Jurnal Teknik Sipil

Efektivitas Drainase Vertikal sebagai Mitigasi Likuefaksi dalam Ragam Potensi Percepatan Tanah Maksimum

Chariznantya Renatra, Widjojo Adi Prakoso — Tue, 30 Dec 2025 00:00:00 +0700

Abstract

Lolu Village, located in the Palu Koro fault groove and has a stratification of soil sediment that is layered with heterogeneous characters. Between the cohesive and granular soils, forming an overlapping layer. Lolu Village has its own challenges in dealing with the potential for earthquakes and liquefaction as a result. One of the liquefaction mitigations in SNI 8460:2017 is stone columns (SC) as a vertical drainage medium that functions to accelerate the rate of pore water dissipation. However, the condition of the layered soil interspersed with cohesive soil with low permeability, presents its own challenges in determining the depth of stone columns. It is necessary to review the extent of the effectiveness of SC against Peak Ground Accelerations (PGA) that have the potential to occur in Lolu Village. The stratification of the soil and stone columns will be modelled using the Midas GTS NX. Soil layers with liquefaction potential use the UBC Sand model and SC with the Mohr Coulomb model. When the stratification modeling of the soil was shaken by cyclic loads, it was found that only the upper granular layer was liquefaction. This identifies that the thin layer of cohesive soil between the layers of granular, has a role as a shield to resist the pore water pressure of the granular soil layer underneath. The study compared the initial soil conditions against two variations in the depth of SC. It was found that the depth of the SC was passed through the thin layer of cohesive soil between the granular layers, worsening the liquefaction condition of the upper layer.

Keywords : Liquefaction, Midas GTS NX, Pore Pressure Ratio PPR, stone columns

Pelimpah ITB Golden Ratio: Inovasi Geometri Mercu Pelimpah untuk Kemudahan Perencanaan dan Kinerja Hidraulis yang Baik

Tue, 30 Dec 2025 00:00:00 +0700

Abstract

A spillway is a critical hydraulic structure used to release excess water when the water surface elevation in a dam exceeds the normal limit. The discharge capacity is strongly influenced by its geometric profile. In Indonesia, ogee and circular spillways are the most commonly used types. The ogee spillway is known for its superior hydraulic performance but features a complex geometry that requires high construction precision. In contrast, the circular spillway offers a simpler design, yet lacks a standardized reference for crest curvature ratios. To address this issue, the Golden ratio Tipe Spillway was developed by applying the constant mathematical ratio φ ≈ 1.618 to the crest profile. The aim is to create a design that is simpler, visually harmonious, and still hydraulically efficient. Evaluation was conducted through numerical simulations using Flow 3D software, validated by physical model testing in the laboratory. Results show that while the ogee spillway remains the most optimal in terms of performance, the ITB Golden Ratio Spilway types A and B demonstrate comparable discharge capacity, safe pressure.

distribution, and low cavitation risk. These advantages make it a practical and reliable design alternative

Keywords: Spillway crest, Flow-3D, physical model test, spillway design, ITB Golden ratio spilway.

Analisis Kinerja Campuran Panas Open Graded Friction Course (OGFC) Menggunakan Asbuton Murni Dengan Modifier Elvaloy (PG 82)

Siti Nuriskha Amalia, Eri Susanto Hariyadi, Nasuhi Zain — Mon, 30 Dec 2024 00:00:00 +0700

Abstract

This study aims to evaluate the performance of Open Graded Friction Course (OGFC) mixtures using Asbuton Murni modified with Elvaloy polymer (PG 82). The research focuses on analyzing asphalt binder characteristics and assessing the resistance of the mixture to functional distress (raveling) and structural distress (rutting and fatigue). The optimum asphalt content was determined in accordance with ASTM D7064/D7064M-08 through Void in Mix (VIM), Cantabro Loss, and draindown tests. Furthermore, the mixture performance was evaluated using Indirect Tensile Fatigue Test (ITFT) and Hamburg Wheel Tracking Device (HWTD) tests.

