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Prof. Moacir Kripka
University of Passo Fundo

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Research Keywords & Expertise

0 Optimisation
0 Optimization
0 Structural Analysis
0 Structures
0 Reinforced Concrete Structure

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Optimization
Structures
Structural Analysis

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Short Biography

B.Sc.in Civil Engineering at Catholic University of Rio Grande do Sul (1986), M.Sc.in Civil Engineering at Federal University of Rio de Janeiro (COPPE/UFRJ) in 1990) and D.Sc. in Civil Engineering at Engineering School of São Carlos of University of São Paulo (EESC/USP) in 1998. Visiting Professor at Polytechnic University of Valencia, Spain in 2018. Professor at University of Passo Fundo, Brazil, since 1991. Head of the Department of Civil Engineering (from 1991 to 1994 and from 1998 to 2000). Head of the Engineering Graduate Program from 2009 to 2013. Editor of Journal of Applied and Technological Sciences - CIATEC/UPF. Academic Editor of Journal of Advances in Civil Engineering. Editorial Board Member of Jornal of Advances in Computational Design and of International Journal of Structural Glass and Advanced Materials Research. Has experience in Civil Engineering, focusing on Mechanic of Structures, acting on the following subjects: optimization and structural analysis.

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Journal article
Published: 14 August 2021 in Sustainability
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Competition among companies is growing globally, with the need to increase productivity and efficiency in the product sector. However, there is also a growing concern about global warming and the depletion of natural resources, as well as their effects on human health. In this context, all human activities that involve intense usage of resources must take into account sustainability as one of the decision criteria. This work presents the application of decision-making methods to define the best product mix in the agricultural machinery industry. With this objective, the current schedule of the production line was identified, along with the production flow, by performing an inventory analysis and an environmental impact study (endpoint). A total of seven alternatives for the production mix of grain trailers were defined, considering different materials and production processes. The selection of the best schedule according to the different criteria was performed through the analytic hierarchy process (AHP) and data envelopment analysis (DEA) to evaluate the managerial implications for decision making. The results obtained through AHP identified a single alternative as being the best, which facilitates the decision making. The DEA method identified two alternatives as the most efficient, and in this case the manager can choose between a product mix that generates lesser environmental impact or greater profitability. Although applied to agricultural industry, the presented methodology can be easily adapted to other activities related to the built environment, such as construction industry.

ACS Style

Anderson Hoose; Víctor Yepes; Moacir Kripka. Selection of Production Mix in the Agricultural Machinery Industry Considering Sustainability in Decision Making. Sustainability 2021, 13, 9110 .

AMA Style

Anderson Hoose, Víctor Yepes, Moacir Kripka. Selection of Production Mix in the Agricultural Machinery Industry Considering Sustainability in Decision Making. Sustainability. 2021; 13 (16):9110.

Chicago/Turabian Style

Anderson Hoose; Víctor Yepes; Moacir Kripka. 2021. "Selection of Production Mix in the Agricultural Machinery Industry Considering Sustainability in Decision Making." Sustainability 13, no. 16: 9110.

Journal article
Published: 27 May 2021 in Applied Sciences
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At present, reducing the impact of the construction industry on the environment is the key to achieving sustainable development. Countries all over the world are using software systems for bridge environmental impact assessment. However, due to the complexity and discreteness of environmental factors in the construction industry, they are difficult to update and determine quickly, and there is a phenomenon of data missing in the database. Most of the lost data are optimized by Monte Carlo simulation, which greatly reduces the reliability and accuracy of the research results. This paper uses Bayesian advanced fuzzy mathematics theory to solve this problem. In the research, a Bayesian fuzzy mathematics evaluation and a multi-level sensitivity priority discrimination model are established, and the weights and membership degrees of influencing factors were defined to achieve comprehensive coverage of influencing factors. With the support of theoretical modelling, software analysis and fuzzy mathematics theory are used to comprehensively evaluate all the influencing factors of the five influencing stages in the entire life cycle of the bridge structure. The results show that the material manufacturing, maintenance, and operation of the bridge still produce environmental pollution; the main source of the emissions exceeds 53% of the total emissions. The effective impact factor reaches 3.01. At the end of the article, a big data sensitivity model was established. Through big data innovation and optimization analysis, traffic pollution emissions were reduced by 330 tonnes. Modeling of the comprehensive research model; application; clearly confirms the effectiveness and practicality of the Bayesian network fuzzy number comprehensive evaluation model in dealing with uncertain factors in the evaluation of the sustainable development of the construction industry. The research results have made important contributions to the realization of the sustainable development goals of the construction industry.

