Dynamik der Baukonstruktionen

Petersen, Christian; Werkle, Horst

doi:10.1007/978-3-322-80314-6

Cited by 123 publications

(26 citation statements)

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“…The overview of the corresponding results for all the recorded passages (table 3) confirms the very good accuracy of the MI measurements with respect to the natural frequency estimation. Figure 7 illustrates the damping estimation for the same train passage displayed in figure 5 using the logarithmic decrement approach [16]. As it can be seen, the estimations using data from the different types of sensors correspond well.…”

Section: Examplementioning

confidence: 72%

Microwave Interferometry Measurements for Railway-Specific Applications

Firus¹,

Schneider²,

Becker³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The microwave interferometry is a rather new measurement method, whose functioning principle allows the non-contact synchronous acquisition of structural displacements for several points along a structure, with accuracy in sub-millimetre range at a sampling rate of up to 4 kHz. Due to the high sampling rate, the acquisition of dynamic responses is also possible. Hence, main modal structural parameters such as natural frequencies and damping ratios can be straightforwardly identified. Furthermore, the synchronous measurement of several points along the targeted object, achieved due to a range resolution of about 0.75 m, may allow the direct determination of modal shapes. Under consideration of its novel character and a lack of previous experience with respect to railway-specific tasks, the measurement method had to be subjected to a systematic and comprehensive validation process prior to a reliable implementation in everyday practice. The validation process included several parallel measurements and comparisons with conventional measurement techniques. Besides the direct verification of the quality of the results, it was used as well for defining boundary conditions and limitations of the measurement method with respect to railway-specific applications. As a result, an evaluation matrix was created, which illustrates the applicability of the microwave interferometry for different types of structures. This paper gives a brief introduction of the microwave interferometry and presents some aspects and selected results of the validation process, which was performed within a cooperation project between the TU Darmstadt (Germany) and the German Railways (Deutsche Bahn AG).

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Section: Examplementioning

confidence: 72%

Microwave Interferometry Measurements for Railway-Specific Applications

Firus¹,

Schneider²,

Becker³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…(Pimentel;Fernandes, 2002) A formulação apresentada por Grundmann, Kreunzinger, Schineider (1993) é aplicável a passarelas simplesmente apoiadas de um vão único, baseada na analogia de sistema de um grau de liberdade e frequência natural da passarela igual à frequência de caminhada. O cálculo do valor da aceleração na direção transversal vertical, produzida por um pedestre cruzando a passarela, é dado pela Equação 32: Na qual: P: peso do pedestre igual a 700 N; M: massa total da passarela (kg); δ: amortecimento crítico em termos de decremento logarítmico (δ=2.π.ζ); para a madeira tem-se um valor médio de amortecimento crítico (δ=0,075) para passarelas de madeira (PETERSEN, 1996); n: número de passos para cruzar o vão (n=L/l p ); l p , obtido conforme Tabela 3; Nas Tabelas 5 e 6, têm-se os fatores dinâmicos de carregamento para o modelo de força de um indivíduo executando atividades de caminhada normal nas direções transversal vertical e transversal horizontal. Kreunzinger, Schineider (1993), podendo-se dizer que as Equações 23 a 27 são uma versão simplificada desses autores.…”

Section: (28)unclassified

Diretrizes normativas de conforto humano testadas em passarelas de madeira

2011

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ResumoAtividades como caminhar, correr e pular podem produzir excitações dinâmicas indesejadas, fenômeno da ressonância devido às forças dinâmicas induzidas por pedestres, caso as passarelas apresentem frequência natural dentro das faixas de frequências de passo. A avaliação dinâmica das passarelas de madeira se faz necessária para verificar o nível de conforto humano e a sua adequação quando submetidas à passagem de pedestres. O objetivo deste trabalho é apresentar uma revisão bibliográfica feita nas diretrizes normativas contidas nos códigos internacionais BS 5400, SIA 160, OHBDC, CEB, EUROCODE 5, AASHTO, BRO e ISO 10137, e nos estudos de diversos pesquisadores para verificação dessas estruturas no estado limite de serviço referente às vibrações. No Brasil, as normas NBR 7190 e NBR 7188 definem os critérios para o dimensionamento das passarelas de madeira considerando os estados limites últimos e de utilização sendo que neste último não se leva em conta o conforto humano com relação a vibrações. Assim sendo, as informações contidas neste estudo podem contribuir para o aprimoramento da norma brasileira ABNT NBR 7190, pois leva em conta o conforto humano devido às vibrações induzidas por pedestres em passarelas. Activities such as walking, running and jumping can produce undesirable dynamic excitations, which are a phenomenon that occurs due to pedestrian-induced dynamic forces whenever a footbridge features a natural frequency within stepping frequency ranges. Dynamic evaluations of timber footbridges are necessary to verify the level of human comfort and the suitability of the bridges when subjected to human traffic. The objective of this paper is to present a bibliography review on the standards guidelines contained in international codes BS 5400, SIA 160, OHBDC, CEB, EUROCODE 5, AASHTO, BRO and ISO 10137 as well as in studies by various researchers, in order to verify the serviceability limit state for vibrations. In Brazil, codes ABNT NBR 7190 and ABNT NBR 7188 set the sizing criteria for timber footbridges considering the ultimate and serviceability limit states, with the latter ignoring human comfort with regard to vibrations. Thus, the information contained in this study can contribute to the refinement of Brazilian code ABNT NBR 7190, as it takes into account human comfort in pedestrianinduced vibrations on footbridges.

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“…Basically there are two major motivations: in active seismic areas reliable earthquake resistant structures are required, and in our urban society a very important and challenging task is to encapsulate a building from the surrounding emissions to increase its comfort. In both cases it is essential not only to analyze the structure itself but also to take the surrounding soil into account [2,25,28].…”

mentioning

confidence: 99%

Parallel Computation of 3-D Soil-Structure Interaction in Time Domain with a Coupled FEM/SBFEM Approach

et al. 2011

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

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Dynamik der Baukonstruktionen

Cited by 123 publications

References 0 publications

Microwave Interferometry Measurements for Railway-Specific Applications

Microwave Interferometry Measurements for Railway-Specific Applications

Diretrizes normativas de conforto humano testadas em passarelas de madeira

Parallel Computation of 3-D Soil-Structure Interaction in Time Domain with a Coupled FEM/SBFEM Approach

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