Navegando por Assunto "Obras públicas"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise da segurança e saúde do trabalho em canteiros de obras: estudo de caso em uma autarquia federal de ensino superior
(Universidade Federal do Pará, 2016-09-15) LIMA JÚNIOR, Moacir de Souza; NEVES, Renato Martins das; http://lattes.cnpq.br/6538317425557058
The research analysed public works buildings, members works in the construction sector has feature live with dangerous activities, being necessary preventive actions implementing practices of occupational health and safety, undertaking construction sites more productive, safe and healthy. In order to identify and propose actions to optimize the control of safety and health at work in the construction sites of public institution, was used the case study as a research methodology that had place the campus of the Federal University of Pará, a federal higher education authority; and that investigated the bidding process, the federal legislation, institutional documents, the conditions of construction sites and interviewed professionals of the institution and of the contractors. Checking evidence of imprudence on the part of contractors and deficiencies in the institution’s practices, which demonstrated that the institution needs, to improve and resize your staff to achieve success in the supervision the construction sites. The research was intended to stimulate the public administration to incorporate current practices demonstrating credibility and objectivity to the occupational safety and health performance in his works, preserving the institution as to the compliance with the current legislation and promote your visibility.
Acesso aberto (Open Access)
Análise das causas de aditivos de custo e de prazo em obras públicas de instituições federais de ensino
(Universidade Federal do Pará, 2019-03-19) ALVARENGA, Felipe Campos; MAUÉS, Luiz Maurício Furtado; http://lattes.cnpq.br/7497951647889934
Completing works within the cost and schedule stipulated in the planning phase is a major problem faced by managers in the construction industry. With this, several studies have been carried out around the world to identify the main reasons that lead to noncompliance with the works at the time and cost initially established. The present study aims to analyze the contractual additions made in public works of the Federal Institutions of Education (IFEs) and the main reasons that led to their conclusion. To achieve this goal, statistical tools were used to compare the cost and time changes between the country regions. The data of this work includes public construction projects divided in all the 5 regions of the Country, filtered from the database of the Ministry of Education. A diagnosis was made showing the percentage of additives among the regions and the main justifications of the same ones indicated in a sampling in this database. Statistical techniques such as the Kruskall-Wallis Analysis of Variance and the Mann-Whitney U-Test were used for data analysis and inference. As results, the differences in the distribution of time and cost additives were statistically significant among the regions, with the South and Central-West regions presenting the greatest differences and the North, Northeast and Southeast regions with a statistically similar behavior among them. Of the 2178 projects collected, 69.05% had additives of term and 61.89% of cost. The main factors that affect time and cost of the projects were the inclusions and / or modifications of design and the additions of services. The ways to reduce the incidence of overruns point to the use of Building Information Modeling (BIM) technology, lean construction and greater experience in the management of works.
Acesso aberto (Open Access)
Modelagem do “tempo de execução” de obras civis: estudo de caso na Universidade Federal do Pará (UFPA)
(Universidade Federal do Pará, 2010-12-06) COUTINHO, Lêda Sílvia de Aguiar Lédo; DUARTE, André Augusto Azevedo Montenegro; http://lattes.cnpq.br/1135221873341973; NEVES, Renato Martins das; http://lattes.cnpq.br/6538317425557058
The aim of this research is to propose a numerical model that treats the variable time so efficient and effective in order to meet the real needs of customers, users and society in general. However, was performed a survey bibliographic on public management, in respect of public works, statistics and operational research to the organizational system, aiming to numerical modeling. The research was based on quantitative methodologies, with emphasis on operational research for the study of public works performed under the management of PCU/UFPA. In developing the database, information was collected construction, renovations and expansions, implemented during the period 2006 to 2009, with the Permanent Commission for Bidding (CPL) and the Foundation that support the Research Development (FADESP). By linear regressions and after the transformed functions were obtained for the model prediction the statistical parameters: correlation coefficient (R) of 0.899, the coefficient of determination (R²) of 0.808, the coefficient of determination (adjusted R²) of 0.796 and error standard (Se) of 0.41. These parameters show a strong linearized correlation between the variables, indicating that 79.60% of the variability of time to execute a public work is caused or produced by variations together the area, the budgeted value, the operational capacity of IFES; operational capacity of the company; the type of service, and the season. With the results, it was concluded that it is possible to apply and implement the prognostic model for public works, considering that it is a powerful tool in its application to improvement of administrative procedures, both in structure and in its performance, whose main result is forecast variable “time of execution” for the performance of public enterprise.
Acesso aberto (Open Access)
Previsão de risco de atraso na execução de obras públicas por meio da lógica fuzzy: estudo de caso na cidade de Manaus
(Universidade Federal do Pará, 2021-09-22) VALENTE, Andrey Willen Nunes; NASCIMENTO, Manoel Henrique Reis; http://lattes.cnpq.br/0850846128967798
The occurrence of delays in public constructions is not uncommon, as their execution deadlines are often extrapolated, even though such deadlines are obtained through preliminary technical studies. The causes that originate such delays are varied, ranging from rainfall to increases in quantities of existing services or increases in new services. In this research, we sought to obtain a procedure, using fuzzy logic, to predict the risk of delay that some variables may cause in the period of execution of the work, allowing a public administration or a contracted company to adopt measures that they consider essential for mitigation of this delay. Initially, documentary and bibliographic research was carried out in order to identify the causes that most contribute to the occurrence of delays in the works. Once these causes were identified, the construction of the fuzzy inference system was started, with six of the most significant causes identified in the research being considered as linguistic variables, namely: the hiring factor, which corresponds to the quotient between the value of the proposal of the company and the amount budgeted by the administration; the value of the work, which is the value of the contract for the work; the executive design, which are the engineering designs used; the change in quantities, which are changes in the quantities of existing services or addition of new services; authorization from public agencies, which corresponds to the permission or support of any public agency or public company for the execution of the work; and the rain. For simulation of the created fuzzy inference system, real data from four public works were entered, and the answers of this simulation were satisfactory, due to the fact that they are confirmed by the documentation of the respective works. It is concluded that the system proved to be useful, as it was possible to predict the risk of delay in the execution of public works in the city of Manaus, and it can be used by both the public administration and the contractor to mitigate the causes of delays in the execution of public works.