ACS Style

Zhi-Wu Zhou; Julián Alcalá; Moacir Kripka; Víctor Yepes. Life Cycle Assessment of Bridges Using Bayesian Networks and Fuzzy Mathematics. Applied Sciences 2021, 11, 4916 .

AMA Style

Zhi-Wu Zhou, Julián Alcalá, Moacir Kripka, Víctor Yepes. Life Cycle Assessment of Bridges Using Bayesian Networks and Fuzzy Mathematics. Applied Sciences. 2021; 11 (11):4916.

Chicago/Turabian Style

Zhi-Wu Zhou; Julián Alcalá; Moacir Kripka; Víctor Yepes. 2021. "Life Cycle Assessment of Bridges Using Bayesian Networks and Fuzzy Mathematics." Applied Sciences 11, no. 11: 4916.

Journal article
Published: 23 April 2021 in Sustainability
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Despite insufficient housing facilities, particularly in developing countries, construction systems are generally selected intuitively or based on conventional solutions sanctioned by practice. The present study aims to evaluate different options for the design of low-income housing in Brazil by integrating the life cycle assessment (LCA) into the decision-making process. To achieve this objective, three single-family projects with different construction systems were selected and analyzed. The most sustainable design was selected through the analytic hierarchy process (AHP). The considered parameters, which were obtained through a survey with professionals and customers, included cost, environmental impact, thermal comfort, construction time, and cultural acceptance. LCA and life cycle cost assessment (LCCA) were performed with the frontier’s system considering the cradle-to-gate cycle, which included the extraction of raw materials, manufacture of building materials, and housing construction. The projects were modelled using Autodesk Revit software with the Tally application for LCA evaluation. The results indicated that light steel frame houses present a better behavior than other conventional alternatives, and the integration of building information modelling with LCA and LCCA in the design phase can lead to the development of more sustainable houses.

ACS Style

Pollyanna Bianchi; Víctor Yepes; Paulo Vitorio; Moacir Kripka. Study of Alternatives for the Design of Sustainable Low-Income Housing in Brazil. Sustainability 2021, 13, 4757 .

AMA Style

Pollyanna Bianchi, Víctor Yepes, Paulo Vitorio, Moacir Kripka. Study of Alternatives for the Design of Sustainable Low-Income Housing in Brazil. Sustainability. 2021; 13 (9):4757.

Chicago/Turabian Style

Pollyanna Bianchi; Víctor Yepes; Paulo Vitorio; Moacir Kripka. 2021. "Study of Alternatives for the Design of Sustainable Low-Income Housing in Brazil." Sustainability 13, no. 9: 4757.

Journal article
Published: 06 April 2021 in Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica
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No projeto de uma edificação, a seleção do material estrutural mais adequado pode estar baseada em diversos fatores como custo, desempenho, disponibilidade e, mais recentemente, nos possíveis impactos ambientais produzidos. Uma forma de seleção da melhor alternativa com base em diversos critérios pode ser a utilização de técnicas de tomada de decisão. A análise de decisão multicritério padroniza o processo de tomada de decisão através de modelagem matemática, auxiliando o decisor a resolver problemas nos quais existem diversos objetivos a serem alcançados simultaneamente. Dentre os métodos existentes, um dos mais amplamente empregados é o Processo de Análise Hierárquica (Analytic Hierarchy Process, ou AHP) o qual é baseado na divisão do problema de decisão em níveis hierárquicos e na comparação pareada. O presente trabalho teve como objetivo apresentar uma metodologia para comparar três tipos de materiais estruturais, sendo eles concreto, aço e madeira, segundo critérios objetivos e subjetivos. Dentre os resultados obtidos constatou-se que, apesar do menor impacto ambiental atribuído à madeira, bem como da melhor resistência do aço, o concreto foi o material que apresentou a melhor pontuação total, principalmente devido ao menor custo e a questões culturais.

