scholarly journals Effects of uncertainty on scheduling of highway construction projects

DYNA ◽  
2015 ◽  
Vol 82 (193) ◽  
pp. 155-164
Author(s):  
Hernán Darío Gómez ◽  
Armando Orobio
Keyword(s):  
Cost Estimation ◽  
Construction Projects ◽  
Highway Construction ◽  
Analysis Data ◽  
Process Data ◽  
Construction Time ◽  
Cost Overruns ◽  
Construction Scheduling ◽  
Granular Base ◽  
Construction Documents

Time and cost overruns in highway construction are usual in Colombia. Contractors regularly fail in cost estimation and construction scheduling. An analysis of important factors on time and cost overruns in highway construction in southwest Colombia is presented in this paper. Forty highway construction projects were reviewed. Data from construction documents were collected to prepare a data base for probabilistic analysis. Data collected include scheduled construction time and cost, actual construction time and cost, and unexpected events which could have affected the construction process. Data were used in a probabilistic cost and schedule risk analysis to identify critical factors in construction time and cost overruns in the region. It was found that the activities that most affect the time and cost overruns are the construction of the granular base and the asphalt layer. The most common causes of construction overruns were found to be poor cost and duration estimates, rain, and materials supply problems.

scholarly journals Building Information Modelling Technology in Mitigating Cost Overruns and change orders in Construction Projects

2021 ◽  
Vol 4 (1) ◽  
pp. 50-64
Author(s):  
Ja’far A. Aldiabat Al-Btoosh
Keyword(s):  
Construction Industry ◽  
Cost Estimation ◽  
Construction Projects ◽  
Information Modeling ◽  
Cost Overruns ◽  
Change Orders ◽  
Significant Difference ◽  
Project Costs ◽  
Building Information ◽  
And Control

Variation order (VO) is one of the main issues faced by the construction industry in Jordan. Many researchers had investigated on the causes of VO and proposed procedures to minimize and control this issue; however, the VO is affecting the construction industry badly even at moment. Building Information Modeling (BIM) is a powerful management system that can make a significant difference in the project costs. However, BIM has not been examined as a tool to minimize the VO in Jordan. The main target of this study is to utilize BIM applications in reducing the effect of VO on the governmental projects in Jordan. In order to achieve this target, the researcher has designed a questionnaire to gather data related to VO causes and the BIM capability to solve this problem. The data collected from the questionnaires were analyzed statistically. The result from the analysis found that the consultant initiated the highest VO of 50% followed by the clients and the contractors of 20% and 10% unforeseen variation respectively. Moreover, it is found that BIM Design Applications, Facility Operations Simulation, Exploration Design Scenarios, BIM Design Detection and BIM Quantity Take-off and Cost Estimation were significantly capable of minimizing VO. The results show positive relationship with the application of BIM in minimizing VO in the construction industry in Jordan. © 2018. JASET, International Scholars and Researchers Association

A BIM-integrated graph database for the construction execution phase

2021 ◽  
Author(s):  
Sebastian Seiß ◽  
Hans-Joachim Bargstädt
Keyword(s):  
Cost Estimation ◽  
Data Model ◽  
Construction Projects ◽  
Visual Navigation ◽  
Digital Data ◽  
Graph Database ◽  
Process Data ◽  
User Friendliness ◽  
Construction Companies ◽  
Execution Phase

<p>The execution of construction has to deal with a huge amount of operational data. By now, construction companies, as well as the other stakeholders, have no digital solution available, to deal with this data. The paper will demonstrate a building information Model (BIM)-based data model for the execution phase of construction projects. This data model is implemented into a graph database, which stores the process data and links it to the BIM. The graph database makes it possible to visualize relations between the process data and the BIM. Instead of spreadsheets an easier visual navigation and flexible customization can be reached.</p><p>The aim of this paper is to evaluate the feasibility of the developed graph database to describe the interdependencies between processes and information management. For the evaluation, an infrastructure project as case study is chosen. This kind of project covers a huge scope of different building construction technics, which makes it suitable for evaluation. Furthermore, the design, cost estimation and scheduling of the project are done by BIM-based software. This provides a digital data basis, which will be visualized in a graph and used to add process data. The exploration focussed on user-friendliness by visualization, querying and the possibility of flexible data organisation.</p>

scholarly journals Applying Interpretive Structural Modeling to Cost Overruns in Construction Projects in the Sultanate of Oman

