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Pengaruh Model Perletakan Struktur Rangka Baja Sistem Bresing akibat Beban Gempa Bartholomeus, Bartholomeus; Pasaribu, Humisar
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 8 No. 2 (2024)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v8i2.15724

Sistem struktur rangka baja bresing konsentris dan eksentris merupakan sistem struktur konstruksi yang termasuk dalam struktur yang tahan terhadap beban gempa. Pada penelitian ini, masing-masing sistem struktur rangka baja bresing konsentris dan eksentris tersebut dianalisis dengan model perletakan yang berbeda-beda mulai dari struktur dengan perletakan sendi, jepit, dan struktur yang menggunakan base isolator. Model struktur juga divariasikan dengan jumlah tingkat yang berbeda yaitu tingkat 3, 4, dan 5, namun dimensi lebar dan panjangnya dibuat sama. Tahap awal yang dilakukan pada penelitian adalah melakukan preliminary design dan pemodelan struktur. Kemudian dilanjutkan dengan penentuan data gempa riwayat waktu di permukaan. Setelah itu, dilanjutkan dengan penentuan parameter base isolator struktur, dan kemudian melakukan analisis struktur. Hasil analisis struktur menunjukkan kenaikan rata-rata periode struktur rangka bresing konsentris (SRBK) dari perletakan sendi dan jepit masing-masing adalah sebesar 2,20 dan 2,32 kali jika menggunakan perletakan base isolator. Sedangkan kenaikan rata-rata periode struktur rangka bresing eksentris (SRBE) dengan perletakan sendi dan jepit masing-masing adalah sebesar 2,07 dan 2,20 kali jika menggunakan perletakan base isolator. Selain itu, penggunaan base isolator pada struktur SRBK dan SRBE dengan jumlah tingkat dan periode struktur yang lebih tinggi akan membuat struktur akan lebih fleksibel dan belum tentu membuat struktur SRBK dan SRBE tahan gempa, namun dapat mengontrol struktur tersebut sehingga terhindar dari periode struktur dalam kondisi resonansi yang berbahaya.

IDENTIFIKASI MASALAH DAN USULAN SOLUSI UNTUK PENINGKATAN KESEJAHTERAAN DESA TOGU DOMU NAULI Pasaribu, Humisar; Bartholomeus; Silalahi, Rohani; Manalu, Indah Sari; Tambunan, Anggie
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.v5i2.3568

Kuliah Praktek dan Pengabdian Masyarakat di Universitas HKBP Nommensen melibatkan mahasiswa dosen, masyarakat, pemerintah daerah, dan universitas itu sendiri, dengan berbagai manfaat bagi setiap komponen. Bagi mahasiswa melatih daya nalar dan pola pikir, meningkatkan pemahaman tentang masalah masyarakat, menambah wawasan dan pengalaman, serta membangun kreativitas, inovasi, dan kepercayaan diri. Masyarakat mendapatkan pengetahuan baru serta bantuan dalam merencanakan dan melaksanakan program pembangunan. Pemerintah daerah diuntungkan dengan percepatan pelaksanaan program pembangunan melalui bantuan tenaga dan pikiran mahasiswa, khususnya dalam bidang ekonomi, pertanian, dan pendidikan. Bagi Universitas HKBP Nommensen memperkuat kerja sama dengan masyarakat dan berbagai instansi, serta meningkatkan visibilitas dan reputasi universitas di mata masyarakat.

PREDIKSI PENURUNAN TIMBUNAN JALAN : STUDI KASUS: PENANGANAN DENGAN PRE-LOADING DI TEBING TINGGI, SUMATERA UTARA Bartholomeus; Humisar Pasaribu
Jurnal Teknik Sipil Vol 18 No 1 (2022): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v18i1.4592

One method of handling soil that can be done to speed up the consolidation process is to add a Pre-Loading embankment on top of the plan embankment. In addition, this handling is also carried out to achieve a reduction by the design load, so that the settlement of embankment after the construction period still meets the required criteria and standards. This study was conducted to obtain a comparison of the prediction of embankment settlement with the empirical method using CPT data and the prediction of settlement using the Asaoka Method. In addition, the results of the consolidation coefficient will also be compared which can be used to determine the right time for Pre-Loading excavation during the construction period. The data used are CPT test data in the field as well as laboratory test data and measurement data for the settlement plate settlement closest to the position of the CPT test. From the analysis carried out, it is obtained that the prediction of decline using the Asaoka method is smaller than the prediction of decline using the empirical method using CPT data. In addition, from the analysis, it was found that at locations HB-04 and SP 70, as well as HB-07 and SP 91, showed laboratory consolidation coefficient values (cv-Lab.) which were close to the consolidation coefficients of the Asaoka Method (cv-Asa.), while in HB -05 and SP 79 and HB-06 and SP 85 show a large difference in values. The average comparison of the cv-Lab. consolidation coefficients and CV-Asa. is 58.5%.

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

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

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.

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

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

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.

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

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.

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