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Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan
Published by Universitas Islam Lamongan
ISSN : 25032399     EISSN : 26207222     DOI : https://doi.org/10.30736/cvl
Core Subject :
Jurnal Penelitian Teknik Sipil UNISLA (ISSN2503-2399) adalah jurnal ilmiah yang bertujuan untuk mengkomunikasikan hasil dan riset teknologi dalam rangka untuk pengembangan teknologi di bidang teknik sipil. Sasaran pembaca adalah para ilmuwan, akademis, serta praktisi dari bidang teknik sipil sebagai berikut: Rekayasa Struktural, Teknik Geotek, Rekayasa Sumberdaya Hidrolik dan Air, Rekayasa Transportasi, dan Manajemen Konstruksi.
Arjuna Subject : -
Articles 177 Documents
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Hydrological Discharge and Hydropower Capacity Assessment for Sustainable Watershed Management Saputri, Utamy Sukmayu; Niar Armayanti; Thomasonan Lutfie Prananto
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1583

Abstract

The fluctuation of Cicatih River discharge presents a significant challenge in maintaining the operational performance of the Ubrug Hydropower Plant (HPP) in Sukabumi. Dependence on seasonal variations directly influences turbine efficiency and the continuity of electricity generation. This study aims to analyze the existing discharge of the Cicatih River, determine the efficiency of Ubrug HPP turbines, and evaluate the optimal discharge based on seasonal conditions. A quantitative approach was applied using the F.J. Mock hydrological simulation method to estimate discharge from rainfall data, potential evapotranspiration (PET), and watershed characteristics. Turbine efficiency was assessed through comparison of theoretical and actual power output during 2015–2024. Findings indicate that annual discharge varied from 12.13 m³/s to 17.65 m³/s, with turbine efficiency ranging between 83% and 86%, averaging 85.1%. The optimal discharge for maximum generation (≥15 m³/s) occurred mainly during the rainy season, whereas in the dry season discharge averaged about 12 m³/s, falling below the optimal threshold and reducing electricity output. Overall, the Ubrug HPP demonstrates stable and relatively high turbine efficiency, but maximum capacity is limited by seasonal discharge availability. Hence, integrated water management strategies are required to secure sustainable power supply and enhance operational efficiency of the plant.
Comparison of the Effectiveness of Immersion Curing and Burlap Sacks Curing on the Compressive Strength of Concrete with Superplasticizers Darayani, Dhiafah Hera; Juanita; Hafiz Hamdani; Cindrawati
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1599

Abstract

This study aims to examine the effectiveness of two concrete treatment methods with SikaCim superplasticizer on concrete compressive strength. The curing method was used by immersion in water and covering the concrete surface with wet gunny sacks. The compressive strength test was conducted when the concrete was 28 days old. The concrete used is normal concrete and normal concrete with additives. This study tested concrete with 24 cylindrical specimens (15 cm x 30 cm). The results of the concrete compressive strength study show that the values of normal concrete soaked in water, with normal concrete covered with burlap sacks shows an increase of 30.6%. For comparison, the concrete treatment of added superplasticizer soaked in water, with the concrete added superplasticizer covered with burlap sacks, increased by 25.4%. The conclusion is that the highest compressive strength occurs in concrete with superplasticizer additives, with treatment covered with wet burlap sacks, which is 25.57 MPa.
Plastic Waste-Based Paving Blocks: Towards A Sustainable Circular Construction Material Joey Limbongan; Firman, Risman; Muhammad Ali Taufan
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1615

Abstract

This study introduces a method using layered plastic blending technology to combine three primary types of plastic waste (PET, PP, and LDPE) with sand. The objective is to analyze the effects of plastic-sand composition variations on the mechanical properties of paving blocks, including water absorption, compressive strength, and abrasion resistance. The research was conducted experimentally through a plastic melting and hot-mixing process with sand using four composition ratios: 100% plastic: 0% sand, 75% plastic: 25% sand, 50% plastic: 50% sand, and 25% plastic: 75% sand. Results indicate that the 75% plastic: 25% sand mixture has the highest compressive strength of 11.64 MPa. The 100% plastic: 0% sand mixture exhibited the lowest absorption (<3%) and the best abrasion resistance (<0.062 mm/min). Increasing sand content generally reduced mechanical performance due to the inadequate distribution of plastic in coating the aggregate particles. Overall, plastic waste-based paving blocks demonstrate strong potential as an alternative construction material. Nevertheless, long-term environmental durability testing is recommended to ensure their applicability under real field conditions.
Seismic Performance Evaluation Of Building Structures Modified With Special Concentrically Braced Frames (SCBF) Septiarsilia, Yanisfa; Susanti, Eka; Fitriyah, Dita Kamarul; Dewi Pertiwi; Umbu Miron
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1617

