Navegando por Orientadores "BAYMA, Rafael Suzuki"

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Acesso aberto (Open Access)
Aplicação de técnicas de identificação de sistemas para previsão de resistência à punção em lajes lisas de concreto armado sem armadura de cisalhamento
(Universidade Federal do Pará, 2019-02-27) AMORIM, Fábio de Oliveira; FERREIRA, Maurício de Pina; http://lattes.cnpq.br/4242041552985485; BAYMA, Rafael Suzuki; http://lattes.cnpq.br/6240525080111166
The structural systems used in reinforced concrete pavements, in which the slabs rest directly on the pillars, without the use of beams, have, among their characteristics, the existence of high concentrated stresses in the slab-pillar connections. These tensions can cause these connections to rupture and cause the structure to collapse progressively. This is called a punching. As the breakage of the punching bonds is fragile, without warning, it is extremely important that the bond strength is checked. For the study in question, information was collected from two databases of several authors who performed experimental tests on plain slabs of reinforced concrete without shear reinforcement, containing several parameters used in the tests, as well as punching resistance values. A lot of studies were developed with the purpose of defining and standardizing procedures and mathematical functions that satisfactorily represented the phenomenon of punching in function of its various parameters of influence. In this way, calculation models and normative instructions have been developed that can be used for the study and development of the subject. Besides, some studies were developed with the rescue of numerical techniques and systems identification, resulting in equations that aim to represent the punching phenomenon satisfactorily. The present work aims to obtain a mathematical function that represents the phenomenon of punching in slabs without shear reinforcement by means of their strain strength, or even group of functions, if this is the case. Therefore, it was possible to propose improvements in the equations present in the norms. The results show that it is possible to predict new mathematical models that describe the phenomenon of punching by means of systems identification techniques. The results also show that it is possible to propose better mathematical models when evaluating better performance metrics than the equations derived from normative data through statistical data. Thus, it is concluded that new mathematical models can serve as reference for engineers of the area of structures and researchers of related areas.
Acesso aberto (Open Access)
Construção de um protótipo de barco robô de baixo custo para análise de qualidade de água em rios e reservatórios
(Universidade Federal do Pará, 2020) MARTINS, Leandro Ramos; BAYMA, Rafael Suzuki; http://lattes.cnpq.br/6240525080111166
The National Water Agency, through its National Water Quality Assessment Program, operates a monitoring network with 1874 data recording points throughout the national territory together with the states, where the analysis of four basic parameters is carried out. According to the National Water Agency, the number of points is insufficient for the monitoring of the quality of the water in the lakes and river to be assessed throughout their course, which promotes the lack of data and information, generating gaps in the monitoring that are not can reverse. One option that is under development to solve this problem that is not exclusive to Brazil, is the use of robot boats, which has shown to be a promising technology. This work proposes the construction of a robot boat prototype for low-cost water quality analysis, and promotes the analysis of the use of robotic vessels in order to assist the activities of collecting and analyzing water quality in order to facilitate and streamline monitoring. The prototype developed included the use of low-cost technologies in its design and mechanical, electrical and electronic assembly in addition to the human machine interface. The robot boat was tested on bench and in the field, obtaining satisfactory results for the measurements of ph, temperature and collection, refrigeration and transport of water samples, a function not observed in other robot boat projects.