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All Journal Rekayasa Sipil Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Jurnal Sosial dan Teknologi International Journal Science and Technology (IJST) Journal Serambi Engineering (JSE) Jurnal Online Skripsi Manajemen Rekayasa Konstruksi (JOS-MRK)
Cahyani, Kharisma Nur
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Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Transportation

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Analisis Nilai Tegangan Terhadap Variasi Cekungan pada Pelat Baja Menggunakan Finite Element Method Yoganata, Yehezkiel Septian; Purwitasari, Kartika; Cahyani, Kharisma Nur; Fajarwati, Anisah Nur
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The need for high-rise buildings is increasing as land is limited. Buildings made of steel materials are very good at resisting lateral forces. It is very necessary to analyze the mechanical properties of steel to know that the material can effectively resist the load. Modeling of steel plate material with width of 10 mm, thickness of 1 mm and height of 20 mm. Modeling was done using the Abaqus program with four variations of shell radius 0.01, 0.05, 0.1, and 0.2. Von Mises (tensile) stress results were obtained at the horizontal position of the basin at points A (radius point), B (center), and C (edge). For all modeling variations, the highest stress is at point A and then the stress value decreases to point B and then to point C. The most significant difference in value at each point is obtained for a radius variation of 0.2 with the value of each point A = 2.24059 MPa, B = 1.02566, and C = 0.64195. The steel plate variation with a radius of 0.2 has the largest deformation compared to the other variations. It can be concluded that the steel plate with a radius of 0.2 is more likely to be damaged. In the maximum principal stress value, the 0.2 radius variation also has the largest value compared to other variations.
Analisis Struktur Omah Saka Papat di Blitar Terhadap Risiko Beban Gempa Yoganata, Yehezkiel Septian; Fajarwati, Anisah Nur; Kurniawan, Achendri M.; Rahman, Aulia; Cahyani, Kharisma Nur
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Omah Saka Papat is a traditional Javanese architectural structure. It is characterized by four main wooden pillars (saka guru). These pillars reflect the structure's adaptability to environmental conditions. This includes earthquake risks. This study will analyze the structural strength of Omah Saka Papat under seismic and self-weight loads. The saka guru is a critical element of this analysis. STAAD Pro v8i software and the response spectrum method were used to calculate internal forces and evaluate the capacity of teak wood as the primary material. The findings indicate that the combined compressive stress of 123.34 kg/cm² and shear stress of 0.83 kg/cm² are both below the allowable limits of 150.75 kg/cm² and 20.1 kg/cm², respectively. Structural joints using 12.7 mm diameter bolts satisfy the required strength criteria, with a minimum of four bolts per joint. Omah Saka Papat's structural integrity is proven. It's an earthquake-resistant construction that preserves aesthetic and cultural values. Integrating traditional design principles with modern technology provides a sustainable construction model adaptable to natural disasters. These results will undoubtedly contribute to the development of locally inspired, earthquake-resistant construction technologies suitable for seismic-prone regions.
Web-Based Structural Analysis Tool for Simply Supported Beam Using Python Purwitasari, Kartika; Cahyani, Kharisma Nur; Yoganata, Yehezkiel Septian; Safitri, Mona Shinta; Rahmawan, Fauzi Akbar; Jannah, Miftakhul
Rekayasa Sipil Vol. 19 No. 3 (2025): Rekayasa Sipil Vol. 19 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.03.15

Abstract

Structural analysis is essential in civil engineering to ensure the' safety, stability, and performance of load-bearing elements such as beams. Conventional approaches—such as manual calculations or commercial software—often involve high costs, limited accessibility, or steep learning curves. This study presents a web-based computational tool for analyzing simply supported beams, developed in Python to deliver accurate, real-time results through an interactive interface. The tool utilizes fundamental static equilibrium equations to calculate support reactions, shear forces, and bending moments in the simply supported beam subjected to point and uniformly distributed loads. Python’s numerical and visualization libraries enable the automated generation of shear force and bending moment diagrams, input validation, downloadable CSV outputs, and adjustable parameters. Validation consisted of three stages: comparison with analytical hand calculations, benchmarking against Tekla Structural Designer (Educational License), and a usability survey conducted among 67 participants from academic and professional backgrounds. The tool’s results matched reference calculations, and user feedback highlighted high accuracy, clarity, and educational value. This open-access platform offers an effective solution for educational use. Future development will focus on extending features such as analyzing more complex structures under various loading conditions, performing deflection analysis, and mobile compatibility.
Kajian Biaya Dak Hebel Dengan Perkuatan Besi Siku Rahmawan, Fauzi Akbar; Cahyani, Kharisma Nur
Jurnal Sosial Teknologi Vol. 5 No. 9 (2025): Jurnal Sosial dan Teknologi
Publisher : CV. Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsostech.v5i9.32410