ACS Style

Leonardo Variani; Moacir Kripka. MÉTODO DE DECISÃO MULTICRITÉRIO APLICADO À SELEÇÃO DE MATERIAIS ESTRUTURAIS CONSIDERANDO O IMPACTO AMBIENTAL. Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica 2021, 14, 462 .

AMA Style

Leonardo Variani, Moacir Kripka. MÉTODO DE DECISÃO MULTICRITÉRIO APLICADO À SELEÇÃO DE MATERIAIS ESTRUTURAIS CONSIDERANDO O IMPACTO AMBIENTAL. Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica. 2021; 14 (1):462.

Chicago/Turabian Style

Leonardo Variani; Moacir Kripka. 2021. "MÉTODO DE DECISÃO MULTICRITÉRIO APLICADO À SELEÇÃO DE MATERIAIS ESTRUTURAIS CONSIDERANDO O IMPACTO AMBIENTAL." Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica 14, no. 1: 462.

Earlycite article
Published: 18 August 2020 in Engineering, Construction and Architectural Management
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Purpose The fair wage potential (FWP) is a social assessment method that can serve as an important measure to estimate the related social impacts along a product's life cycle; however, it does not admit a direct relation to the functional unit. This research presents the weighted fair wage potential (WFWP) method that relates the functional unit to the FWP. It is a simplified method to connect the material inventory to social data. This study aims to develop an approach to assess and choose the best construction typology for buildings based on the social sustainability of workers involved in the sectors. Design/methodology/approach The study is presented in phases. Phase 1 selected and identified two Brazilian house projects, which were considered for the following processes: extraction of raw materials, manufacture of building materials and housing construction. Phase 2 assembled the social life cycle inventories and executed them using the social life cycle assessment (SLCA). The inventory of materials followed the functional unit: “1.0 m² of the built housing”, and the social inventory observed data extracted from the National Household Sample Survey (PNAD). The study considered the stakeholder category “worker” and analysed the impact subcategory “fair salary”. The study also divided the social data into categories: worker gender, worker race/colour, worker union and worker formality to analyse the impact of subcategories: “equal opportunities/discrimination”, “freedom of association and collective bargaining” and “social benefits/social security”. Phase 3 compared the projects according to the results from the SLCA. The FWP considers the wage paid at supply chain sectors, and the WFWP relates the functional unit to the social data. Findings The results proved that the wages paid by the construction supply chain are fair. However, there are differences between the FWP of male and female workers, white and non-white workers, unionised and non-unionised workers and formal and informal workers. The study of the actual Brazilian minimum wage indicated that the FWP is sensitive to the reference wage to which the analysed wages paid are related. Considering the WFWP, the constructive typology employed in Project B can generate increased positive social impacts than Project A. The proposed study provides excellent results, and it can be adapted to different data to assess the social conditions of other countries and sectors. Research limitations/implications There is not enough primary data available for the variables real wages and real working time; for this reason, these variables received secondary data. Another limitation is the data used for the year range, since Brazilian microdata do not include years before 2002 and years beyond 2015. Originality/value The WFWP differs from the existing social sustainability studies because it relates the material information to social data; also, it defines the best option among the analysed alternatives, taking into consideration social sustainability, which enables the project design to go beyond technical aspects. The constructive typology and materials take into account the social sustainability of the construction supply chain, generating more sustainable projects and improving the circumstances of affected stakeholders.

ACS Style

Paulo Cezar Vitorio Junior; Moacir Kripka. Fair wage potential as a tool for social assessment in building projects. Engineering, Construction and Architectural Management 2020, 28, 1295 -1318.

AMA Style

Paulo Cezar Vitorio Junior, Moacir Kripka. Fair wage potential as a tool for social assessment in building projects. Engineering, Construction and Architectural Management. 2020; 28 (4):1295-1318.

Chicago/Turabian Style

Paulo Cezar Vitorio Junior; Moacir Kripka. 2020. "Fair wage potential as a tool for social assessment in building projects." Engineering, Construction and Architectural Management 28, no. 4: 1295-1318.

