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All Journal IPTEK The Journal of Engineering Journal of Civil Engineering Civil Engineering Journal Jurnal Aplikasi Teknik Sipil Sewagati Jurnal Teknik Sipil Advance Sustainable Science, Engineering and Technology (ASSET)
Yuyun Tajunnisa
Departemen Teknik Infrastruktur Sipil, Fakultas Vokasi, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Public Health Social Sciences Transportation Other

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Evaluasi Struktur Beton Outfall Condenser di PLTU Tarahan Muhammad Sigit Darmawan; Nur Achmad Husin; Ridho Bayuaji; Dicky Imam Wahyudi; Srie Subekti; Ibnu Pudji Rahardjo; Sungkono Karsidi; Sulchan Arifin; R. Buyung Anugraha Affandhie; Yuyun Tajunnisa
Sewagati Vol 4 No 3 (2020)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.497 KB)

Abstract

Sistem kerja PLTU menggunakan dua komponen, yaitu komponen utama dan komponen pendukung. Salah satu komponen pendukung adalah outfall discharge tunnel (outfall condenser). PLTU UPP Tarahan telah menetapkan PT ITS Tekno Sains (ITSTS) untuk melakukan assessment pada outfall condenser karena berada di lingkungan korosif dan telah beroperasi selama 12 tahun. Langkah assessment yang dilakukan yaitu (1) survei pendahuluan dan pengumpulan data sekunder, (2) survei lapangan, (3) pengujian lapangan dan pengambilan sampel (data primer), (4) melakukan pengujian di laboratorium, (5) melakukan pemodelan dan analisis struktur, (6) melakukan perhitungan sisa kekuatan struktur akibat korosi, (7) usulan metode perbaikan serta (8) estimasi biaya perbaikan. Hasilnya, retak pada outfall condenser pada hasil inspeksi visual umumnya dapat dimasukkan dalam kategori ringan dan hanya beberapa titik yang sudah masuk kategori berat karena tulangannya sudah mengalami korosi dan terbuka. Pengujian destructive maupun non-destructive menunjukkan kekuatan beton sudah diatas mutu yang direncanakan yaitu sebesar 21 MPa. Namun, hasilnya belum memenuhi syarat mutu beton untuk lingkungan air laut. Perkiraan kekuatan elemen struktur outfall condenser dengan memperhitungkan efek korosi menggunakan skenario average case yang menunjukkan tidak mengalami penurunan kekekuatan yang signifikan. Hasil assessment tes menyimpulkan bahwa kekuatan beton diatas mutu perencanaan yaitu 21 MPa, namun, hal tersebut masih belum memenuhi syarat mutu beton untuk lingkungan air laut. Perhitungan kekuatan elemen struktur memperhitungkan efek korosi dengan skenario average case. Hasil menunjukkan bahwa tahun 2020 kekuatan outfall condensor berkurang menjadi sebesar 91% dari kekuatan awal. Tahun 2025 menjadi sebesar 82%, dan tahun 2030 menjadi sebesar 74% dari kekuatan awal.
Performance based design of Hospital Building in Surabaya under variety design alternative using SNI 1726-2019 – Case study: Redesign Building Sigit Darmawan; Raden Buyung Darmawan; Ridho Bayuaji; Yuyun Tajunnisa; Indra Komara; Sita Auliyah Rahmasari
IPTEK The Journal of Engineering Vol 9, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i2.a16231

Abstract

Nowadays, At the present time, the occurrence of regular earthquakes all over the world is turning into a significant problem. The structures that make up hospitals are among the most significant buildings in a living society because, in the event that a potentially dangerous scenario emerges, they help to serve as a caring and healing unit for the human population. A hospital building is made up of three different components: the structural component, the non-structural component, and the functional component. Each of these components can have an effect, either directly or indirectly, on the management and operation of the hospital building. Each time a natural or non-natural cause causes devastation and disaster, the globe suffers. In such cases, hospital buildings are vital in term of treating victims and injured persons, and housing those who lost their homes. Therefore, hospital facilities should be planned and constructed with enough stiffness and strength to resist disasters and serve as shelters or housing units afterward. This study analyses a hospital in area of Surabaya which built using Indonesian standard provision SNI 1726-2012. Weak structural members of the hospital are identified. The analysis determined to study the behaviour of hospital building when subjected to seismic forces using ETABS using current provision SNI 1726-2019. The investigation determined that the effect of the lateral forces under P-delta effect on the hospital building. Two different conditions have been compared, e.g., existing model and alternative configuration using dual system method to determining the recommendation for current building to resist seismic forces under new regulation. As a result, existing structure of hospital building still meet the requirements, but to fill the condition in accordance with SNI 1726-2019, some modifications need to be improved.
Workability Analysis of 3D Printing Materials for Applications in The Construction Industry Yuyun Tajunnisa; Ridho Bayuaji; Hendro Nurhadi; Beta Rahayuning Pratiwi
IPTEK The Journal of Engineering Vol 9, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i2.a16185