Abstract

Penggunaan material alternatif pada konstruksi rumah tinggal semakin beragam, salah satunya muncul ide di masyarakat menggunakan dak hebel untuk konstruksi plat lantai. Dak hebel dengan perkuatan frame besi siku dijadikan opsi masyarakat yang ingin membangun rumah dengan dana yang lebih hemat dibanding menggunakan material konvensional berbahan beton bertulang. Tujuan dari penelitian ini untuk mengatahui analisa harga satuan pekerjaan pembuatan dak hebel per m2. Metode yang digunakan dengan membuat maket konstruksi dak hebel  ukuran 2x2 meter, menggunakan bata hebel 20 cm x 60 cm x 10 cm , besi siku std 5 x 5 cm finshing cat epoxy anti karat, hingga dilakukan proses instalasi pemasangan seluruh komponen demi memahami proses kerja, waktu, dan biaya seluruh proses produksi  yang timbul selama proses pemasangan. Hasil penelitian ini menunjukan biaya satuan per m2 pada pekerjaan dak hebel ini adalah Rp. 1.012.375 , dengan 64,24% pada komponen biaya material, 25,31% biaya pekerja, 4,94% pada biaya alat dan 5,51%  biaya tidak langsung. Temuan ini menunjukkan bahwa dak hebel dengan perkuatan besi siku dapat menjadi alternatif ekonomis yang layak dengan potensi penghematan biaya hingga 25-30% dibandingkan dengan sistem plat beton konvensional, namun dengan pertimbangan khusus pada aspek kapasitas struktural dan durabilitas jangka panjang.
DEVELOPMENT OF FLY ASH AND STEEL SLAG-BASED GEOPOLYMER CONCRETE TO REDUCE CARBON EMISSIONS IN CONSTRUCTION Yoganata, Yehezkiel Septian; Pratama, Ikhsan Putra; Amalia, Najla Nurrahma; Ihsani, Mohammad Amru Bil; Cahyani, Kharisma Nur; Sari, Nur Laily Lupita
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 2 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v30i2.7136

Abstract

The global construction sector, particularly the production of concrete structures, is a major contributor to carbon dioxide (CO2) emissions. Portland cement alone is responsible for 10% of global emissions. In response to this sustainability issue, this research aims to develop green concrete through the partial substitution of cement using fly ash and fine aggregate with steel slag, based on the similarity of the chemical composition of these industrial wastes to concrete materials. The research focuses on two objectives: producing a concrete mix formula that meets the compressive strength standard of 21 MPa and comparing CO2 emissions level. The experiment was conducted in the laboratory in accordance with SNI 7656:2012, involving the fabrication of 24 cylindrical test specimens with three variations of fly ash substitution (10%, 15%, 20%) and steel slag substitution (20%, 15%, 10%). The 28-day compressive strength test results showed that all variations exceeded the strength of conventional concrete (22.29 MPa). Specifically, Variation II (15% fly ash, 15% steel slag) achieved optimal performance with a compressive strength of 24.91 MPa. In addition to its mechanical advantages, this optimal variation also reduced carbon emissions by 15%. These findings highlight the great potential of utilizing industrial waste in producing strong and environmentally friendly concrete.
Internal Force Analysis on Simple Truss Structure: Evaluation of the Cramer’s Rule Method Rif'atul Khusniah; Cahyani, Kharisma Nur; Yoganata, Yehezkiel Septian
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2408

