Recent Submissions

  • Postbuckling Analysis of Functionally Graded Beams

    Soncco, K; Jorge, X; Arciniega, R (Institute of Physics Publishing, 2019-02-26)
    This paper studies the geometrically non-linear bending behavior of functionally graded beams subjected to buckling loads using the finite element method. The computational model is based on an improved first-order shear deformation theory for beams with five independent variables. The abstract finite element formulation is derived by means of the principle of virtual work. High-order nodal-spectral interpolation functions were utilized to approximate the field variables which minimizes the locking problem. The incremental/iterative solution technique of Newton's type is implemented to solve the nonlinear equations. The model is verified with benchmark problems available in the literature. The objective is to investigate the effect of volume fraction variation in the response of functionally graded beams made of ceramics and metals. As expected, the results show that transverse deflections vary significantly depending on the ceramic and metal combination.
  • An initial evaluation of a method for adopting kaizen events in the construction sector

    Arriola Oliveros B. (Potificia Universidad Catolica de Chile, 2018-04-01)
    Currently, construction companies have shown a need to adopt process improvement systems in order to function competitively in the market. However, civil construction, compared to the manufacturing, still has deficiencies relating to the incorporation of new improvement systems. Thus, the use of Kaizen Events (KE) is one of the main mechanisms used to perfect processes during the production (execution) phase of a product, ensuring enhanced performance and added value to the client. The present research sought to evaluate a method for adopting KE in the construction sector. The data-gathering tools used were a questionnaire and a focus group where academics and/or experts who fit a specific profile participated. A methodological strategy for the development of the work was adopted under the approach of Design Science Research (DSR) and the theoretical referential was developed from a Systematic Literature Review (SLR). Improvements were made to the method to improve its applicability and functionality in real life scenarios using the results obtained. Accordingly, the results show horizons for future research on KE in civil construction.
  • Additional results on integrals of beam eigenfunctions

    Morales, César A; Facultad de Ingeniería, Universidad Peruana de Ciencias Aplicadas, Lima, Perú (SAGE Publications Ltd, 2018-03-14)
    New simplest expression beam mode integrals are presented, including further simplifications and corrections of previous results; this type of integrals appear in computational methods in structural dynamics and vibrations of diverse structures and machines, and in aircraft dynamics methods.
  • Association between Perceived Risk and Training in the Construction Industry

    Universidad Peruana de Ciencias Aplicadas (UPC) (American Society of Civil Ingenieers, 2015-05)
    Acceso restringido temporalmente
  • Hermite–Lagrangian finite element formulation to study functionally graded sandwich beams

    Universidad Peruana de Ciencias Aplicadas (UPC) (Elsevier B.V., 2016-04)
    This paper presents a static analysis of functionally graded single and sandwich beams by using an efficient 7DOFs quasi-3D hybrid type theory. The governing equations are derived by employing the principle of virtual works in a weak form and solved by means of the Finite Element Method (FEM). A C1 cubic Hermite interpolation is used for the vertical deflection variables while C0 linear interpolation is employed for the other kinematics variables. Convergence rates are studied in order to validate the finite element technique. Numerical results of the present formulation are compared with analytical and FEM solutions available in the literature.
    Acceso restringido temporalmente
  • El riesgo percibido y la gestión de la seguridad

    Universidad Peruana de Ciencias Aplicadas (UPC) (2015-08-18)
    Introducción: El personal de emergencia convive habitualmente con riesgos inherentes a su profesión. Objetivos: Profundizar acerca del concepto del riesgo percibido como herramienta para gestionar el riesgo ocupacional. Materiales y métodos: El modelo utilizado para la cuantificación del riesgo ha sido el paradigma psicométrico. De esta forma, se realizaron encuestas anónimas en las diferentes estaciones de bomberos. El cuestionario contenía preguntas sociodemográficas, nueve preguntas acerca de distintos atributos del riesgo y una pregunta acerca de la percepción del riesgo en general del sujeto. Resultados: El análisis estadístico muestra dos grupos claramente diferenciados en cuanto a su percepción del riesgo, siendo uno de ellos caracterizado por tener sus integrantes una alta percepción del riesgo y el otro por tener una baja percepción del riesgo. Por último, se muestra que solamente el nivel educacional era una variable significativa en la explicación del riesgo percibido. Conclusiones: Los resultados son discutidos en función de la literatura existente concluyendo que se debe formar a los trabajadores para elevar su percepción del riesgo.
    Acceso abierto
  • The delay of consequences and perceived risk: an analysis from the workers' view point

