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RISS 인기검색어
- 검색키워드
- 저자 : Papastergiou, Panos (검색결과 3 건)
- 무료
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Investigation of a new steel-concrete connection for composite bridges
Dimitrios Papastergiou,Jean-Paul Lebet 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.17 No.5
A new type of connection for steel-concrete composite bridges was developed by the Steel Structures Laboratory of Ecole Poytechinque Fédérale de Lausanne. Resistance to longitudinal shear is based on the development of shear stresses in the confined interfaces which form the connection. Confinement is provided by the reinforced concrete slab which encloses the connection and restrains the uplift (lateral separation) of the interfaces by developing normal stresses. The experimental investigation of the interfaces, under static and cyclic loading, enabled the development of the laws describing the structural behaviour of each interface. Those laws were presented by the authors in previous papers. The current paper focuses on the continuity of the research. It presents the experimental investigation on the new connection by means of push-out tests on specimens submitted to static and cyclic shear loading. Investigation revealed that the damage in the connection, due to cyclic loading, is expressed by the accumulation of a residual slip. A safe fatigue failure criterion is proposed for the connection which enabled the verification of the connection for the fatigue limit state with respect to the limit of fatigue. A numerical model is developed which takes into account the laws describing the interface behaviour and the analytical expressions for the confinement effect, the latter obtained by performing finite element analysis. This numerical model predicts the shear resistance of the connection and enables to assess its fatigue limit which is necessary for the fatigue design proposed.
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Photovoltaic String Configuration for Optimal Inverter Performance
K.D.Papastergiou,P.Bakas,S.Norrga 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
in the recent years photovoltaic installations have been growing rapidly both in numbers and in size. The main reason for this growth has been the generous subsidies offered by policy makers. As financial incentives are now being gradually removed, PV plant manufacturers are in quest for more efficient plant configurations that eventually reduce the investment cost and increase the annual energy yield. This paper presents a methodology for optimally sizing the PV panel strings (series-parallel connection of PV generators) for any specific inverter equipment and for a given location weather dataset. The methodology is based on some new PV plant performance metrics presented here. Finally, the concept of maximum power point of the inverter (MPPTi) is introduced.
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Long-term monitoring of a hybrid SFRC slab on grade using recycled tyre steel fibres
Baricevic, Ana,Grubor, Martina,Paar, Rinaldo,Papastergiou, Panos,Pilakoutas, Kypros,Guadagnini, Maurizio Techno-Press 2020 Advances in concrete construction Vol.10 No.6
This paper presents one of the demonstration projects undertaken during the FP7 EU-funded Anagennisi project (Innovative reuse of all tyre components in concrete-2014-2017) on a full-scale (30 m×40 m, thickness: 0.2 m) Steel Fibre Reinforced Concrete (SFRC) slab-on-grade using a blend of manufactured steel fibres (MSF) and Recycled Tyre Steel Fibres (RTSF). The aim of the project was to assess the use of RTSF in everyday construction practice. The Anagennisi partners, Dulex Ltd in collaboration with Gradmont-Gradacac Ltd and University of Zagreb, designed, cast and monitored the long-term shrinkage deformations of the indoor slab-on-grade slab at Gradmont's precast concrete factory in Gradacac, Bosnia and Herzegovina. A hybrid RTSF mix (20 kg/㎥ of MSF+10 kg/㎥ of RTSF) was used to comply with the design criteria which included a maximum load capacity of 20 kN/㎡. The slab was monitored for one year using surveying equipment and visual inspection of cracks. During the monitoring period, the slab exhibited reasonable deformations (a maximum displacement of 3.3 mm for both, horizontal and vertical displacements) whilst after five years in use, the owners did not report any issues and were satisfied with the construction methodology and materials used. This work confirms that RSTF is a viable and sustainable solution for slab-on-grade applications.
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