Impact of Design Cost on Project Performance of Design-Bid-Build Road Projects

2014 ◽  
Vol 30 (3) ◽  
pp. 04014007 ◽  
Author(s):  
Pramen P. Shrestha ◽  
Nirajan Mani
2020 ◽  
Vol 12 (16) ◽  
pp. 6340 ◽  
Author(s):  
David Leicht ◽  
Daniel Castro-Fresno ◽  
Joaquìn Dìaz ◽  
Christian Baier

Although tremendous technological and strategic advances have been developed and implemented in the construction sector in recent years, there is substantial room for improvement in the areas of productivity growth, project performance, and schedule reliability. Thus, the present paper seeks to discover why the currently applied scheduling tools and the latest agile-based project organization approaches have not yet achieved their full potential. A missing interlinkage between the project’s design, cost, and time aspects within the project design phase and its sparse utilization throughout project execution were indicated as the driving contributors responsible for the slow progress in development. To fundamentally change this situation, an extensive and coherent project organization solution is proposed. The key process of this solution utilizes a 5D Building Information Model comprising tight concatenations between the individual model objects and the corresponding construction cost and time effort values. The key dates of a waterfall-based construction process simulation, set during the project planning phase, provide particular information to create a structure for agile organized project execution. The implementation of information feedback loops allows target/actual comparisons and contributes to continual improvements in future planning. A comparative case study was conducted with auspicious results on improvements in the overall project performance, and schedule and cost reliability.


2020 ◽  
Vol 27 (1) ◽  
pp. 6-11
Author(s):  
Salar Ahmed ◽  
Noori Ali

The conceptual cost estimation is a critical indicator of the future of the project\\\’s success at the initial process before submitting the project design. Pre-Design cost measuring is recognized as the very important procedure which affects the future of constructing proposed projects of roads. Pre-design cost is a preliminary cost measuring and is considered the prediction of the cost of a project during the planning and design phase. This evaluating and measure provides a great foundation for the process of financial support decisions and cost control. The aim of this study is to create pre-design cost measuring model for constructing road projects by utilizing linear regression technique. The research methodology consists of the data collected from public sectors which are the actual cost of the constructed road projects in Erbil governorate, then models have been developed by applying SPSS software, then the models summarized and selected. The mean absolute percentage error (MAPE) has been calculated using Excel program to calculate degree of the accuracy for the produced models. The accuracy was between -29% and +51%. As a result of the study regression models are useful and has a big advantage in predicting project cost in pre-design process and the planning stage of the project, by using either simplex computer scheme or any measuring tools


2020 ◽  
Vol 19 (2) ◽  
pp. 334-345
Author(s):  
Maria Calahorra-Jimenez ◽  
Luis Fernando Alarcon ◽  
Cristina Torres-Machi ◽  
Alondra Chamorro ◽  
Keith Molenaar

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