SONDIR

PERENCANAAN KABEL PADA JEMBATAN SUNGAI NUNUKAN TIPE PELENGKUNG TUNGGAL

2026-01-17T20:10:43+07:00

Perencanaan Jembatan Sungai Nunukan dirancang dengan tipe jembatan pelengkung kabel. Data awal perencanaan meliputi panjang total jembatan 240 m dan lebar 9,5 m. Struktur utama jembatan berupa rangka pelengkung dengan profil box yang dirangkai menjadi satu kesatuan, serta dihubungkan oleh kabel penggantung untuk menyalurkan beban dari lantai kendaraan melalui gelagar memanjang, gelagar melintang, dan gelagar tepi ke struktur pelengkung. Dalam perencanaan kabel penggantung, aspek yang diperhitungkan meliputi dimensi kabel, sistem sambungan, serta perilaku kabel akibat beban tidak simetris maupun kondisi tegangan yang tidak sesuai saat pemasangan atau pemeliharaan. Dari hasil analisis diperoleh dimensi kabel penggantung yang sesuai yaitu Dyform 6 × 7 IWRC Bridge Rope dengan diameter 60 mm.

Performance Evaluation of Signalized Intersections Using the PKJI 2014 Method and PTV VISSIM Software (CASE STUDY: JL. WILIS – JL. KELUD – JL. KAWI – JL. KH. HASYIM ASYARI, TULUNGAGUNG REGENCY)

2026-01-11T12:15:11+07:00

ABSTRAK

Kabupaten Tulungagung merupakan salah satu kabupaten di Provinsi Jawa Timur. Perkembangan kawasan pariwisata yang semakin luas mengakibatkan semakin banyaknya wisatawan yang datang ke Kabupaten Tulungagung. Namun, dalam praktiknya, masih banyak permasalahan yang terjadi di Kabupaten Tulungagung, salah satunya adalah seringnya terjadi kemacetan lalu lintas, terutama pada titik dan waktu tertentu, atau jam sibuk. Berdasarkan hasil analisis dan perhitungan pada simpang Cuwiri, diperoleh karakteristik simpang tersebut dengan menggunakan metode PKJI 2014, yaitu arus lalu lintas kendaraan puncak tertinggi dalam 3 hari adalah hari Rabu, 12 Maret 2025 pukul 16.00-17.00, sebesar 1475 smp/jam. Derajat kejenuhan pada lengan utara, timur, selatan, dan barat masing-masing sebesar 0,71, 0,51, 0,93, dan 0,93. Panjang antrian pada lengan utara, timur, selatan, dan barat masing-masing adalah 62 m, 40 m, 102 m, dan 77 m, dengan tundaan rata-rata di simpang Cuwiri sebesar 61,289 detik/kendaraan, (tingkat pelayanan F), sehingga dikategorikan belum memenuhi persyaratan yang ditetapkan oleh Peraturan Menteri Perhubungan No. 96 Tahun 2015, yaitu tingkat pelayanan paling sedikit D. Karena tingkat pelayanan pada simpang tersebut masih belum memenuhi persyaratan. Alternatif yang efektif untuk kinerja simpang Cuwiri adalah dengan mengubah waktu siklus masing-masing lengan dan merencanakan perubahan fase mulai lambat pada lengan utara dan timur pada simpang tersebut dengan panjang antrian rata-rata 47,30 m di utara, 68,71 m di selatan, 33,74 m di barat, dan 41,36 m. Derajat kejenuhan rata-rata sebesar 0,61, tundaan rata-rata sebesar 34,59 detik/kendaraan, maka telah memenuhi persyaratan dengan tingkat minimal D.

Ke _$ ywords: Kinerja persimpangan, Persimpangan bersinyal, PKJI 2014, Vissim

TIME AND COST PLANNING OF BRIDGE SUBSTRUCTURE USING THE PRECEDENCE DIAGRAM METHOD (PDM)

2026-01-28T13:41:52+07:00

Construction project delays are often caused by suboptimal time and cost planning, particularly in substructure works, which serve as the initial phase in infrastructure development. This study aims to analyze the total duration and estimated cost of the substructure construction of the Dirung Bakung 2 Bridge in Murung Raya Regency using the Precedence Diagram Method (PDM). The data used includes detailed engineering drawings (DED), unit price analyses (AHSP 2024), and technical specifications, while scheduling was conducted using Microsoft Project software. The analysis involves identifying the logical sequence of each activity, defining interdependencies, calculating the critical path, and estimating the total time and cost required for completion. The results indicate that the execution of the substructure works requires 30 working days with an estimated total cost of IDR 1.057.109.192,21. The application of the PDM proved effective in developing an efficient project schedule and provided a clear and systematic visual representation of the dependencies between construction activities. This research is expected to serve as a technical reference for planning substructure works in similar infrastructure projects.