Abstract

Penelitian ini melakukan analisis gaya internal pada struktur rangka batang sederhana dengan menggunakan metode aturan cramer. Analisis dilakukan melalui pendekatan matematis, di mana model matematis dari struktur rangka batang sederhana disusun dalam bentuk sistem persamaan linear yang didasarkan pada keseimbangan gaya di setiap simpul. Sistem persamaan gaya yang diperoleh kemudian diubah menjadi matriks koefisien dan diselesaikan menggunakan metode aturan cramer untuk menghitung gaya internal pada setiap batang rangka. Selain itu, penelitian ini juga menilai dampak kesalahan numerik dalam proses komputasi. Hasil penelitian mengindikasikan bahwa metode Aturan Cramer efektif untuk struktur kecil, namun sangat peka terhadap kesalahan pembulatan dan koefisien yang mendekati nol, sehingga penggunaan metode numerik sangat penting dalam analisis struktur sipil.
ANALISIS PERBANDINGAN RESPONS STRUKTUR GEDUNG BETON BERTULANG TERHADAP GEMPA PASCA PERUBAHAN BENTUK PENAMPANG KOLOM Bilqis, Najwa Nabila; Cahyani, Kharisma Nur
Jurnal Online Skripsi Manajemen Rekayasa Konstruksi (JOS-MRK) Vol. 7 No. 1 (2026): MARET 2026
Publisher : Jurusan Teknik Sipil Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jos-mrk.v7i1.8764

Abstract

Indonesia merupakan negara yang rawan gempa karena terletak di wilayah cincin api. Kondisi ini menuntut bangunan dirancang dengan struktur yang mampu menahan gaya lateral. Kolom merupakan salah satu elemen struktural utama dalam menahan gaya lateral. Penampang kolom dapat berbentuk persegi panjang, persegi, atau bulat. Penelitian sebelumnya telah membahas performa bentuk kolom, namun sebagian besar terbatas pada evaluasi gaya dalam. Penelitian ini bertujuan membandingkan respons struktur dengan variasi bentuk penampang kolom berdasarkan parameter jumlah ragam, simpangan antar tingkat, dan diagram interaksi kolom menggunakan bantuan perangkat lunak analisis struktur. Ketiga model struktur memiliki dimensi, material, dan pembebanan yang sama, perbedaannya hanya pada bentuk penampang kolom. Hasil jumlah ragam ke-6 menunjukkan bahwa kolom persegi panjang memiliki periode terpendek pada arah X sebesar 0,58 detik dan terpanjang pada arah Y sebesar 0,62 detik. Kolom persegi memiliki periode 0,6 detik pada kedua arah, sedangkan kolom bulat menunjukkan periode 0,6 detik pada arah X dan 0,61 detik pada arah Y. Berdasarkan simpangan antar tingkat, kolom persegi panjang mengalami simpangan terkecil pada arah X sebesar 18,011 mm dan terbesar pada arah Y sebesar 20,519 mm. Kolom persegi menunjukkan simpangan terkecil di kedua arah, yaitu 19,111 mm (X) dan 19,356 mm (Y), sementara kolom bulat memiliki simpangan 19,425 mm (X) dan 19,672 mm (Y), yang semuanya masih di bawah batas izin. Diagram interaksi optimal ditunjukkan oleh kolom persegi panjang dengan Pn 4255,3 kN dan Mn 1546,5 kNm, diikuti kolom persegi (4000 kN; 1427,59 kNm) dan kolom bulat (3629,6 kN; 1316,6 kNm). Dari segi biaya, kolom persegi paling ekonomis sebesar Rp21.389.990.737,16, diikuti kolom persegi panjang Rp21.397.826.950,82 dan kolom bulat Rp21.420.129.799,49. Hasil penelitian menyimpulkan bahwa kolom persegi memberikan respons gempa dan efisiensi biaya terbaik, sementara kolom persegi panjang unggul dalam menahan kombinasi beban aksial dan momen.
Co-Authors Achendri M. Kurniawan Amalia, Najla Nurrahma Anisah Nur Fajarwati Aulia Rahman Ayisya Cindy Harifa Bilqis, Najwa Nabila Ihsani, Mohammad Amru Bil Kartika Purwitasari MIFTAKHUL JANNAH Pratama, Ikhsan Putra Rahmawan, fauzi Akbar Rif'atul Khusniah Safitri, Mona Shinta Sari, Nur Laily Lupita Yehezkiel Septian Yoganata