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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan Jurnal Transportasi Jurnal HPJI (Himpunan Pengembangan Jalan Indonesia) Semesta Teknika Dinamika Teknik Sipil Astonjadro Journal of Engineering and Scientific Research (JESR) Journal of the Civil Engineering Forum JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Makara Journal of Technology Journal of Engineering and Technological Sciences
Suprapto Siswosukarto
Universitas Gadjah Mada Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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PENEMPATAN SENSOR AKSELEROMETER PADA JEMBATAN MERAH PUTIH Lautan Wijaya Nusantara, Johan; Aminullah, Akhmad; Siswosukarto, Suprapto
Jurnal Teknik Sipil Vol. 18 No. 1 (2024)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jts.v18i1.10354

Abstract

Kegiatan monitoring pada jembatan perlu dilakukan sebagai upaya dalam menjamin keamanan jembatan. Secara umum terdapat dua metode monitoring kesehatan struktur jembatan yaitu dengan melakukan Loading Test secara langsung dan melalui Structural Health Monitoring System (SHMS) yang dapat dipantau secara real time dan kontinu. Salah satu sensor yang penting dan populer dalam kegiatan SHMS adalah akselerometer. Data dari sensor tersebut dapat diproses lebih lanjut untuk mengetahui nilai frekuensi struktur, mode shape, dan displacement yang terjadi. Hal tersebut bermanfaat dalam pemantauan kesehatan struktur jembatan secara keseluruhan dan dapat dijadikan dasar penetapan kebijakan untuk pemeliharaan jembatan, serta penyusunan tindakan preventif dan kuratif. Penempatan sensor yang baik dengan jumlah sensor yang tepat harus ditentukan untuk mengetahui perilaku struktur yang sebenarnya dengan biaya yang minimal. Penelitian ini bertujuan untuk mengevaluasi penempatan sensor akselerometer pada dek Jembatan Merah-Putih yang memiliki tipe double pylon cable stayed dengan bentang 300 m yang terletak di Kota Ambon, Provinsi Maluku, Indonesia. Empat metode Optimal Sensor Placement (OSP) telah dilakukan yaitu dengan Effective Independence (EI) Method, Eigenvalue Component Product (ECP), Mode Shape Summation Plot (MSSP) Method, serta Effective Independence – Drive Point Residu (EI-DPR) Method. Dari keempat metode tersebut, didapatkan bahwa penempatan sensor yang paling optimal didapatkan dari metode EI dengan jumlah sensor yang optimal adalah berjumlah 10. Konfigurasi sensor tersebut memiliki performa yang sedikit lebih baik dari konfigurasi sensor eksisting.
Analysis of Axial Behavior in Cold-Formed Steel-Plywood Composite Walls Saputra, Muhamad Dandy Harjunaseta Hadi; Siswosukarto, Suprapto; Awaludin, Ali
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.197

Abstract

The use of bricks as a wall material has significant drawbacks, including high weight and brittleness, making them vulnerable to damage, particularly under lateral loads like earthquakes. This study focuses on evaluating the axial performance of Cold-Formed Steel (CFS)-Plywood composite walls as an alternative to traditional brick walls. The study investigates the effects of bracing on axial compressive strength through laboratory testing of two composite wall specimens: one with bracing and one without. The results show that bracing significantly improves axial load capacity, with the braced specimen sustaining a maximum load of 69.666 kN, while the unbraced specimen withstood 64.413 kN. These findings highlight the potential of CFS-Plywood composite walls to serve as a lightweight, structurally sound alternative to brick walls, especially in multistory buildings subjected to axial loading.
The Application of Alkali Activator and Admixture for High Early Concrete Compressive Strength with GGBFS Substitution Juesmin, Elvina; Satyarno, Iman; Siswosukarto, Suprapto; Nawangsasi, Ratna Dwiyani; Taufiq, Muhammad Hasan
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 2 (2025): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i2.87887