ALTERNATIVE STUDY OF SUPERSTRUCTURE DESIGN FOR A BRIDGE USING PRATT TRUSS-TYPE STEEL FRAME

2026-01-11T12:43:27+07:00

The Tlogomas Bridge began construction in 2021 and has been operational since 2022. This bridge connects two areas in Malang City, namely Tunggulwulung and Tlogomas. The bridge uses concrete construction type with PCI girders, installed using launcher method. The Author proposes an alternative design for the bridge using a Pratt Truss steel framw, taking reference from the Besuk Kobo’an Bridge, which also uses Pratt Truss steel structure. The bridge design is based on the Load and Resistance Factor Design (LRFD) method. In planning this bridge, the analysis was conducted using STAAD Pro V8i software dan refers to SNI 1725:2016 for calculating loads on the bridge, as well as SNI 1729:2020 for the design of connections between girders. The superstructure planning of the Tlogomas Bridge includes the design of the deck slab, longitudinal girders, transverse girders, main girders, wind bracing, connections, and pot bearings. Based on the analysis results, the specifications are as follows, deck slab main reinforcement D16-200 and distribution reinforcement D12-100, longitudinal girders WF 500 × 200 × 10 × 14, transverse girders WF 900 × 300 × 16 × 28, main girders and edge longitudinals girders box section 1500 x 800 x 50, upper transverse girders H-BEAM 250 x 250 x 9 x 14, vertical members HWF 700 × 900 × 30 × 35, diagonal members HWF 700 × 900 × 30 × 35, upper wind bracing Pipe Ø216 × 13, lower wind bracing 2L 150 x 150 x 15, pot bearings fixed pot bearing 67 x 360 mm and multi-directional pot bearing 143 x 880 mm.

PENGGUNAAN ALAT BERAT ALAT BERAT PADA OPTIMALISASI PEKERJAAN PEKERJAAN TANAH BANGUNAN AIR

2026-01-14T08:05:57+07:00

The construction project of the diversion structure for Bagong Dam in Trenggalek Regency is a project owned by the Ministry of Public Works and Public Housing (PUPR), under the Directorate General of Water Resources, BBWS Brantas, and the SNVT Dam Construction – PPK Dam 1, with the contractor being the joint operation of PT PP – PT Jatiwangi (KSO). Bagong Dam is being built with the primary objective of providing agricultural and raw water needs in Trenggalek Regency, East Java. In addition, the dam also functions as flood control, a source of irrigation, a hydroelectric power plant (PLTA), and has the potential to become a new tourist destination.The dam is designed to supply irrigation water to 1,021 hectares of agricultural land in Trenggalek. With a storage capacity of 17.4 million cubic meters, the dam is capable of reducing the flood discharge of the Bagong River by up to 78.44%. Proper optimization of heavy equipment is required to realize the project in a timely and cost-efficient manner. The author developed a plan to optimize the use of heavy equipment, scheduling, and budget estimation, specifically for the earth excavation works of the diversion structure, which includes the inlet, outlet, and tunnel sections. The data required for determining the optimal use of heavy equipment includes project drawings, work plans, the 2022 unit wage price list for Trenggalek Regency, and the productivity rates of the heavy equipment used. The planning of equipment combinations was carried out using an optimization method.The optimization results determined the most cost- and time-efficient heavy equipment selection. The project is planned to be completed within 59 weeks or 413 working days, with a total cost of IDR 23,752,970,716.

Keywords : Heavy Equipment Optimization, Earth Excavation, Diversion Structure, Trenggalek

STUDI PENELITIAN KUAT TEKAN BETON GEOPOLIMER

2026-01-11T12:46:35+07:00

This study aims to analyze the effect of variations in the water-to-cementitious (W/C) ratio on the compressive strength of fly ash-based geopolymer concrete using a mixed activator of 10 M potassium hydroxide (KOH) and sodium silicate (Na₂SiO₃) at 3 and 7 days of curing age. The research was conducted with variations of the W/C ratio, namely 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and 0.65. Fly ash was used as the main aluminosilicate material, while the alkaline activator consisted of a 10 M KOH solution and Na₂SiO₃ in a specific ratio. The samples were cast in cylindrical molds and cured at room temperature. The compressive strength test was carried out at 3 and 7 days of age.The results showed that variations in the W/C ratio significantly affected compressive strength. The highest compressive strength was obtained at a W/C of 0.35, with an average of 29.10 MPa at 3 days, increasing to 33.38 MPa at 7 days. Conversely, the W/C of 0.65 produced the lowest compressive strength, which was 17.68 MPa at 3 days and 23.19 MPa at 7 days. The 10 M KOH activator combined with Na₂SiO₃ proved effective in accelerating the formation of aluminosilicate bond structures, enabling early strength to be achieved in a short time.This study confirms that the water-to-cementitious (W/C) ratio has a significant effect on the compressive strength of geopolymer concrete, where a higher W/C ratio results in lower compressive strength.

Keywords: Geopolymer Concrete, Compressive Strength, Alkali Activator, Fly Ash, Water Cementitious Factor (W/C).