Journal article
Published: 22 June 2020 in International Journal of Environmental Research and Public Health
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The application of techniques to analyze sustainability in the life cycle of small-span bridge superstructures is presented in this work. The objective was to obtain environmental and economic indicators for integration into the decision-making process to minimize the environmental impact, reduce resource consumption and minimize life cycle costs. Twenty-seven configurations of small-span bridges (6 to 20 m) of the following types were analyzed: steel–concrete composite bridges, cast in situ reinforced concrete bridges, precast bridges and prestressed concrete bridges, comprising a total of 405 structures. Environmental impacts and costs were quantified via life cycle environmental assessment and life cycle cost analysis following the boundaries of systems from the extraction of materials to the end of bridge life (“from cradle to grave”). In general, the results indicated that the environmental performance of the bridges was significantly linked to the material selection and bridge configuration. In addition, the study enabled the identification of the products and processes with the greatest impact in order to subsidize the design of more sustainable structures and government policies.

ACS Style

Cleovir José Milani; Víctor Yepes; Moacir Kripka. Proposal of Sustainability Indicators for the Design of Small-Span Bridges. International Journal of Environmental Research and Public Health 2020, 17, 4488 .

AMA Style

Cleovir José Milani, Víctor Yepes, Moacir Kripka. Proposal of Sustainability Indicators for the Design of Small-Span Bridges. International Journal of Environmental Research and Public Health. 2020; 17 (12):4488.

Chicago/Turabian Style

Cleovir José Milani; Víctor Yepes; Moacir Kripka. 2020. "Proposal of Sustainability Indicators for the Design of Small-Span Bridges." International Journal of Environmental Research and Public Health 17, no. 12: 4488.

Journal article
Published: 06 April 2020 in Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica
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Em um ambiente edificado, a prática da sustentabilidade compete a todos os envolvidos no projeto e execução. A maior parte das medidas deve ser empregada na fase de projeto, uma vez que é nesta etapa que se tem as maiores implicações referente às dimensões, especificações e detalhes a serem incorporados à estrutura. Sendo assim, a identificação prévia e o estudo dos impactos gerados no ambiente possibilitam ao profissional, empresa ou órgãos públicos o desenvolvimento de planos de ações e soluções inovadoras, de forma que os impactos negativos sejam reduzidos. O presente artigo apresenta uma revisão da literatura técnica sobre as alternativas aplicáveis na fase de projeto que visam a minimização do impacto ambiental de estruturas de edifícios em concreto armado. Inicialmente é apresentado um breve histórico no que diz respeito à sustentabilidade, bem como uma contextualização do assunto, e posteriormente expõem-se os trabalhos relacionados à referida temática, no âmbito da engenharia civil, com ênfase no projeto estrutural. As alternativas propostas contemplam desde a função exercida por cada profissional na elaboração do projeto, estudos e aplicações sobre o concreto sustentável, abrangendo até a relação entre a otimização estrutural e os impactos ambientais em estruturas de concreto armado. A partir disso, conclui-se que compete ao projetista, diante destas opções disponíveis, verificar qual apresentará os melhores resultados, os menores gastos e os menores consumos de recursos, sejam de mão de obra, financeiros ou estruturais.

ACS Style

Andréia Fátima Tormen; Betina Knebel Muliterno; Moacir Kripka; Suéllen Tonatto Ferrazzo; Eduardo Pavan Korf. ESTUDOS SOBRE ALTERNATIVAS DE PROJETO PARA A MINIMIZAÇÃO DO IMPACTO AMBIENTAL DE EDIFÍCIOS EM CONCRETO ARMADO. Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica 2020, 13, 153 .

AMA Style

Andréia Fátima Tormen, Betina Knebel Muliterno, Moacir Kripka, Suéllen Tonatto Ferrazzo, Eduardo Pavan Korf. ESTUDOS SOBRE ALTERNATIVAS DE PROJETO PARA A MINIMIZAÇÃO DO IMPACTO AMBIENTAL DE EDIFÍCIOS EM CONCRETO ARMADO. Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica. 2020; 13 (1):153.

Chicago/Turabian Style

Andréia Fátima Tormen; Betina Knebel Muliterno; Moacir Kripka; Suéllen Tonatto Ferrazzo; Eduardo Pavan Korf. 2020. "ESTUDOS SOBRE ALTERNATIVAS DE PROJETO PARA A MINIMIZAÇÃO DO IMPACTO AMBIENTAL DE EDIFÍCIOS EM CONCRETO ARMADO." Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica 13, no. 1: 153.

