<abstract xmlns="http://www.w3.org/1999/xhtml">This paper presents a global fire risk assessment by using fire simulation in an existing underground parking. The simulation is conducted with the Fire Dynamics Simulator, a Computational Fluid Dynamics (CFD) tool and the simulations are performed on a threedimensional model of the parking. Multiple parameters and factors are taken into account in this complex assessment, such as geometry data, ventilation openings (both mechanical and natural), fire detection and fire suppression details. The output of the case study is represented by a large array of data: the time for sprinkler activation, maximum temperatures, smoke flow and overall fire evolution. The intention of the authors is to provide a global fire risk assessment of the parking, based on the fire safety engineering principles.</abstract>

Alexandru Ioan Cuza Police Academy, Fire Officers Faculty

Fire Safety Association, Fire Research Department

Neron Lupaşcu Buzău County Inspectorate for Emergency Situations

Fire Safety Evaluation of an Underground Car Park Using Numerical Simulation

<abstract xmlns="http://www.w3.org/1999/xhtml">Sedimentation tanks are a major and important component of the wastewater treatment plants, where the cost of construction for traditional tanks may represent up to 30% of the total cost of the plants, as well as sedimentation tanks occupy relatively large areas and often require long retention times to separate the suspended solids from the liquid. High-rate tube settlers are one of the practical solutions for the development of treatment plants, especially sedimentation tanks, lamella systems can be used instead of conventional sedimentation basins or for upgrade and increase their capacity and efficiency. In addition to their high efficiency, they require much less space compared to conventional sedimentation tanks. The current study was developed to evaluate the performance of the tube settler and the effect of the inclination of tube settler on the effluent quality. In the practical experiments, tube settler unit consisting of four separate circular tubes of 27 mm inner diameter, with a length of 150 cm each were used at different inclination angles of 48, 54 and 60 degrees. A pilot scale model of coagulation-flocculation followed by sedimentation unit was prepared &amp; installed at Colentina Laboratory Complex-UTCB for this purpose.</abstract>

Technical University of Civil Engineering of Bucharest

Performance of the Tube Settler Clarification at Different Inclination Angles and Variable Flow Rate

<abstract xmlns="http://www.w3.org/1999/xhtml">An empirical formula based on evolutionary regression network is proposed in this paper for predicting the equilibrium depth of scour around bridge piers. The formula expresses the equilibrium scour depth as a function of variables including flow depth and mean velocity, critical flow velocity, median grain size and pier diameter. The empirical formula is developed by training and testing an evolutionary network using scour data available in the literature. The use of the evolutionary algorithm in developing the formula is informed by the need to reduce the model complexity while sacrificing its predictive accuracy. The results of performance comparisons with existing models showed that the proposed formula model produces reasonably accurate estimates of equilibrium scour depth with a much smaller number of fitting constants compared with backpropagation neural networks.</abstract>

Prediction of Scour Depth Around Bridge Piers Using Evolutionary Neural Network

<abstract xmlns="http://www.w3.org/1999/xhtml">In recent years, the pounding effect during earthquake is a subject of high significance for structural engineers. In this paper, a state space formulation of the equation of motion is used in a MATLAB code. The pounding forces are calculated using nonlinear viscoelastic impact element. The numerical study is performed on SDOF structures subjected by 1940 EL-Centro and 1977 Vrancea N-S recording. While most of the studies available in the literature are related to Newmark implicit time integration method, in this study the equations of motion in state space form are direct integrated. The time domain is chosen instead of the complex one in order to catch the nonlinear behavior of the structures. The physical nonlinear behavior of the structures is modeled according to the Force Analogy Method. The coupling of the Force Analogy Method with the state space approach conducts to an explicit time integration method. Consequently, the collision is easily checked and the pounding forces are taken into account into the equation of motion in an easier manner than in an implicit integration method. A comparison with available data in the literature is presented.</abstract>

Technical University of Civil Engineering

A State Space Formulation for the Evaluation of the Pounding Forces During Earthquake

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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. 