Abstract

The development of 3D Printing machine technology as a printing tool that uses an additive manufacturing method system with the aim of producing a three-dimensional (3D) object or object according to the default digital design file. 3D Printing was created to facilitate construction work, with 3D Printing construction work becoming lighter because this tool saves time, and costs, and reduces the risk of work accidents. With 3D Printing, work runs quickly and avoids problems in the development process. In the last few decades, many developed countries have used 3D Printing technology in making buildings. The 3D printing process basically consists of three different stages namely, data preparation, material preparation and transfer to the printer, and the printing stage. In the data preparation stage, the components are designed as 3D CAD models, then converted to STL (Stereolithography) format and sliced with the desired layer depth. The preparation of concrete involves mixing and placing it into a container. Once fresh concrete has been placed into the container, it can be channeled smoothly through a pump-pipe-nozzle system to print self-compacting concrete filaments, which build structural components layer by layer. The material used in this 3D printing method was Portland cement where this cement is easy to find among the public. Portland cement itself is the cement that is commonly used as a basic material for making concrete, plaster, mortar, and non-specialized mortar. In addition, fly ash and silica fumes are also added as a mixture. The addition of silica fumes increases the compressive strength of concrete. Furthermore, the addition of fly ash to the concrete has the effect of reducing drying shrinkage; but reducing the compressive strength of the concrete. In this study, the author focuses on the workability of 3D Printing concrete materials, and the impact of the material was added with additional type C fly ash and silica fume, namely flowability. The result is a concrete mix design that has good flowability value to be applied to the 3D Printing method
Performance of High-Damping Rubber Bearings for Seismic Isolation – Case Study of Nayumi Sam Tower Malang Apartment Ibnu Pudji Raharjo; Yuyun Tajunnisa; Indra Komara; Geralda Nurry Arifa; Sungkono Sungkono; Dicky Imam Wahyudi
IPTEK The Journal of Engineering Vol 9, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i3.a16233

Abstract

The base-isolation system is a highly effective earthquake-resistance technique. Especially when the building is under soft soil, however, it is detrimental to the horizontal displacement control of the isolation layer and less effective in decreasing the seismic response of the superstructure. Rubber bearings with high damping can produce substantial hysteretic damping and exhibit a hardening effect at high-shear strains. The research investigates the Nayumi Sam Tower Malang apartment as a case study with 10 stories of reinforced concrete with a double system structure which is in a soft soil location. High-damping rubber bearings (HDRBs) is used as a parameter study to understand the alteration and give a recommendation. The seismic response of the building is evaluated, and the HRDB alternative systems is confirmed using ETABS. It is pointed out that the HRDBs system can reduce the impact of earthquakes by close to 25% with the smallest section of structural dimension. According to new regulation building in Indonesia, the precise values of test circumstances, such as compressive force, shear displacement, and frequency, are developed. The findings are thoroughly discussed, the applicability of HRDBs for seismic isolation of residential buildings is concluded. Building with HRDBs isolation implied to have lower base shear and inter-storey drift which improved the performance of the structure with less damage.  
Retrofitting Bolted Flange Plate (BFP) Connections Using Haunches and Extended End-Plates Budi Suswanto; Fikri Ghifari; Yuyun Tajunnisa; Data Iranata
Civil Engineering Journal Vol 10, No 8 (2024): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-08-03

