New Time-Cost Trade-Off Model Considering the Sequence of Alternatives Between Activities

Kang, Namuk; Son, Jaeho; Lee, Seung–Hyun

doi:10.3130/jaabe.14.379

Cited by 4 publications

(2 citation statements)

References 15 publications

(20 reference statements)

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“…This due to the increasing cost slope is inconstant. Most studies show that the activity model can vary: discrete, linear and non-linear, as linear as in the study (Deckro and Hebert, 1990;Zeinalzadeh, 2011;Fachrurrazi et al, 2018b); the nonlinear is in (Deckro et al, 1995), (Siemens and Gooding, 1995); protect the discrete are in Kang et al (2015), and Son et al (2013). These models generated from several project data and respondents judgments can be applied as a standard model to similar activities of the different projects.…”

Section: Discussionmentioning

confidence: 99%

Sub-activity Time-Cost Trade-off Model of Building Structural Beam on the Projects in the North Aceh Region

Fachrurrazi

Abdullah

Away

et al. 2019

Aceh Int. J. Sci. Technol

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Problems for both delayed and accelerated activities in scheduling are common in most projects. This problem can implicate on the additional construction cost with different trends as a specific model. A model can provide valuable information to project acceleration judgement. This research aims to develop the TCTO sub-activity model of formwork, rebar work, and concrete work of the building structural beam on the projects in the North Aceh region. We have collected 33 data sourced from the project cost plan report and respondents judgment in the reviewed area. Descriptive statistics and the regression analysis are used to generate the TCTO model. The results show that the activity duration of the structural beam as broken down into sub-activities of formwork, rebar work and concrete work can be compressed until reaching 40%, 50%, and 40% of its normal duration, respectively. The additional cost of the compressed duration for each sub-activity shows the direct incremental cost per days of 3.67%, 3.63%, and 4.27% of its normal cost. Meanwhile, the possible crash cost of each the sub-activities are 122%, 118.15%, 125.61%, respectively.The models practically represent a linear model in the same daily pattern acceleration.

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Section: Discussionmentioning

confidence: 99%

Sub-activity Time-Cost Trade-off Model of Building Structural Beam on the Projects in the North Aceh Region

Fachrurrazi

Abdullah

Away

et al. 2019

Aceh Int. J. Sci. Technol

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show abstract

“…Ke et al (2009) and Ke (2014) solved the stochastic TCTP by creating a hybrid intelligent algorithm combining stochastic simulation and genetic algorithm. Kang et al (2015) formed a TCTP which considers FS, FF, SS and SF precedence relationships between activities. Bettemir and Bulak (2022) solved the TCTP by considering non-working days and the effect of climate.…”

Section: Introductionmentioning

confidence: 99%

Simplified Solution of Time-Cost Trade-off Problem for Building Constructions by Linear Scheduling

Bettemir¹

2023

JJCE

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Time-cost trade-off is an important optimization problem for contractors, because its optimum solution minimizes the total project cost. Formation of the time-cost trade-off problem causes an important workload, since the problem requires preparation of different construction cost and duration alternatives of the activities. Previous studies focused on the optimum solution of the problem and ignored the difficulties of the preparation of the different construction alternatives for the activities, which is a very difficult task for contractors. In this study, the creation of construction alternatives consisting of different time and cost values is automated. Quantity take-off of construction items is computed by user-defined dimensions of structural elements. Workmanship and material requirements are computed by pre-defined job descriptions and quantity take-off values. Different construction alternatives are formed by assigning different crew sizes and the corresponding construction durations are computed by estimating the job efficiency of the crew by regression models derived from the literature. Precedence relationships of the main construction items are pre-defined and the construction schedule is formed by a line of balance in terms of work days. The problem is optimized by a genetic algorithm the parameters of which are fine-tuned by experimental design. The developed approach is implemented on a spreadsheet application and the total optimization process including data entry is completed in one and a half hour on a desktop computer with i5 CPU. This study contributes to relevant literature by proposing a systematic approach for the formation of construction alternatives of the time-cost trade-off problem. The proposed approach can be beneficial for contractors and project managers to form and solve the time-cost trade-off problem with minimum endeavor and cost. KEYWORDS: Time-cost trade-off, Genetic algorithm, Line of balance, Optimization, Experimental design.

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Linearised CPM-COST model in the planning of construction projects

Radziszewska–Zielina

Sroka

2017

Procedia Engineering

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New Time-Cost Trade-Off Model Considering the Sequence of Alternatives Between Activities

Cited by 4 publications

References 15 publications

Sub-activity Time-Cost Trade-off Model of Building Structural Beam on the Projects in the North Aceh Region

Sub-activity Time-Cost Trade-off Model of Building Structural Beam on the Projects in the North Aceh Region

Simplified Solution of Time-Cost Trade-off Problem for Building Constructions by Linear Scheduling

Linearised CPM-COST model in the planning of construction projects

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