    Universidad Peruana de Ciencias Aplicadas (UPC) (Universidad de Antioquia, 2015-06-03)
    This paper addresses the question of how construction workers perceive occupational risks. It is a question that has not been addressed in scientific research. Specifically, we answer the following research questions: what is the perception of risk of construction workers?; what aspects of risk significantly influence the formation of the overall perception of risk?; are there sociodemographic variables that help to understand the perception of risk of construction workers? and if this were the case, then what are these variables and how do they influence them?. Ultimately, it examines the profile of perceived risk, its relation to the delay of consequences and the influence of socio-demographic variables. Respondents filled out a questionnaire in the presence of the survey-taker. The questionnaire was based on the psychometric paradigm, and was comprised of: (a) nine questions, each exploring a perceived risk attribute or dimension rated on a Likert 7-point scale, (b) a question on global risk perception, and (c) categorical questions about socio-demographic issues. The survey was conducted in the city of Granada (Spain). A profile of the construction workers’ perceived risk was obtained. Answers to each attribute were above the neutral line (scores above four). The profile shows the risk dimension with the highest score was the delayed consequences of exposure to risk conditions, a dimension that can be related to ergonomics and occupational hygiene. This is a new outcome since traditionally this dimension was given a lower score in the worker’s perception. A simple linear regression showed global risk may be explained in terms of the delayed consequences dimension (R2=0.29). Finally, a variance analysis (ANOVA) and several t-tests explored the relationship between this dimension and the sample’s socio-demographic variables. To conclude, the delay of consequences is the risk dimension workers perceived as the most critical in their daily chores. In addition, this risk dimension is decisive in creating a high global risk perception. Parenthood, a higher worker category and training are the only socio-demographic variables having an impact on this dimension of perceived risk. Hence, there is a direct relationship between these two variables.
    Acceso abierto
  • Riesgo percibido en la construcción en España y Perú: un estudio exploratorio

    Universidad Peruana de Ciencias Aplicadas (UPC) (Universidad Industrial de Santander, 2015-05-07)
    Introducción: El sector de la construcción es uno de los más peligrosos. Se midió la percepción del riesgo que poseen los trabajadores de la construcción. La cultura puede afectar la percepción del riesgo. Objetivos: Dar a conocer el riesgo que perciben los trabajadores de la construcción en España y Perú, comparar y discutir las similitudes y diferencias entre países. Materiales y métodos: Estudio de carácter exploratorio transversal. Se utilizaron dos muestras de trabajadores: Españoles (N=204) y Peruanos (N=210) obtenidas en obras de edificación, obras civiles y centros de formación. El método de cuantificación es el paradigma psicométrico y su adaptación a la seguridad ocupacional de Portell & Solé en la NTP 578 del INSHT de España. Se utilizaron 9 atributos cualitativos del riesgo y un atributo cuantitativo global. Estos atributos se miden mediante escalas Likert de 1 a 7 puntos, mientras que el atributo cuantitativo global se mide mediante una escala de 1 a 100. Resultados: Los trabajadores de ambientes con riesgos potenciales o con maquinaria pesada tienen una percepción alta del riesgo. Los trabajadores de ambos países consideran que poseen suficiente conocimiento sobre la seguridad en el trabajo. Los trabajadores españoles consideran que sus responsables de seguridad y salud no poseen suficiente conocimiento, siendo mejor puntuados en Perú. La probabilidad de ocurrencia obtuvo baja puntuación. La medida cuantitativa global del riesgo no obtuvo diferencia estadísticamente significativa entre ambos países. Conclusiones: se debe estudiar el riesgo percibido en la construcción para mejorar las condiciones de salud de sus trabajadores.
    Acceso abierto
  • El riesgo percibido por el trabajador de la construcción: ¿qué rol juega el oficio?

    Rodríguez Garzón, Ignacio; Martínez Fiestas, Myriam; López Alonso, Monica; (Escuela de Construcción Civil de la Pontificia Universidad Católica de Chile, 2014-07-18)
    This article presents a study of the perceived risk in the construction sector. The study was conducted from the analysis of questionnaires from several samples of construction workers from southern Spain. We report the perceived risk profile obtained from the psychometric paradigm through qualitative attributes and then we analyze the results. Stands out the attribute regarding how work affects our own long-term health. This represents something new with respect to previous studies. Also analyzed by analysis of variance (ANOVA) the effects of socio-demographic variable craft with respect to the different attributes of the perceived risk of the questionnaire. It presents the differences obtained between the group of masons and framers.
    Acceso abierto