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Abstract(s)
O presente trabalho insere-se no âmbito da avaliação da resposta dinâmica da torre de telecomunicações do Monte da Virgem sob ação do vento. Pretende-se com este trabalho caracterizar a resposta da estrutura em termos de acelerações, identificando as situações em que esta resposta surge amplificada, e, associando aos regimes de vento que provocam este efeito. Inicialmente serão apresentadas algumas investigações de âmbito internacional, de forma a adequadamente contextualizar a investigação realizada, sendo posteriormente detalhados alguns dos estudos realizados na torre do Monte da Virgem, em particular os relacionados com o desenvolvimento de um modelo numérico calibrado da torre, com base nos resultados experimentais a partir de um ensaio de vibração ambiental e os referentes à instalação de um sistema de monitorização contínua. A análise das informações do sistema de monitorização contínua, motivou o desenvolvimento de ferramentas computacionais em ambiente Matlab que automatizaram a caracterização de eventos em a resposta dinâmica da torre surge significativamente amplificada, denominados de eventos críticos, em termos da sua frequência, duração e amplitude. A ocorrência destes eventos é devida ao contributo de modo local de vibração da estrutura do palito metálico, que demonstrou a ser particularmente sensível a regimes de vento específicos de direção este e com velocidades na ordem dos 20-30 km/h.
This paperwork falls within the scope of the study of the wind effects on the dynamic response of Monte da Virgem telecommunications tower. This work consists on the characterization of the response in terms of accelerations and the identification of the moments when its response is amplified and identifying the wind behaviour that ignite these effects. Initially will be referred some international studies, in order to properly contextualize the investigation that is being conducted, which will be later detailed some of the studies done on Monte da Virgem telecommunications tower, in particular the ones related to the development of calibrated numerical model of the tower, based on the experimental results of one ambient vibration test and regarded the installation of a permanent monitoring system. The analysis of the information withdrawn of the permanent monitoring system motivated the development of programmed routines with the software Matlab which automatized the characterization of events in which the tower’s response is significantly amplified, classified as critical events, in terms of frequency, duration and its extent. The occurrence of these events is due to the contribute of a local vibration mode of the metal structure, which has showed to be sensitive to specific wind behaviours from east, with velocities around 20-30 km/h.
This paperwork falls within the scope of the study of the wind effects on the dynamic response of Monte da Virgem telecommunications tower. This work consists on the characterization of the response in terms of accelerations and the identification of the moments when its response is amplified and identifying the wind behaviour that ignite these effects. Initially will be referred some international studies, in order to properly contextualize the investigation that is being conducted, which will be later detailed some of the studies done on Monte da Virgem telecommunications tower, in particular the ones related to the development of calibrated numerical model of the tower, based on the experimental results of one ambient vibration test and regarded the installation of a permanent monitoring system. The analysis of the information withdrawn of the permanent monitoring system motivated the development of programmed routines with the software Matlab which automatized the characterization of events in which the tower’s response is significantly amplified, classified as critical events, in terms of frequency, duration and its extent. The occurrence of these events is due to the contribute of a local vibration mode of the metal structure, which has showed to be sensitive to specific wind behaviours from east, with velocities around 20-30 km/h.
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Keywords
Torre de telecomunicações Resposta dinâmica Acelerações Regimes de vento Ensaio de vibração ambiental Calibração Modelo numérico Eventos críticos Ferramentas computacionais Telecommunications tower Dynamic response Accelerations Wind behaviour Ambient vibration test Calibration Numerical model Critical events Programmed routines