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Agata Iwan Candra
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U Karst
Published by Universitas Kadiri
ISSN : 25794620     EISSN : 25810855     DOI : http://dx.doi.org/10.30737/ukarst
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
U KaRsT is a journal of the civil engineering research the University of Kadiri published twice a year in April and November. First published in April 2017. U KaRsT already has both ISSN printed and online, for ISSN (Print) is 2579-4620, and ISSN (Online) is 2581-0855.
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Articles 6 Documents
 1 
Search results for , issue "Vol. 8 No. 2 (2024): NOVEMBER" : 6 Documents clear
Enhanced Accuracy in Construction Cost Estimates Using BIM Aditya, I Komang Krisna; Triswandana, Erick; Agustini, Ni Komang Ayu
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.5771

Abstract

The Indonesian construction industry is experiencing rapid growth and increasing complexity. If done using conventional methods, this process often involves multiple manual stages that are prone to errors and inconsistencies thus requiring significant time and resources. Building Information Modeling (BIM) is a technology that provides solutions in the volume and cost estimation process. However, there have been few studies that verify the output of BIM with control calculations. This study aims to compare the volume and cost outputs from BIM with those from the Bill of Quantities (BoQ) by re-evaluating volumes identified as clashes and verifying the actual costs. Data on plan drawings, BoQ, and planned costs were obtained from a public service center building project with modeling conducted using Autodesk Revit and Naviswork. Manual volume calculations and actual cost data were used for comparison.  The results showed that the BIM cost estimate was highly accurate, with a minimal difference of IDR 1,249,901.21 (0.0032%) compared to the real cost. In contrast, the BoQ estimate was higher by IDR 1,022,985,135.58 (2.63%) compared to the real cost and IDR 1,024,235,036.79 (2.57%) higher than BIM. This is because in volume calculations, BIM software has proven to be more detailed and accurate in calculating the volume of all work items and is able to eliminate human error factors. The results of this study contribute to the construction industry by highlighting the significant advantages of using BIM software that can increase efficiency and reduce the risk of calculation errors.
Comparative Analysis of Analytical and Numerical Methods on the Safety Factor of Retaining Walls Akbar, Aulia; Wibowo, Tommy Prasetyo; Wulandari, Tika Ermita
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.5966

Abstract

The stability of retaining walls is a major concern in geotechnical design, especially in landslide-prone areas such as Indonesia. A comprehensive analysis requires an in-depth understanding of the failure mechanism and the factors that influence its stability. Therefore, a comparison of various analytical and numerical methods in the stability of retaining walls is an important step to determine the most effective approach. The data were collected through laboratory tests and field investigations of soil properties. The retaining wall design was modeled using Plaxis and Midas software. The analysis focused on comparing the safety factor values obtained from the Rankine method with those derived from Plaxis and Midas simulations. The results show that Rankine provides a high safety factor, namely 2.54 for rotation and 2.447 for shear. Rankine, although simple, remains relevant for uniform soil conditions. Plaxis can provide more detailed deformation and pressure distribution predictions with a safety factor reaching 2.95 in the third excavation stage. Meanwhile, Midas provides a comprehensive analysis of axial force and bending moment with a safety factor value that tends to be smaller. This study provides new insights into how each method can be used effectively for different technical conditions, and provides practical guidelines for geotechnical planners in choosing the appropriate analysis method to improve the efficiency and safety of retaining wall design.
Optimization of Column Stirrup Selection (Square and Spiral) for Earthquake Resistance of 10-Storey Buildings Khairunnisa, Syahla; Amalia; Saputra, Jonathan
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.5968

Abstract

Earthquake-resistant building design is very important, especially in earthquake-prone areas such as Indonesia. The shape of the column cross-section and the ties' configuration greatly affect the building's stiffness when exposed to earthquake loads. Therefore, knowing the optimal tie configuration to increase earthquake resistance is important. This study aims to analyze the structural performance of a 10-story building using columns with spiral stirrups and square stirrups. Model 1 uses columns with square stirrups, Model 2 uses spiral stirrups, and Model 3 is a combination of both. Simulations were conducted using ETABS 18 software, where the base shear force, displacement, and inter-story drift as well as the collapse pattern and performance level of the structure were analyzed using the pushover analysis method to determine the effect of each configuration on the stiffness and ductility of the columns when receiving earthquake loads. Analysis of Variance (ANOVA) analysis was carried out to ensure that the differences in seismic performance between the three models were significantly validated. The results show that Model 2 has lower displacement and base shear force values and smaller inter-story drift than the other models, and the collapse pattern and structural performance level of Model 2 are also smaller than the other models. The ANOVA results showed no significant difference between the models. This is because the differences in displacement and drift values are relatively small. These findings can provide guidance for selecting the most efficient column tie configuration for resisting earthquake loads and achieving safety levels.
Non-Destructive Test and Numerical Approach for Tailrace Safety Evaluation of Ir. H. Djuanda Dam Damayanti, Vivik Arti; Mulyawati, Fauzia
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.6191