2015 ◽  
Vol 12 (1) ◽  
pp. 53 ◽  
Author(s):  
K. Alzebdeh ◽  
H.A. Bashir ◽  
S.K. Al Siyabi
Keyword(s):  
Cost Estimation ◽  
Construction Projects ◽  
Project Managers ◽  
Decision Makers ◽  
Sultanate Of Oman ◽  
Interpretive Structural Modeling ◽  
Cost Overruns ◽  
Complex Interactions ◽  
Project Costs ◽  
The Us

Cost overruns in construction projects are a problem faced by project managers, engineers, and clients throughout the Middle East.  Globally, several studies in the literature have focused on identifying the causes of these overruns and used statistical methods to rank them according to their impacts. None of these studies have considered the interactions among these factors. This paper examines interpretive structural modelling (ISM) as a viable technique for modelling complex interactions among factors responsible for cost overruns in construction projects in the Sultanate of Oman. In particular, thirteen interrelated factors associated with cost overruns were identified, along with their contextual interrelationships. Application of ISM leads to organizing these factors in a hierarchical structure which effectively demonstrates their interactions in a simple way. Four factors were found to be at the root of cost overruns: instability of the US dollar, changes in governmental regulations, faulty cost estimation, and poor coordination among projects’ parties. Taking appropriate actions to minimize the influence of these factors can ultimately lead to better control of future project costs. Thisstudy is of value to managers and decision makers because it provides a powerful yet very easy to apply approach for investigating the problem of cost overruns and other similar issues.  

scholarly journals Assessment of the Cost and Time Impact of Variation Orders on Construction Projects in Sulaimani Governorate

2021 ◽  
Vol 27 (2) ◽  
pp. 106-125
Author(s):  
Karukh Hassan Mohammad ◽  
Noori Sadiq Ali ◽  
Basira Majeed Najm
Keyword(s):  
Construction Projects ◽  
Descriptive Statistics ◽  
Construction Time ◽  
Project Cost ◽  
Cost Overruns ◽  
Project Costs ◽  
Type Size ◽  
The Cost ◽  
The Impact ◽  
One Way Anova

Variation orders are an on-going phenomenon in construction and industry projects worldwide, particularly in the province of Sulaimani, where the project's damage from cost and schedule overrun because of variation orders. However, the effect on project costs and time overrun of variation order has yet to be identified. This study evaluates the impact of variation orders on the cost and time off in the Sulaimani governorate. Two hundred twenty-eight projects from various construction sectors built between 2007-2012 were adopted to calculate the contract cost and schedule overruns due to variation orders. Data analysis was applied in the study were descriptive statistics. One-way ANOVA was also applied to determine whether the overrun of project cost and schedule significantly varied depending on project type, size, duration, location, and awarded years. The findings indicated that cost overruns are very common due to variation orders. 95.6% of the projects were studied being impacted, and overrun in project cost are also huge, with 16%. Time also overruns more common than cost overruns due to the variation orders. 98.7% of the projects were studied in Sulaimani were affected by time overrun with an average of 46.3% of initial duration observed. Findings also indicated that two out of five parameters measured in the analysis had a significant correlation with project cost overruns. Three out of five considered variables correlated with construction time overruns. 

Major causes of construction time and cost overruns

2017 ◽  
Vol 15 (2) ◽  
pp. 181-198 ◽  
Author(s):  
Samuel Famiyeh ◽  
Charles Teye Amoatey ◽  
Ebenezer Adaku ◽  
Collins Sena Agbenohevi
Keyword(s):  
Interest Rates ◽  
Financial Management ◽  
Construction Projects ◽  
Cost Overrun ◽  
Construction Sector ◽  
Construction Time ◽  
Government School ◽  
Cost Overruns ◽  
Content Type ◽  
Factors Affecting