Journal article
Published: 04 October 2019 in Engineering Structures
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Investigating the dynamic characteristics of slabs has become very important since modern structures, meeting economic needs and architectural tendencies, have been built lighter with longer open spans, and consequently became more susceptible to the phenomena of vibration. Therefore, addressing important parameters of vibration during the design phase of a building, such as natural frequencies and damping, can avoid vibrations problems in the future. This paper presents a research study that was undertaken to investigate the vibration parameters in waffle concrete slabs. Specifically, in situ experimental tests were carried out on twenty-six floor slabs using the heel-drop as impact source, accelerometer and mobile phone to register the natural frequencies and subsequently modal damping ratios. The natural frequencies were also obtained through the analytical calculations utilizing the numerical equations for isotropic and orthotropic plates, available in the literature. The results for fundamental frequencies show that mobile phones are effective for recording acceleration in floor slabs. Also, the two analytical methods studied in this research offered results that found to be in good agreement with the experimental ones; however, using the equations for orthotropic plates represented a more conservative alternative. As expected, natural frequencies of floor slabs tend to decrease with the increase of the span; however, the shorter span dimension seems to cause greater influence on the frequencies, especially in two-way slabs. For such two-way slabs, an exponential function can define the relationship between frequencies and the shorter open span dimension. Also, an exponential function that defines the relationship between frequencies and slab’s b/h ratio has been developed. As one of the outcomes of the study presented in this paper, it was found that using a loss factor of at least 3.4% for waffle slabs is a realistic assumption since this factor is influenced by the existence of non-structural components on the slab, e.g., partitioning walls.

ACS Style

Fernanda Scussiato Lago; Moacir Kripka; Osama (Sam) Salem; Zacarias M. Chamberlain Pravia. Experimental and analytical study of vibration parameters in waffle concrete slabs. Engineering Structures 2019, 199, 109593 .

AMA Style

Fernanda Scussiato Lago, Moacir Kripka, Osama (Sam) Salem, Zacarias M. Chamberlain Pravia. Experimental and analytical study of vibration parameters in waffle concrete slabs. Engineering Structures. 2019; 199 ():109593.

Chicago/Turabian Style

Fernanda Scussiato Lago; Moacir Kripka; Osama (Sam) Salem; Zacarias M. Chamberlain Pravia. 2019. "Experimental and analytical study of vibration parameters in waffle concrete slabs." Engineering Structures 199, no. : 109593.

Articles
Published: 11 September 2019 in Structure and Infrastructure Engineering
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This work applies life cycle sustainability assessment techniques in the superstructures of small-span bridges for rural and vicinal roads by integrating them into the decision-making process to include sustainability indicators. The study subsequently investigated the potential environmental impacts of three bridge configurations as proposed by Brazilian public agencies, including steel and concrete composite bridges, standard precast concrete bridges, and standard wood bridges. The life cycle assessment and the ReCiPe endpoint methodology were used for three damage categories -ecosystems, human health, and resources’ surplus costs- at the midpoint, and one potential impact category (global warming). The study was conducted using 27 bridges, including 11 precast concrete bridges, 13 steel and concrete composite bridges, and 3 wooden bridges. The best indexes were obtained in all categories for bridges composed of steel and concrete. The results reveal indexes that can serve as guides in bridge planning and construction, as this technique can be applied to several types of structures provided they have the same function to determine which is the most environmentally sustainable.

ACS Style

Cleovir José Milani; Moacir Kripka. Evaluation of short span bridge projects with a focus on sustainability. Structure and Infrastructure Engineering 2019, 16, 367 -380.

AMA Style

Cleovir José Milani, Moacir Kripka. Evaluation of short span bridge projects with a focus on sustainability. Structure and Infrastructure Engineering. 2019; 16 (2):367-380.

Chicago/Turabian Style

Cleovir José Milani; Moacir Kripka. 2019. "Evaluation of short span bridge projects with a focus on sustainability." Structure and Infrastructure Engineering 16, no. 2: 367-380.