The test results indicate that the G/sin δ* value increased from 77.5 °C to 84.5 °C, signifying improved resistance to permanent deformation. In addition, the mixing and compaction temperatures decreased, thereby enhancing the workability of the mixture. The OGFC Asbuton–Elvaloy mixture satisfied the requirements for raveling resistance and exhibited a high dynamic stability of 37,526 passes/mm, exceeding the specifications of Bina Marga. However, the fatigue performance remained relatively low, with fatigue lives of 25,186 cycles at 250 kPa and 3,375 cycles at 400 kPa.

These findings demonstrate that the OGFC Asbuton–Elvaloy mixture performs well in terms of resistance to permanent deformation but has not yet fully met the criteria for a structural pavement layer. Therefore, this study recommends further development of the OGFC Asbuton–Elvaloy mixture so that it may function not only as a functional layer, but also has the potential to be developed as a structural pavement layer, with performance comparable to Bina Marga (2018) specifications for AC-WC and SMA pavements..

Keywords : Asbuton murni, Elvaloy, OGFC, VIM, Cantabro, asphalt draindown, fatigue, HWTD, rutting, dynamic stability.

Studi Identifikasi Daerah Sebaran Banjir di DAS Peusangan dengan Pemodelan HEC-RAS 2D Unsteady Flow

Ghina Rahmatika Asril, Cut Dwi Refika, Maimun Rizalihadi, Nina Shaskia — Tue, 30 Dec 2025 00:00:00 +0700

Abstract

The Peusangan Watershed is a watershed located in Aceh Province. According to data from the Aceh Irrigation Agency, the downstream area of the Peusangan Watershed frequently experiences flooding, resulting in environmental damage and significant economic losses. Flood management efforts that have been undertaken include the construction of retaining walls. Furthermore, studies are needed to assess the inundation conditions, including flood inundation modeling using HEC-RAS 2D unsteady flow software and ArcGIS 10.5 for mapping the affected areas. The modeling results indicate that the flood inundation areas for return periods of 2, 5, 10, 25, 50, and 100 years are, respectively, 37,38 km², 78,13 km², 95,17 km², 112,82 km², 120,67 km², and 126,28 km². The model validation of flood distribution points for each return period was 28,57%, 66,67%, 71,43%, 76,19%, 90,48%, and 90,48%, respectively. The mapping results based on the classification of downstream sub-districts with return periods of 2, 5, 10, and 25 years inundated two sub-districts, namely Peusangan Selatan Sub-district and Peusangan Siblah Krueng Sub-district, while the return periods of 50 and 100 years inundated three sub-districts, including Peusangan Sub-district.

Keywords : Flood, Peusangan Watershed, arcgis, HEC-RAS 2D.

Analisis Tarif Jalan Tol Yogyakarta–Bawen Berdasarkan Sensitivitas Volume Lalu Lintas Terhadap Perubahan Tarif

Teguh Wisanggeni, Russ Bona Frazila, Taufiq Suryo Nugroho — Tue, 30 Dec 2025 00:00:00 +0700

Abstract

Determining toll road rates is an important factor for the sustainability of investment and optimal benefits for users. This study analyzes the sensitivity of traffic volume to rate changes on the Yogyakarta–Bawen Toll Road using secondary data from PT Jasa Marga (Persero) Tbk and PT Jasamarga Jogja Bawen. The methods used include Ability to Pay (ATP) and Willingness to Pay (WTP) determination, time value determination, and macro transportation modeling with PTV Visum. The results show that an increase in toll rates reduces traffic volume, but there is an optimum point that generates maximum revenue. The optimal toll rates for Class I vehicles is projected to be IDR 1,400/km in 2029 and IDR 2,130/km in 2039, assuming that the time value follows inflation. These findings indicate that higher toll rates during the initial operational phase do not necessarily result in maximum toll revenue, thus requiring periodic evaluation of the toll setting policy.

Keywords : Toll road, toll rate, traffic volume sensitivity, toll revenue, traffic modelling.

