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Purba, Luki Hariando
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NUMERICAL SIMULATION OF RETROFITTING WITH EXPANSION IN SUPPORT REINFORCE CONCRETE BEAM Purba, Luki Hariando; Simanjuntak, Salomo; Supriyadi, Bambang
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 28, No 2 (2023): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v28i2.5370

Abstract

Beam-strengthening innovations need to be developed considering the frequent occurrence of earthquakes in Indonesia to avoid structural failure. One of the innovations in strengthening existing beams is strengthening by expanding the beam support area. This research aims to determine the behavior of strengthening existing beams. The research methods used are theoretical analysis and finite element analysis. Theoretical analysis and FEA show that strengthening the P1 beam can increase the bending and shear moment capacity by more than 50%. FEA analysis shows that retrofitting of the P1 beam increases stiffness by 45%. Strengthening the P1 beam is also able to avoid failure at the beam-column connection.
PRODUKTIVITAS PEKERJA PROYEK KONSTRUKSI DAN FAKTOR YANG MEMPENGARUHI Lumbangaol, Partahi; Saragi, Yetty; Purba, Luki Hariando
JURNAL DARMA AGUNG Vol 32 No 4 (2024): AGUSTUS
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Darma Agung (LPPM_UDA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46930/ojsuda.v32i4.4620

Abstract

Produktivitas merupakan aspek penting dalam keberhasilan suatu proyek konstruksi. Produktivitas yang baik menghasilkan kualitas yang lebih tinggi, waktu yang lebih cepat, biaya yang lebih rendah, dan hasil yang lebih baik secara keseluruhan. Penelitian ini bertujuan untuk mengetahui : (1) besar produktivitas tenaga kerja yang diukur dalam Faktour Utilitas Tenaga Kerja (LUR = labour utility rate), (2) menentukan pengaruh variabel umur, pengalaman kerja, tingkat pendidikan, kesesuaian upah, jumlah tanggungan keluarga, kesehatan pekerja, hubungan antar pekerja, manajerial dan komposisi kelompok kerja, dan (3) mengetahui variable paling dominan yang berpengaruh pada kegiatan konstruksi. Penelitian dilakukan di proyek pembangunan Jembatan Tano Ponggol, Kabupaten Samosir. Metodologi yang digunakan survey kuesioner dan pengamatan terhadap aktifitas 50 orang pekerja pada saat pembangunan salah satu tiang kolom jembatan. Hasil pengamatan mendapatkan rerata LUR 89,35% dengan LUR maksimum yang terukur 92,7%. Keseluruhan variabel yang diamati yaitu umur, pengalaman kerja, tingkat pendidikan, kesesuaian upah, jumlah tanggungan keluarga, kesehatan pekerja, hubungan antar pekerja, manajerial dan komposisi kelompok kerja memiliki pengaruh signifikan terhadap produktifitas pekerja proyek konstruksi dimana variabel “hubungan antar pekerja” menjadi yang paling dominan mempenaruhi produktifitas pekerja pada proyek ini.
PENINGKATAN KESEHATAN DAN KEBERSIHAN SEBAGAI KUNCI KEMAJUAN DESA BUTTU BAYU PANEI RAJA PASCA KEGIATAN PENGABDIAN lumbangaol, Partahi; Purba, Luki Hariando; Pakpahan, Candra J.A; Tumanggor, Brenico; Simorangkir, Adelina Basa Gloria
PROFICIO Vol. 5 No. 2 (2024): PROFICIO : Jurnal Abdimas FKIP UTP
Publisher : FKIP UNIVERSITAS TUNAS PEMBANGUNAN SURAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36728/jpf.v5i2.3559