Abstract

Concrete with high early compressive strength is designed to reach at least 20 MPa within the first 24 hours after casting. However, achieving this generally requires increased cement content, which unfortunately leads to higher carbon emissions and production costs. To reduce this impact, cement can be partially substituted with pozzolans such as ground granulated blast furnace slag (GGBFS), which has a chemical composition similar to cement. Nevertheless, GGBFS exhibits a slow hydration process; therefore, an alkali activator is required to accelerate the reaction. On the other hand, alkali activation can reduce concrete workability, making the addition of admixtures such as superplasticizers necessary to maintain adequate workability. This study investigates the effect of adding alkali activators and admixtures on concrete's early compressive strength and workability of concrete incorporating GGBFS as a cement substitute. Ordinary Portland cement and GGBFS were used at a ratio of 70:30. The alkali activator consisted of NaOH and Na₂SiO₃, with a Na₂SiO₃/NaOH ratio (R) of 1.5 and a total alkali-to-GGBFS ratio (A) of 0.45. The superplasticizer was Sika® ViscoCrete®-1050 HE at at dosages of 0.5% and 1%. The alkali activator contents tested were 0%, 2.5%, 5%, 7.5%, and 10%. The paste-to-fine aggregate void ratio (Rm) and the mortar-to-coarse aggregate void ratio (Rb) were both set at 1.4. Workability was evaluated using the slump test, while compressive strength was measured at 24 hours. The results showed that the addition of an alkali activator led to a substantial improvement in the compressive strength of the concrete, reaching up to 114.8% of the minimum required early compressive strength. The compressive strength peaked at 43 MPa when 10% alkali activator was added to the mixture. However, increasing the alkali activator content significantly reduced workability, with the slump value reaching zero at the 10% dosage. The addition of a superplasticizer was proven to be necessary to maintain a balance between early strength and concrete workability.
A Flexural Behavior of Full-Scale RC Beam Strengthened Using Glass Fiber Reinforced Polymer: Experimental Research Putri, Oktalia Wuranti; Setiawan, Angga Fajar; Siswosukarto, Suprapto; Muflikhun, Muhammad Akhsin; Nor, Noorsuhada Md; Muslikh
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.22499

Abstract

Reinforced Concrete (RC) structures, though strong and economical, may need to be strengthened due to increased load demand for upgraded room functions. Strengthening an RC beam element with Glass Fiber Reinforced Polymer (GFRP) offers flexural strength enhancement, corrosion resistance, and cost efficiency. However, the study that considers the full-scale dimension of a beam strengthened with GFRP is still limited. Therefore, more studies on the flexural strength enhancement of RC beams with GFRP need to be conducted. This research investigated the flexural performance of full-scale RC beams strengthened with externally bonded GFRP. This study involved testing five beam specimens, each with a different number of GFRP layers attached to the outermost tensile zone of the cross-section. Flexural testing was conducted using a four-point bending setup with a loading–unloading scheme to capture the specimens’ elastoplastic behavior, considering recovery during unloading. The analyzed parameters included stiffness, yield strength, debonding strength, ultimate strength, and ductility. Furthermore, the flexural strength was predicted through analytical calculations based on the fiber section method, while the shear strength was estimated following the ACI 318M-14 code. The experimental results showed that GFRP strengthening considerably increased stiffness and first flexural strength of RC beams as a proportion of the number of layers during the pre-debonding state. Despite the debonding occurrence initiating a temporary lapse in the role of GFRP at 0.67% to 0.93% of displacement-span-ratio, it decreased the flexural resistance momentarily. Then, the strengthened beams with two-to-four-layer GFRP still exhibited second ultimate flexural strength enhancement within the range 14.35% to 39.22%. Furthermore, GFRP strengthening generally preserved beam ductility at the second ultimate flexural strength due to the catenary action from debonded GFRP in the plastic hinge zone. Thus, additional GFRP for strengthening RC beams could be effective in the case of a positive bending moment to enhance the stiffness, strength, and ductility
Types, Mechanisms, and Efficiency Rate of Galvanized Steel as Corrosion Protection in Atmospheric Corrosion: A Systematic Review Silaban, Trihol Oky Jones; Setiawan, Angga Fajar; Siswosukarto, Suprapto; Wiranata, Ardi; Putra, Ryan Anugrah; Priyotomo, Gadang; Kudus, Sakhiah Abdul
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.22512