Kajian Kelayakan Seismik dan Penyusunan Sambungan Tipikal Bolted Flange Plate Pada Sistem SRPMK Menggunakan Profil Baja Indonesia

Dyah Kusumastuti, Randy Tenderan, Naufal Yusviansyah Mahib, Andi Alfian Jayusman — Tue, 30 Dec 2025 00:00:00 +0700

Abstrak

Indonesia merupakan negara dengan tingkat aktivitas seismik tinggi, sehingga perancangan struktur baja tahan gempa menjadi sangat penting. SNI 7860:2020 dan SNI 7972:2020 menetapkan bahwa sambungan balok-kolom dalam Sistem Rangka Pemikul Momen Khusus (SRPMK) harus menggunakan sambungan terprakualifikasi atau diuji untuk memastikan kekakuan dan kapasitas rotasinya. Penelitian ini bertujuan untuk mengkaji kesesuaian profil baja berdasarkan SNI 9150 terhadap perencanaan sambungan Bolted Flange Plate (BFP), salah satu tipe sambungan terprakualifikasi. Studi dilakukan dengan menganalisis berbagai kombinasi profil balok dan kolom berdasarkan persyaratan seismik berupa ketentuan geometri, kapasitas momen plastis, dan rasio strong column-weak beam (SCWB). Hasil evaluasi menunjukkan bahwa profil yang memenuhi seluruh persyaratan terbatas, dengan kendala utama teridentifikasi pada kelangsingan kolom yang mengurangi kapasitas momen plastis. Temuan ini menegaskan perlunya strategi pemilihan profil baja yang lebih selektif serta potensi pengembangan kebijakan produksi baja untuk mendukung penerapan sambungan terprakualifikasi di Indonesia.

Kata-kata Kunci : Struktur baja, Sistem Rangka Pemikul Momen Khusus (SRPMK), sambungan momen balok-kolom, Bolted Flange Plate (BFP), persyaratan seismik

Evaluasi Kinerja dan Dampak Jeti Muara Sungai Bogowonto terhadap Perubahan Garis Pantai

Wakhidatik Nurfaida, Estu Wijayanti, Hafizh Maulana Ihsan, Tania Edna Bhakty — Tue, 30 Dec 2025 00:00:00 +0700

Abstrak

Penutupan muara sungai menimbulkan masalah apabila terdapat infrastruktur penting di dekatnya, seperti Bandara Yogyakarta International Airport (YIA) yang terletak di sisi timur muara Sungai Bogowonto. Sebagai usaha mitigasi, telah dibangun jeti sepanjang 300 m untuk mencegah penutupan muara. Setelah beberapa tahun dibangun, keberhasilan kinerja jeti penting untuk dievaluasi. Penelitian ini terdiri dari analisis citra satelit melalui program CoastSat, analisis karakteristik gelombang berdasarkan data ERA5, pemodelan DELFT3D, serta observasi lapangan. Data ERA5 menunjukkan bahwa tinggi gelombang dapat mencapai 3,5 – 4 meter pada musim badai, periode rerata sebesar 9 – 11 detik, arah gelombang dominan dari selatan. Arus lokal yang datang dari arah timur ke barat mempengaruhi arah dominan transpor sedimen ke arah barat. Hal ini juga tampak pada hasil pemodelan DELFT3D. Berdasarkan analisis citra satelit, terlihat penumpukan sedimen di kedua sisi. Meskipun pada umumnya diprediksi bahwa akan ada erosi di sisi barat (downdrift), tetapi hingga penelitian ini ditulis, tidak tampak adanya erosi yang terjadi. Laju perubahan penumpukan sedimen di sisi timur jeti adalah sekitar 12 m/tahun, sedangkan di sisi barat jeti adalah sekitar 9,5 m/tahun. Studi ini menyimpulkan bahwa jeti muara Sungai Bogowonto bekerja dengan baik dalam mencegah penutupan muara, dan hingga saat ini tidak tampak adanya dampak erosi akibat bangunan tersebut.

