Konstantinos Ι. Christidis

Dr. Konstantinos Ι. Christidis

orcid

Research Focus & Metrics

Academic Career Length

4Years (2023-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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2 December 2023 in Applied Sciences
Verified
Journal Article
Open access
PDF file
ITIoulios Tselios
Ioulios Tselios
EVElizabeth Vintzileou
Elizabeth Vintzileou
DKDespina Karagiannaki
Despina Karagiannaki
KCKonstantinos Ι. Christidis
Konstantinos Ι. Christidis
VPVasso Palieraki
Vasso Palieraki
GWGeorg Welz
Georg Welz
This paper presents a part of an extensive experimental campaign performed at the National Technical University of Athens (NTUA) with the purpose of investigating the behavior of chemical anchors embedded in solid brick masonry. Anchors are tested in tension under monotonic or repeated loading. All tests are performed under displacement-controlled conditions. The experimental setup and the instrumentation are presented, along with the investigated parameters and the rationale for the selection of the values of those parameters. In this part of the experimental work, comprising fifty-six (56) tests, the examined parameters are the anchor locations (in mortar joints and in the center of bricks), the state of the substrate (cracked or uncracked), the width of the crack crossing the anchor or at its vicinity (up to 1.20 mm), as well as the loading history (monotonic or repeated). In the tests presented herein, the embedment length of the anchors is equal to 100 mm. The anchors are embedded in solid brick masonry wallettes, and subjected to a normal compressive stress equal to 0.20 MPa. The observed failure modes are explained, and the overall behavior of anchors subjected to tension is presented and commented upon, along with the effect of the investigated parameters on the measured tension resistance, and on the corresponding displacement.

28 June 2025 in CivilEng
Verified
Journal Article
Open access
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KCKonstantinos Ι. Christidis
Konstantinos Ι. Christidis
The present research aims to the evaluation of the deformation capacity of existing reinforced concrete shear walls designed with past non-conforming seismic regulations. A refined analytical model (referred to as the Proposed Model) is presented for generating Load–displacement (P-d) curves for RC shear walls. The model is applicable to medium-rise walls designed with or without modern seismic provisions and incorporates shear effects in both deformation and strength capacity. The application of the Proposed Model is assessed through comparison with numerical models implemented in the widely accepted OpenSees platform. Specifically, two types of elements are examined: the widely used flexural element Force-Based Beam-Column Element (FBE) and the Flexure-Shear Interaction Displacement-Based Beam-Column Element (FSI), which accounts for the interaction between flexure and shear. The results of both analytical and numerical approaches are compared with experimental data from four RC shear wall specimens reported in previous studies.

3 June 2023
Verified
Book Chapter
Closed access
PDF file
KTKonstantinos Tsivolas
Konstantinos Tsivolas
KCKonstantinos Ι. Christidis
Konstantinos Ι. Christidis
GPGeorge Papantonopoulos
George Papantonopoulos
PSPaweł Studziński
Paweł Studziński
JŻJuliusz Żach
Juliusz Żach
Efstratios BadogiannisEfstratios Badogiannis
Efstratios Badogiannis