Purpose In Ghana, the duration of construction projects from inception to completion is becoming a great concern, recently, especially among clients and beneficiaries, because of the rising interest rates, inflation, development plan targets, among other factors. Hence the need to understand the causes of delays and cost overrun in the construction sector has become more important than ever. This study therefore aims to identify the major factors underlying time and cost overruns in projects related to the education sector in Ghana to proffer practical solutions in addressing them. Design/methodology/approach The study conducted a survey among clients’ consultants and representatives of the contractors working on about 60 government school projects. A relative importance index was used to determine the relative effects of the factors causing construction time and cost overruns. Findings The key factors causing construction time overrun were: financial problems, unrealistic contract durations imposed by clients, poorly defined project scope, client-initiated variations, under-estimation of project cost by consultants, poor inspection/supervision of projects by consultants. Other factors were underestimation of project complexity by contractors, poor site management, inappropriate construction methods used by contractors and delays in the issuance of permits by government agencies. Factors affecting cost overruns were financial difficulty by client, delays in payments of completed works, variations in designs, lack of communications plans, poor feasibility and project analysis, poor financial management on site and material price fluctuations. Research limitations/implications The research was limited to only the educational sector projects. Practical implications Practically, this study highlights for the construction sector the critical factors causing project time and cost overruns in Ghana. Identification of these factors provides the basis for pragmatic solutions to enhance the chances of project success. Social implications The identification and solutions to project time and cost overruns, especially for educational sector projects, contribute toward making public goods more affordable and accessible to most citizens, particularly in developing countries. Originality/value This study contributes to the debate on factors causing project time and cost overruns in the construction sector especially from a developing country’s perspective.

scholarly journals Time and Resource Management of Residential Apartment Construction using Building Information Modeling

2019 ◽  
Vol 8 (10) ◽  
pp. 4238-4246
Keyword(s):  
Resource Management ◽  
Cost Estimation ◽  
Construction Projects ◽  
Building Information Modeling ◽  
Early Stage ◽  
Building Design ◽  
Information Modeling ◽  
Cost Overruns ◽  
Building Information

To complete a project under the complicated situations, it is important to follow effective ways to use available tools and methods, taking into account present technology and management. Also, it is challenging to prepare accurate and achievable plans in large construction projects. Visualizing forms at an early stage in building design improves the ability of designers to deliver ideas and the capability to inspect and assess the methods helps to predict and optimize the actual presentation of the construction project. These different features form the basis for Building Information Modeling (BIM). The archetypal problems like budget overflow, lack of communication, cost overruns, overtime delays, rework can be minimized with the use of Building Information Modeling (BIM) tools for building design & resource management. In this paper, the concept of Building Information Modelling (BIM) is used for 3D modeling, which involves 4th dimension as Time (4D), 5th dimension of Cost (5D) of the project. A case study of G+5 residential apartment is presented for 3D BIM modeling and quantity take-off with the commercial software Autodesk Revit 2019. The 4D BIM carried out using Primavera P6 is explained with methodology for a case study. Further, Autodesk Navisworks Manage 2019 is used for 5D BIM, which includes a graphical presentation of the construction schedule and cost estimation of the case study.

scholarly journals An Integrated Decision Support Model Based on BWM and Fuzzy-VIKOR Techniques for Contractor Selection in Construction Projects

2021 ◽  
Vol 13 (12) ◽  
pp. 6933
Author(s):  
Aziz Naghizadeh Vardin ◽  
Ramin Ansari ◽  
Mohammad Khalilzadeh ◽  
Jurgita Antucheviciene ◽  
Romualdas Bausys
Keyword(s):  
Construction Projects ◽  
Construction Project ◽  
Water Channel ◽  
Multicriteria Decision Making ◽  
Decision Support Model ◽  
Cost Overruns ◽  
Contractor Selection ◽  
Model Based ◽  
Fuzzy Vikor ◽  
Bid Price

Sustainable development of any country to some extent depends on successful accomplishment of construction projects, particularly infrastructures. Contractors have a key role in the success of these projects. Hence, the selection of a competent contractor as a complicated and hard decision process has a vital importance in the destiny of any construction project. Contractor selection is in essence a multicriteria decision-making that ought to encompass so many aspects of the project and the client’s requirements on one hand and the capabilities and past records of the contractors on the other hand. Failure in selecting a competent contractor may cause time and cost overruns; quality shortcomings; increasing in claims, disputes and change orders; and even failure of the project. In spite of deficiencies of selecting a contractor by the rule of “the lowest bid price”, it still prevails in many countries including Iran. In this paper, a new contractor selection model based on the best-worst method (BWM) and well-known Fuzzy-VIKOR techniques is proposed as a solution to overcome the deficiencies of the traditional “lowest bid price” rule. An illustrative example of a water channel construction project verified the applicability of the proposed model in practice.

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