Journal of Architectural and Engineering Research https://jaer.nuaca.am/index.php/jaer <p><em><strong>Journal of Architectural and Engineering Research</strong></em> is an international, peer-reviewed, open-access e-journal, free of charge.</p> National University Of Architecture And Construction Of Armenia en-US Journal of Architectural and Engineering Research 2738-2656 Conceptual Approaches to Solving the Issue of Reinforcing the Rock - Cut Structures of Geghard Monastery Complex https://jaer.nuaca.am/index.php/jaer/article/view/38 <p><em>The article presents a visual and instrumental research of the technical condition of the main rock-cut structures and their masonry additions, the documentation of their damages (cracks, crevices, destructions and erosions) and deformations, thorough complete laboratory studies of rock samples and their physical and mechanical characteristics, conceptual approaches to preventive and reinforcing measures necessary for the further safe survival of structures, as well as the comprehensive development and implementation of measures to prevent further damages (elimination of causes) and ensure the long-term existence of structures. Based on the analyses carried out, it is recommended to use a ready-made dry mixture mortar of the “Mapegrout'' brand produced by the Italian company “Mapei” to fill cracks if necessary. It is available in the market of the country and is successfully used in the reconstruction of tunnels and other underground structures. The issues of compatibility of reinforcing materials with sandstone rock are also considered on the basis of some averaged data of the main decisive physical and mechanical characteristics of the strength and deformation of sandstone.</em></p> † Artavazd Avetik Arzumanyan Avetik Artavazd Arzumanyan Hasmik Hamlet Qaramyan Nelli Gagik Muradyan Copyright (c) 2021 † Artavazd Avetik Arzumanyan, Avetik Artavazd Arzumanyan, Hasmik Hamle Qaramyan, Nelli Gagik Muradyan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 3 9 10.54338/27382656-2021.1-9 Analysis of Structure Displacement Formed as a Result of Torsion in Case of Using Rubber-Metal Seismic Isolators https://jaer.nuaca.am/index.php/jaer/article/view/39 <p><em>The study of a building with a complex planning solution, rubber-metal laminated seismic isolation supports (hereinafter referred to a RMLSIS) placed at the foundation level and with a reinforced concrete </em></p> <p><em>frame-braced system is presented, taking into account the displacement of the structure formed as a result of torsion. The analyses were conducted with the finite element method. The calculation schemes were modeled using the "Lira-SAPR" software. The displacement of the structure formed as a result of torsion of buildings having the same planning solution, different number of floors as well as with and without RMLSIS is estimated. The results obtained show that the displacement values of the structure formed as a result of torsion increased about 40% in buildings without RMLSIS and 25% in buildings with RMLSIS.</em></p> Hovhannes Armen Avagyan Arman Sevak Margaryan Copyright (c) 2021 Hovhannes Armen Avagyan, Arman Sevak Margaryan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 10 15 10.54338/27382656-2021.1-10 The Impact of the Constructive Solution on the Formation of the Portal in the Architecture of Armenian Churches of 4th-7th Centuries https://jaer.nuaca.am/index.php/jaer/article/view/40 <p><em>The article refers to the issues of decorative elements in architecture. The aim of the paper </em><em>was</em><em> to</em> <em>reveal the interaction peculiarities of the constructive and artistic solutions of the formation of the portal</em><em>s</em><em> of the Armenian churches of 4<sup>th</sup>-7<sup>th</sup> centuries. </em><em>The analysis of </em><em>the process of formation allowed for carrying out the typological classification of the portals from the point of view of the transformation and development of the lintel construction. The classification showed that the portal created as a decoration of the entrance, as a result of the evolution of compositional-structural components was transformed into a unified constructive-artistic element</em><em>, which </em><em>has become the main type used in the later periods of the Armenian medieval architecture. The revealed features of the interaction of decorative and structural elements can be useful in the field of heritage studies and in the development of further works on the formation of decorative elements</em><em>.</em></p> Karen Ruben Azatyan Ruben Shmavon Azatyan Arpine Aram Yolyan Nikolai Oleg Smelkov Copyright (c) 2021 Ruben Shmavon Azatyan, Karen Ruben Azatyan, Arpine Aram Yolyan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 16 31 10.54338/27382656-2021.2-1 The Dependence of Durability and Deformation of Elements of Soil Cement Composite with Carbonate White Soil Mixture on Age https://jaer.nuaca.am/index.php/jaer/article/view/45 <p><em>The results of an experimental study of changes in strength and deformability during the period of time subjected to short-term loading of elements made of a soil-cement composite based on </em><em>white soil (</em><em>belozems) of carbonate composition are discussed.</em></p> <p><em>Research was carried out in accordance with current standards, as well as a well-known method that has been repeatedly tested earlier.