OPTIMALISASI WAKTU PROYEK DENGANMENGGUNAKAN METODE CPM DAN PROBABILITAS WAKTU 3 DURASI (Studi Kasus Proyek Pembangunan Mall Laves Grand Sungkono Lagoon Surabaya)

2020 ◽  
Vol 8 (1) ◽  
pp. 22-25
Author(s):  
Muhammad Chilmi ◽  
Diah Ayu Restuti Wulandari
Keyword(s):  
Concrete Beam ◽  
Critical Line ◽  
Total Duration ◽  
Concrete Column ◽  
Project Schedule ◽  
Project Duration ◽  
Concrete Foundation ◽  
Scheduling Analysis ◽  
Total Settlement

There is many aspects of uncertainty on the project has led to accuracy in the preparation of the project schedule, Leading to the need scheduling analysis with probability 3 duration so that the different as a supporter who affect in duration total settlement in a project can be controlled and are not too late .An arrangement of scheduling existing on the project mall laves proven cause place aside of uncertainties aspects, so with using cpm method and probability of 3 duration to find the end of the project total duration of the most effective and efficient, the existing of project duration is 500 days the project start on 7 july 2018 and end on 1 december 2019 change into 694 days total duration and project start on the same existing duration project is on 6 july 2018 and end on 26 september 2020 with the deviation time of the day or about 194 days or around 6,5 month. The activities thats on the critical line is structure installment activities (like concrete foundation, concrete beam, concrete column, slab and concrete emergency ladder), ground activities (like cutting of the head of pile),elevator installment activities.

scholarly journals OPTIMIZATION OF PROJECT DURATION USING CPM METHOD AND MONTE CARLO CRYSTAL BALL SIMULATION

Neutron ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 17-25
Author(s):  
Muhammad Chilmi ◽  
Diah Ayu Restuti Wulandari
Keyword(s):  
Monte Carlo ◽  
Total Duration ◽  
Needs Analysis ◽  
Project Schedule ◽  
Crystal Ball ◽  
Work Activity ◽  
Project Duration ◽  
Entire Duration ◽  
Pile Cap

There are many aspects of uncertainty on the project that affect accuracy in the process of the making project schedule, so it needs analysis of the probability of the scheduling and sensitivity of work that affects to completion total duration of the project. The existing schedule of the project Laves Mall proved was late because ignored the uncertainty aspects, by using monte Carlo crystal ball simulation will help to find completion duration of the project with the most efficiency duration, Existing completion duration project is 500 days started on 6 July 2018 to 1 December 2019, after simulation change into 604 days and the project started same as existing duration which is on 6 July 2018 to 15 March 2020 by the deviation of the duration is 104 days or about 3 months. And the highest sensitivity work activity that affects the entire duration completion of projects is cutting off of head pile cap work with sensitivity percentage is 18,8%.

Analysis of the 3D State of Stress of a Concrete Beam

2014 ◽  
Vol 969 ◽  
pp. 45-50 ◽  
Author(s):  
Norbert Jendzelovsky
Keyword(s):  
Opposite Direction ◽  
Concrete Beam ◽  
Concrete Column ◽  
Fem Model ◽  
Tensile Stresses ◽  
State Of Stress

The concrete column with a longitudinal hole has been loaded by a system of forces. Within the beam around the hole, the values of the tensile stresses exceed the limit. Implementing the stress of the opposite direction, they could be eliminated. This stress is induced by four bars prestressed for 100 kN. A detailed FEM model is presented in the paper.

scholarly journals Assessing the Impact of the Lead/Lag Times on the Project Duration Estimates in Highway Construction

2021 ◽  
Vol 4 (3) ◽  
Author(s):  
Mohamed Abdel Raheem ◽  
Jennifer Reyes ◽  
Xiaohui Wang ◽  
Grecia Silva Sanchez ◽  
Alyssa Marie Garza
Keyword(s):  
Highway Construction ◽  
Total Duration ◽  
Lag Time ◽  
Soil Conditions ◽  
Sensitivity Index ◽  
Highway Projects ◽  
Project Duration ◽  
Time Sensitivity ◽  
Lag Times ◽  
The Impact

The literature mentions multiple factors that can affect the accuracy of estimating the project duration in highway construction, such as weather, location, and soil conditions. However, there are other factors that have not been explored, yet they can have significant impact on the accuracy of the project time estimate. Recently, TxDOT raised a concern regarding the importance of the proper estimating of the lead/lag times in project schedules. These lead/lag times are often determined based on the engineer’s experience. However, inaccurate estimates of the lead/lag time can result in unrealistic project durations. In order to investigate this claim, the study utilizes four time sensitivity measures (TSM), namely the Criticality Index (CI), Significance Index (SI), Cruciality Index (CRI), and the Schedule Sensitivity Index (SSI) to statistically analyze and draw conclusions regarding the impact of the lead/lag time estimates on the total duration in highway projects. An Excel-based scheduling software was developed with Monte Carlo simulation capabilities to calculate these TSM. The results from this paper show that the variability of some lead/lag times can significantly impact the accuracy of the estimated total project duration. It was concluded that the current practices used for estimating the lead/lag times are insufficient. As such, it is recommended to utilize more robust methods, such as the time sensitivity measures, to accurately estimate the lead/lad times in the projects scheduled.