Abstract

Dam Ir. H. Djuanda is one of the important infrastructures in managing water resources in Indonesia, with strategic functions such as flood control, irrigation, hydroelectric power plants (PLTA), and raw water supply. The lower channel (tailrace) plays a crucial role in supporting the efficiency of the dam's hydraulic system. However, previous inspections revealed erosion and exposed aggregate in the tailrace concrete layer which could threaten the stability of the structure. This research aims to evaluate the condition of the tailrace structure of Dam Ir. H. Djuanda. An evaluation was carried out by integrating the NDT method using Schmidt Hammer and numerical simulation via Plaxis 2D software. The Schmidt Hammer test data gives an average concrete quality value of 37.47 MPa, while the Plaxis 2D simulation shows that the Cartesian stress ( ,  and ) on the structure is still within safe limits. The simulation results also show a safety factor value of 1.795, which meets the structural safety criteria. These findings indicate that the tailrace concrete was designed with a high safety factor, so that it can withstand hydrostatic loads and ground pressure even though it has been in operation for more than five decades. This research shows that the combination of NDT and numerical simulation is an effective method for evaluating structural conditions without damaging the material. This approach can be adopted to inspect and maintain similar infrastructure to ensure long-term operational stability and sustainability.
Flood Risk Analysis for the Construction of the Patimban Port Access Toll Road Abdullah Dwi Noviantoro, Agung; Mulyawati, Fauzia; Savitri Nurvita, Rully
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.6192

Abstract

In recent decades, the risk of flooding in the Cipunagara River area has increased due to global climate change causing more extreme rainfall patterns. The planned construction of the Patimban Port Access Toll Road has a strategic role in supporting national logistics connectivity. However, the geographical location of the planned toll road in the lowlands near the Cipunagara River poses a significant risk to the sustainability of the infrastructure. This study aims to analyze the risk of flooding in the Cipunagara River and its impact on the design of the toll road. Hydrological analysis was carried out using rainfall data from eight observation stations for the period 2012–2021. Analysis of frequency distribution, rainfall intensity and the Soil Conservation Services (SCS) Unit Hydrograph method was carried out to calculate peak flood discharge. Modeling was carried out using Surface Water Modeling System (SMS) software. The results of the study indicate that the Cipunagara River Basin (DAS) has high rainfall variability with the potential for extreme rainfall in large return periods. The peak discharge of the 100-year return period is 1003.582 m³/second, indicating the risk of extreme flooding because it exceeds the river capacity of 309.31 m³/second. The results of flood modeling show that the flood water level in the 100-year return period reaches +8,908 meters, which confirms the need for a minimum toll road infrastructure elevation of +9,908 meters to meet the vertical clearance standard. These findings provide a significant contribution to the planning of toll road infrastructure that is more resilient to flood risks, supports operational sustainability, and reduces potential economic losses.
Performance Evaluation of Freight Train Wooden Sleepers on the BH 77 Tegineneng Bridge Pamursari, Nurmagita; Arifin Bustam, Hadyan; Nadya Karunia, Meutia; Agneshia Putri, Ananda
UKaRsT Vol. 8 No. 2 (2024): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i2.6212

Abstract

Rail transport is very important in supporting human mobility and distribution of goods for heavy loads such as coal. The BH 77 Tegineneng Bridge in Sumatra is a critical infrastructure that supports coal transportation. In its structural components, wooden sleepers are used on this bridge. The wooden sleepers used must withstand dynamic, shock, lateral, and longitudinal loads. This is to ensure the stability and operational safety of the bridge. This study aims to evaluate the performance of wooden sleepers on the BH 77 Tegineneng Bridge. A case study approach was used with field data on axle loads, including static and dynamic loads, collected and analyzed to determine the load distribution and structural response. The results show that the dynamic load with a Dynamic Amplification Factor of 1.86, coupled with a shock load reaching 56,784 kN, exerts significant stress on the sleepers. The wooden sleepers effectively absorb dynamic forces, distribute the load evenly, and demonstrate resilience under repeated loading cycles, with a maximum bearing load of 189.28 kN. These findings emphasize the suitability of wood as a sleeper material due to its elasticity and damping properties, which offers a durable and efficient railway infrastructure. This study contributes to demonstrating the characteristics of wooden sleepers as a basis for material selection in freight railway systems.

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