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All Journal Teknik Sipil dan Arsitektur Teknisia Sumatra Journal of Disaster, Geography and Geography Education SIKLUS: Jurnal Teknik Sipil Jurnal Rekayasa Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia JURNAL SAINTIS TAPAK (Teknologi Aplikasi Konstruksi) : Jurnal Program Studi Teknik Sipil Jurnal Teknik Sipil dan Arsitektur Teknika
Jafar
Universitas Islam Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Assessing Community Vulnerability to the 2010 Merapi Eruption: an Analysis of Exposure, Sensitivity and Adaptive Capacity Jafar
Sumatra Journal of Disaster, Geography and Geography Education Vol. 9 No. 2 (2025): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE) (Decemb
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sjdgge.v9i2.682

Abstract

Mount Merapi is one of the most active volcanoes in Indonesia. In the past century, Merapi erupted several times and caused damage and loss of life to the surrounding communities, especially in Cangkringan Sub-district, Sleman. However, it does not stop the community from inhabiting the volcano’s slopes. One of the main reasons is the communities rely on their livelihood on livestock and agriculture within those areas. This study assessed the vulnerability of the communities who live on the slopes of Merapi by identifying three key aspects: exposure, sensitivity, and adaptive capacity. This study employs a qualitative approach using secondary data from scientific literatures, hazard maps, government reports, and statistical records. Overall, the findings indicate that community vulnerability results from the intersection of persistent exposure, socioeconomic sensitivity, and uneven adaptive capacity. Strengthening disaster risk reduction in Merapi’s hazard zones requires not only enhancing institutional preparedness but also addressing livelihood dependence and local cultural dimensions. The study underscores the importance of integrating social vulnerability assessment into volcanic disaster management and resilience planning.
Perbandingan Performa Lentur Balok Beton Bertulang dengan Sambungan Lewatan dan Mekanis Tipe Clamp Dimas Iman; Jafar Jafar
Teknika Vol. 19 No. 1 (2024): Maret
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/teknika.v19i1.8624

Abstract

Reinforcement bars, or rebar, face length limitations, prompting the need for connection methods in construction. Techniques like overlapping splicing, welding, and mechanical clamping address this. This research investigates flexural performance in reinforced concrete beams, focusing on tensile reinforcement splice methods—overlapping and mechanical clamping with a clamp connection. Key aspects such as flexural moment, deflection, and crack patterns are evaluated through laboratory testing using a two-point loading method. Findings show that beams with overlapping splices outperform those with mechanical clamping, with nominal moments of 33.5 kNm and 32.31 kNm, and deflections of 69.37 mm and 49.02 mm, respectively. Crack patterns in both samples indicate failure at one-third of the beam span due to reinforcement splices at the midpoint, enhancing cross-sectional area. In conclusion, this research underscores the superior performance of overlapping splices in terms of nominal moment and deflection, offering valuable insights for optimizing reinforced concrete element performance in structural engineering.
Perbandingan Kinerja Lentur Balok Beton Bertulang Dengan Sambungan Lewatan Dan Sambungan Mekanis Tipe Cold Forged Sleeve With Parallel Threads Jafar Jafar; Bayu Setya Rahmayuda
Teknika Vol. 20 No. 1 (2025): Maret
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/87cpvk81

Abstract

Steel rebar is generally 12 meters in length, so if more than that is required, it must be joined using methods such as lap splice, welded splice, or mechanical splice. This study compares the flexural strength of reinforced concrete beams without splice, with lap splice, and with Cold Forged sleeve with Parallel Threads (CFSPT) type mechanical splice, to assess the performance of each splice method. The study used beam specimens measuring 200 x 20 x 40 cm with a planned concrete quality f'c 25 MPa. Flexural strength testing resulted in a nominal moment value of 85.209 kNm for the normal beam, 92.952 kNm for the skip beam, and 82.305 kNm for the coupler beam. Based on the nominal moment value of the experiment, the lap splice beam has the highest value and the coupler connection beam has the lowest value. The resulting deflection of the normal beam tends to be higher than that of the lap splice beam and the coupler beam, which is 72.522 mm. While the maximum deflection produced by the lap splice beam and coupler beams is 44.876 mm and 40.191 mm, respectively. The ductility values of the normal beam, lapsplice beam, and coupler beam were 5.949; 3.257; 4.550, respectively.
Co-Authors Bayu Setya Rahmayuda Dimas Iman Fariza Aulia Rahmanto Jain, Shubhanshu Jointina, Dovita M Firzaki Musyaffa Wahyu Nugraha , Rizky Wisnu Erlangga Zaneta Ambarwati