scholarly journals COST RISK’S RELIABILITY AND VALIDITY OF RESIDENTIAL BUILDING PROJECT’S WHOLE LIFE CYCLE IN THE UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 90-114
Author(s):  
Ahmed Sadek
Keyword(s):  
Life Cycle ◽  
Project Management ◽  
United Arab Emirates ◽  
Life Cycle Cost ◽  
Reliability And Validity ◽  
Residential Building ◽  
Future Research ◽  
Unique Contribution ◽  
Risk Modelling ◽  
Whole Life Cycle

Purpose – Project management cost and risk modelling is experiencing the challenge of identifying cost risks values to maintain accurate modelling, estimating, and assessment. Latest research focused on cost and risk modelling and estimation. The significance of cost risks numerical values come from its ability to be used in many different analysis and approaches. This article aims to identify residential building projects’ whole life cycle cost risks numerical values in UAE at the preconstruction stage and ensure its reliability and validity. Methodology – The approach of this research is pure quantitative. The methodology of this research is to collect data though conducting face-to-face interviews quantitatively (i.e., cost risks values). The survey is using PMBOK risk matrix (i.e., probability vs. impact). Finally, data correlation and regression modelling ware done to ensure the reliability and validity of each cost risk value. Findings – This paper was able to deliver reliable and valid residential project’s whole life cycle cost risks values (i.e., 117 cost risks) for direct use in future research or practical professional cost analysis. Unique contribution to theory, practice and policy – This article contribution to the project management body of knowledge is to collect all relevant cost risks (i.e., 117 cost risks) and obtain their values from UAE field experts for the first time. The provided values are for residential project in UAE only. The perspective of how to look to cost risks values in this article (i.e., contractors’ and clients’ views) should be considered at the time of using the data. The consultancy services organizations will have different cost risks because they do not deal with delivering the final product, but they provide supporting services (i.e., design and supervision) to facilitate delivering the project.

scholarly journals SYSTEM DYNAMICS APPROACH FOR WHOLE LIFE CYCLE COST MODELLING OF RESIDENTIAL BUILDING PROJECTS IN UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 49-71
Author(s):  
Ahmed Sadek
Keyword(s):  
Life Cycle ◽  
System Dynamics ◽  
United Arab Emirates ◽  
Residential Buildings ◽  
Residential Building ◽  
Information Value ◽  
Estimation Accuracy ◽  
Unique Contribution ◽  
Cost Modelling ◽  
Whole Life Cycle

Purpose – Project management field is experiencing many challenges to maintain its performance within planned budget. Latest research focused on cost modelling and estimation. The significance of cost modelling comes from the forecasted information value. It is needed in the United Arab Emirates to satisfy the future vision and strategies. Methodology – This article aims to model project's whole life cycle costs of residential buildings in UAE at the preconstruction stage, choosing VENSIM system dynamics approach. The objective is to simulate dynamically cost over time for all outputs. The approach of this research is pure quantitative. It requires mapping diagrams and mathematical computation systems. DEMO simulation and real data verification modelling are used to ensure the outputs’ validity. The mean absolute deviation and mean square error are used for measuring the estimation accuracy. Findings – This research proved that VENSIM system dynamics approach can model and estimate residential building project’s cost and cash flow dynamically through time, with high accuracy, in the United Arab Emirates. Unique contribution to theory, practice and policy – This research provides the first cost estimation modelling for residential projects’ whole life cycle using VENSIM system dynamics approach. It is opening new research opportunities in cost modelling and estimating fields. The theoretical-implications, practical-implications, and limitations are presented in the conclusion for future research. 

scholarly journals MONTE-CARLO APPROACH FOR MEASURING ADJUSTING COST RISKS VALUES OF RESIDENTIAL BUILDING PROJECT’S WHOLE LIFE CYCLE FROM CLIENTS’ PERSPECTIVE IN THE UNITED ARAB EMIRATES

2021 ◽  
Vol 6 (1) ◽  
pp. 72-89
Author(s):  
Ahmed Sadek
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
United Arab Emirates ◽  
Monte Carlo Model ◽  
Residential Building ◽  
Statistical Modelling ◽  
Future Research ◽  
Unique Contribution ◽  
Monte Carlo Approach ◽  
Whole Life Cycle

Purpose – Although projects’ experts always take into consideration the related cost-risks. They are experiencing the challenge of not being able to finish the project within the estimated budget. Latest cost-risks studies concentrated on modelling and estimating risks at the preconstruction stage. This article aims to approach Monte-Carlo simulation using stochastic mathematical modelling to measure cost-risks error (i.e., adjusting cost-risks). Methodology – The approach of this research is solely quantitative. It is using statistical modelling and simulations to ensure the accuracy and precision of the developed Monte-Carlo model. However, this study is utilizing Microsoft Office Excel Software Mersenne twister algorithm to generate random numbers to ensure most accurate Monte-Carlo approach. The mathematical equations system is built into Excel. Findings – The research outputs are considered significant in project management body of knowledge. This is because of the resulted evidence that is proving the applicability to measure cost risks error using Monte-Carlo simulation. This study presented cost risks and differentiated between contractors’ and clients’ views.    Unique contribution to theory, practice and policy – The originality of this article comes from providing the first Monte-Carlo approach for measuring projects’ cost-risks error from client’s perspective. The theoretical-implications, practical-implications, and limitations are presented in the conclusion for future research.

scholarly journals The Analysis of Variants of Water Supply Systems in Multi-Family Residential Building

