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Contribuição ao projeto e execução de lajes lisas nervuradas pré-fabricadas com vigotas treliçadas
(Universidade Federal de São Carlos, 2010-02-18) Avilla Junior, Jovair; Figueiredo Filho, Jasson Rodrigues de; https://lattes.cnpq.br/0732866094426766
The big surge in use of systems for flat slabs gave up the search for freedom in the definition and organization of architectural interior spaces in buildings. The design and construction of buildings on flat slabs, which allow great mobility in defining the internal space of the building and reducing its height. The slabs with prefabricated trussed beams using forms lost in blocks of expanded polystyrene (EPS) or removable forms, brought new perspectives to the design of flat slabs, allowing greater spans with low deadweight. The precast elements are lightweight, easy handling, transport and assembly, and require the use of molds and special equipment and requires little bracing. Computer programs have emerged in recent years provide more refined calculations that predict the behavior of the structure in service with greater precision. This way the designers have increased security in systems design less common as flat slabs ribbed, without internal beams, capitals and even edge beams. In Brazil the predominant culture in the design and implementation of flat slabs is given by the system option molded on site. The objectives of this study are: to seek answers to the prevailing cultural behavior, and to compare their advantages and disadvantages when compared with cast on site, presenting the normative regulations and simplified calculation method according to ABNT NBR 6118:2003, provide subsidies for the project and implementation of flat slabs with ribbed prefabricated trussed beams, provide a calculation method for the infinitely rigid diaphragm; present a real case study as a comparison of costs.
Uma arquitetura de comunicação oportunística
(Universidade Federal de São Carlos, 2010-02-18) Moschetto, Danilo Augusto; Guardia, Hélio Crestana; https://lattes.cnpq.br/1780902767520967; https://lattes.cnpq.br/0234923460537082
Mobile computing devices often present high processing power and include several wireless network interfaces. 4G networks promise to provide a unified IP based infrastructure with QoS and security support for the communications using such devices. Transmission delays, and network disruptions, however, are often common when considering the current transmissions of mobile users. This work presents a software communications architecture which is tolerant to transmission delays and intermittent connectivity by exploring a hop-by-hop forwarding mode in DTNs. The proposed architecture is organized as a set of functional layers, which allow the use of different forwarding policies and network technologies. By providing the forwarding of objects, named bundles, an unlimited number of high level communication applications can be implemented on top of the architecture. Security aspects concerning the proper identification of users and transmission bundles, as well as the confidentiality and authentication of the received information are considered in the project of the developed architecture. Log keeping of the bundle forwarding activities performed by the architecture, including the interactions among users and the data passing operations, may be further investigated for use in different context aware forwarding and social organization algorithms. A partial implementation of the developed architecture was made and the results demonstrate the viability of its operation.