Άρθρα http://hdl.handle.net/11728/7 2026-06-04T08:22:39Z 2026-06-04T08:22:39Z Hu, Shuling Zang, Jinmeng Guo, Tong Chen, Zhi-Peng Karavasilis, Theodoros L. Alam, M. Shahria Kamperidis, Vasileios C. http://hdl.handle.net/11728/13510 2026-05-19T11:13:19Z 2026-09-01T00:00:00Z

Superelastic SMA omega dampers for seismic resilience Hu, Shuling; Zang, Jinmeng; Guo, Tong; Chen, Zhi-Peng; Karavasilis, Theodoros L.; Alam, M. Shahria; Kamperidis, Vasileios C. This paper aims to develop a novel shape memory alloy (SMA) omega damper (denoted as SMA-Ω damper) as a new self-centering component for developing seismic resilient engineering structures. The mechanical behavior and deformation mechanism of the SMA-Ω damper were presented firstly. Experimental studies were subsequently conducted to investigate its hysteretic behavior and failure mode under cyclic loadings. Test results confirmed that the proposed SMA-Ω dampers could achieve reliable self-centering performance with negligible residual deformations under cyclic loadings. Parametric numerical studies were further carried out to understand the strain and stress development in SMA-Ω dampers under cyclic loading and to investigate the influence of design parameters. Parametric analyses revealed that the geometric parameters t, R, r, and d1 governed stiffness, strength, and strain distribution. Larger thickness (t), smaller radii (R, r), and shorter transition lengths (d1) increased stiffness, strength, and energy-dissipation capacity but might induce stress concentration and reduce deformation capacity. Based on the test and numerical results, the design recommendations of SMA-Ω dampers were finally proposed.

2026-09-01T00:00:00Z Vidanalage, Nuwan Padukka Paraskeva, Themelina S Kamperidis, Vasileios C http://hdl.handle.net/11728/13233 2025-09-17T06:51:33Z 2025-01-01T00:00:00Z

Experimental investigation of the embedment strength of laminated veneer lumber (lvl) Vidanalage, Nuwan Padukka; Paraskeva, Themelina S; Kamperidis, Vasileios C Connections in timber structures play a vital role in the stiffness, strength and overall performance of the structure. Embedment properties are of paramount to the overall performance of bolted connections. This study experimentally investigates the performance of embedment strength of LVL manufactured from Nordic Spruce (Picea Abies), utilising 10mm steel dowels. A total of 50 embedment tests were conducted following the half-hole method, as specified in ASTM:D5764−97a. The tests had been performed considering 0°, 45°, and 90° load-to-grain angles, on edgewise orientation of the embedment properties and failure modes were analysed. The experimental embedment strengths were then compared to the respective characteristic embedment strengths proposed in Eurocode 5. While the characteristic embedment strength was 11% lower than the mean embedment strength for load parallel to grain, it overestimated the embedment strength by 9.2% and 7.2% for load-to-grain angles of 45°, and 90°, respectively.

2025-01-01T00:00:00Z Ioannou, Anthos Papamichael, Salomi Bellos, John http://hdl.handle.net/11728/13232 2025-09-12T12:37:31Z 2024-07-01T00:00:00Z

INVESTIGATION OF A COST-EFFICIENT RETROFITTING STRATEGY OF AN EXISTING REINFORCED CONCRETE BUILDING Ioannou, Anthos; Papamichael, Salomi; Bellos, John In the decades of 1950s, 1960s, 1970s, and 1980s most of the buildings in Cyprus, an island in the Mediterranean Sea which is located to a high seismicity region, were designed without seismic design criteria and detailing rules for structural systems ductility, including a lack of supervision and an inadequate quality control of construction works. Most of those buildings are now dealing with a variety of technical issues due to the irregularity in concrete strength, carbonation of the concrete and steel reinforcement and minimal use of transverse and longitudinal reinforcement of the structural elements. Consequently, it is crucial to identify and retrofit the structures that require seismic upgrading. This work presents a case study of an existing reinforced concrete building in Cyprus that was built in the 1980s and had one of its roof floor cantilevers fail. Firstly, this study focuses on identifying critical failures using nonlinear pushover static analysis, and secondly, it investigates different retrofitting strategies and identifies the most practical and cost-effective approach for seismic retrofitting. These approaches include retrofitting with combined infilled walls and concrete jacketing and combined brace-frame systems and steel jacketing for seismic integrity.

2024-07-01T00:00:00Z Ioannou, Anthos Papamichael, Salomi Genikomsou, Aikaterini S Stylianidis, Panagiotis Bellos, John http://hdl.handle.net/11728/13231 2025-09-12T12:26:54Z 2025-06-01T00:00:00Z

SEISMIC ASSESSMENT AND INNOVATIVE STRENGTHENING OF CORRODED CANTILEVER STRUCTURES IN MULTI-STOREY BUILDINGS Ioannou, Anthos; Papamichael, Salomi; Genikomsou, Aikaterini S; Stylianidis, Panagiotis; Bellos, John The research aims to investigate the existing design standards KANEPE (2017) [1] and EN 1998-3 (2005) [2] regarding the seismic assessment of existing reinforced concrete structures through a real case study. Also, the current and applicable design standards together with the available strategies and methodologies for seismic retrofit of existing structures are presented in detail. In addition, the techniques and methods proposed to date for retrofitting reinforced concrete cantilever members such as balconies are analyzed. Through the real example, are presented: the operation of the reference building over the years, its existing conditions and the available architectural and structural engineering studies on the basis of which the build ing was constructed. In addition, the assessment methodology is described using the seismic assessment results of the existing building by identifying the critical structural elements with an advanced degree of damage aiming to explore innovative retrofitting methods, focusing on cantilever structural elements. The novel aspect of the proposed research project distin guishes it from similar studies by using an actual case study of an existing reinforced con crete structure that was constructed in Rush in the 1980s. As a result of aging, the structure's cantilever failed in a brittle manner. With regard to reinforced concrete cantilevers aging is sues make them vulnerable to potential failure and thus the study of their behavior and sug gestion of strengthening techniques are one of the most current engineering issues that structural engineers are requesting solutions for. Through this study, a comprehensive meth odology of structural assessment and recommendation of retrofitting options is carried out

2025-06-01T00:00:00Z