</em></p> <p><em>To assess the experimentally established data, the results of similar studies by other authors, carried out applying elements from soil-cement based on clay soils, as well as from lightweight concrete on lithoid pumice (volcanic rock), are also presented.</em></p> <p><em>On the basis of the comparative analyzes of the experimentally established data, conclusions are formulated. The consideration of those may be useful both for the estimation of optimal schedules of the construction of buildings from a soil-cement composite, and for the assessment of their stress-strain state.</em></p> Koruyn Ashot Karapetyan Sargis Hrachik Hairoyan Eghishe Samvel Manukyan Copyright (c) 2021 Koruyn Ashot Karapetyan, Sargis Hrachik Hairoyan, Eghishe Samvel Manukyan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 32 40 10.54338/27382656-2021.2-2 Study on the New Method of Constructing Shear Walls in Multi-Storey Buildings With Site Cast Reinforced Concrete Frame System https://jaer.nuaca.am/index.php/jaer/article/view/40-46 <p><em>The article touches upon the comparative analysis of bearing system calculations of a multi-storey residential building with site cast reinforced concrete frame and shear wall constructed by two different methods.&nbsp; In the calculation models, the shear walls are constructed from site cast reinforced concrete in the first case, and from three-layer sound and thermal insulating bearing panels in the second. The calculations have been made considering the impact of the seismic force. According to the calculation results, the dynamic parameters of the bearing systems of the buildings and the economic efficiency indicators have been compared. Considering the fact that in the recent years three-layer sound and thermal insulating panels have been widely used in the world, the study attempted to reveal the efficiency of using such panels in the Republic of Armenia.</em></p> Lusine Gurgen Karapetyan Tigran Vardan Ter-Poghosyan Copyright (c) 2021 Lusine Gurgen Karapetyan, Tigran Vardan Ter-Poghosyan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 41 47 10.54338/27382656-2021.1-11 The Importance of Historical Stages of Construction Within the Context of Sustainable Urban Development of Hadrut City https://jaer.nuaca.am/index.php/jaer/article/view/42 <p><em>Preservation of Artsakh's architectural heritage and the issues of use have acquired a special significance today. The historical stages of the construction of the city of Hadrut in Artsakh, and, as a result of their analysis, their impact on the further sustainable development of the city have been revealed. There are 5 main stages: formation, late Middle Ages, </em><em>from </em><em>the 19<sup>th </sup>century to </em><em>the </em><em>first half of</em><em> the 20<sup>th</sup> century</em><em>, Soviet and independence periods. Suggestions are given on the territorial development of the city. </em></p> Nina Armen Nersesyan Copyright (c) 2021 Nina Armen Nersesyan https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 48 55 10.54338/27382656-2021.1-12 Stiffness of Post-Tensioned Girderless Floor With Different Column Grids https://jaer.nuaca.am/index.php/jaer/article/view/44 <p><em>The paper considers models of monolithic flat floor slabs with five spans in both directions. The cell sizes are 6×6m, 6×9m, and 6×12m. The calculation method is based on the application of temperature load and rope modeling of rod elements. It is shown that post-stressing should be used for slab side lengths over 7 m, as the installation of pre-stressed reinforcement for shorter lengths is less feasible and causes high economic costs.</em></p> Ashot George Tamrazyan Tatiana Anatolу Matseevich Copyright (c) 2021 Ashot George Tamrazyan, Tatiana Anatolу Matseevich https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 56 61 10.54338/27382656-2021.2-3 The Basics of Developing an Alternative Concept for Commercial and Military Vehicle Operation (Random Strategy) https://jaer.nuaca.am/index.php/jaer/article/view/43 <p>The efficiency of commercial automobiles and wheeled military vehicles mainly depends on the choice of maintenance (M) and current repair (CR) concept. In the paper the difficulties of adapting the (M) and (CR) planning strategies to the structural characteristics of modern transport facilities are pointed out. The advantages of using the (M) and (CR) random strategy for transport facilities based on the stochastic nature of failures and malfunctions are substantiated. Considering the failures and malfunctions as random values and identifying the patterns of their distribution based on γ percentage resources, it is proposed to develop a list of regulated maintenance and repair work, periodicity and labor intensity based on a random strategy, which will increase the efficiency of preserving the technical resource of the rolling stock throughout the entire life cycle of the vehicle.&nbsp;</p> Yeghiazar Vahram Vardanyan Valerik Mamikon Harutyunyan Karo Hakob Mosikyan Vladimir Sahidovich Koichev Copyright (c) 2021 Yeghiazar Vahram Vardanyan, Valerik Mamikon Harutyunyan, Karo Hakob Mosikyan, Vladimir Sahidovich Koichev https://creativecommons.org/licenses/by-nc/4.0 2021-12-26 2021-12-26 1 2 62 69 10.54338/27382656-2021.2-4