Th e lack of accomplishment of the main management functions in construction projects had been re... more Th e lack of accomplishment of the main management functions in construction projects had been reported worlwide. The symptoms are well recognized, like cost and time overruns, deficient quality and lack of safety. To help clarifying the reasons for this evidence, a survey was carried to Portuguese construction stakeholders, based on an Internet inquiry, aimed to characterize past projects. While time for the answers is still running, the main important conclusion retrieved from the survey is that industry practicioners do not have, or do not want to provide, quantitative information about past projects. This, in fact, may be signalled as the first reason for the lack of competitiveness of the construction industry in Portugal.
Most construction projects in Portugal do not fully achieve the main management functions, namely... more Most construction projects in Portugal do not fully achieve the main management functions, namely cost and time. Accordingly, the competitiveness of the Portuguese construction industry has been ranked fairly low. A survey was conducted among the main construction stakeholders to help clarify the reasons for this problem. The inquiry used for the survey focused on the characteristics of major projects concluded in the last years and on specific data on the attainment of cost and schedule objectives. Research revealed that clients and contractors agree that major causes for cost overruns were due to design errors, direct changes ordered by the client and different site conditions due to geological and geotechnical obstacles. Client liability, design problems and the project specifics were the main causes indicated by clients and contractors for project delays. However, clients also specified main responsibilities for project delays to inadequate construction management.
A evolução científica, impulsionada pelo desenvolvimento de técnicas de solução computacional de ... more A evolução científica, impulsionada pelo desenvolvimento de técnicas de solução computacional de modelos matemáticos complexos, promoveu a implementação de novas ferramentas teóricas para a caracterização de regimes fluidodinâmicos em sistemas particulados. Tendo em vista, por exemplo, a não linearidade de sistemas fluidizados, ocasionada pela complexidade da interação entre as fases envolvidas, a análise de caos determinístico emerge como um poderoso instrumento na investigação destes fenômenos. Este trabalho utiliza a análise não linear de séries temporais aplicada a informações teóricas advindas da equação de Ergun na descrição da fluidização homogênea, e da equação de Ergun modificada, para fluidização heterogênea. O objetivo central do trabalho é o de relacionar os parâmetros determinísticos entropia de Kolmogorov e a dimensão de correlação com distintos regimes de fluidização. Os resultados teóricos demonstram que tanto a entropia de Kolmogorov como a dimensão de correlação ap...
The importance of claims and disputes in Portuguese public contracting is so large nowadays that ... more The importance of claims and disputes in Portuguese public contracting is so large nowadays that most construction managers tend to consider a specific final stage of the project life cycle for dealing with them. The aim of this paper is to characterise claims in railway projects conducted in the last few years in Portugal. A survey was made to project
Page 1. 286 17.1 Conflicts: a behavioural process It is not unusual that a chapter on conflict ma... more Page 1. 286 17.1 Conflicts: a behavioural process It is not unusual that a chapter on conflict management, which is about, generally speaking, helping people or organizations that are in conflict with each other to deal with their ...
Th e lack of accomplishment of the main management functions in construction projects had been re... more Th e lack of accomplishment of the main management functions in construction projects had been reported worlwide. The symptoms are well recognized, like cost and time overruns, deficient quality and lack of safety. To help clarifying the reasons for this evidence, a survey was carried to Portuguese construction stakeholders, based on an Internet inquiry, aimed to characterize past projects. While time for the answers is still running, the main important conclusion retrieved from the survey is that industry practicioners do not have, or do not want to provide, quantitative information about past projects. This, in fact, may be signalled as the first reason for the lack of competitiveness of the construction industry in Portugal.
Most construction projects in Portugal do not fully achieve the main management functions, namely... more Most construction projects in Portugal do not fully achieve the main management functions, namely cost and time. Accordingly, the competitiveness of the Portuguese construction industry has been ranked fairly low. A survey was conducted among the main construction stakeholders to help clarify the reasons for this problem. The inquiry used for the survey focused on the characteristics of major projects concluded in the last years and on specific data on the attainment of cost and schedule objectives. Research revealed that clients and contractors agree that major causes for cost overruns were due to design errors, direct changes ordered by the client and different site conditions due to geological and geotechnical obstacles. Client liability, design problems and the project specifics were the main causes indicated by clients and contractors for project delays. However, clients also specified main responsibilities for project delays to inadequate construction management.
A evolução científica, impulsionada pelo desenvolvimento de técnicas de solução computacional de ... more A evolução científica, impulsionada pelo desenvolvimento de técnicas de solução computacional de modelos matemáticos complexos, promoveu a implementação de novas ferramentas teóricas para a caracterização de regimes fluidodinâmicos em sistemas particulados. Tendo em vista, por exemplo, a não linearidade de sistemas fluidizados, ocasionada pela complexidade da interação entre as fases envolvidas, a análise de caos determinístico emerge como um poderoso instrumento na investigação destes fenômenos. Este trabalho utiliza a análise não linear de séries temporais aplicada a informações teóricas advindas da equação de Ergun na descrição da fluidização homogênea, e da equação de Ergun modificada, para fluidização heterogênea. O objetivo central do trabalho é o de relacionar os parâmetros determinísticos entropia de Kolmogorov e a dimensão de correlação com distintos regimes de fluidização. Os resultados teóricos demonstram que tanto a entropia de Kolmogorov como a dimensão de correlação ap...
The importance of claims and disputes in Portuguese public contracting is so large nowadays that ... more The importance of claims and disputes in Portuguese public contracting is so large nowadays that most construction managers tend to consider a specific final stage of the project life cycle for dealing with them. The aim of this paper is to characterise claims in railway projects conducted in the last few years in Portugal. A survey was made to project
Page 1. 286 17.1 Conflicts: a behavioural process It is not unusual that a chapter on conflict ma... more Page 1. 286 17.1 Conflicts: a behavioural process It is not unusual that a chapter on conflict management, which is about, generally speaking, helping people or organizations that are in conflict with each other to deal with their ...
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