discuss the causes of short-lived structuring of contemporary buildings... more PurposeThis study aims to discuss the causes of short-lived structuring of contemporary buildings. The life expectancy of structures may be theoretically predefined during the state of the design. This time period, known as the service life of structures, is determined by the load or the deformation level at which irreversible failures of the bearing structure may occur. On the other hand, planned obsolescence and perceived obsolescence, observed in the western world since the first half of 20th century, are currently setting an economic reality and are part of an expanded framework that, apart from architectural structures, extends to all design fields. The effects of short-lived structuring on environmental and energy terms are presented and theoretical and experimental recommendations from the literature are cited, as well as recommendations that have already been successfully applied in some countries.Design/methodology/approachThis study aims to discuss the issues associated wi...

Research paper thumbnail of Analysis of the fatigue behavior of reinforced concrete beams strengthened in flexure with fiber reinforced polymer laminates

Composites Part B: Engineering, 2016

This paper presents an analytical study on the fatigue response of reinforced concrete beams stre... more This paper presents an analytical study on the fatigue response of reinforced concrete beams strengthened with fiber reinforced polymers (FRP). The study gathers the experimental results from the international literature and from authors' experiments and investigates the critical parameters that affect fatigue performance of reinforced concrete (RC) beams. A new analytical model is proposed for predicting the fatigue life of FRP strengthened RC beams. The parameters used are the maximum stress of tensile steel (σ max) to the yielding strength (f y) ratio, as well as the axial rigidity of longitudinal steel (k s) and FRP (k f) reinforcement. The predictions of the proposed model are compared against the experimental results as well as against the predictions of fatigue models in the literature.

Research paper thumbnail of Fatigue Behavior of Large-Scale Reinforced Concrete Beams Strengthened in Flexure with Fiber-Reinforced Polymer Laminates

Journal of Composites for Construction, 2016

AbstractThe aim of the present research is the experimental investigation of the response of carb... more AbstractThe aim of the present research is the experimental investigation of the response of carbon-fiber-reinforced polymer (CFRP) strengthened reinforced concrete (RC) beams of large scale under fatigue loading. Reinforced concrete beams were cast for this purpose, both with rectangular and T cross-sections, with web dimensions of 200×500 mm and 3,050 mm in length. Beams were strengthened in flexure with externally bonded CFRP laminate [externally bonded reinforcement (EBR)] or with CFRP laminates bonded into slits on the concrete cover surface [near-surface-mounted (NSM)]. Transverse CFRP sheets were placed on the shear spans of the beams to avoid fragile shear failure. All specimens were tested under fatigue loading, with load-unload cycles of 2 Hz frequency. Two different amplitudes of cycles were investigated. The different fatigue life and modes of failures are discussed. Beams subjected to the low loading range, simulating the service loads of a bridge beam, could sustain more than 2 million cycl...

Research paper thumbnail of Finite Element Modeling of Reinforced Concrete Beam-Column Connections

ACI Structural Journal, 2000

Abstract: The application of a nonlinear finite element analysis package to the modeling of exter... more Abstract: The application of a nonlinear finite element analysis package to the modeling of external beam-column connections is investigated. The behavior of the finite element model is compared with the results from 19 experimental tests. A parametric study was ...

Research paper thumbnail of BIM without BIM: introducing the BIM logic in architecture technology classes. The case of TUC

While the use of BIM is moving up the ranks into contemporary architecture practice and mainstrea... more While the use of BIM is moving up the ranks into contemporary architecture practice and mainstream building services, there is a lag in the integration of BIM software in the curricula of academic institutions in Greece [1] and worldwide. Although in Greece the most popular BIM software is offered for free as educational versions, its application in the courses is practically zero. The reasons may vary, depending on the institution [2], the result is however that training engineers in BIM logic require additional certified studies. During the architecture studies, there is a constant effort to get acquainted with methods that support the depiction of space on the two-dimensional drawing surface, but also through software modeling. Structural fundamentals, design, and application of materials and technologies that support construction and environmental sustainability are introduced and embodied in architectural design. Through a group project, students were called to design a low-energy residence building. For the perception of space and construction, a scale model of the building was first created, with proper modeling of the different materials and structures introducing an evolving non-software building information modeling. The 2D drawings that followed the analysis highlighted the positive impact of this interactive experience on the accurate design of the structure. This paper presents the concept and the methodology on which the undergraduate course of Architectural Building Technology at the Technical University of Crete was developed, together with the conclusion of the educational procedure, through a feedback delivered by the students via online questionnaire.