Identifying Contractors’ Planned Quality Time in Egyptian Irrigation Projects

2022 ◽  
Vol 58 ◽  
pp. 155-170
Author(s):  
Mohamed Abdel-Hamid ◽  
Hanaa Mohamed
Keyword(s):  
Construction Sector ◽  
Project Schedule ◽  
Project Duration ◽  
Irrigation Projects ◽  
Clear Information

During an extremely competitive infrastructure sector such as irrigation projects, quality time (QT) must be determined to can recognize probable quality crisis parts and to direct mind on schedule enhancement chances. The consciousness of planners on the significance of QT could be reflected in their project schedule. This study appears a measurement of planned QT in five infrastructure irrigation projects performed by different five contractors in Egypt. The aim is to aid the contractors to develop their QT preparation and thus enhance their project time based on the results. QT is fundamental classified into two classes: conformance time (CT), and nonconformance time (NCT). Based on many studies, a register of quality proceedings that would be enclosed in every QT groups are then generated. The QT records for every group are recognized and gathered via questions and questionnaire designs. QT is calculated as a proportion of the project duration. It is uncovered that while enormous companies previously have clear information on QT in construction sector, these times are not scheduled in a defined method during a study of regular QT details. During time classification it is also appeared that greater conformance time (CT) lead to lesser nonconformance time (NCT). It is then ended that a lot of effort is still to be made by the contractors to establish a QT documenting procedure which be able to act as a base for their project enhancement planning.

scholarly journals Designing project schedule using crashing method to compress the fiber to the home project schedule

2021 ◽  
Vol 2 (1) ◽  
pp. 51
Author(s):  
Zha Sha Putri Anugerah ◽  
Devi Pratami ◽  
Mohammad Deni Akbar
Keyword(s):  
Total Duration ◽  
Project Work ◽  
Home Networks ◽  
Project Schedule ◽  
Project Cost ◽  
Total Cost ◽  
Overtime Work ◽  
Fiber To The Home ◽  
Total Project Cost ◽  
Total Project

ABC Company is an agent of network construction, operation, and maintenance. ABC Company is currently implementing the STTF (Shit to the Front) project, which is the project to add FTTH (Fiber to the Home) networks in areas that can have high customer demand. One of the STTF project construction sites is the Indra Prahasta II housing location. However, the project is currently experiencing work delays due to the Covid-19 disaster in Indonesia. Delays in project execution can result in potential prospects choosing another company that provides similar services. The project schedule can be accelerated using the crashing method and TCTO (Time Cost Trade-Off) analysis to solve this problem. This research's acceleration will be carried out with alternatives for adding 3 hours, 2 hours, 1 hour, and an alternative to increasing workers' number. This project has an average duration of 55 working days with a total cost of Rp 604,124,460. The results obtained from data processing, on the alternative of adding 1 hour of overtime work, the total duration becomes 54 working days with total project cost is Rp 605,734,138. In addition to 2 hours of overtime work, the project's total duration can be reduced to 54 days with a total project cost Rp 606,803,619. And for the addition of 3 hours overtime, the total duration can be shortened to 54 days with a total cost of Rp 606,803,619. As for increasing the number of workers, project work duration can be shortened to 54 working days with a total project cost Rp 604,556,748

Performance of Frame Structure Composed of Steel Reinforced Concrete Beam and Angle-Steel Concrete Column under Horizontal Loading

2012 ◽  
Vol 204-208 ◽  
pp. 1094-1101 ◽  
Author(s):  
Kun Wang ◽  
Hui Hui Luo ◽  
Wen Zhong Zheng
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Failure Modes ◽  
Reinforced Concrete Beam ◽  
Frame Structure ◽  
Concrete Column ◽  
Steel Reinforced Concrete ◽  
Composite Frame ◽  
Horizontal Loading ◽  
Angle Steel

This paper developed a finite element modelling (FEM) to simulate two frame specimens composed of steel reinforced concrete beam and angle-steel concrete column under horizontal loading. In the FEM, a series of simulation technologies such as defining material models, selecting element types, applying load, and parameters determination were described. Through the FEM, the skeleton curves, failure modes, and strain distribution are acquired, and the calculated results are basically agree well with the tests. Furthermore, the mechanism of the composite frame structure under horizontal loading is analyzed.

Easy Heuristic Way of Compromise Schedules Finding in Projects with Double-Constrained Resources

2015 ◽  
Vol 4 (4) ◽  
pp. 12-22
Author(s):  
Царьков ◽  
Igor Tsarkov
Keyword(s):  
Renewable Resources ◽  
Project Managers ◽  
Heuristic Methods ◽  
Project Schedule ◽  
Project Duration ◽  
Formation Problem ◽  
Optimum Solution ◽  
Manual Mode

Double-constrained resources are limited both on entire project, and for every period of its performance. Thus a project schedule formation problem represents a problem related to finding a tripartite compromise between project duration, and also renewable and non-renewable resources. It is one of the most difficult classes of tasks with determined parameters in which already at number of works in the project more than 20 it is possible to find the optimum solution only incidentally. Even heuristic methods are difficult and demand automation of calculations. In this work an algorithm and a set of recommendations will be presented which allow find problem solution’s optional versions practically in the manual mode even for the project with small number of works. The algorithm is adapted for such tasks Goyal method which is in turn based on the CPM-COST method, therefore this algorithm can be used for training of project managers and other experts, and it will promote better understanding of interrelations between the project’s key parameters.

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