Structural Design Specifications for Concrete Made with Laterite Rock as Coarse Aggregates

Author(s):  
Ephraim M.E. ◽  
Asigo P. M. M.
2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940032
Author(s):  
Sung-Youl Bae ◽  
Yun-Hae Kim

This paper presents a new design procedure for large wind turbine blades, which can be used in various case studies. The structural design of 2MW CFRP blade was performed using a verified 2MW GFRP blade model. The structural integrity assessment of the CFRP model demonstrated that the design criteria for tip deformation, buckling failure, and laminate failure in normal wind turbine operating conditions were met. The existing aero-elastic analysis code was not used to estimate the blade load, but the blade’s surface pressure was calculated using CFD. The conventional load analysis code necessitates the establishment of a turbine system and the input of structural characteristics with changes in the structural design specifications. However, when CFD was used to estimate the load, the turbine system was not required and the structure was evaluated against various design cases, making this a useful approach in preliminary design. This new structural design and evaluation procedure for wind blades can be used to review diverse design specifications in the initial design stage.


2001 ◽  
Vol 73 (3) ◽  
pp. 205-212 ◽  
Author(s):  
Engin Aktas ◽  
Fred Moses ◽  
Michel Ghosn

2016 ◽  
Vol 12 (1) ◽  
Author(s):  
Ariela Silva Torres ◽  
Vivian Michele Bandeira Da Silva

RESUMO: Reservatórios elevados são construções destinadas a receber água das estações de tratamento através das adutoras ou de reservatórios de maior volume apoiados ou enterrados e distribuí-la até os pontos de consumo. Esta estrutura tem como função principal condicionar e equalizar as pressões nas áreas de cotas topográficas mais altas que não podem ser abastecidas pelo reservatório principal. Este trabalho relata um estudo sobre as manifestações patológicas de reservatórios elevados executados em concreto armado na zona urbana da cidade de Pelotas, RS. A etapa de diagnóstico foi feita através de análise visual com registro fotográfico e após comparação com projeto estrutural cedido pelo órgão responsável pelo projeto. Por meio do estudo foi possível identificar manifestações patológicas do tipo: fissuras, sujidade, desplacamentos, corrosão de armaduras e lixiviação. Os resultados das análises das manifestações patológicas demonstraram que, além da falta de manutenção, as especificações de projeto, referentes aos estribos de pilares e vigas, foram decisivas na propagação da corrosão de armaduras, que estão expostas devido à ocorrência de cobrimentos em desacordo com os critérios atuais da norma NBR-6118 (ABNT, 2014) (Projeto de estruturas de concreto armado). O trabalho concluiu que o descaso do poder público com o estabelecimento de processos adequados de manutenção acelerou a degradação da estrutura e ocasionando assim a falha no funcionamento de abastecimento nos bairros que utilizam estes reservatórios. Desta maneira, este trabalho colaborou para o poder público iniciar o processo de estudo da etapa de manutenção destas edificações, com fim de favorecer a comunidade. ABSTRACT: Elevated tanks are buildings designed to receive water treatment plants through pipelines or supported bulk tanks or buried and distribute it to the points of consumption. This structure has the main function condition and equalize the pressures in the areas of highest topographic dimensions that can not be supplied by the main reservoir. This paper reports a study of the pathological manifestations of elevated tanks executed in reinforced concrete in the urban area of Pelotas, Brazil. The diagnostic stage was made by visual analysis with photographic record and after comparison with structural design given by the agency responsible for the project. Through the study it was possible to identify pathological manifestations like: cracks, dirt, spalling, corrosion of armor and leaching. The results of the analysis of pathological manifestations have shown that in addition to lack of maintenance, design specifications, referring to the stirrups of pillars and beams, were instrumental in the spread of corrosion of armor, which are exposed due to the occurrence coatings at odds with the current criteria of ISO-6118 standard (design of reinforced concrete structures). The study concluded that the indifference of the government to establish appropriate maintenance processes accelerated the degradation of the structure and thus causing a failure in supply operation in the districts using these reservoirs. Thus, this work contributed to the government to start the study process of maintaining these buildings stage in order to promote the community.


1983 ◽  
Vol 1983 (340) ◽  
pp. 39-47
Author(s):  
Minoru MATSUO ◽  
Yoshinori DEMURA ◽  
Tameo KOBORI

1985 ◽  
pp. 591-595
Author(s):  
Takashi CHOU ◽  
Minoru MATSUO ◽  
Yoshinori DEMURA ◽  
Tameo KOBORI

2011 ◽  
Vol 131 (3) ◽  
pp. 275-282
Author(s):  
Kenta Seki ◽  
Hiroaki Matsuura ◽  
Makoto Iwasaki ◽  
Hiromu Hirai ◽  
Soichi Tohyama

PCI Journal ◽  
1965 ◽  
Vol 10 (1) ◽  
pp. 91-94
Author(s):  
Felix Kulka

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.


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