NMMR: Recent submissions

Now showing items 101-120 of 260

The role of modal parameters uncertainty estimation in automated modal identification, modal tracking and data normalization

Pereira, S.; Reynders, E.; Magalhães, F.; Cunha, A.; Gomes, J. P. (Elsevier, 2020-08)

During the last decade, many vibration-based structural health monitoring systems have been successfully implemented in different structures such as bridges, towers, stadia and wind turbines, with the aim of studying ...
Estudo das condições de fundação dos contrafortes da barragem do Caia

Silveira, A. F.; Peres Rodrigues, F.; Barroso, M. (1966-04)
Sistemas do tipo SSHM para monitorização sísmica e controlo da integridade estrutural de barragens de betão. Experiência do LNEC na última década

Oliveira, S.; Alegre, A. (IST, 2019)

Atualmente, o controlo da segurança de grandes barragens de betão tende a apoiar-se em sistemas de monitorização com Recolha Automática de Dados (RAD), incluindo a medição de grandezas para caracterização da resposta sob ...
Seismic analysis of an ultra-high arch dam using the 3DFE program DamDySSA3.0. Study on the influence of the reservoir water level

Alegre, A.; Oliveira, S.; Espada, M.; Câmara, R. (RPEE, 2019)

The seismic response of a 290 m high arch dam, located in a high seismicity zone in China, is studied in this paper. The goal is to evaluate the influence of the reservoir water level on the dam’s seismic behaviour. The ...
Análise sísmica de grandes barragens abóbada com base em modelos de EF3D. Aplicação ao caso de uma barragem com 290 metros de altura

Alegre, A.; Oliveira, S. (IST, 2019)

Neste trabalho efetuam-se estudos de simulação numérica da resposta sísmica de uma grande barragem abóbada, considerando uma dada lei de amortecimento de Rayleigh com vista a analisar a influência da cota da albufeira. A ...
Seismic and Structural Health Monitoring of Cabril dam. Software development for informed management

Oliveira, S.; Alegre, A. (Springer, 2020)

Nowadays, the management and safety control of large dams is generally based on automatic monitoring, including the socalled seismic and structural health monitoring systems (SSHM), using the latest technology for automatic ...
Seismic and structural health monitoring systems for large concrete dams

Oliveira, S.; Alegre, A. (Stanford University, 2019)

This paper is focused on the LNEC experience regarding the development and operation of continuous vibrations monitoring systems in large concrete dams. The goal is to emphasize the importance of the combined use of ...
Seismic and Structural Health Monitoring of Cabril dam

Oliveira, S.; Alegre, A. (LNEC, 2019)

This paper is focused on the Portuguese experience regarding the development and operation of continuous vibrations monitoring systems in large concrete dams. The goal is to emphasize the importance of the combined use of ...
Monitoring vibrations in large dams

Alegre, A.; Carvalho, E.; Matsinhe, B.; Mendes, P.; Oliveira, S.; Proença, J. (Hydro2019, 2019)

This paper focuses on studying the dynamic behaviour of large dams over time, including identification of modal parameters (natural frequencies, modal damping ratios and mode shapes) and seismic response analysis, based ...
Seismic and Structural Health Monitoring of Dams in Portugal

Oliveira, S.; Alegre, A. (Springer, 2019)

This chapter is focused on the Portuguese experience on the development and exploration of systems for continuously monitoring dam vibrations, using accelerometers. The pioneer system for seismic and structural health ...
Safety control of Aguieira dam using hybrid HSCT-FEM models

Rodrigues, M.; Oliveira, S.; Proença, J.; Alegre, A. (Hydro2019, 2019)

The safety control of dams under operation is based on the comparison between observed data, from monitoring systems, and numerical data from mathematical models developed to simulate/predict the dam behaviour over time. ...
Monitoring vibrations in large dams

Alegre, A.; Carvalho, E.; Matsinhe, B.; Mendes, P.; Oliveira, S.; Proença, J. (Aqua-Media International Ltd, 2020)

According to the general guidelines of the International Commission on Large Dams (ICOLD) regarding structural safety and health monitoring, the performance of dams under operational/ambient vibrations and during seismic ...
Development of DamDamage3D1.0. A MATLAB program for non-linear analysis of arch dams using a damage model

Alegre, A.; Oliveira, S. (LNEC, 2019)

The main goal of this report is to present DamDamage3D1.0, a 3D finite element-based program for non-linear static analysis of arch dams, developed using MATLAB. The non-linear simulations are performed using a damage law ...
Displacement monitoring in Cabril dam using GNSS

Rodrigues, M.; Oliveira, S.; Lima, J. N.; Proença, J. (LNEC, 2020)

The continuous displacement monitoring is essential for the safety control of large dams. It should be based on the comparison between numerical model results and monitoring data, e.g. observed displacements using plumb ...
Extended reality in the safety control of dams

Trindade,N.V.; Ferreira, A.; Oliveira, S. (LNEC, 2020)

Dam Safety Control has been at the front line of technology adoption in what concerns data acquisition. However, it does not take full advantage of the latest advancements when it comes to in-situ, real-time, information ...
Dynamic behavior of high arch dams under recorded seismic accelerograms. Study on the influence of reservoir water level

Alegre, A.; Oliveira, S.; Espada, M.; Câmara, R. (LNEC, 2019)

In this paper the seismic response of a large arch dam (290 m high), located in a high seismicity region, is analysed. The goal is to study the influence of the reservoir water level in the dam’s dynamic response under ...
Seismic analysis of Cabril dam. Measured response and comparison with numerical results from Code_Aster and DamDySSA

Alegre, A.; Robbe, E.; Oliveira, S. (LNEC, 2020)

This paper presents a study on the seismic response of the 132 m high Cabril arch dam, for an earthquake measured in-situ with the installed Seismic and Structural Health Monitoring system (in operation since 2008). The ...
Vibration monitoring of Cahora Bassa dam

Oliveira, S.; Carvalho, E.; Matsinhe, B.; Mendes, P.; Alegre, A.; Proença, J. (LNEC, 2020)

This paper focuses on the experience gathered from the continuous dynamic monitoring of Cahora Bassa dam, a 170 m high arch dam in Mozambique, over the past decade. The installed Seismic and Structural Health Monitoring ...
Non-linear seismic analysis of arch dams considering joint movements and a concrete damage model

Alegre, A.; Oliveira, S. (DW2020, 2020)

This paper presents a study on the non-linear seismic response of Cabril arch dam (Portugal), for a load combination including the dam’s self-weight, the hydrostatic pressure (full reservoir) and the seismic loading (10 s ...
Simulation of the in-plane structural behavior of unreinforced masonry walls and buildings using DEM

Pulatsu, B.; Erdogmus, E.; Lourenço, P.; Lemos, J. V. (Elsevier, 2020-08)

In this study, a novel computational modeling strategy is proposed to estimate the lateral load capacity and behavior of unreinforced masonry (URM) structures. All commonly noted failure mechanisms are captured via the ...

Now showing items 101-120 of 260

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