Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil

Competency Evolution: A Framework for Construction Project Managers

Susy F. Rostiyanti, Seng Hansen, Riri Vermatasari — Tue, 12 Nov 2024 00:00:00 +0700

The effective execution of a construction project heavily relies on a diverse set of human resources possessing various competencies. Competency is a multifaceted concept with varied interpretations depending on its application and development. In this diverse landscape, competencies are commonly understood to encompass attributes such as knowledge, skills, and abilities. These competencies also feature distinct transferable qualities within intrapersonal and interpersonal competencies. This study delves into the crucial role of competencies in managing construction projects efficiently, emphasizing the three primary components. Employing a Systematic Literature Review, the study aims to uncover the nuanced aspects influencing project manager competencies. The primary objective is to unravel the competencies empowering project managers to successfully navigate construction projects. The findings highlight leadership as the paramount skill competency and underscore the importance of responsibility as a key attitude competency. Additionally, the study introduces a framework delineating the evolutionary progression of project manager competencies from intrapersonal to interpersonal over time. This framework serves as a valuable resource for project management professionals seeking to enhance their competencies and effectively address the dynamic challenges inherent in construction projects.

Kinerja Struktur Perkerasan Aspal Porus Modifikasi dengan Pemodelan Program KENPAVE

Arief Aszharri, Dimas Ariezky Susetyo, Suherman Sulaiman — Mon, 25 Nov 2024 00:00:00 +0700

Flexible pavement planning methods can be classified into five categories, namely empirical methods, methods for limiting shear failure, methods for limiting deflection, regression methods based on pavement performance or road tests and empirical mechanistic methods. Pavement design procedures can be modeled as several layers or viscoelastic structures in an elastic band. By estimating that the pavement structure is like this, it is possible to calculate the stresses, strains, or deflections caused by traffic loads and environmental factors. This research will evaluate the construction structure of a porous asphalt mixture using cariphalte modified asphalt and the addition of gilsonite on a road section with a high traffic volume with an LHR above 50,000 pavement vehicles so that the thickness of the pavement structure layer will be obtained and then evaluated using the KENPAVE program. The results of this study show that the structural performance of porous asphalt mixtures with the addition of gilsonite in the pavement structure increases not significantly with increasing permit repetition loads at fatigue crack damage criteria of 0.5% and 0.45% for segment 4 and segment 5 respectively. Segment 3 showed a significant increase in the permit repetition load of 26.3% compared to the normal mixture. The structural performance of porous asphalt mixtures with the addition of gilsonite in the pavement structure increases insignificantly with the increase in the repetition permit load on the criteria for used grooves from vehicle wheels by 0.42% and 0.74% respectively for segment 4 and segment 5. However, in segment 3, there was a significant increase in the permit repetition load of 30.5% compared to the normal mixture.

Estimasi Quantity Take Off dan Simulasi Progress Pekerjaan Struktur dengan Pendekatan Building Information Modeling

Sapitri, Rusli Subagja, Bismi Annisa — Fri, 15 Nov 2024 00:00:00 +0700

Estimating the quantity of take-off and scheduling is crucial in a project life cycle. Errors in the calculation of quantity take-off and scheduling can result in the amount of budget costs incurred and the length of time of the development process. The development of Building Information Modeling (BIM) technology has provided benefits in solving problems faced by the construction industry. This study aims to calculate the Quantity Take-Off and find out the difference from the calculation of costs on building structural components (concrete and rebar volumes), as well as to make simulation for work progress. The BIM software used is Cubicost TAS (Take-off Architecture Structure) to create 3D modeling and Cubicost TRB (Take-off Reinforcement Bar) for Bar Bending Schedule (BBS) calculations. Meanwhile, scheduling simulation is conducted using Autodesk Naviswork. The results showed that the 3D BIM approach resulted in a smaller total concrete volume with a difference of 2.38% (lower 41.11 m3) than the conventional method. Similarly, for rebar material needs, it showed that the difference in rebar volume is 10.83% (30236.42 kg) smaller than conventional methods. The simulation results in 3D form show that using BIM Naviswork can help monitor the work progress between the design and the field according to the planned time based on the 3D model so that it looks more real-time.

Simulasi Pengendalian Limpasan Permukaan dengan Penerapan Low-Impact Development di Kawasan Perumahan

Thu, 28 Nov 2024 00:00:00 +0700

Applying the Low-Impact Development (LID) approach in urban drainage systems can help control surface runoff, therefore mitigating the potential of flooding risk. However, its effectiveness varies widely, and various technical factors influence its performance. This study aims to determine the effectiveness and performance of LID units, namely bioretention and infiltration wells, in controlling surface runoff. The Center Park Housing area, covering an area of 11.53 hectares located in Palembang City, was chosen as the study area. The ability of the LID unit to reduce the volume and discharge of runoff, as well as the runoff coefficient, was simulated using the Storm Water Management Model (SWMM) program based on input from various design rainfall cases. There were four simulated design rainfalls, i.e. 108.76 mm (2-year return period), 133.20 mm (5-year), 149.38 mm (10-year), and 169.82 mm (25-year). The LID unit implementation scenarios were varied with the number of infiltration well units of 1 - 4 units per house plot. The number and area of bioretention units were considered constant for all scenarios. The simulation results show that the LID implementation can reduce runoff volume and peak discharge and help decrease the runoff coefficient in the study area effectively, especially in the case of lower design rainfall (2-year). The performance of the infiltration wells unit in producing runoff losses is better than the bioretention unit because its construction structure has a larger storage capacity for a similar unit area. Although the LID method is quite effective in reducing runoff, its combination with conventional methods may produce better performance, so further research that discusses this needs to be addressed.

