{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,26]],"date-time":"2025-07-26T09:17:20Z","timestamp":1753521440593,"version":"3.37.3"},"reference-count":29,"publisher":"IOP Publishing","issue":"18","license":[{"start":{"date-parts":[[2024,6,1]],"date-time":"2024-06-01T00:00:00Z","timestamp":1717200000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2024,6,1]],"date-time":"2024-06-01T00:00:00Z","timestamp":1717200000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["J. Phys.: Conf. Ser."],"published-print":{"date-parts":[[2024,6,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Cahora Bassa dam is a 170m-high arch dam located in western Mozambique. In operation for almost 50 years, since 1974, the dam is affected by a swelling process of small\/medium amplitude. Aiming to control its structural health over time, in 2010 the dam was instrumented with a continuous vibrations monitoring system, designed for Seismic and Structural Health Monitoring (SSHM), which includes 10 uniaxial accelerometers in the crest gallery and 3 triaxial accelerometers in the dam-foundation interface. The latest results on the dynamic behaviour monitoring of the dam are presented, namely the evolution of the main natural frequencies over time and the corresponding mode shapes. Then, HST statistical models for separation of effects, considering the hydrostatic pressure (H), seasonal variations (S), and time (T) dependent factors, are used to analyse the evolution of the experimental natural frequencies over the last 12 years. The achieved results show that the dynamic behaviour of the dam is mostly influenced by the water level variations. However, a very small decreasing tendency of the natural frequency values was detected, which may indicate a slight decrease of the global stiffness of the dam, possibly due to the evolution of the concrete swelling pathological process.<\/jats:p>","DOI":"10.1088\/1742-6596\/2647\/18\/182021","type":"journal-article","created":{"date-parts":[[2024,6,28]],"date-time":"2024-06-28T08:44:24Z","timestamp":1719564264000},"page":"182021","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Cahora Bassa vibrations monitoring between 2010-2022. Analysis of frequencies using HST statistical models for effects separation"],"prefix":"10.1088","volume":"2647","author":[{"given":"S","family":"Oliveira","sequence":"first","affiliation":[]},{"given":"P","family":"Mendes","sequence":"additional","affiliation":[]},{"given":"M","family":"Rodrigues","sequence":"additional","affiliation":[]},{"given":"A","family":"Alegre","sequence":"additional","affiliation":[]},{"given":"J","family":"Proen\u00e7a","sequence":"additional","affiliation":[]},{"given":"E","family":"Carvalho","sequence":"additional","affiliation":[]},{"given":"B","family":"Matsinhe","sequence":"additional","affiliation":[]}],"member":"266","reference":[{"key":"JPCS_2647_18_182021bib1","doi-asserted-by":"crossref","first-page":"1147","DOI":"10.1002\/eqe.55","article-title":"An experimental investigation of water level effects on the dynamic behaviour of a large arch dam","volume":"30","author":"Proulx","year":"2001","journal-title":"Earthquake Engineering and Structural Dynamics"},{"year":"2012","author":"Oliveira","key":"JPCS_2647_18_182021bib2"},{"year":"2019","author":"Alegre","key":"JPCS_2647_18_182021bib3"},{"year":"2012","author":"Okuma","key":"JPCS_2647_18_182021bib4"},{"year":"2017","author":"Ueshima","key":"JPCS_2647_18_182021bib5"},{"key":"JPCS_2647_18_182021bib6","doi-asserted-by":"publisher","first-page":"4483","DOI":"10.3390\/w14233835","article-title":"Seismic and structural health monitoring systems for large dams: theoretical, computational and practical innovations","volume":"20","author":"Oliveira","year":"2022","journal-title":"Bulletin of Earthquake Engineering"},{"year":"2022","author":"Alegre","key":"JPCS_2647_18_182021bib7"},{"year":"2015","author":"Brincker","key":"JPCS_2647_18_182021bib8"},{"year":"2021","author":"Alegre","key":"JPCS_2647_18_182021bib9"},{"year":"2000","author":"Peeters","key":"JPCS_2647_18_182021bib10"},{"year":"2000","author":"Brincker","key":"JPCS_2647_18_182021bib11"},{"key":"JPCS_2647_18_182021bib12","first-page":"475","article-title":"Influence du sol de fondation sur les d\u00e9formations du barrage de Rossens","volume":"3","author":"Gicot","year":"1955","journal-title":"Fifth International Congress on Large Dams"},{"key":"JPCS_2647_18_182021bib13","first-page":"989","article-title":"Sur les d\u00e9placements a la cl\u00e9 de l\u2019arc de couronnement du barrage de Pieve di Cadore","volume":"4","author":"Tonini","year":"1955","journal-title":"Fifth International Congress on Large Dams"},{"article-title":"Nota sobre a interpreta\u00e7\u00e3o dos resultados da observa\u00e7\u00e3o de barragens","year":"1956","author":"Rocha","key":"JPCS_2647_18_182021bib14"},{"key":"JPCS_2647_18_182021bib15","first-page":"149","article-title":"Displacement monitoring in Cabril dam using GNSS","volume":"31","author":"Rodrigues","year":"2021","journal-title":"Dam Engineering"},{"key":"JPCS_2647_18_182021bib16","first-page":"73","article-title":"Modelos h\u00edbridos de separa\u00e7\u00e3o de efeitos do tipo HSCT-FE para o estudo do comportamento de barragens ab\u00f3boda sob a\u00e7\u00f5es expansivas","volume":"3","author":"Rodrigues","year":"2022","journal-title":"Portuguese Journal of Structural Engineering"},{"year":"2000","author":"Oliveira","key":"JPCS_2647_18_182021bib17"},{"key":"JPCS_2647_18_182021bib18","first-page":"787","article-title":"Une m\u00e9thode d\u2019analyse des d\u00e9formations des barrages","volume":"4","author":"Gicot","year":"1976","journal-title":"Twelfth International Congress on Large Dams"},{"key":"JPCS_2647_18_182021bib19","first-page":"42","article-title":"Displacement forecasting for concrete dams","volume":"29","author":"Bonaldi","year":"1977","journal-title":"International Water Power and Dam Construction"},{"key":"JPCS_2647_18_182021bib20","first-page":"367","article-title":"Observation methods for controlling the safety and deterioration of concrete dams","volume":"2","author":"Pedro","year":"1979","journal-title":"Thirteenth International Congress on Large Dams"},{"key":"JPCS_2647_18_182021bib21","article-title":"Automatic observation and instantaneous control of dam safety. 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