scholarly journals Parallel Code Execution as a Tool for Enhancement of the Sustainable Design of Foundation Structures

2021 ◽  
Vol 13 (3) ◽  
pp. 1145
Author(s):  
Jiri Brozovsky ◽  
Radim Cajka ◽  
Zdenka Neuwirthova
Keyword(s):  
Service Life ◽  
Civil Engineering ◽  
Sustainable Design ◽  
Numerical Models ◽  
Computer Hardware ◽  
Engineering Practice ◽  
Engineering Structures ◽  
Model Case ◽  
In Situ Experiments ◽  
Complex Models

Civil engineering structures are always in interaction with the underlying parts of the Earth. This form of interaction results in deformations and stresses that affect the service life of structures. Long and predictable service life is one of important aspects of sustainable design. Thus, good knowledge of the interaction effects is an essential part of sustainable design. However, to obtain this information, the use of complex numerical models is often necessary. In many cases, the creation and analysis of such complex models are not possible with the tools usually available in civil engineering practice. Technically, the necessary software and computer hardware exist, but their use for such tasks is still very infrequent and includes many challenges. The main aim of this article was thus to propose an approach of numerical analysis that utilizes parallel supercomputers and software based on the finite element method. The paper concentrated on the feasibility of the solution and on calculation times, because these aspects are usually the main reasons why engineers in practice tend to reject these approaches. The approach was demonstrated on a model case that was compatible with actual in situ experiments executed by the author’s team, and thus the validity of the computed results is verifiable. Limitations of the proposed approach are also discussed.

scholarly journals Modelling of chloride ingress in concrete based on benchmarking field results

2018 ◽  
Vol 199 ◽  
pp. 01005 ◽  
Author(s):  
E.A.B. Koenders
Keyword(s):  
Service Life ◽  
Structural Design ◽  
Numerical Models ◽  
Concrete Structures ◽  
Research Community ◽  
Chloride Ions ◽  
Analytical Models ◽  
Design Stage ◽  
Engineering Practice ◽  
Chloride Ingress

Modelling the ingress of chloride ions into the cover of a concrete structure is a phenomenon that is gaining an increasing attention of the research community, but even more, from the engineering practice. As the mechanism that drives the ingress of chlorides is implicitly responsible for the service-life of concrete structures, its input parameters are a major issue whenever predicting the service-life of new concrete structures. In this paper most relevant parameters involved in the evaluation of chloride ingress models are discussed and related to the benchmark activities that currently run in RILEM TC 270-CIM on benchmarking Chloride Ingress Models. The results provide an overview of the models used in the structural design stage, mostly analytical models, and in the rehabilitation stage, mostly numerical models.

Toward an adaptive vibration absorber using shape-memory alloys, for civil engineering applications

2017 ◽  
Vol 29 (5) ◽  
pp. 729-740 ◽  
Author(s):  
Filipe Amarante dos Santos ◽  
João Nunes
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Civil Engineering ◽  
Numerical Models ◽  
Vibration Absorber ◽  
Temperature Modulation ◽  
Engineering Structures ◽  
Joule Effect ◽  
Control Approach ◽  
Civil Engineering Structures

This article explores the capabilities of a novel adaptive vibration absorber for civil engineering structures, with regard to frequency self-tuning, based on the temperature modulation of shape-memory alloy restitution elements. This real-time temperature modulation of shape-memory alloys, through Joule effect, enables to control the elastic modulus of these elements, by inducing thermal martensitic transformations, and allows for the adaptation of the stiffness of the absorber, in order to be continuously tunable for a wide frequency range. A series of simulations are performed, using numerical models of a lively footbridge, to give an additional insight into the high potentialities of this adaptive control approach in the mitigation of vibrations in civil engineering structures.

scholarly journals Vibration Properties of a Concrete Structure with Symmetries Used in Civil Engineering

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 656
Author(s):  
Sorin Vlase ◽  
Marin Marin ◽  
Ovidiu Deaconu
Keyword(s):  
Dynamic Analysis ◽  
Concrete Structure ◽  
Current Practice ◽  
Civil Engineering ◽  
Engineering Practice ◽  
Design Time ◽  
Vibration Properties ◽  
Reduced Costs ◽  
Constructive Simplicity ◽  
Economic Considerations

The paper aims to study a concrete structure, currently used in civil engineering, which has certain symmetries. This type of problem is common in engineering practice, especially in civil engineering. There are many reasons why structures with identical elements or certain symmetries are used in industry, related to economic considerations, shortening the design time, for constructive, simplicity, cost or logistical reasons. There are many reasons why the presence of symmetries has benefits for designers, builders, and beneficiaries. In the end, the result of these benefits materializes through short execution times and reduced costs. The paper studies the eigenvalue and eigenmode properties of vibration for components of the constructions’ structure, often encountered in current practice. The identification of such properties allows the simplification and easing of the effort necessary for the dynamic analysis of such a structure.

scholarly journals Advanced experimental approaches to marine water-column biogeochemical processes

2017 ◽  
Vol 75 (1) ◽  
pp. 30-42 ◽  
Author(s):  
Louis Legendre ◽  
Richard B Rivkin ◽  
Nianzhi Jiao
Keyword(s):  
Water Column ◽  
Numerical Models ◽  
Free Water ◽  
Sea Surface ◽  
Biogeochemical Processes ◽  
In Situ Experiments ◽  
Technological Developments ◽  
Approaches To Study ◽  
Experimental Approaches

Abstract This “Food for Thought” article examines the potential uses of several novel scientific and technological developments, which are currently available or being developed, to significantly advance or supplement existing experimental approaches to study water-column biogeochemical processes (WCB-processes). After examining the complementary roles of observation, experiments and numerical models to study WCB-processes, we focus on the main experimental approaches of free-water in situ experiments, and at-sea and on-land meso- and macrocosms. We identify some of the incompletely resolved aspects of marine WCB-processes, and explore advanced experimental approaches that could be used to reduce their uncertainties. We examine three such approaches: free-water experiments of lengthened duration using bioArgo floats and gliders, at-sea mesocosms deployed several 100s m below the sea-surface using new biogeochemical sensors, and 50 m-tall on-land macrocosms. These approaches could lead to significant progress in concepts related to marine WCB-processes.

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