<abstract xmlns="http://www.w3.org/1999/xhtml">A 3000 tones capacity silo, located in a seismic area with ground acceleration ag = 0,20g and TC =1,0s, was designed in a classical solution The supporting structure has an octagonal shape in planview, and columns with “Maltese cross sections”. The main lateral resisting system is made up of centric bracings with cross-section class I.The technological project has required two silos and the solution was to support them on a common raft foundation. The stresses and strains due the seismic action led to material consumption that exceeded the agreed budget. In order to reduce the costs, two versions of isolator positions were studied: base isolators (at the connection between infrastructure and superstructure) and at the silo’s bearing level on the supporting structure.A number of eight vertical seismic isolators were used and in order to limit the horizontal displacements due to wind action and for small intensity earthquakes special devices were introducedComparing the state of stresses and deformations and also the cost analysis regarding the positioning of the isolators, the second solution was chosen as the most feasible.</abstract>

Technical University of Civil Engineering, Faculty of Civil Engineering

Seismic Base Isolators For A Silo Supporting Structure

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper presents a study case and highlights the changes made by the new, in force, seismic Code P100-1/2013 in comparison with the former P100-1/2006, concerning the reinforced concrete frame structural systems design. Different seismic designed RC frames systems, compatible with modern office requirements, were studied. The influence of the earthquake codes provisions on design of regular buildings, having openings fitted for open spaces, with a story height of 3.50m, was assessed. The benefits of tubular structures, with rigid frames made of closely spaced columns on the building perimeter, were analyzed as well. The results of the study case are presented emphasizing the consequences of the application of the new seismic Code on the computation of the reinforced concrete frame structures.</abstract>

Seismic Design Of Low-Rise Office Buildings According To Romanian Seismic Codes. Case Study.

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper presents the <italic>Spectral Representation Theorem</italic> of a stationary process and two simulation methods derived from it. In order to test the accuracy of the two simulation methods two numerical applications are employed. First, using a theoretical power spectral density <italic>(PSD)</italic>, two sets of sample functions, corresponding to each method, are generated and a comparison of the obtained numerical results with the analytical <italic>PSD</italic> is carried out. The second example is more complex and consists in using the stationary zone of the strong motion of the recorded NS acceleration registered at INCERC during the 1977 Vrancea earthquake. The corresponding Fourier Spectrum is calculated. In order to obtain a smoother <italic>PSD</italic> representation for the real Fourier spectrum, a specific barrier model spectrum (<italic>SBM</italic>) is fitted to it and the corresponding <italic>PSD</italic> calculated. This <italic>PSD</italic> is used to generate two sets of samples. The mean <italic>PSD</italic> obtained using both methods of simulation is compared with that characterizing the registered acceleration. The paper shows that the generated time series possess all the theoretical probabilistic characteristics discussed below, when the number of terms used in the simulation formulas is large. Three types of estimators are employed in the numerical evaluation of both simulation methods</abstract>

Department of Mathematics and Computer Science, Technical University of Civil Engineering

Strength of Materials, Tunnels and Bridges Department, Technical University of Civil Engineering

Generating Stationary Gaussian Processes Using The Spectral Representation Theorem

<abstract xmlns="http://www.w3.org/1999/xhtml">One of the most destructive natural phenomena is the earthquake. These events destroy lives, goods and disrupt human activities. For this reason the anti-seismic protection of buildings is a very important and of interest subject in Civil Engineering. In the case of structures with a low seismic energy dissipation capacity (for example steel frame structures with Slimdek composite floors), this problem becomes more complicated due to the requirement of dampers. In this paper an experimental study is presented regarding an innovative yielding metallic energy dissipation device, proposed by the author. An experiment is carried out on a shake table. By studying the results from the experiments and from the previous carried out numerical analysis we can conclude that this device provides a high anti-seismic protection for this type of structures.</abstract>

„Gheorghe Asachi” Technical University of Iaşi, Faculty of Civil Engineering and Building Services

The Experimental Analysis Of An Innovative Yielding Metallic Damper

AHEAD OF PRINT

Volume 17 (2022): Issue 2 (June 2022)

Volume 17 (2022): Issue 1 (March 2022)

Volume 16 (2021): Issue 4 (December 2021)

Volume 16 (2021): Issue 3 (September 2021)

Volume 16 (2021): Issue 2 (June 2021)

Volume 16 (2021): Issue 1 (March 2021)