Journal article
Published: 03 May 2019 in Automation in Construction
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In structural design, it is common practice to adopt the same cross-section dimensions for a group of elements. This procedure is mainly for practical and aesthetic reasons, as well as to reduce labour costs, but it also has a positive effect of reducing the number of variables, which simplifies the usual trial and error design process. On the other hand, the total materials cost obtained is closely related to this grouping. Based on this, the present work aims to minimize the cost of reinforced concrete plane frames considering the automated grouping of columns. To achieve this objective, an optimization software was developed by the association of matrix structural analysis, dimensioning and optimization. The sections dimensions, the area of steel and the concrete strength of beams and columns were taken as design variables. For a given maximum number of groups, the optimum grouping and the corresponding values to design variables are obtained. The strategy proposed in this paper to obtain the grouping reduces significantly the number of infeasible candidate solutions during the search process and avoid the proposition of unrealistic designs. For the optimization, a variant of the Harmony Search method was adopted. Some structures were analyzed in order to validate the application of the proposed formulation, as well as to verify the influence of the grouping of elements on the final results. In these structures, it was possible to observe a significant additional reduction in the total cost when automated grouping is performed regarding a uniform grouping, even when a small number of groups is considered. For the 20-floor building frame analyzed, the cost reduction from uniform to automated grouping varied from 5.53 to 7.35%. The influence of the concrete strength on optimal results was also investigated, indicating a cost reduction of 9.74% from best (40 MPa) to worst case (20 MPa). In general, it can be concluded that, when applied in conjunction with the usual design variables, the proposed procedure can enable a significant additional economy, without affecting the structural safety.

ACS Style

Juliana Triches Boscardin; Victor Yepes; Moacir Kripka. Optimization of reinforced concrete building frames with automated grouping of columns. Automation in Construction 2019, 104, 331 -340.

AMA Style

Juliana Triches Boscardin, Victor Yepes, Moacir Kripka. Optimization of reinforced concrete building frames with automated grouping of columns. Automation in Construction. 2019; 104 ():331-340.

Chicago/Turabian Style

Juliana Triches Boscardin; Victor Yepes; Moacir Kripka. 2019. "Optimization of reinforced concrete building frames with automated grouping of columns." Automation in Construction 104, no. : 331-340.

Editorial
Published: 02 May 2019 in Advances in Civil Engineering
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ACS Style

Tayfun DeDe; Murat Kankal; Ali Reza Vosoughi; Maksym Grzywiński; Moacir Kripka. Artificial Intelligence Applications in Civil Engineering. Advances in Civil Engineering 2019, 2019, 1 -3.

AMA Style

Tayfun DeDe, Murat Kankal, Ali Reza Vosoughi, Maksym Grzywiński, Moacir Kripka. Artificial Intelligence Applications in Civil Engineering. Advances in Civil Engineering. 2019; 2019 ():1-3.

Chicago/Turabian Style

Tayfun DeDe; Murat Kankal; Ali Reza Vosoughi; Maksym Grzywiński; Moacir Kripka. 2019. "Artificial Intelligence Applications in Civil Engineering." Advances in Civil Engineering 2019, no. : 1-3.

Journal article
Published: 02 March 2019 in Sustainability
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Owing to the elevated cost of bridges, especially when compared to the cost of roads, their rational design and material selection are fundamental properties to consider when aiming to reduce the environmental impacts and lengthen the lifespan of the bridge. Especially in developing countries, the construction of new bridges (mainly short spanned) is still a necessity, and it is important that these new structures are designed according to all the sustainability parameters, instead of being based only on the construction cost. Thus, the present work aims to study short-span bridges by integrating environmental assessments into the decision-making process. To achieve this goal, three short-span bridge designs, proposed by public organizations in Brazil, are evaluated: Precast concrete bridge, mixed concrete/steel bridge, and timber bridge. In order to allow comparison, the same location and span are considered. The structures are evaluated considering the following quantitative aspects: Cost of construction, assembly and material transportation, lifespan, and environmental impact (measured by the global warming potential, GWP). In addition, some more subjective factors are considered, such as the architecture (layout and appearance) and the user’s sensation of security. The selection is made by the adoption of two multi-criteria decision-making methods (analytic hierarchy process or AHP and Vikor). The results obtained with both methods indicate the mixed concrete/steel bridge as the most adequate alternative. Some additional analysis is performed in order to evaluate the influence of the qualitative aspects, as well as to study the importance of the variations in the costs on the results.

ACS Style

Moacir Kripka; Victor Yepes; Cleovir José Milani. Selection of Sustainable Short-Span Bridge Design in Brazil. Sustainability 2019, 11, 1307 .

AMA Style

Moacir Kripka, Victor Yepes, Cleovir José Milani. Selection of Sustainable Short-Span Bridge Design in Brazil. Sustainability. 2019; 11 (5):1307.