Abstract

Interaksi antara masyarakat dan mahasiswa di Desa Buttu Bayu Panei Raja telah menghasilkan dampak positif yang signifikan, terutama dalam upaya membersihkan dan merawat lingkungan serta meningkatkan kualitas pendidikan. Melalui kegiatan gotong royong yang dilakukan dengan semangat kolaboratif, masyarakat dan mahasiswa telah menciptakan lingkungan yang bersih dan sehat, serta memperkuat jalinan komunitas yang erat. Kegiatan pengajaran yang dilakukan oleh mahasiswa juga memberikan kontribusi yang berarti dalam meningkatkan kualitas pendidikan di desa tersebut. Dengan disambut antusias oleh anak-anak, para mahasiswa berhasil menciptakan lingkungan belajar yang positif dan ramah. Mata pelajaran yang diajarkan tidak hanya terbatas pada matematika, tetapi juga mencakup berbagai bidang pengetahuan lainnya, termasuk bahasa Inggris yang tidak diajarkan di sekolah dasar setempat. Program pengajaran ini bukan hanya bertujuan untuk memberikan bantuan kepada guru dan meningkatkan minat belajar siswa, tetapi juga untuk menanamkan nilai-nilai seperti kerjasama, kepedulian, dan tanggung jawab sosial dalam diri siswa. Dengan jadwal kegiatan yang cermat dan upaya untuk mendekatkan diri dengan masyarakat, para mahasiswa berharap dapat menciptakan generasi yang lebih terdidik dan siap menghadapi masa depan yang lebih baik, serta berkontribusi pada pengembangan desa mereka.
Banana Stem Fiber Potential as an Alternative Natural Geosynthetic Material for Soil Reinforcement and Protection Bartholomeus, Bartholomeus; Purba, Luki Hariando; S P Manurung, Charles; Sihombing, Wanto Poller
Rekayasa Sipil Vol. 19 No. 1 (2025): Rekayasa Sipil Vol. 19 No. 1
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.2025.019.01.5

Abstract

Geosynthetics for soil reinforcement and protection require tensile strength and the ability to absorb water. Based on previous studies, it was found that banana stem fibers have both of these mechanical properties of geosynthetics. However, these two strong mechanical properties are not enough for geosynthetic applications. Several other mechanical properties are needed. Therefore, geosynthetic samples were made using spun and woven banana stem fiber materials in this study. The spun was made with different diameters, namely 5 mm, 7.5 mm, and 10 mm, and woven like a mat for one direction of tensile force. Then, additional tests were carried out in addition to tensile strength and water absorption, such as tear strength, puncture strength, and permeability based on permittivity. From the test results, only the woven fabric with a 5 mm spun diameter meets all requirements except for its permittivity value, where the average tensile strength, average tear strength, and average puncture strength obtained for elongation <50% are 32.0 kN/m, 628.7 N, and 1915.8 N, respectively. At the same time, the average water absorption for all diameter variations is 408.07% to 441.86%. So banana stem fibers, especially those with a 5 mm spun diameter, have the potential as an alternative natural geosynthetic material for soil reinforcement and protection by considering the spun fiber woven pattern to improve the permittivity.
Studi Kelayakan Struktur Dermaga Meulaboh Aceh Terhadap Beban Layan Pasaribu, Humisar; Bartolomeus, Bartolomeus; Purba, Luki Hariando
Jurnal Ilmiah Rekayasa Sipil Vol 21 No 1 (2024): April 2024
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jirs.v21i1.1330

Abstract

This research aims to conduct a feasibility study on the Meulaboh port dock in Aceh. The port dock is a key infrastructure in supporting shipping and trade activities in the region. With continued economic growth and changing trade patterns, it is important to evaluate the feasibility and need to upgrade the Meulaboh port dock. The port dock feasibility study involves reviewing several analytical aspects, including technical, economic, environmental, and social aspects. However, in this research, the researcher only reviewed the technical aspects. Researchers will evaluate the physical condition and capacity of the pier so that barges can dock safely. The research methodology involved field surveys, secondary data analysis, and interviews with relevant stakeholders. It is hoped that the results of this research can provide clear guidance for decision-making regarding investment and development of the Meulaboh port pier.The research entitled Feasibility Study of the Meulaboh-Aceh Port Pier resulted in the conclusion that the pier can be berthed by barges measuring 270 feet. It is hoped that the results of this research can also be a basis for intelligent decision-making in efforts to improve and develop this important port infrastructure. The results of this research indicate that there has been damage to the jetty pier structure and significant corrosion to the breasting dolphin structure. The deformation due to service loads is very large in the damaged area of the pier jetty structure so it will definitely endanger users. Recommendations for this pier to continue functioning as public infrastructure require repairs.
Experimental and Numerical Study on the Comparative Flexural Behavior of Geopolymer Concrete Beams Based on Metakaolin and Fly Ash Purba, Luki Hariando; Hutagalung, Bartholomeus; Perangin-angin, Siwan
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78027

