Wyniki wyszukiwania - BazTech

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Development of Data-mining Technique for Seismic Vulnerability Assessment

Wojcik Waldemar, Karmenova Markhaba, Smailova Saule, Tlebaldinova Aizhan, Belbeubaev Alisher

International Journal of Electronics and Telecommunications

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2021

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Vol. 67, No. 2

261--266

EN

Assessment of seismic vulnerability of urban infrastructure is an actual problem, since the damage caused by earthquakes is quite significant. Despite the complexity of such tasks, today’s machine learning methods allow the use of “fast” methods for assessing seismic vulnerability. The article proposes a methodology for assessing the characteristics of typical urban objects that affect their seismic resistance; using classification and clustering methods. For the analysis, we use kmeans and hkmeans clustering methods, where the Euclidean distance is used as a measure of proximity. The optimal number of clusters is determined using the Elbow method. A decision-making model on the seismic resistance of an urban object is presented, also the most important variables that have the greatest impact on the seismic resistance of an urban object are identified. The study shows that the results of clustering coincide with expert estimates, and the characteristic of typical urban objects can be determined as a result of data modeling using clustering algorithms.

2

Ultimate strengths of FRC rectangular columns subjected to simulated seismic loading: Experimental database and new models

Cai G., Degée H.

Archives of Civil and Mechanical Engineering

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2017

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Vol. 17, no. 1

96--120

EN

While there are many experimental investigations focusing on seismic behaviour of fibre reinforced concrete (FRC) columns, the studies regarding the accuracies and conservativeness of existing seismic strength models of FRC columns are limited. This paper presents a seismic research database of 322 FRC columns obtained from a comprehensive literature investigation. The characteristic of the database and the effects of main variables on the seismic strengths of FRC columns are analyzed in detail, the accuracies of existing strength models of FRC column are also examined as well. In addition, using the database, considering the effects of fibre and other structural factors on FRC columns, Priestley et al. shear and CFB-FIP moment models are modified respectively. Results show that the two proposed strength models both present better evaluation than other models. On the other hand, a detailed method for assessing the potential failure mode of FRC column subjected to seismic loads is also suggested using the two strength models. The comparative results verify the feasibilities and accuracies of the assessment method in FRC columns.

3

Modelling of concrete buildings for practical nonlinear seismic response analysis

Fardis M.

Architecture Civil Engineering Environment

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2010

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Vol. 3, no. 1

31-46

EN

Member modelling for the practical evaluation of the seismic performance of real concrete buildings on the basis of nonlinear dynamic analysis in 3D is overviewed. Fibre Element modelling is highlighted and contrasted to simplified lumped inelasticity models of members, with parameters fitted to a wealth of cyclic test results. An application to a full-scale 3-storey structure in 3D subjected to seismic testing under two horizontal components of ground motion validates this latter type of modelling. Two further applications are presented, one to explain the partial collapse of a multi-storey building in the Athens (1999) earthquake and another for the seismic assessment and retrofitting of a theatre building. The applications, which demonstrate simple lumped inelasticity member models, with parameters fitted to test results, are cost-effective and reliable alternatives to prohibitive Fibre Element modelling.

PL

W artykule przedstawiono modelowanie (na bazie nieliniowej analizy dynamicznej w 3D) elementów rzeczywistych budynków betonowych, służące do praktycznej oceny wpływu oddziaływań sejsmicznych. Wyróżniono modelowanie elementami pasmowymi, w odróżnieniu od uproszczonych niesprężystych modeli skupionych elementów z parametrami dopasowanymi do dużej ilości wyników badań cyklicznych. Wykonanie trójwymiarowego, naturalnej wielkości modelu 3-kondygnacyjnej konstrukcji poddanej obciążeniu sejsmicznemu, w postaci dwóch poziomych składowych ruchu gruntu, uzasadnia zastosowanie tego drugiego typu modelowania. Przedstawiono również dwa dalsze zastosowania, pierwsze do wyjaśnienia częściowego zawalenia się wielokondygnacyjnego budynku w wyniku trzęsienia ziemi w Atenach (1999) i drugie do oceny sejsmicznej i modernizacji budynku teatru. Przedstawione zastosowania dowodzą, że proste, niesprężyste modele skupione, z parametrami dostosowanymi do wyników badań są ekonomicznie efektywne i stanowią pewną alternatywę dla modelowania elementami pasmowymi.