Installation and results from the first 6 months of operation of the dynamic monitoring system of Baixo Sabor arch dam

Pereira, Sérgio; Magalhães, Filipe; Gomes, Jorge; Cunha, Álvaro; Lemos, José V.

doi:10.1016/j.proeng.2017.09.165

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…In Portugal, the continuous dynamic monitoring of large concrete dams started in 2008, in the scope of a pioneer project (Oliveira, 2002) for the development and installation of a SSHM system in Cabril to continuously measure vibrations in normal operating conditions and during seismic events (Mendes, 2010), which was funded by the Portuguese Foundation for Science and Technology (FCT) and supported byEnergias de Portugal (EDP). In light of the success achieved with Cabril dam and of the valuable results obtained in various studies (Alegre, Carvalho, et al, 2019;Alegre, Robbe, et al, 2020;Oliveira et al, 2012Oliveira et al, , 2014, 2018, the decision was made to invest in the installation of similar SSHM system at BaixoSabor dam (Gomes et al, 2018;Pereira et al, 2017)and Foz Tua dam (Pereira et al, 2021;Silva Matos et al, 2019), as well as of trigger-event type systems for measuring seismic vibrations in Alqueva, Alto Ceira II and Ribeiradio dams.…”

Section: The Role Of Sshm Systems In the Safety Control Of Large Concrete Damsmentioning

confidence: 99%

Seismic and Structural Health Monitoring Systems For Large Dams: Theoretical, Computational and Practical Innovations

Oliveira¹,

Alegre²,

Carvalho³

et al. 2021

Preprint

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Over the past decade, monitoring systems for Seismic and Structural Health Monitoring (SSHM) have been assuming a greater role in the safety control of large concrete dams. In this article, the dynamic behavior of two large arch dams equipped with SSHM systems is analyzed, in order to present some of the main theoretical, computational and practical innovations developed recently for the improvement of large dams’ continuous dynamic monitoring using SSHM systems. The case studies are two large arch dams that have been under continuous dynamic monitoring over the last ten years: Cabril dam (132 m high), the highest dam in Portugal, and Cahora Bassa dam (170 m high), located in Mozambique, one of the highest dams in Africa. The Seismic and Structural Health Monitoring (SSHM) systems installed in both dams have similar schemes and were designed to continuously record acceleration time series in several locations at the upper part of the dam body and near the dam-foundation interface, using uniaxial and triaxial accelerometers. Specific software was developed for monitoring data analysis, including automatic modal identification, to obtain natural frequencies and mode shapes, for automatic detection of vibrations induced by seismic events, to be distinguished by those caused by other operational sources, and for comparison between results retrieved from measured vibrations and numerical results obtained from computational 3DFE models. The numerical analyses are carried out using a 3DFE program for linear and non-linear dynamic analysis of concrete dams, based on a solid-fluid coupled formulation to simulate the dam-reservoir-foundation system, considering the dam-water dynamic interaction and the propagation of pressure waves throughout the reservoir. The most significant experimental results from continuous dynamic monitoring are presented for Cabril dam and Cahora Bassa dam and compared with numerical results, with emphasis on the evolution of natural frequencies over time, on vibration mode shapes for various water levels, and, finally, on the measured accelerations during seismic events. Furthermore, the main results of non-linear seismic response simulations, considering joint movements and concrete damage, are also presented for both dams in order to assess their seismic performance, using an intensifying seismic accelerogram prepared for Endurance Time Analysis.

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Section: The Role Of Sshm Systems In the Safety Control Of Large Concrete Damsmentioning

confidence: 99%

Seismic and Structural Health Monitoring Systems For Large Dams: Theoretical, Computational and Practical Innovations

Oliveira¹,

Alegre²,

Carvalho³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Yet, the possibility to continuously track the structural health of the system under observation without resorting to any invasive technique has further encouraged the application of SHM to historical constructions and monuments, despite the numerous challenges associated with such complex and unconventional artefacts. Trying to cover emblematic examples of SHM over the Portuguese territory, the following applications can be mentioned: Pedro e Inês footbridge (Caetano et al, 2010), Braga Stadium suspension roof (Martins et al, 2014), Foz Tua centenary railway bridge (Magalhães et al 2016), Infante D. Henrique bridge (Magalhães et al 2012), Mogadouro clock tower (Ramos et al2010), Jeronimos church (Masciotta et al, 2016), Saint Torcato church (Masciotta et al, 2017), Baixo Sabor arch dam (Pereira et al, 2017), Foz Côa church (Mesquita et al, 2018). SHM systems also result particularly attractive for advanced seismic protection of critical structures located in earthquake-prone areas, given their potential for real-time structural assessment and early warning of seismic damage.…”

Section: Seismic Shm and Testing For Cultural Heritage In Portugalmentioning

confidence: 99%

S2HM in Some European Countries

Limongelli

Dolce

Spina

et al. 2019

Seismic Structural Health Monitoring

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This paper compiles and describes the national initiatives and projects on seismic Structural Health Monitoring (SHM) active in a number of European countries. Sensors networks and typical layouts, data processing techniques and policies adopted for the management of alerts are described for the different national programs. The different policies adopted for the access to data are also described. For the different countries applications to buildings, bridges or cultural heritage constructions are used to describe in detail the SHM systems installed in Italy, France, Greece and Portugal.

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“…The objective fact is, the sizes of the arch dams are huge and the working environments where arch dams located are harsh, indicating particular excitations are extremely difficult to be applied on arch dams for detecting seismic damage in transverse joints. Fortunately, many existing arch dams have installed completed structural health monitoring systems [41,42], with which the seismic responses of the arch dams can be recorded. The dynamic responses of the arch dams, especially the dynamic responses near the transverse joints contain information about the damage.…”

Section: Introductionmentioning

confidence: 99%

A novel method for identifying damage in transverse joints of arch dams from seismic responses based on the feature of local dynamic continuity interruption

Wei

Shen

Cao

et al. 2023

Smart Mater. Struct.

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Without the difficulty of applying particular excitations on arch dams, a method using the correlation coefficients of time-scale representations (CCTSRs) of seismic responses to identify the damage in transverse joints is proposed. The identification of damage using the CCTSR method is characterized by comparing the time-scale representations (TSRs) of paired seismic accelerations measured from two neighbouring points crossing the transverse joints horizontally. With the CCTSR method, the TSRs of measured seismic accelerations are produced with the continuous wavelet transform; the comparison of the TSRs is carried out by calculating the correlation coefficients. The correlation coefficients of the paired TSRs are combined with the defined damage intervals to evaluate the positions and severities of the damage. The method’s feasibility is numerically verified via the identification of the damage in transverse joints by discussing the effects of the wavelet functions, seismic excitations, and noise resistance. The method’s effectiveness is experimentally validated via the detection of the damage in transverse joints of a scaled arch dam model subjected to artificial seismic loads. The proposed CCTSR method can localize the positions of various damage scenarios and quantify the damage severities caused by progressive seismic loads.

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Installation and results from the first 6 months of operation of the dynamic monitoring system of Baixo Sabor arch dam

Cited by 9 publications

References 3 publications

Seismic and Structural Health Monitoring Systems For Large Dams: Theoretical, Computational and Practical Innovations

Seismic and Structural Health Monitoring Systems For Large Dams: Theoretical, Computational and Practical Innovations

S2HM in Some European Countries

A novel method for identifying damage in transverse joints of arch dams from seismic responses based on the feature of local dynamic continuity interruption

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