Abstract

This study investigates the flexural behavior of normal concrete (BN), fly ash-based geopolymer concrete (BGPF), and metakaolin-based geopolymer concrete (BGPM) through both experimental testing and Finite Element Method (FEM) analysis. The objective is to compare the mechanical properties, load-bearing capacities, and post-yield behavior of these materials. The experimental results indicate that normal concrete beams (BN) exhibited the highest performance in terms of cracking load, yield load, and maximum load, demonstrating both high strength and ductility. The fly ash-based geopolymer concrete (BGPF) showed lower strength than BN but still performed significantly better than the metakaolin-based geopolymer concrete (BGPM). BGPF displayed a more brittle behavior post-yield, with a sharp reduction in load-bearing capacity, making it less suitable for structures requiring significant post-yield deformation. The BGPM beams demonstrated the lowest mechanical performance, primarily due to insufficient curing. The metakaolin material was only heated to 200°C due to laboratory limitations, far below the optimal temperature of 700-800°C necessary for full geopolymerization. As a result, the BGPM beams remained brittle and exhibited minimal load-bearing capacity compared to BN and BGPF. FEM analysis, while providing useful insights into the flexural trends, tended to overestimate the load-bearing capacities and deflections across all beam types compared to experimental results. In conclusion, geopolymer concrete, particularly fly ash-based, shows promise as an alternative to traditional concrete, though its mechanical properties, especially ductility and post-yield behavior, require further optimization. The study highlights the importance of proper curing processes, especially for metakaolin-based geopolymer concrete, to fully realize its potential as a sustainable building material. Future research should focus on refining these processes to enhance the strength and flexibility of geopolymer concrete.
The Behavior of Reinforced Concrete Beams with Various Carbon Fiber Retrofitting Methods in Enhancing Stiffness Zai, Eben Oktavianus; Purba, Luki Hariando
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78313

Abstract

This study investigates the effectiveness of Carbon Fiber Reinforced Polymer (CFRP) sheets and rods in improving the structural performance of reinforced concrete beams. Three beam specimens were tested: a control beam (BN), a beam reinforced with CFRP rods (BTC), and a beam reinforced with CFRP sheets (BLC). The experimental evaluation focused on key parameters, including first crack load (Pcrack), yield load (Pyield), maximum load (Pmax), and deflections at critical points. The stiffness of the beams was assessed at both the cracking stage (Kcrack) and the yielding stage (Kyield). The results demonstrate that the beam reinforced with CFRP sheets (BLC) exhibited the highest improvements in stiffness, with an increase of 184.89% in Kcrack and 221.21% in Kyield compared to the control beam (BN). The CFRP rod-reinforced beam (BTC) also showed enhanced performance, but to a lesser extent, with increases of 72.69% in Kcrack and 64.78% in Kyield compared to BN. The data reveals that BLC significantly reduces deflection and enhances load-bearing capacity, particularly in resisting initial cracking and yielding. The discussion highlights that CFRP sheets provide superior stiffness improvement compared to CFRP rods, making them more suitable for applications where increased stiffness and reduced deflection are critical. While CFRP rods effectively increase the ultimate load capacity, their impact on stiffness is less pronounced than CFRP sheets. In conclusion, CFRP sheets offer a more effective reinforcement solution for enhancing stiffness and controlling deflection in concrete beams, especially in structures requiring high resistance to cracking and yielding.
EXPERIMENTAL AND NUMERICAL STUDY RETROFITTING BEAM WITH EXPANSION IN THE SUPPORT AREA Purba, Luki Hariando; Lisantono, Ade
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 1 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v30i1.6053

Abstract

Retrofitting is one way to strengthen a building to withstand earthquakes and is often called an earthquake-resistant structure. Retrofitting beams will increase strength, stiffness, and ductility so that the structure is still stable when experiencing large earthquake forces. In addition to experimental methods, numerical methods are also used by researchers in developing a study of the behavior of building structures. Numerical methods using finite element software can examine the behavior of strength, stiffness, and ductility in beams. With this background, the author conducted a study of the retrofitting behavior of beams that were widened in the support area using numerical methods and theoretical analysis. The purpose of this study has been achieved so that a conclusion can be given that retrofitting with widening in the beam support area can increase the beam capacity quite significantly. Based on numerical research, with wide expansion reinforcement in the cross-sectional dimensions, the beam strength is increased by almost 45% and the beam stiffness is increased by 13-40% while ductility does not show a significant difference. These results are also expected to show the same behavior in experimental testing so that it will strengthen this reinforcement method. Experimental and numerical testing will be conducted in this study so that it will maintain the results and it is hoped that they can be accepted and practiced in the world of building construction.
Co-Authors Ade Lisantono, Ade Bambang Supriyadi Bartholomeus Bartolomeus, Bartolomeus Hutagalung, Bartholomeus Lumbangaol, Partahi Pakpahan, Candra J.A Pasaribu, Humisar Perangin-angin, Siwan S P Manurung, Charles Saragi, Yetty Sihombing, Wanto Poller Simanjuntak, Salomo Simorangkir, Adelina Basa Gloria Tumanggor, Brenico Zai, Eben Oktavianus