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Elastic shakedown limit of a steel lattice girder

Brzuzy Aneta

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych

2021

Nr 4

12--18

This paper presents a solution for the problem concerning the behaviour of a steel lattice girder subjected to dynamic load pulses. The theory of shakedown is used in the analysis. It is assumed that such loads cause a non-elastic response which includes dissipation of energy causing deformations and residual forces developed in the structural members of the girder. At a certain intensity of these forces, the girder can react to subsequent load pulses without further dissipation of energy, behaving in the elastic region after shakedown. This condition is referred to as adaptation of the structure to assumed cyclic loading. Elastic shakedown limit is determined through a direct analysis of the girder's dynamic behaviour, i.e. by checking if energy dissipation decreases with loading cycles. This gives the number of load applications after which no further increase of the energy dissipation is observed. The existing permanent deformations persist and residual forces remain in the same state. The analysis takes into account the possibility that compressed members can buckle which may result in non-elastic, longitudinal and transverse vibrations of these members. Non-linear geometry of members is taken into account. Then a perfectly elastic-viscoplastic model of the material is used. The main goal is to determine the state of the non-elastic movements of the girder joints and the residual internal forces developed in the girder members after each load application. The values obtained in this way serve as the basis for describing the next loading cycle. It is possible to use the approach presented in the paper to evaluate the effects of accidental loads. Then it is checked whether a small number of repetitions of accidental load would result in exceeding the serviceability limit state criteria of the maximum permanent deformation or displacement and/or strain amplitudes. If so, the magnitude of accidental load is greater than the elastic shakedown limit. Some examples are given to illustrate the application of the theory of shakedown.

System inteligentny dom : nowoczesna technologia stosowana w budownictwie

Sulikowska Olga, Brzuzy Aneta

Biuletyn Wojskowej Akademii Technicznej

2019

Vol. 68, nr 2

71--80

W opracowaniu przedstawiono informacje dotyczące systemu inteligentny dom wraz z uzasadnieniem tezy, że ta technologia może być stosowana w domach jednorodzinnych. Podano ogólną charakterystykę systemu, która zawiera historię powstania oraz istotę działania. Zwrócono uwagę na mniejsze zużycie energii, dzięki zastosowaniu technologii, przez co budynki mogą łatwiej spełnić wymagania Dyrektywy Parlamentu Europejskiego z roku 2010. W artykule opisano najważniejsze podfunkcje, takie jak np. sterowanie oświetleniem, ogrzewaniem czy podsystem przeciwpożarowy. Na podstawie układu funkcjonalnego domu jednorodzinnego wykonano analizę najważniejszych rodzajów systemu. W pracy stwierdzono, że systemy inteligentnego domu można stosować nie tylko na etapie budowy, lecz także w istniejących budynkach, bez potrzeby ingerencji w ściany.

The study presents information about the intelligent house system along with the justification of the thesis that this technology can be used in single-family houses. The general characteristics of the system are given, which include the history of the creation and the essence of operation. Attention has been paid to lower energy consumption due to the use of technology, which makes it easier for buildings to meet the requirements of the European Parliament Directive 2010. The article describes the most important sub-functions, such as lighting, heating or fire-protection subsystem. Based on the functional layout of a single-family home, the analysis of the most important types of the system was carried out. The study states that smart home systems can be used not only at the construction stage, but also in existing buildings, without the need for interference in the walls.