Abstract

In Indonesia, one of the most common forms of connection is the Bolted Flange Plate (BFP) moment connection. Nevertheless, their current setups do not satisfy the strict requirements outlined in AISC 358-22. Therefore, this study uses advanced sub-assemblage numerical modeling simulations using ANSYS software to propose a novel way to integrate a half WF extended end-plate connection and trapezoidal haunch in order to fortify BFP moment connections, which does not meet the requirement required by AISC 358-22. Methodologically, the research entails comprehensive modeling and analysis of the proposed retrofit scheme. Six distinct connection models were scrutinized: the BFP-UR representing the existing connection extracted from a structure in Surabaya; the BFP-R4E and BFP-R4ES models, embodying connection retrofits with a half WF extended end-plate; and the BFP-RTR and BFP-RSTR models, embodying connection retrofits with a trapezoidal haunch. Additionally, the BFP-RTRE model integrates both an extended end plate and a trapezoidal haunch in the retrofit scheme. The analytical findings unveil that the proposed strengthening paradigm manifests heightened and superior rotational moment characteristics relative to the pre-reinforcement configuration, albeit encountering stiffness degradation attributable to buckling effects on the main beam. Notably, the analysis indicates that degradation ensues when rotational displacement exceeds 4%, with only the BFP-RTR and BFP-RSTR models exhibiting degradation at a 3% rotation threshold. Crucially, the connections demonstrate the capability to withstand 80% of the beam’s plastic moment under a 4% rotational displacement, thereby aligning with the stringent requisites delineated in AISC 341-22. Doi: 10.28991/CEJ-2024-010-08-03 Full Text: PDF
The Effect of Bar Diameter on Bond Stress of Geopolymer Concrete with Pull-out Test Ashara, Khansa Fadilah; Piscesa, Bambang; Tajunnisa, Yuyun
Journal of Civil Engineering Vol 39, No 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v39i1.17769

Abstract

Geopolymer concrete, an eco-friendly alternative, employs silica, alumina, and alkaline activators. While wet mixing has been extensively studied, its limitations, such as impracticality, quick setting, and low workability, are overcome by the dry mixing method. Study by previous research is limited only to compressive strength, flexural strength, and shrinkage. However, research on bond strength, crucial for concrete-reinforcement adhesion, is limited. This study investigates bond strength through pull-out tests using consistent concrete materials, including Type C fly ash, 12M NaOH, and an alkali ratio of 1:1. Specimens with varying reinforcement diameters (D10, D12, D16) and additional transverse reinforcement (f6-150) were tested. Bond stress averages at D10, D12, and D16 are 25.80 MPa, 25.36 MPa, and 24.25 MPa. Reinforcement diameter directly influences bond strength, with larger diameters yielding greater bond stress.
AN EXPERIMENT OF SHEAR STRENGTH REINFORCED GEOPOLYMER CONCRETE BEAM BASED HIGH-CALCIUM FLY ASH WITH VARIAN SHEAR SPAN-TO-DEPTH RATIO MANSUR, MOH. SAFI'I; Suprobo, Priyo; Tajunnisa, Yuyun; Apsari, Auliagitta Kumala
Journal of Civil Engineering Vol 38, No 3 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v38i3.17494

Abstract

This study discusses geopolymer-reinforced concrete beam's shear strength capacity by experimental observation using high-calcium fly ash as the main binder. This study observed the influence of shear span per effective depth ratio due to the geopolymer concrete beam's shear behavior and strength capacity. Two beams are designed to have diagonal tensile cracks; hence the shear failure state could be obtained. Each beam has similar properties by 150 mm in width, 250 mm in height, 1800 mm in length, 2D16 as the flexure bar reinforcement, and stirrups of Ø6-250 with 20 mm concrete cover. The research employed the four-point load bending testing with the load span difference of each beam, which will later be the study variable. The things sought in this study include the peak load-deflection curve, the shear capacity that occurs in geopolymer concrete beams, and the shear capacity comparison with ACI 318-19. The results of the tests that have been carried out show that type A geopolymer-reinforced concrete beam was more ductile than type B beams, with a percentage difference of about 21.49% in deflection. The shear strength at the ratio a/d of 2 was 115,04 kN, and the ratio a/d of 2.5 was 89,00 kN. As well as a comparison of the shear strength of the test results with calculations according to ACI 318-19 shows a ratio of 1.69. So it can be concluded that ACI 318-19 calculations were conservative.
Analisis Numerik Sambungan Baja Reduced Beam Section pada Sumbu Lemah Kolom Menggunakan Program Bantu ANSYS Diputra, Aditya Tamateja; Suswanto, Budi; Tajunnisa, Yuyun; Masiran, Hidajat Sugihardjo
Jurnal Aplikasi Teknik Sipil Vol 22, No 3 (2024)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2579-891X.v22i3.20643

