1,721,011 research outputs found
A comparative study of the construction management of a residential complex in Russia and Spain
No full textThe influence of project management in construction industry has been increased
significantly in recent years due to development of various management tools, such
as BIM for instance.
Nevertheless, all technological innovations and developments are based on a
fundamental knowledge and skills in this area, such as: correct scope, time, cost and
quality management. The previously mentioned skills are widely known, described in
detail and employed in a varying degree all over the world.
However, the results of project planning that have been achieved, albeit in the exact
same manor may vary greatly throughout the world due to parameters in standard
databases in different countries, such as activity costs, established workforce
performance and formation of the crews.
The task of this research is to develop an economical, cost and time planning for the
execution of construction for the residential estate, according to the fundamental
management tools based on the Russian and Spanish standard databases, in order to
examine the distinct differences between said databases
Fibre reinforced concrete column-supported flat slabs : from material and structural characterization to design and economic optimization
Get PDFTesi en modalitat de compendi de publicacionsFibre reinforced concrete (FRC) has proven to be a suitable material for statically indeterminate elements. The FRC column-supported flat slabs with partial or even total substitution of reinforcing steel bars constructed within the scope of this thesis provided the positive outcomes from both technical and sustainability perspectives, being a supporting evidence for this statement. Despite the successful experiences of FRC slab construction, the widespread use of this technology is still hindered because of a number of factors related to the general comprehension of the material’s properties, design procedure, and accurate assessment of both technological and economic aspects.
In this context, further research is required to complement the current scope of knowledge, providing to practitioners and researchers a clear example of structural capacity of FRC column-supported flat slabs. Moreover, straightforward procedures focused on the design and following evaluation of the potential technological and economic benefits due to use of FRC should be de-rived. Therefore, a rather comprehensive doctoral thesis that covers the majority of the above-mentioned topics is proposed herein.
The first part of the study focuses on the material characterization and analysis of the flexural behavior of FRC column-supported flat slab. A full-scale FRC slab was constructed and tested under different load magnitudes, assessing the structural response at both ultimate and serviceability limit states. The results derived proved the sufficient flexural strength at ultimate conditions along with the capacity of moment redistribution and the ductility of the system. Furthermore, the studied FRC slab evidenced the acceptable performance in terms of cracking and deflections.
Subsequently, the straightforward design-oriented method is proposed to estimate the structural response of FRC column-supported flat slabs in terms of flexural strength, cracking control, and instantaneous deformations. The results derived were compared with a nonlinear analysis, highlighting a suitable accuracy and precision of the proposed approach. Finally, an industrial-oriented study was carried out with the main objective of elaborating a simplified method for the preliminary comparison of traditional and FRC solutions for column-supported flat slabs in terms of economic benefits. The results reflected an increment of direct costs for both fibre and hybrid (fibre + reinforcing steel bars, HFRC) solutions; however, these increments can be compensated by the reduction of the construction period and, as a consequence, time-dependent costs (i.e. preliminaries, equipment costs, overheads, and finance costs).El hormigón reforzado con fibras (HRF) ha demostrado ser un material adecuado para elementos sujetos a condiciones de contorno que conducen a hiperestaticidad. La construcción de forjados de HRF soportados por pilares ha proporcionado resultados positivos tanto desde el punto de vista técnico como de la sostenibilidad. A pesar de las experiencias de éxito en la sustitución parcial o incluso total del refuerzo tradicional (barras de acero) por fibras, el uso de esta tecnología todavía sigue siendo limitada debido a una serie de factores relacionados con la compresión general de las propiedades de HRF, los métodos de diseño junto con el análisis de los aspectos tecnológicos y económicos. En este contexto, se hace necesario continuar investigando el comportamiento de las losas bidireccionales de HRF con el objeto de complementar el marco actual de conocimiento, proporcionando a los profesionales evidencias de la capacidad estructural de este tipo de elementos. Además, la industria requiere los métodos de diseño prácticos junto con herramientas para llevar a cabo el análisis comparativo de diferentes soluciones en términos de beneficios tecnológicos y económicos. Por este motivo, se plantea una tesis doctoral generalista que abarca la mayoría de los temas mencionados en el ámbito de la tecnología de los forjados de losa maciza de hormigón reforzado con fibras. La primera parte del estudio se enfoca en la caracterización del material y posterior análisis del comportamiento a flexión de un forjado de HRF soportado por pilares. Para ello, se ha construido y ensayado una losa a escala real bajo diferentes magnitudes de carga, evaluando la res-puesta estructural del elemento en estado límite de servicio y último. Los resultados obtenidos han mostrado la suficiente resistencia a flexión bajo las cargas últimas junto con una elevada ductilidad y capacidad de redistribuir los esfuerzos en el sistema hiperestático. Asimismo, la losa de HRF analizada ha cumplido con los requisitos del estado límite de fisuración y de deformaciones. Posteriormente, se propone un método de diseño analítico para estimar la respuesta estructural de las losas de HRF soportadas por pilares en términos de resistencia a flexión, control de fisuración y de deformaciones instantáneas. Los resultados derivados se compararon con un análisis no lineal mediante el método de los elementos finitos, destacando una precisión adecua-da desde el punto de vista ingenieril del método propuesto. En la última parte se presenta un método simplificado para llevar a cabo un análisis comparativo de soluciones tradicionales y de HRF para las losas apoyadas sobre pilares en términos eco-nómicos. Los resultados del estudio comparativo demostraron un incremento de los costes directos para las soluciones con fibra (sustitución parcial o total del refuerzo tradicional); sin embargo, este incremento de los costes puede compensarse debido a la reducción del periodo de construcción y, como consecuencia, reducción de los costes indirectos (costes de maquinaria y herramientas, gastos de administración y dirección técnica, costes financieros).Enginyeria de la construccióDOCTORAT EN ENGINYERIA DE LA CONSTRUCCIÓ (Pla 2012
A comparative study of the construction management of a residential complex in Russia and Spain
No full textThe influence of project management in construction industry has been increased
significantly in recent years due to development of various management tools, such
as BIM for instance.
Nevertheless, all technological innovations and developments are based on a
fundamental knowledge and skills in this area, such as: correct scope, time, cost and
quality management. The previously mentioned skills are widely known, described in
detail and employed in a varying degree all over the world.
However, the results of project planning that have been achieved, albeit in the exact
same manor may vary greatly throughout the world due to parameters in standard
databases in different countries, such as activity costs, established workforce
performance and formation of the crews.
The task of this research is to develop an economical, cost and time planning for the
execution of construction for the residential estate, according to the fundamental
management tools based on the Russian and Spanish standard databases, in order to
examine the distinct differences between said databases
A comparative study of the construction management of a residential complex in Russia and Spain
No full textThe influence of project management in construction industry has been increased
significantly in recent years due to development of various management tools, such
as BIM for instance.
Nevertheless, all technological innovations and developments are based on a
fundamental knowledge and skills in this area, such as: correct scope, time, cost and
quality management. The previously mentioned skills are widely known, described in
detail and employed in a varying degree all over the world.
However, the results of project planning that have been achieved, albeit in the exact
same manor may vary greatly throughout the world due to parameters in standard
databases in different countries, such as activity costs, established workforce
performance and formation of the crews.
The task of this research is to develop an economical, cost and time planning for the
execution of construction for the residential estate, according to the fundamental
management tools based on the Russian and Spanish standard databases, in order to
examine the distinct differences between said databases
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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