Abstract

The Concentrically Braced Frame (CBF) system utilizes diagonal steel bracing members to enhance structural stiffness and dissipate seismic energy, thereby reducing potential damage to primary structural elements. CBF systems are classified into Special Concentrically Braced Frames (SCBF) and Ordinary Concentrically Braced Frames (OCBF), which are applied in high and moderate-to-low seismic regions, respectively. This study evaluates the modification of an existing 13-story hotel building into an SCBF system in accordance with the latest Indonesian seismic design provisions. The research methodology includes a literature review on SCBF design principles and the most recent SNI standards, preliminary design, numerical modeling, and dynamic analysis using SAP2000. The structural behavior parameters evaluated in this study include mass participation, fundamental period (time period), and interstory drift. The results indicate that both the existing structure with a Dual System (SMRF and shear wall) and the SCBF-modified structure satisfy the minimum 90% mass participation requirement specified in SNI 1726:2019, with the SCBF system achieving this criterion using fewer vibration modes. However, the evaluation of the fundamental period shows that the existing structure remains within the allowable code limits, whereas the SCBF-modified structure exceeds the maximum permitted fundamental period, indicating increased structural flexibility and insufficient lateral stiffness. In terms of interstory drift performance, both structural systems comply with the drift limits specified in SNI 1726:2019; nevertheless, the Dual System demonstrates superior lateral deformation control compared to the SCBF system. Therefore, it can be concluded that the structural modification using the SCBF system in this study was not successful in replacing or outperforming the existing Dual System. Although the SCBF configuration meets certain code requirements, it does not provide adequate lateral stiffness nor improved seismic performance compared to the original structural system.
A Spatial Optimization Framework for Bus Stop Locations: Enhancing Urban Mobility in Jember Alfiah, Rindang; Graha, I Made Satya; Listyawati, Ratih Novi; Zafira, Nurul
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1618

Abstract

Jember's urban area has experienced economic development and has become the third-largest educational hub in East Java. To address the transportation congestion caused by large activities in urban areas, an effective and affordable public transportation system is essential. The coverage of bus stops plays a key role, as evident from their proximity to residential and public areas, as well as the reach of passengers. This research aims to evaluate the coverage of bus stops in the Jember urban area and optimize the locations of new stops. Using the network analyst service area, buffer area, and kernel density, the research defines service coverage within a 400-meter area based on a person's willingness to walk. Additionally, the scoring method used to evaluate the feasibility of bus stops is based on the standardization of bus stop design. The results show that 10 bus stops are not suitable for standardization, while the other nine are moderately suitable. Currently, only 48.7% of the urban area is served by public transport stops. The studies proposed 12 new bus stop locations, which will increase the coverage area to 79.1% and cover 216 out of 273 identified facilities. 
Estimation of Erosion Hazard Levels in the Ulakan Watershed, Padang Pariaman Mulia Sari, Fadila; Darwizal Daoed; Septi Wila Zarinda
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1628

Abstract

High rainfall can trigger flooding and riverbank erosion, particularly in flood-prone areas of Padangpariaman Regency, such as Ulakan Tapakis, Nan Sabaris, and 2x11 Enam Lingkung Districts. This study aims to estimate the level of erosion hazard based on land cover changes in 2015, 2019, and 2024. The analysis was conducted using the Universal Soil Loss Equation (USLE) method integrated with Geographic Information Systems (GIS). The estimation results indicate that the area classified under very low and low erosion categories has decreased, while the moderate, high, and very high erosion categories show a significant increase in erosion potential from year to year. This condition needs to be properly addressed to prevent the occurrence of potentially serious disasters.
Development of an ANFIS-Based Method to Improve the Accuracy of Owner’s Estimated Cost in Construction Cost Management Markhaban Siswanto; Machrus Ali
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 1 (2026): MARET
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i1.1636

Abstract

An inaccurate Owner’s Estimate Cost (OEC) often triggers procurement failures in the purchasing process, thereby affecting cost performance and the success of government capital expenditure projects in Indonesia from a construction management perspective. The OEC serves as the primary benchmark for assessing the reasonableness of bids in construction procurement; calculation errors may lead to ineffective cost control, financial mismanagement, and regulatory non-compliance. Therefore, this study aims to improve OEC accuracy by developing an Adaptive Neuro-Fuzzy Inference System (ANFIS) model supported by a Linear Regression (LR) algorithm to predict price fluctuations that influence cost planning and procurement decisions for public building projects. Project data from state-owned building construction and unit price analysis data for the 2021–2024 period were analyzed to predict 2025 price changes (addenda) for various construction work items. The proposed model achieved strong accuracy, with Root Mean Squared Error (RMSE) values of 0.0108–0.0333 and Mean Absolute Error (MAE) values of 0.0099–0.0261 across multiple work descriptions, indicating a good model fit. These findings confirm that the model outperforms comparable studies in terms of precision and interpretability, and can serve as a data-driven approach to strengthen cost management, estimate planning, and procurement decision-making in construction management.

Page 18 of 18 | Total Record : 177

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