Chicago/Turabian Style

Moacir Kripka; Victor Yepes; Cleovir José Milani. 2019. "Selection of Sustainable Short-Span Bridge Design in Brazil." Sustainability 11, no. 5: 1307.

Journal article
Published: 11 October 2018 in Journal of Construction Engineering, Management & Innovation
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ACS Style

M. Kripka; G.A. Drehmer. Geometric optimization of steel trusses with parallel chords. Journal of Construction Engineering, Management & Innovation 2018, 1, 129 -138.

AMA Style

M. Kripka, G.A. Drehmer. Geometric optimization of steel trusses with parallel chords. Journal of Construction Engineering, Management & Innovation. 2018; 1 (3):129-138.

Chicago/Turabian Style

M. Kripka; G.A. Drehmer. 2018. "Geometric optimization of steel trusses with parallel chords." Journal of Construction Engineering, Management & Innovation 1, no. 3: 129-138.

Journal article
Published: 27 September 2018 in Exacta
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O gasto com o transporte para manutenção do sistema de iluminação pública representa custos elevados nos orçamentos municipais. A não racionalização das rotas podem acarretar maiores custos de manutenção e gerenciamento destes sistemas. Neste estudo foi realizada a otimização da roteirização dos veículos utilizados nos serviços de manutenção do sistema de iluminação pública da cidade de Passo Fundo (RS), aplicando-se o método do Problema do Caixeiro Viajante (PCV), a fim de se determinar os roteiros ótimos e ilustrar a importância dos métodos de otimização para resolução de problemas reais. Fez-se o a otimização das rotas por meio do programa computacional LINGO e obteve-se que as soluções ótimas apresentaram redução de 14,6 % nos percursos, o que resultaria na diminuição dos gastos com combustível, minimização do tempo percorrido e maior eficiência no atendimento, evidenciando a grande aplicabilidade e eficácia dos métodos de otimização na resolução de problemas reais e cotidianos.

ACS Style

Andréia Tormen; Gustavo Pansera; Moacir Kripka. Otimização das rotas para veículos de manutenção do sistema de iluminação pública na cidade de Passo Fundo (RS). Exacta 2018, 16, 1 .

AMA Style

Andréia Tormen, Gustavo Pansera, Moacir Kripka. Otimização das rotas para veículos de manutenção do sistema de iluminação pública na cidade de Passo Fundo (RS). Exacta. 2018; 16 (3):1.

Chicago/Turabian Style

Andréia Tormen; Gustavo Pansera; Moacir Kripka. 2018. "Otimização das rotas para veículos de manutenção do sistema de iluminação pública na cidade de Passo Fundo (RS)." Exacta 16, no. 3: 1.

Editorial
Published: 25 June 2018 in Advances in Civil Engineering
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ACS Style

Tayfun Dede; Moacir Kripka; Vedat Toğan; Victor Yepes; Ravipudi V. Rao. Advanced Optimization Techniques and Their Applications in Civil Engineering. Advances in Civil Engineering 2018, 2018, 1 -2.

AMA Style

Tayfun Dede, Moacir Kripka, Vedat Toğan, Victor Yepes, Ravipudi V. Rao. Advanced Optimization Techniques and Their Applications in Civil Engineering. Advances in Civil Engineering. 2018; 2018 ():1-2.

Chicago/Turabian Style

Tayfun Dede; Moacir Kripka; Vedat Toğan; Victor Yepes; Ravipudi V. Rao. 2018. "Advanced Optimization Techniques and Their Applications in Civil Engineering." Advances in Civil Engineering 2018, no. : 1-2.

Dissertation
Published: 10 April 2018 in Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha
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ACS Style

Moacir Kripka. Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha. Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha 2018, 1 .

AMA Style

Moacir Kripka. Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha. Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha. 2018; ():1.

Chicago/Turabian Style

Moacir Kripka. 2018. "Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha." Determinação do posicionamento ótimo dos apoios em edificações analisadas pelo modelo de grelha , no. : 1.

