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Repositorio DSpace at LNEC: Recent submissions

Now showing items 1921-1940 of 8548

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 ...
Considerations on the determination of measurements uncertainties values in laboratory airborne sound insulations measurements

Antunes, S.; Patrício, J.; Antonio, J.-; Falcão, A. (Sociedade Coreana de Acústica, 2020-08-23)

Due to the publication of the latest edition of ISO / IEC 17025 (2017 edition), the presentation of measurement uncertainty values associated with sound insulation tests, becomes an important requirement. Taking into account ...
Future trends in transport infrastructure monitoring

Fontul, S. (University of Zagreb, 2019-10-17)

The intense traffic on existing pavements not only induces increased deterioration but also decreases vailability of pavements for monitoring and maintenance interventions. In Europe, in general, the existing pavement ...
Assessoria técnica aos processos de reabilitação ambiental relacionados com a utilização da Base das Lajes pelos EUA - Parecer sobre os materiais a utilizar para a instalação de novas redes de abastecimento de água em zonas com solos potencialmente contaminados e análise de solos no traçado previsto para o sistema de abastecimento a Santa Rita

Antunes, M. L.; Real, L. P.; Leitão, T. E. (2020-08)

O LNEC encontra-se a prestar assessoria ao Ministério da Defesa Nacional (MDN) num conjunto de questões técnico-ambientais suscitadas pela presença, nos últimos 60 anos, do contingente da Força Aérea Americana (USAFE) na ...
Project UBEST: Understanding the biogeochemical buffering capacity of estuaries relative to climate change and anthropogenic inputs - Final Report

Rodrigues, M.; Fortunato, A. B.; Martins, R.; Rogeiro, J.; Oliveira, A.; Azevedo, A.; Freire, P.; Cravo, A.; Jacob, J.; Rosa, A. (2020-08)

The final technical report of the project “UBEST – Understanding the biogeochemical buffering capacity of estuaries relative to climate change and anthropogenic inputs” (ref. PTDC/AAGMAA/ 6899/2014), funded by the Portuguese ...
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 ...
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 ...
Low-density cardoon (Cynara cardunculus L.) particleboards bound with potato starch-based adhesive

Monteiro, S.; Lina Nunes; Martins, J.; Magalhães, F.; Carvalho, L. (MDPI Initiatives, 2020-08-11)

In the present work, and for the first time, totally biosourced low-density particleboards were produced using cardoon particles (a no added value by-product from the Portuguese cheese making industry), bound with a potato ...
Transient-Flow Induced Compressed Air Energy Storage (TI-CAES) System towards New Energy Concept

Besharat, M.; Dadfar, A.; Viseu, T.; Brounone, B.; Ramos, H. (MDPI, 2020-02)

In recent years, interest has increased in new renewable energy solutions for climate change mitigation and increasing the efficiency and sustainability of water systems. Hydropower still has the biggest share due to its ...
Risk-based methodology for scour analysis at bridge foundations

Bento, A. M.; Gomes, A.; Viseu, T.; Couto, L. T.; Pêgo, J. P. (Elsevier, 2020-07)

The collapse of bridges inevitably leads to economical losses and may also be responsible for human fatalities. A bridge may fail due to several reasons, with local scouring around its foundation being the most common. ...
Experiences with SWASH on modelling wave propagation over vegetation: comparisons with lab and field data

Reis, R.; Pires Silva, A.; Fortes, C. J. E. M.; Suzuki , T. (APRH, 2020-08)

The vegetation capacity to protect the coasts from wave action is becoming more important and attractive due to ongoing sea level rise and increasing storminess. In addition, it is a quite environmentally friendly way. ...
A methodology for the evaluation of evolution and risk of breakwaters. Application to Portimão harbor and of Faro-Olhão inlet

Lemos, R.; Capitão, R.; Fortes, C. J. E. M.; Henriques, M. J.; Silva, L. G.; Martins, T. (APRH, 2020-08)

This paper describes a program under the responsibility of LNEC for the systematic observation and monitoring of maritime works that has successfully been applied to a number of maritime structures on the Portuguese mainland ...
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 ...
Evaluation of the European Legislative Framework in Assessing the Vulnerability of Surface and Groundwater Bodies to Road Runoff

Martins, T.; Leitão, T. E.; Lundy, L. (VTGU Press, 2020-05)

This article presents an overview of the current European practices with regards to protecting surface water and groundwater bodies, in what concerns the application of legislation to protect water resources and to evaluate ...

Now showing items 1921-1940 of 8548

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