Practical crash duration estimation for project schedule activities

Fachrurrazi, Fachrurrazi; Husin, Saiful

doi:10.1016/j.jksues.2019.09.005

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…The final decision to choose 60 days is the most appropriate if technical and external considerations aren't considered. The project acceleration for 60 days is highly recommended.According to prior research, the selection of acceleration time is based on optimizing the tradeoff of time and cost, and a proportional alternative from the cheapest cost with the fastest time is picked[34][35][36]. Consequently, to receive advantages equal to 60 days, the project must cover an additional IDR cost.…”

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confidence: 99%

RETRACTED: Construction Schedule Management for Densely Populated Areas Using CPM-Crashing

Amar,

Astuti,

Wulandari

2023

U Karst

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This article has been retracted: please see U Karst Policy on Article Withdrawal. (https://ojs.unik-kediri.ac.id/index.php/ukarst/article-retraction) This article has been retracted at the request of the Editor-in-Chief. This decision was taken because it was discovered that almost the same article had been published earlier on October 31, 2023, in the Jurnal Teknik Sipil: Rancang Bangun (https://ejournal.um-sorong.ac.id/index.php/rancangbangun/article/view/2632). The author was identified as having made multiple submissions, namely submitting a manuscript in the U Karst Journal on July 3, 2023, and also submitting almost the same manuscript in the Jurnal Teknik Sipil: Rancang Bangun on August 24, 2023. The Editors deplore the practice of simultaneous multiple submissions of papers to different journals. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter, and we apologize to the journal readers that this was not detected during the submission process.

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confidence: 99%

RETRACTED: Construction Schedule Management for Densely Populated Areas Using CPM-Crashing

Amar,

Astuti,

Wulandari

2023

U Karst

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“…Furthermore, the total acceleration time, the total acceleration cost, and the total acceleration cost per unit of time (cost slope) can be determined. Analysis using the Crashing method requires crash duration and crash cost to get the optimum value of construction execution (Fachrurrazi & Husin, 2021). The calculation formula of this method is as follows: Optimum crash activity is the activity that has the lowest cost slope value.…”

Section: Methodsmentioning

confidence: 99%

Optimization with crashing method and linear programming application on type 36 housing projects

et al. 2023

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The growth of housing in Indonesia has been very significant in recent years. The most found type of house is type 36. One of the areas with high purchasing power for housing is the Kendal Regency, which became the object of this study. Often housing projects experience delays caused by internal and external factors that can interfere with the duration of the initial planning. The effort that can be made to maintain the level of progress of the project is by acceleration. The optimal cost of the project due to the reduction in duration can be completed by acceleration techniques (Crashing) as linear programming models. In this study, Crashing and Linear Programming methods were chosen to optimize the value of adding costs to accelerate three samples of housing. Housing A, Housing B, and Housing C. The data collected is in the form of RAB, scheduling, and other supporting documents. Linear programming in this study using LINDO software. The plan to accelerate the construction of type 36 housing is carried out using alternative overtime working hours, adding 1, 2 and 4 working hours on critical activities of each project. The optimum time is selected based on the smallest cost slope value from the program crashing calculation. The result is shown that in housing A the most optimal addition was 2 hours of overtime with a total extra cost of Rp. 54,643,600 and a total acceleration of 15 days. In housing B, the optimum value of time and cost is by adding 4 hours of overtime with a total additional cost of Rp. 21,644,140 with a 27-day acceleration. In housing C, the development optimizes by adding 4 hours of overtime at an additional cost of Rp. 74,587,900 with a 29-day acceleration.

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“…The crash duration was the time required to shorten the duration of work activities to shorter than normal [22]. An alternative acceleration treatment in the work activities increased productivity, resulting in a shorter duration than normal time.…”

Section: Crash Durationmentioning

confidence: 99%

Repair Project Acceleration Strategy of Three Ship Units using Fuzzy Logic Analysis and Critical Path Method

Ubyani,

Tuswan,

Yudo

et al. 2023

Mekanika: Majalah Ilmiah Mekanika

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The project planning process, especially in ship repair projects, is essential to improving project completion. Ineffective planning of ship repair projects results in a lack of time and labour efficiency. Therefore, using project acceleration tools in scheduling ship repair activities is crucial to accelerate project completion and mitigate risk analysis of delays for each project activity. This research uses the critical path method (CPM) to analyze the main schedule of three combined ship repair projects. Then, shop-level planning is used to determine the productivity of each workshop so that each workshop knows the volume of work that needs to be completed daily. Furthermore, fuzzy logic is applied to analyze the risk of delays in repair project activities. The addition of working hours to critical work activities is accelerated from 30 days, the normal duration, to 23 days. Meanwhile, the addition of the workforce to critical work activities is accelerated from 30 days, the normal duration, to 22 days. The analysis of productivity values in each workshop results in the following productivity values: sandblasting and painting workshop 309.97 m2/person-days, piping workshop 4.12 units/person-days, fabrication workshop 407.16 kg/person-days, outfitting workshop 14.8 units/person-days, tank cleaning workshop 114.36 m3/person-days, and machining workshop 2.7 units/person-days. The fuzzy logic analysis results to determine the risk of delays in critical activities show that jobs with the codes SP1, SP2, SP3, SP4, M2, and SP5 have a high risk of delay. Additionally, the collaboration with other departments in the company, such as the marketing, finance, and human resources departments, is ongoing to complete assigned tasks.

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Practical crash duration estimation for project schedule activities

Cited by 8 publications

References 31 publications

RETRACTED: Construction Schedule Management for Densely Populated Areas Using CPM-Crashing

RETRACTED: Construction Schedule Management for Densely Populated Areas Using CPM-Crashing

Optimization with crashing method and linear programming application on type 36 housing projects

Repair Project Acceleration Strategy of Three Ship Units using Fuzzy Logic Analysis and Critical Path Method

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