Journal article
Published: 02 April 2017 in Ciência & Engenharia
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Resumo O presente trabalho apresenta um estudo para a determinação do posicionamento otimizado dos apoios em pontes, bem como da relação ótima entre os vãos de vigas de pontes visando conduzir tanto a redução como a uniformização dos esforços nestas estruturas. O problema matemático foi formulado tendo como objetivo a minimização dos momentos fletores máximos, tendo como variáveis de projeto as coordenadas relativas de cada apoio interno. Na formulação as coordenadas nodais são canalizadas, uma vez que podem existir limitações à livre locação dos apoios. O programa desenvolvido com base neste estudo determina os esforços em cada apoio, para o deslocamento da carga ao longo da estrutura, a partir do Método dos Deslocamentos para análise de estruturas reticuladas, efetuando a otimização com o emprego de técnica de programação matemática. As estruturas analisadas a partir da implementação computacional do modelo idealizado apontam para a validação e eficiência do procedimento proposto. Palavras-chave: otimização, pontes, posicionamento dos apoios. OPTIMUM SUPPORT POSITIONS IN BRIDGES ABSTRACT This paper presents a study to determine the optimal support positions in bridges, as well as the optimal relation between the spans of beams, aiming both the reduction and the unifirmization of the efforts in these structures. The mathematical problem is formulated in order to minimize the maximum bending moments, taking the coordinate of each internal support as design variable. To take into account possible location limitations, size constraints are also considered in the formulation. The software developed based on this study determines the efforts in each support for load shifting along the structure by the usage of the Displacement Method, and the optimization is performed with a mathematical programming technique. The structures analyzed from the computational implementation of the idealized model point to the validation and efficiency of the proposed procedure. Keywords: optimization, bridges, support positions.

ACS Style

Moacir Kripka; Luttgardes De Oliveira Neto. Determinação do posicionamento ótimo de apoios em pontes. Ciência & Engenharia 2017, 22, 29 -36.

AMA Style

Moacir Kripka, Luttgardes De Oliveira Neto. Determinação do posicionamento ótimo de apoios em pontes. Ciência & Engenharia. 2017; 22 (2):29-36.

Chicago/Turabian Style

Moacir Kripka; Luttgardes De Oliveira Neto. 2017. "Determinação do posicionamento ótimo de apoios em pontes." Ciência & Engenharia 22, no. 2: 29-36.

Journal article
Published: 01 February 2017 in International Journal of Structural Glass and Advanced Materials Research
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Jair Frederico Santoro; Moacir Kripka. Studies on Environmental Impact Assessment of Reinforced Concrete in Different Life Cycle Phases. International Journal of Structural Glass and Advanced Materials Research 2017, 1, 32 -40.

AMA Style

Jair Frederico Santoro, Moacir Kripka. Studies on Environmental Impact Assessment of Reinforced Concrete in Different Life Cycle Phases. International Journal of Structural Glass and Advanced Materials Research. 2017; 1 (2):32-40.

Chicago/Turabian Style

Jair Frederico Santoro; Moacir Kripka. 2017. "Studies on Environmental Impact Assessment of Reinforced Concrete in Different Life Cycle Phases." International Journal of Structural Glass and Advanced Materials Research 1, no. 2: 32-40.

Journal article
Published: 25 January 2017 in Advances in Computational Design
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Guilherme F. Medeiros; Moacir Kripka. Modified harmony search and its application to cost minimization of RC columns. Advances in Computational Design 2017, 2, 1 -13.

AMA Style

Guilherme F. Medeiros, Moacir Kripka. Modified harmony search and its application to cost minimization of RC columns. Advances in Computational Design. 2017; 2 (1):1-13.

Chicago/Turabian Style

Guilherme F. Medeiros; Moacir Kripka. 2017. "Modified harmony search and its application to cost minimization of RC columns." Advances in Computational Design 2, no. 1: 1-13.

Proceedings article
Published: 01 January 2017 in XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering
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Guilherme Fleith De Medeiros; Moacir Kripka. Modified Improved Harmony Search: Proposta de melhorias para o algoritmo de otimização. XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering 2017, 1 .

AMA Style

Guilherme Fleith De Medeiros, Moacir Kripka. Modified Improved Harmony Search: Proposta de melhorias para o algoritmo de otimização. XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering. 2017; ():1.

Chicago/Turabian Style

Guilherme Fleith De Medeiros; Moacir Kripka. 2017. "Modified Improved Harmony Search: Proposta de melhorias para o algoritmo de otimização." XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering , no. : 1.