NMMR: Recent submissions

Now showing items 121-140 of 260

Numerical modeling of the tension stiffening in reinforced concrete members via discontinuum models

Pulatsu, B.; Erdogmus, E.; Lourenço, P.; Lemos, J. V. (Springer, 2020-06)

This study presents a numerical investigation on the fracture mechanism of tension stiffening phenomenon in reinforced concrete members. A novel approach using the discrete element method (DEM) is proposed, where ...
Discontinuum analysis of the fracture mechanism in masonry prisms and wallettes via discrete element method

Pulatsu, B.; Erdogmus, E.; Lourenço, P.; Lemos, J. V. (Springer, 2020-02)

This study proposes an alternative approach to modeling the failure mechanisms of brickwork assemblages under combined shear–compression, shear–tension (parallel to bed joints), and compression–flexural loadings using the ...
A Discrete Element Model for Masonry Vaults Strengthened with Externally Bonded Reinforcement

Gobbin, F.; De Felice, G.; Lemos, J. V. (Taylor & Francis, 2020-04)

The paper investigates the effectiveness of two-dimensional Discrete Element Method as a tool for structural analysis of arches provided with buttresses and backfill and strengthened with externally bonded reinforcement. ...
Stochastic strength prediction of masonry structures: a methodological approach or a way forward?

Sarhosis, V.; Lemos, J. V. (RILEM, 2020-01)

Today, there are several computational models to predict the mechanical behaviour of masonry structures subjected to external loading. Such models require the input of material parameters to describe the mechanical behaviour ...
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 the ...
Nonlinear dynamic response of stone masonry minarets under harmonic excitation

Cakti, E.; Saygili, O.; Lemos, J. V.; Oliveira, C.S. (Springer, 2020-06)

In this paper three historical masonry minarets in Istanbul, Turkey, are assessed for the dependency between the input harmonic motion and structural response parameters. Their heights are 40, 73 and 74 m, while the ...
sistemas de monitorização dinâmica de barragens de betão para apoio à avaliação da segurança estrutural

Gomes, J. P.; Lemos, J. V.; Pereira, S.; Magalhães, F.; Monteiro, G.; Pinho, P. (Plubindústria, 2020-01)

De acordo com a legislação portuguesa e tendo em consideração o risco sísmico da zona de construção das barragens é obrigatório a implementação de um Sistema de Observação Sísmica (SOS), incorporando instrumentação para ...
Characterization of the dynamic behavior of a concrete arch dam by means of forced vibration tests and numerical models

Gomes, J. P.; Lemos, J. V. (wiley, 2020-02)

The characterization of the dynamic behavior of an arch dam, and its evolution throughout the structure's lifetime, provides important data for the safety control process. Forced vibration tests remain a reliable technique ...
Seismic performance of historical buildings based on discrete element method: An adobe church

Mendes, N.; Lemos, J. V. (Taylor & Francis, 2018)

This article presents the main concepts and the application of the discrete element method (DEM) for evaluating the seismic performance of historical buildings. Furthermore, the out-of-plane behavior of an adobe church ...
Discrete element modeling of the seismic behavior of masonry construction

Lemos, J. V. (MDPI, 2019)

Discrete element models are a powerful tool for the analysis of masonry, given their ability to represent the discontinuous nature of these structures, and to simulate the most common deformation and failure modes. In ...
A discrete approach for modelling backfill material in masonry arch bridges

Sarhosis, V.; Lemos, J. V. (Elsevier, 2019)

Masonry arch bridges form a significant portion of the European transport infrastructure network. Many of these bridges are relatively old but still in service. Increasing vehicle loads and speeds have highlighted the need ...
Dynamic behaviour of ancient freestanding multi-drum and monolithic columns subjected to horizontal and vertical excitations

Sarhosis, V.; Lemos, J. V.; Milani, G. (Elsevier, 2019)

Earthquakes represent one of the major threats to cultural heritage monuments, such as classical ancient columns. Understanding the behaviour and dynamic response of such historic structures is useful for the assessment of ...
A detailed micro-modelling approach for the structural analysis of masonry assemblages

Sarhosis, V.; Lemos, J. V. (Elsevier, 2018)

Over the last 50 years, a significant amount of effort has been taken to develop numerical approaches and tools for the structural analysis of masonry. These range from considering masonry as an anisotropic continuum (ma ...
Contact representation in rigid block models of masonry

Lemos, J. V. (Inderscience Enterprises Ltd., 2017)

Abstract: Rigid block models are widely used in the analysis of masonry structures, as they provide a sound and efficient approximation of the observed behaviour, namely for modelling collapse modes that do not involve ...
Development of DamDamage3D1.0 - A MATLAB program for non-linear analysis of arch dams using a damage model

Alegre, A.; Oliveira, S. (2019-11)

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 ...
Seismic analysis of pine flat concrete dam. Comparison of numerical results from 2D and 3D analysis

Azevedo, N.; Braga Farinha, M. L.; Câmara, R.; Leitão, N. S. (Icold, 2019-09)

The concrete gravity dam proposed for the 15th International Benchmark Workshop on Numerical Analysis of dams (Theme A) was numerically studied using computational finite element modules developed by the authors for dam ...
Measurement of in situ stresses in the concrete of the Cahora Bassa dam

Lamas, L.; Gomes, J. P.; Carvalho, E.; Batista, A. L.; Matsinhe, B. (ICOLD 2019 Annual Meeting/Symposium, 2019)

The 166 m high Cahora Bassa arch dam, built in the Zambezi River in Mozambique more than 40 years ago, is undergoing a process of swelling reactions of the concrete, which has been accompanied since it was detected in its ...
Modelling dam-water dynamic interaction. numerical options and experimental validation

Lemos, J. V.; Gomes, J. P.; Pereira, S. (COMPDYN 2019 - 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 2019-06)

The safety evaluation of concrete arch dams requires validated numerical procedures capable of representing the dynamic interaction between the dam and the reservoir during a seismic event. The proposed numerical model ...
Modelação numérica e experimental da rotura pela fundação de barragens de betão para ações estáticas e dinâmicas

Gomes, J. P.; Lemos, J. V. (Associação Portuguesa de Análise Experimental de Tensões, 2018)

O dimensionamento de barragens, de acordo com a regulamentação portuguesa, engloba a verifica-ção da segurança da obra para diversos cenários de rotura. Nesta comunicação, apresenta-se um exemplo de aplicação conjunta de ...
Modelação do maciço rochoso para avaliação do comportamento de barragens de betão sujeitas a vibrações explosivas

Fonseca, R.; Gomes, J. P.; Lemos, J. V.; Resende, R. (Associação Brasileira de Mecânica dos Solos, 2018-09)

Pretende-se com este trabalho estudar o efeito das vibrações provocadas pelas explosões devidas a desmontes no comportamento da barragem de betão e respetiva fundação, avaliando a sua seguran-ça estrutural através de um ...

Now showing items 121-140 of 260

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