Abstract

Sambungan struktur baja rangka momen khusus memiliki beberapa persyaratan pendetailan pada sambungannya. Pendetailan perlu dilakukan guna menjaga daktilitas struktur tetap tinggi. Daktilitas tinggi dapat dicapai dengan proses disipasi energi pada balok dengan kata lain sambungan harus tetap pada kondisi elastis saat balok mencapai kegagalan. Salah satu cara memastikan disipasi energi terjadi balok adalah dengan sistem sambungan reduced beam section (RBS). Studi ini memverifikasi model sambungan RBS pada sumbu lemah kolom baja dari benda uji WEAK-DB600-SW dari eksperimen Lee dkk.  dengan aplikasi ANSYS. Permodelan WEAK-DB600-SW menghasilkan sudut rotasi 4% tanpa mengalami kegagalan. Momen yang dicapai saat rotasi 4% sebesar 1178,60 kN-m, lebih besar daripada kapasitas 0,80 Mpb sebesar 1044,79 kN-m. Sambungan hasil analisis numerik layak digunakan pada rangka momen khusus sesuai dengan peraturan AISC. Hasil normalisasi momen puncak pada muka kolom (M/Mpb) model analitikal mencapai 1,09 dengan perbedaan terhadap eksperimen Lee dkk. sebesar 0,5%.
The Effect of Sulfate Exposure on The Mechanical Properties of Conventional Portland Composite Cement Concrete Masrafat, Hazen; Sutrisno, Wahyuniarsih; Tajunnisa, Yuyun
Journal of Civil Engineering Vol 39, No 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v39i2.19030

Abstract

The durability of concrete is an essential factor in construction as a means to enhance the quality of public facilities planning. The durability of concrete structures can be degraded due to several factors, one of the factors is sulfate attack concrete. Expose to magnesium sulfate (MgSO4) causes more aggressive damage compared to sodium sulfate. The negative effect of sulfate exposure is the accelerated formation of microcracks that lead to concrete deterioration. This study aims to investigate the influence of expose to a 5% magnesium sulfate solution on the mechanical properties of Portland composite cement concrete (PCC). Sulfate exposure was conducted after the PCC concrete was cured in water for 28 days. Observations and testing were carried out in four stages: before exposure, after 28, 56, and 90 days. The compressive strength of the concrete increased by 8.78% after 56 days of exposure but decreased by 7.2% from the 56-day strength during the 90-day exposure. The modulus of elasticity, Poisson's ratio, tensile strength, and fracture energy were directly proportional to the compressive strength values generated during sulfate exposure. Additionally, the mass of the concrete increased by 0.87% after 56 days of exposure and then decreased to 0.56% during the 90-day exposure.
FABAKO: Program Pemanfaatan Limbah Fly Ash dan Bottom Ash (FABA) sebagai Paving Jalan untuk Meningkatkan UMKM Masyarakat Paiton Tajunnisa, Yuyun; Cahyani, Arwinda Aribah; Masrafat, Hazen; Hariyanto, Ifarrel Rachmanda; Wibowo, Yosi Noviari; Alfayet, Muhamad Rifki; Halisah, Vonny Nur
Sewagati Vol 8 No 5 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i5.2186

