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Sofia, Bulgaria

The University of Architecture, Civil Engineering and Geodesy is located in Sofia, Bulgaria.It was founded in 1942 as a Higher Technical School following a decree issued on June 6, 1941 by the Bulgarian Tsar Boris III. In 1945 it was transformed into a State Polytechnic. In 1953 the Polytechnic was divided into several institutes one of them being the Institute of Civil Engineering. Since 1977 the institute is renamed Higher Institute of Architecture and Civil Engineering . In 1990 by a decision of its General Assembly the Institute was renamed University of Architecture, Civil Engineering and Geodesy , the official accreditation being voted by the Parliament on 21 July 1995. On 15.11.2001 received institutional accreditation. Wikipedia.

Rizov V.,University of Architecture, Civil Engineering and Geodesy
Computational Materials Science | Year: 2013

Fracture behavior of polymer composites was investigated using Single Edge Notched Bending (SENB) specimens. The basic idea of this research was to check the ability of the SENB test method for generating mixed-mode I/II loading conditions by introducing an inclined notch as initial crack. For this purpose, SENB specimens containing a notch inclined at different angles were tested under static loading at room temperature. Three-dimensional finite element models were developed for simulating the mechanical response of the SENB test specimens. The test data were analyzed using methods of linear-elastic fracture mechanics. In order to validate the models, the predicted load-displacement responses were compared to the measured ones at different inclinations of the notch. From the experimentally measured crack growth initiation loads critical strain energy release rates at various mixed-mode I/II loading conditions were computed using the virtual crack closure technique. Non-uniform distribution of the critical strain energy release rate mode components along the crack front was obtained. It was found that besides modes I and II, there was also insignificant mode III component of the critical strain energy release rate. The simulations revealed that the relative amount of mode II component of the critical strain energy release decreased with increasing the notch inclination. It was shown that SENB specimens with inclined notch can be used for investigating fracture behavior of fiber reinforced polymer composites under various mixed-mode I/II crack loading conditions. © 2013 Elsevier B.V. All rights reserved.

Apostolov A.T.,University of Architecture, Civil Engineering and Geodesy
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2014

In order to study the multiferroic properties of LiCu2O 2 we propose a microscopic model taking into account intra- and inter-chain magnetic interactions, frustration and a linear magnetoelectric (ME) coupling. The real part of the dielectric constant in c direction, c has two kinks near the magnetic phase transition temperatures TN2=22 K and TN1=25 K which disappear with increasing of an external magnetic field Hc. This behavior is an evidence for a strong ME coupling in agreement with the experimental data. The polarization Pc(T,H) is also calculated. It is shown that the ferroelectric properties do not uniquely originate from spiral spin order, so the linear ME coupling plays an important role. © 2014 Elsevier B.V. © 2014 Elsevier B.V. All rights reserved.

Dimitrova E.,University of Architecture, Civil Engineering and Geodesy
Journal of Cleaner Production | Year: 2014

Based on a 10-year experience of embedding the 'sustainable development' topic into a newly established programme in Urbanism in Sofia, the paper discusses the influence of context, both geopolitical - Central and Eastern Europe (CEE), and professional-urban and regional planning, on the educational concept and the choices made on the modules' structure, contents and result evaluation. The estimation of the context relevance of the educational process and results addresses three aspects - advanced European practice in higher education for sustainable development, educational needs in the spatial planning field, and CEE regional peculiarities. Through analysing identified contextually rooted challenges and success factors in the educational process, and relating them to the broader global and regional process, the author claims the need for a better focused and contextually sensitive support to the local efforts for integrating the SD topic into the restructuring higher education institutions in the CEE region. © 2013 Elsevier Ltd. All rights reserved.

Ivanova S.M.,University of Architecture, Civil Engineering and Geodesy
Solar Energy | Year: 2014

This article presents a novel analytical approach to estimate the background component of diffuse irradiance on horizontal surfaces under partially obstructed anisotropic sky, when neighbor orthogonal vertical and horizontal surfaces hide parts of the sky dome. This helps to calculate the incident diffuse radiation onto horizontal roofs of orthogonal buildings using the defined here horizontal anisotropic sky view factors. The case of infinitely long urban canyon also is studied. The resulting equations include an isotropic part and an anisotropic correction. At last the article describes diffuse energy balance principles as a part of the base of anisotropic factor algebra. The article includes examples that demonstrate how new anisotropic view factors can be computed from a set of known factors with the help of anisotropic factor algebra. © 2013 Elsevier Ltd.

Radeva S.,University of Architecture, Civil Engineering and Geodesy
Nuclear Engineering and Design | Year: 2010

An approach for multiple-model structural control is developed for seismic protection of nuclear power plant, based on active structural control systems. Structural control provides opportunity to realize measures for reduction of seismic vulnerability of high risk structures, like nuclear power plants. The reliability of devices and systems for seismic protection is proved after modelling and simulation of seismic structural control with strong motion real or synthetic seismic signals, maximal close to the realistic ones. In suggested multiple-model system each sub-system corresponds to different actuator or combination of actuators for structural control of different parts of reactor building. After determination of frequency, characteristics, resonances and anti-resonances, is taken decision about reconfiguration of the structural control system. Simulation results for multiple-model active structural control system are shown. © 2009 Elsevier B.V. All rights reserved.

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