2015 ◽  
Vol 21 (4) ◽  
pp. 623-635 ◽  
Author(s):  
Daniel Słyś ◽  
Agnieszka Stec
Keyword(s):  
Life Cycle ◽  
Water Supply ◽  
Life Cycle Cost ◽  
Rainwater Harvesting ◽  
Residential Building ◽  
Water Supply Systems ◽  
Municipal Water ◽  
The World ◽  
Whole Life Cycle ◽  
Supply Systems

Abstract Climate change, improper use of water resources, surface waters pollution as well as increase of water requirements are the results of growing population of people in the world. It causes water deficiency in majority of countries in the world, including Poland. Due to the water pollution advanced technologies for its treatment are in demand, what leads to increase of water price. In this connection, there are more often taken actions to reduce water consumption by using rainwater to flush toilets, wash cars, do laundry or water green areas. This publication presents results of Life Cycle Cost analysis of two variants of water supply systems designed for multi-family residential building situated in Rzeszow. In line with LCC methodology the calculations were made throughout the whole life-cycle of the building considering initial investment outlays intended for construction of water supply system as well as operation and maintenance costs. In the first of analyzed variants it was assumed that the system would be fed by municipal water supply network. In the second variant rainwater harvesting system for domestic use was additionally applied. Rainwater stored in the tank would be used in sanitary installation to flush toilets, what leads to lowering the costs of municipal water purchase, reducing fees for rainwater discharge to sewage system and consequently is beneficial for financial standing of the examined building.

scholarly journals BIM-Based Tools for Managing Construction and Demolition Waste (CDW): A Scoping Review

2021 ◽  
Vol 13 (15) ◽  
pp. 8427
Author(s):  
Bahareh Nikmehr ◽  
M. Reza Hosseini ◽  
Jun Wang ◽  
Nicholas Chileshe ◽  
Raufdeen Rameezdeen
Keyword(s):  
Life Cycle ◽  
Scoping Review ◽  
Construction And Demolition Waste ◽  
Future Research ◽  
Demolition Waste ◽  
Scant Attention ◽  
Intellectual Deficiencies ◽  
Whole Life Cycle ◽  
Point Of Reference ◽  
Design And Construction

This article provides a picture of the latest developments in providing BIM-based tools for construction and demolition waste (CDW) management. The coverage and breadth of the literature on offering BIM-based tools and technologies for dealing with CDW throughout the whole life cycle of construction are investigated, and gaps are identified. Findings reveal that, although various BIM-based technologies are closely associated with CDW, much of the existing research on this area has focused on the design and construction phase; indeed, the problem of CDW in post-construction stages has received scant attention. Besides, the now available tools and technologies are lacking in cross-phase insights into project waste aspects and are weak in theoretical rigor. This article contributes to the field by identifying the intellectual deficiencies in offering BIM-based tools and technologies when dealing with CDW. So, too, it points to major priorities for future research on the topic. For practitioners, the study provides a point of reference and raises awareness in the field about the most advanced available BIM-based technologies for dealing with CDW problems.

scholarly journals Predication of life cycle cost of equipment base on unbiased grey Markov models

2020 ◽  
Vol 309 ◽  
pp. 05005
Author(s):  
Yonghong Chen ◽  
Ping Hu ◽  
Dong Zhang
Keyword(s):  
Life Cycle ◽  
Markov Model ◽  
Life Cycle Cost ◽  
Prediction Accuracy ◽  
Markov Models ◽  
Grey Model ◽  
Model Accuracy ◽  
Integrated Logistics ◽  
And Control ◽  
Whole Life Cycle

Life cycle cost(LCC) is an important content of equipment integrated logistics support. While the LCC includes the whole life cycle of equipment from development, production, service and maintenance to retirement, in order to effectively manage and control the LCC and better develop integrated logistics support, it is necessary to analyze and predict it. The unbiased grey markov model(UGMM) was introduced into the LCC prediction in the paper, in order to check model accuracy, the posterior difference method(PDM) was used, also the influence by the number of state intervals in UGMM on the prediction accuracy is analyzed and studied. The result indicate that UGMM can be used to predict the LCC, also have the highest prediction accuracy comparing with unbiased grey model and grey separating model, and in order to ensure the prediction accuracy, the state interval should be divided according to the number of sequence.

scholarly journals General Concerns Life-Cycle Design of Economical Ice-Resistant Structures in the Bohai Sea

2017 ◽  
Vol 24 (s2) ◽  
pp. 164-171
Author(s):  
Da-yong Zhang ◽  
Song-song Yu ◽  
Qian-jin Yue
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Design Theory ◽  
Bohai Sea ◽  
Cost Effective ◽  
Bohai Bay ◽  
Offshore Platforms ◽  
The Bohai Sea ◽  
Life Cycle Design ◽  
Whole Life Cycle

Abstract In China, the oil and natural gas resources of Bohai Bay are mainly marginal oil fields. It is necessary to build both iceresistant and economical offshore platforms. However, there are many risks during the life cycle of offshore platforms due to the imperfect preliminary design for the Bohai Sea economical ice-resistant structures. As a result, the whole life-cycle design should be considered, including plan, design, construction, management and maintenance design. Based on the demand of existing codes and research of the basic design, structural ice-resistant performance and the reasonable management and maintenance, the life-cycle design theory is discussed. It was concluded that the life-cycle cost-effective optimum design proposed will lead to a minimum risk.

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