Abstract

Desa Sumberrejo menghadapi dua permasalahan utama yakni, akses jalan yang buruk dan dampak limbah dari PLTU Paiton. Akses jalan yang tidak layak memerlukan renovasi, sementara limbah Fly Ash dan Bottom Ash (FABA) dari PLTU menyebabkan masalah lingkungan dan kesehatan. PLTU Paiton menghasilkan 75% fly ash dan 25% bottom ash dari pembakaran 250 ton batu bara per jam, yang berdampak pada kerusakan hasil panen serta berpotensi menimbulkan masalah kesehatan. Meskipun demikian, uji karakteristik FABA menunjukkan bahwa limbah ini termasuk dalam kategori Limbah Non B3 Terdaftar dan aman digunakan sebagai pengganti semen dalam pembuatan paving block. Penggunaan FABA dalam paving block dapat meningkatkan kekuatan, mengurangi konsumsi air, dan berdampak positif bagi lingkungan. Rencana optimalisasi pemanfaatan FABA mencakup sosialisasi dan pendampingan kepada masyarakat Desa Sumberrejo untuk mengolah limbah menjadi paving block. Inisiatif ini dapat memberikan pengetahuan untuk mengatasi masalah akses jalan, meminimalisasi dampak FABA, dan meningkatkan perekonomian desa. Studi lebih lanjut diperlukan untuk memahami karakteristik FABA, terutama terkait konduktivitas panas sinar matahari. Dengan upaya ini, Badan Usaha Milik Desa Sumberrejo (BUMDes) dapat memanfaatkan limbah PLTU secara berkelanjutan, meningkatkan produktivitas, dan menjaga lingkungan serta kesehatan masyarakat.
Co-Authors Affandhie, R. Buyung Anugrah Affandhie, R. Buyung Anugraha Affandhie, Raden Buyung Anugraha Ahmad Basshofi Habieb Ahmad Basshofi Habieb Alam, Rizki Robbi Rahman Alfayet, Muhamad Rifki Aniendhita Rizki Amalia Apsari, Auliagitta K. Apsari, Auliagitta Kumala Arrafid, Rifqi Nadhif Arwinda Aribah Cahyani Ashara, Khansa Fadilah Auliagitta Kumala Apsari Bambang Piscesa Basshofi Habieb, Ahmad Bayuaji, Ridho Beta Rahayuning Pratiwi Budi Suswanto Budi Suswanto Budi Suswanto Butje Alfonsius Louk Fanggi Cahyani, Arwinda Aribah Chadaffi, Muchamad Daffa Azmi, Ahmad Darmawan, Muhammad Sigit Data Iranata Data Iranata Dicky Imam Wahyudi Dicky Imam Wahyudi Dicky Imam Wahyudi Diputra, Aditya Tamateja Djoko Sulistiono Fadilah Ashara, Khansa Fikri Ghifari Fikri Ghifari Geralda Nurry Arifa Habibillah Asyari, Yudhistira Halisah, Vonny Nur Hariyanto, Ifarrel Rachmanda Hazen Masrafat Hendro Nurhadi Husin, Nur Achmad Ibnu Pudji Rahardjo Ibnu Pudji Rahardjo Ibnu Pudji Raharjo Indra Komara Indra Komara, Indra Jonatan Lassa Jonatan Lassa Jusuf Wilson Meynerd Rafael Jusuf Wilson Meynerd Rafael Khoiri, Mohamad Kuntjoro Kusbiantoro, Andri Louk Fanggi, Butje Alfonsius M. Faishal Darmawan Machsus Machsus Mansur, Moh Safii MANSUR, MOH. SAFI'I Mansur, Moh. Safi’i Masiran, Hidajat Sugihardjo Mawardi, Amalia Firdaus Meynerd Rafael, Jusuf Wilson Mitsuhiro Shigeishi Mochammad Ahdian Wildan Nafi Mohamad Khoiri Muhammad Hafiizh Imaaduddiin Muhammad Sigit Darmawan Muhammad Sigit Darmawan Muhammad Wildan Aziz Nur Achmad Husin Nur Achmad Husin Nur Achmad Husin Nurhadi, Hendro Paramitha, Kharisma Keysia Piscesa, Bambang Priyo Suprobo Priyo Suprobo Purnamasari, Ragil R. Buyung Anugraha Affandhie R. Buyung Anugraha Affandhie Raden Buyung Darmawan Rahardjo, Ibnu Pudji Ralindra, Deris Faisa Ramadhaniawan, Virdy Ridho Bayuaji Ridho Bayuaji Rijiyawanto, Adetya Shigeishi, Mitsuhiro Sigit Darmawan Sigit Darmawan Sita Auliyah Rahmasari Siti Kamilia Aziz Srie Subekti Subekti, Srie Sulchan Arifin Sulchan Arifin Sungkono Karsidi Sungkono Karsidi Sungkono Sungkono Sungkono Sungkono Suprobo, Priyo Suswanto, Budi Sutrisno, Wahyuniarsih Sutrisno, Wahyuniarsih Suwandi Suwandi Suwandi Suwandi Suwandi Syifaul Ummah, Galih Tatas, Tatas Tatas, Tatas Wibowo, Yosi Noviari Wibowo, Yosi Noviari Wilujeng, Susi A Yanisfa Septiarsilia Yosi Noviari Wibowo Yudoprasetyo, Kohar Zanah, Miftaqul