Abstract

Corrosion represents a major concern in numerous industrial sectors, primarily due to the inherent vulnerability of metallic structures to degradation. Therefore, implementing effective corrosion protection measures is essential. Naturally occurring organic chemical compounds and important molecules have demonstrated strong potential for corrosion protection. Some studies indicate that those containing oxygen, sulfur, and nitrogen in the atmosphere exhibit the highest protection performance. Organic and naturally derived protection generally functions by forming protective films on metal surfaces, thereby mitigating the corrosion rate. This review emphasizes the role of galvanized coatings as effective corrosion protection with the cathodic protection method and anode sacrificial on the steel surfaces. It also includes an analysis of steel surface morphology using SEM-EDS micrographs. The review was conducted following PRISMA guidelines, with literature sources covering publications. A total of selected studies were critically analyzed to examine corrosion types, protection mechanisms, efficiency performance, and surface characterization of galvanized coatings. Both Hot-Dip Galvanizing (HDG) and Cold Galvanizing Coatings (CGC) were systematically compared in terms of corrosion rate, protective efficiency, coating thickness, and environmental aggressiveness. The paper systematically covers different types of corrosion, available protection control methods, and corrosion mitigation techniques. It further explores protective mechanisms, evaluates efficiency, and identifies the most effective control strategies. Additionally, the review discusses theoretical approaches, activation parameters, adsorption studies, and surface morphology. This review highlights key factors influencing galvanized steel performance, including coating composition, environmental parameters, and exposure duration, while also identifying current research gaps. The findings provide valuable insights for optimizing corrosion protection strategies and improving the service life of steel structures in atmospheric environments.
Addition of Alkali Activator and Substitution of GGBFS in Hydraulic Cement for High Early Flexural Strength and High Slump Concrete Keron, Maria Apolonia Palan; Satyarno, Iman; Siswosukarto, Suprapto; Nawangsasi, Ratna Dwiyani; Taufiq, Muhammad Hasan
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 22 No. 1 (2026): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v22i1.87888

Abstract

To lower CO2 emissions, the construction sector is increasingly adopting sustainable practices, such as cutting back on clinker usage in cement manufacturing. Hydraulic cement is an environmentally friendly cement material because it uses a smaller amount of clinker. The amount of industrial waste, including materials like Ground Granulated Blast Furnace Slag (GGBFS), keeps rising each year. Because of this, it is frequently used as an alternative to cement. However, concrete with GGBFS substitution generally experiences a delay in early strength development due to its low reactivity to water. To overcome this, adding an alkali activator in NaOH and Na2SiO3 is necessary. In this study, the dosage of alkali activator was varied at 0%, 2.5%, 5% and 7.5% by weight of GGBFS with R and A values set at 1.5 and 0.45. In addition, using GGBFS can also reduce the workability of concrete, so it is necessary to use a superplasticizer in the form of Sika® Viscocrete®-1050 to improve concrete flow properties. The dosage of superplasticizer used was 0.75% by weight with a target slump of 20 cm for ease of working. The amount of GGBFS used was 30% by weight. To evaluate the materials performance, test were carried out to measure the concrete workability, compressive strength of paste and concrete flexural strength after 3 days of curing. The results show that increasing the dosage of alkali activator can increase the paste compressive strength by more than 24 MPa according to the requirements of using hydraulic cement and concrete flexural strength by more than 3 MPa in 3 days. Concrete with a 7.5% alkali activator dosage can achieve a concrete flexural strength of 4.81 MPa at 3 days and has a slump value of 20 cm. This research can be a solution to reduce CO2 emissions and is useful for construction projects that require high flexural strength values at early ages and high slump.
Co-Authors Achmad Basuki Ahmad, Mohammad Ismail Ramadan Ali Awaludin Aminullah, Akhmad Ardi Wiranata Arianto, Niky Ashar Saputra Asman, Hasbi Bambang Suhendro Bambang Supriadi Bambang Supriyadi Endita Prima Ari Pratiwi Gadang Priyotomo Iman Satyarno Irawati, Inggar Septhia Juesmin, Elvina Keron, Maria Apolonia Palan Kudus, Sakhiah Abdul Latif Budi Suparma Lautan Wijaya Nusantara, Johan Muda, Johanes B Muhammad Akhsin Muflikhun Muslikh Muslikh Muslikh Nawangsasi, Ratna Dwiyani Niken Palaeowati Nor, Noorsuhada Md Pasapan, Richard Marcelenus Purba, Ronny Putri, Oktalia Wuranti Rosediana, Risky Andayani Ryan Anugrah Putra Saputra, Muhamad Dandy Harjunaseta Hadi Sari, Ardystia Maha Sari, Halima Irianti Puspita Setiawan, Angga Fajar Silaban, Trihol Oky Jones Syawal, Jus Tantisaputri, Intan Archita Taufiq, Muhammad Hasan Tuasikal, Nur Risa Cahyana Umi Khoiroh, Umi Widiana, Niza Yobelita, Naomi Yuhasnita, Angeline