ASA Structural Consultants

Thessaloníki, Greece

ASA Structural Consultants

Thessaloníki, Greece

Time filter

Source Type

Gioncu V.,Polytechnic University of Timişoara | Mosoarca M.,Polytechnic University of Timişoara | Anastasiadis A.,ASA Structural Consultants
Journal of Constructional Steel Research | Year: 2012

This paper is a development of the [1], presenting the new improvements in determining the rotation capacity of wide-flange beams. It deals with the available rotation capacity of steel beams, using the local plastic mechanism methodology. For these purposes, a more advanced software was elaborated at the "Politehnica" University of Timisoara, namely DUCTROT-M, substituting the old DUCTROT-96 computer program presented in [1]. The new version considers two different forms the in-plane and out-of-plane plastic mechanisms, as well as the application of gradient or quasi-constant moments. A CD-ROM containing the free DUCTROT-M computer program can be finding in Appendix of [2] or free on the site [3]. Thus, the present paper is focused on the phenomenological aspects of the utilized plastic collapse mechanisms, while the companion paper [41] is devoted to applications in design practice exploiting the new capabilities of the aforementioned current software version. © 2011 Elsevier Ltd. All rights reserved.


Anastasiadis A.,ASA Structural Consultants | Mosoarca M.,Polytechnic University of Timişoara | Gioncu V.,Polytechnic University of Timişoara
Journal of Constructional Steel Research | Year: 2012

Exploiting the capabilities of the DUCTROT-M computer program, a comparison between cross-section ductility classes, recommended in codes, and member ductility classes, proposed in technical literature, is performed, showing very important differences. A numerical analysis was carried out examining the main influencing factors such as collapse modes, fabrication details (welding, hot-rolling, connection details), material properties, geometrical beam dimensions and type of action. Because the out-of-plane mechanism produces very high ductility degradation during a cycling earthquake, the first purpose of the study is to determine the measures to eliminate this mechanism mode. For the welded beams, geometrical proportion of the flange and web thickness is the key, while for hot-rolled beams, the constructional detailing of the joint. The contribution of the junction between flange and web that increases the rotation capacity was revealed. Consequently, rolled and welded sections possess different available ductility, but this effect does not reflected to the current Eurocodes © 2011 Elsevier Ltd.


Mosoarca M.,Polytechnic University of Timişoara | Anastasiadis A.,ASA Structural Consultants | Kampouris A.,Democritus University of Thrace
Journal of Environmental Protection and Ecology | Year: 2014

At the beginning, human were making buildings inspiring themselves from different shapes that existed in nature. As human kind made scientific discoveries, the types of constructions evolved. With the purpose of ensuring the resistance, stiffness and stability of the buildings, humans have developed pollutant technologies. In the last period, free form buildings have appeared, which try to copy shapes from nature, from different objects, mechanisms. Are these buildings ecological? In the article are presented different opinions regarding this point of view.


Gioncu V.,Polytechnic University of Timişoara | Mosoarca M.,Polytechnic University of Timişoara | Anastasiadis A.,ASA Structural Consultants
Journal of Constructional Steel Research | Year: 2014

The paper tackles the influence of the near-field earthquakes on the available deformational capacity of steel elements through a global view, joining the results of the wave propagation theory with the one of the local plastic mechanisms. Different from the case of far-field earthquakes, where the structural behavior is dominated by cyclic loading, for near-field earthquakes the structural response is characterized by pulse loading produced by the seismic wave propagation along the height of the structure. Due to this fact, the structure response is dominated by the effect of the strain rate, thus reducing the local ductility and increasing the danger of fracture. After a presentation of the propagation theory applied to near-field earthquakes, the effect of the strain rate on the rotation capacity and on the fractural rotation of the beam elements, considering the fabrication type (rolled or welded) and temperature (room and low) conditions, is studied. It was revealed that the controlled flange buckling, as well as, the yielding ratio is the decisive parameters in order to avoid brittle failures. Finally, a novel representation about the damage produced during the Northridge and Kobe earthquakes due to seismic wave propagation is provided. © 2014 Elsevier Ltd.


Anastasiadis A.,ASA Structural Consultants | Mosoarca M.,Polytechnic University of Timişoara | Gioncu V.,Polytechnic University of Timişoara
Bulletin of Earthquake Engineering | Year: 2015

The paper investigates the available ductility of the steel beams under cyclic action. The study is based on the concept of the plastic collapse mechanism, previously developed for monotonic loading, and further implements the concept of the initial cumulative deformation; it aims to calculate the main parameters that affect the rotation capacity of steel I and H beams made by European sections. The findings show that the loading type defined by the increasing or the constant amplitude, the number of cycles producing strength and the ductility degradation and the cross section conformation are the factors of primary importance whereas, in general, the steel quality and the material variability have a secondary detrimental effect. © 2014, Springer Science+Business Media Dordrecht.

Loading ASA Structural Consultants collaborators
Loading ASA Structural Consultants collaborators