Impact of Land Use and Land Use Change on Greenhouse Gas Emissions in Palembang City

Febrinasti Alia, Febrian Hadinata, Arief Trimahmudi, Nyimas Ida Apriani — Mon, 23 Dec 2024 00:00:00 +0700

Climate change is mainly anthropogenic mostly caused by urbanization, human activities in economics, industry, and transportation. The expansion of built-up land, deforestation and the loss of farmland are closely linked to land use and land use change. Greenhouse gas emissions produced by the land use sector can significantly affect global carbon budgets by changing the carbon storage level in terrestrial ecosystem vegetation and soil. In 2005, Indonesia was responsible for approximately 85% of carbon emissions. The Indonesian government is combating environmental issues by mandating local governments, including Palembang City, to conduct greenhouse gas inventories. Changes in land use and the amount of carbon stock in Palembang City can be taken into consideration by the Palembang City Government in dealing with climate change. Data analysis was carried out by interpreting satellite imagery SPOT-7 and classification of land use data into six classes based on AFOLU guidelines. The area derived from land use transition matrix of the period 2012-2018 is used as a basis to calculate greenhouse gas emissions. The greenhouse gas emissions were then calculated using the Gain-Loss method based on the IPCC journal as a reference. Due to land use and land use change from 2012 to 2018, Palembang City emits greenhouse gas as much as -149098.5827 Tonnes C/Year in total. Forest Land Category -26557.22425 Tonnes C/Year, Crop Land Category -112739.8894 Tonnes C/Year, Grass Land Category -32257.56413 Tonnes C/Year, Wetland Category -20721.68315 Tonnes C/Year, Settlement Category 43273.249 Tonnes C/Year and Other Land Category -95.4708 Tonnes C/Year. Inventories on greenhouse gas (GHG) emissions and absorption trends are crucial for climate change mitigation strategies in Palembang. One important strategy towards achieving net zero emissions by 2060, as initiated by the Government of Indonesia, is to curb carbon release associated with land use changes.

Pengaruh Campuran Spent Bleaching Earth (SBE) dan Semen Sebagai Bahan Stabilisasi Tanah Lempung Terhadap Nilai California Bearing Ratio (CBR)

Sarah Alwiyah, Vella Anggreana, Roza Mildawati — Sat, 04 Jan 2025 07:49:21 +0700

One method for enhancing the natural state of the soil is soil stabilization. Spent bleaching earth (SBE) is the solid waste left over after palm oil is refined for use in oleochemical industry processes. When the field test value exceeds 3% and the laboratory test value exceeds 6%, the soil strength is deemed favorable. The test results indicate that as the curing time increased, the natural soil's California Bearing Ratio (CBR) value increased as well. After 0 days of curing, the natural soil's CBR value was 11.91%; after 4 days, it rose to 12.59%; and after 7 days, it reached 13.99%. Furthermore, the soil that underwent a 4-day soak had a CBR value of 4.01%. Concurrently, the CBR value increased with increasing curing time in the mixed soil CBR test, which had a composition of 10% cement and 22.5% SBE. The mixed soil's CBR value at 0 days of curing was 12.66%. Nevertheless, the CBR value increased significantly to 22.64% after 4 days of curing. Furthermore, the CBR value increased to 27.11% after 7 days of curing. The mixed soil's CBR value was 23.52% over the course of the four-day soaking period. We can conclude that the natural soil and the mixed soil exhibit their highest CBR values following a 7-day curing period. This suggests that the CBR value is influenced by the curing time. In both soil types, a higher CBR value was noted with longer curing times.

The Environmental Evaluation of the Sp. Opi – Babatan Saudagar – Srijabo Road

Fri, 31 Jan 2025 11:49:48 +0700

The Public Works Agency for Highways and Spatial Planning of South Sumatra Province has the task of deconcentration in the field of roads and has authority over 88 roads with a length of 1,779.27 km spread across 17 districts and cities in South Sumatra Province. Not all provincial roads have an environmental evaluation document. The objective of the current research was to evaluate the environmental impact resulting from road operational activities in South Sumatra Province by taking data on ongoing activities, geological and topographic conditions, flora and fauna, socio-economic and cultural activities in the area, as well as measuring quality standards, which include air quality standards, noise, vibration, and water quality standards on the Sp. OPI - Babatan Saudagar - Srijabo Road. The conclusion of the current research shows that the ambient air quality, noise intensity, and vibration are still good and meet quality standards. The potential hydrogen (pH) and dissolved oxygen (DO) parameters in the Ogan River branch at the time of sampling for surface water quality did not meet the quality standards due to the type of soil, which tends to be acidic. Furthermore, the results of groundwater quality analysis show that the pH of groundwater measured in all locations is less than 6.5 or does not meet quality standards, which can cause an unpleasant taste when consumed, so processing is needed to increase the pH of groundwater.

The Satisfaction of Grab Users in Parepare City Using The Structural Equation Model

Nur Ayatillah, Hakzah , Andriyani, Andi Bustan Didi — Wed, 19 Mar 2025 21:53:25 +0700

The challenges faced by the city of Parepare, South Sulawesi, in providing adequate public transportation have led many residents to rely on online transportation services such as Grab. The purpose of this study was to analyze user satisfaction with Grab using Structural Equation Modeling (SEM) version 23. This quantitative research involved a sample of 247 Grab Bike users in Soreang District, with data collected through questionnaires. The analysis included validity and reliability tests as well as model fit assessment. The results indicated that the variables tangible, empathy, reliability, responsiveness, and price had a positive and significant effect on customer satisfaction, while assurance did not. The model fit test revealed that some indices met the criteria, but others did not, such as TLI, NFI, CFI, and RMSEA, which showed a poor fit.