Volume 15 (2019): Issue 4 (December 2019)

Volume 15 (2019): Issue 3 (September 2019)

Volume 15 (2019): Issue 2 (June 2019)

Volume 15 (2019): Issue 1 (March 2019)

Volume 14 (2018): Issue 4 (December 2018)

Volume 14 (2018): Issue 3 (September 2018)

Volume 14 (2018): Issue 2 (June 2018)

Volume 14 (2018): Issue 1 (March 2018)

Volume 13 (2017): Issue 4 (December 2017)

Volume 13 (2017): Issue 3 (September 2017)

Volume 13 (2017): Issue 2 (June 2017)

Volume 13 (2017): Issue 1 (March 2017)

Volume 12 (2016): Issue 4 (December 2016)

Volume 12 (2016): Issue 3 (September 2016)

Volume 12 (2016): Issue 2 (June 2016)

Volume 12 (2016): Issue 1 (March 2016)

Volume 11 (2015): Issue 4 (December 2015)

Volume 11 (2015): Issue 3 (September 2015)

Volume 11 (2015): Issue 2 (May 2015)

Volume 11 (2015): Issue 1 (March 2015)

Volume 10 (2014): Issue 4 (December 2014)

Volume 10 (2014): Issue 3 (September 2014)

Volume 10 (2014): Issue 2 (June 2014)

Volume 10 (2014): Issue 1 (March 2014)

Volume 9 (2013): Issue 4 (December 2013)

Volume 9 (2013): Issue 3 (September 2013)

Volume 9 (2013): Issue 2 (June 2013)

Volume 9 (2013): Issue 1 (March 2013)

Modelling in Civil Environmental Engineering

The roots of the Technical University of Civil Engineering of Bucharest (UTCB) go back in 1818 in the school of engineering concerning surveying and geodesy. In 1864 it became the "School of Bridges and Roads, Mines and Architecture", and from 1867 the "School of Bridges, Roads and Mines" and "the National School for Bridges and Roads" in 1888. In 1921, the "National School of Bridges and Roads" became the "Polytechnic School of Bucharest", where the civil engineers' training was carried out in the Civil Engineering Department which, in 1938, came to be known as the Faculty of Civil Engineering.  In 1948, due to the large development of the construction sector in Romania, an important part of the Polytechnic School was separated as the Civil Engineering Institute, including not only the Faculty of Civil Engineering, but also parts of other specializations related to constructions, as building services engineering, mechanical engineering for constructions, hydrotechnical engineering, roads, bridges, and railways construction or geodesy.  Starting from 1994, the Civil Engineering Institute became the Technical University of Civil Engineering Bucharest (UTCB).  The scientific results were published internally in the university scientific bulletin. Since 2005, the scientific bulletin of UTCB became the Mathematical Modelling in Civil Engineering journal.  The journal serves the Civil and Environmental Engineering community and our societies, aiming to effectively contribute to the development, innovation and progress in the field. Our journal publishes papers that present the state-of the-art results from research and practice.  Starting with 2021, the journal Mathematical Modelling in Civil Engineering expands its research fields and thus becomes: Modelling in Civil and Environmental Engineering, with a new ISSN: 2784-1391.  The journal Modelling in Civil and Environmental Engineering covers a wide range of topics from Civil and Environmental Engineering field and is ready to publish high quality standards, state-of the-art, peer-reviewed papers, coming from the academic and research community, and industry as well. MCEE addresses both theoretical developments and practical applications related to Civil and Structural Engineering, Geotechnics and Environmental Science (Soil, Water and Air Pollution, Wastewater Treatment Engineering), Thermal Sciences and Engineering (Thermodynamics, Transport Phenomena, Building Heat &amp; Mass Transfer, HVAC &amp; R), Hydraulic and Wind Engineering, Mechanical and Electrical Engineering in the Built Environment, Automation in Constructions, Roads, Bridges and Railways Constructions, Surveying and Geodesy and any other topics related to constructions and the built environment.  To be acceptable for publication in the MCEE journal, a manuscript must address valuable and of significant interest scientific issues for the Civil Engineering community, free of evident commercial or private interest.  The authors are requested to make sure that appropriate research ethical standards are strictly followed in their work, when submitted to MCEE.　  The MCEE staff fully supports the authors during the entire evaluation process and is committed to ensure that the ethical standards, related to submittal, review, and publication of manuscripts, will be strictly followed.  Rejection rate   22%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 