Kata-kata Kunci : Jeti, mitigasi bajir, penutupan muara sungai, transpor sedimen, YIA

Earth Wall dengan Tanah Marginal dengan Pengujian Skala Penuh

Nastiti Tiasundari, Widjojo A Prakoso, Dandung Sri Harninto — Tue, 30 Dec 2025 00:00:00 +0700

Abstrak

Mechanically Stabilized Earth Wall (MSE Wall) banyak dilakukan sebagai salah satu alternatif dinding penahan tanah. Ketidaktersediaan material granular bergradasi baik sesuai dengan persyaratan menyebabkan penggunaan tanah marginal tidak dapat dihindari. Penelitian ini bertujuan untuk melihat performa dari MSE Wall dengan timbunan tanah marginal. Pada penelitian ini akan dilakukan pembuatan model dinding dengan tinggi 3 m menggunakan timbunan tanah marginal clayey silt. Perkuatan yang akan digunakan adalah strip geosintetik yang terbuat dari anyaman benang polyester kuat tarik tinggi dengan kuat tarik 50 kN, panjang penjangkaran 3 m (1H), spasi vertikal 0,6 m, dan spasi horizontal 0,6 m. Pembebanan akan dilakukan secara bertahap dari mulai 10 kPa, 20 kPa, hingga 30 kPa. Proses saturasi akan berlangsung selama 5 hari setelah pembebanan terakhir dilakukan. Monitoring akan dilakukan terhadap pergerakan dinding, gaya aksial tarik yang terjadi pada perkuatan, dan tekanan yang terjadi pada dinding. Gaya tarik aksial terjadi paling besar pada layer bagian atas yang disertai dengan pergerakan dinding ke arah dalam facing pada akhir proses saturasi dikarenakan turunnya tegangan efektif, berkurangnya kuat geser, terjadinya settlement akibat beban, dan efek suction yang berkurang.

Kata-kata Kunci: Infiltrasi air, MSE Wall, strip geosintetik, tanah marginal, tanah yang diperkuat

Studi Perbandingan Sistem Lisensi Kontraktor Konstruksi di Indonesia, Singapura, dan Malaysia

Giffary Otslan, Iris Mahani — Thu, 22 Jan 2026 00:00:00 +0700

Abstract

To ensure quality, public safety, competence and responsibility of construction, every country implements a licensing system for construction contractors. In Indonesia, regulations on contractor licensing are regulated by the Construction Services Development Agency (LPJK), under the Ministry of Public Works and Housing (PUPR). Its primary objective is to ensure public safety by verifying that business entities possess adequate competence and accountability. This research aims to compares Indonesia's contractor licensing system with those of Malaysia and Singapore, identifying challenges such as limited understanding of licensing concepts, complex bureaucracy, and suboptimal implementation. Employing literature reviews, focus group discussions, and surveys, the research highlights best practices from Malaysia and Singapore—notably the single authority and single fee system—as models for reforming Indonesia's system. Using SWOT analysis, the study proposes strategic recommendations including certification requirement relaxation for business entity, enhanced information dissemination, and digital platform development. These reforms aim to improve Indonesia's licensing efficiency, support a healthy construction ecosystem, and enhance global competitiveness.

Keywords: Comparative analysis, contractor licensing system, Indonesia, Malaysia, Singapore, strategic recommendations.

Identification of Performance Indicators for Small and Medium-Scale Contractors in Indonesia

Ima Fatima, Aisha Fadila Rahmadani, Salma Azzahra — Tue, 30 Dec 2025 00:00:00 +0700

Abstract

Small and medium-scale contractors in Indonesia face significant challenges in performance measurement, as their assessments are often limited to financial metrics and lack a structured system. This study aims to identify key performance indicators (KPIs) relevant to such contractors as an initial step toward developing a Balanced Scorecard-based performance measurement system. Data were collected through questionnaires distributed to 28 respondents from 20 contractor companies in Bandung City. The analysis employed comparative tests to ensure consistency across respondent groups, statistical analysis to evaluate relevance and agreement levels, and the Relative Importance Index (RII) to rank indicators according to their perceived importance. The results identified 20 relevant performance indicators, covering all four Balanced Scorecard perspectives: financial, customer, internal business process, and learning and growth. The top-ranked indicators include service quality, customer retention, project completion timeliness, and corporate image. These findings provide a foundation for designing a comprehensive performance measurement system tailored to small and medium-scale contractors. Furthermore, they highlight the need for future research to validate the indicators with broader samples and to operationalize them into a practical measurement framework that can enhance contractor competitiveness.

Keywords : Balanced scorecard, key performance indicator, small and medium-scale contractor