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All Journal Jurnal Pengabdian kepada Masyarakat Teknika Indonesian Journal of Society Development (IJSD) Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Jurnal Civil Engineering Study Jurnal Pengabdian KOLABORATIF Mitra Jurnal Pengabdian Masyarakat Multidisiplin (MJPMM) Jurnal Teknik Sipil
Adolf Situmorang
Universitas Semarang
Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Public Health Social Sciences Transportation Other

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ANALISIS DAN DESAIN STRUKTUR JEMBATAN BENTANG TUNGGAL DENGAN SISTEM GIRDER PRATEGANG : STUDI KASUS JEMBATAN NGLESES KABUPATEN BOYOLALI suudi Yuliahestikawati; Retno Sri Waryani; Adolf situmorang
Teknika Vol. 21 No. 1 (2026): Maret
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/teknika.v21i1.13541

Abstract

Bridge infrastructure development is a critical component in supporting regional connectivity and economic growth. This study aims to analyze and design a single-span bridge structure with a prestressed girder system at the Ngleses Bridge location, Juwangi District, Boyolali Regency. The methodology includes topographic and geotechnical surveys, hydrological analysis to determine design flood discharge, bridge geometric planning, structural calculations using SNI standards, and complementary structure planning. Hydrological analysis results show a 50-year return period design flood discharge of 129.8 m³/s, with flood water level serving as the basis for determining bridge elevation. Geometric planning produces a 30-meter bridge span with a total width of 7.0 meters adjusted to road classification and traffic volume. Structural analysis includes calculations for deck slabs, prestressed girder beams, abutments, and pile foundations considering dead loads, live loads, and environmental loads according to standard loading specifications. Planning results indicate that the bridge structure can withstand design loads with a maximum moment of 1850 kNm and shear force of 685 kN, with adequate safety factors. The contribution of this research is to provide a comprehensive bridge structural analysis and design methodology and serve as a reference for similar bridge projects in Indonesia.
Sosialisasi Potensi Longsor Di Kecamatan Gunungpati Kota Semarang Sebagai Upaya Peningkatan Kesiapsiagaan Masyarakat Adolf Situmorang; Anik Kustirini; Kusrin Kusrin; Agus Muldiyanto; Kukuh Wisnuaji Widiatmoko
Jurnal Pengabdian KOLABORATIF Vol. 4 No. 2 (2026): July
Publisher : Faculty of Engineering, Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/kolaboratif.v4i2.14390

Abstract

Gunungpati District is characterized by geomorphological conditions dominated by hilly terrain with moderate to steep slopes. These topographic features, combined with the local geological and hydrological conditions, increase the area's susceptibility to landslides. This Community Service Program (PKM) aimed to enhance community knowledge and preparedness regarding potential landslide hazards in Gunungpati District through a community-based awareness and education program. The program employed educational lectures, interactive discussions, and the distribution of educational materials to residents. The activities were held at the village hall and involved 30 participants from several villages in Gunungpati District. The results demonstrated a significant improvement in participants' understanding of the primary causes of landslides, early warning indicators, and appropriate mitigation measures that can be implemented at the community level. The participants' average knowledge score increased by 52%, rising from 33.75% before the program to 85.75% after its completion. These findings indicate that integrating public awareness sessions with interactive discussions, case study presentations, and visual learning media effectively enhances community understanding of landslide hazards and corresponding mitigation strategies. Consequently, this program provides a practical foundation for strengthening community resilience to landslide disasters in Gunungpati District.
ANALISIS PONDASI BOX UNDERPASSS PROYEK JALAN TOL TRANS SUMATERA RUAS SIGLI–BANDA ACEH Adolf Situmorang; Kukuh Wisnuaji Widiatmoko; Kusrin
Jurnal Civil Engineering Study Vol. 6 No. 02 (2026): Jurnal Civil Engineering Study
Publisher : Civil Engineering of Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/ces.v6i02.2023

Abstract

The construction of the Sigli - Banda Aceh Section of the Trans Sumatra Toll Road faces significant geotechnical challenges due to the dominance of soft alluvial soils along the project area. Soil conditions characterized by low cone penetration resistance (qc) values result in limited bearing capacity and potentially large consolidation settlements on the box underpass structure. This study aims to analyze subsoil characteristics, evaluate bearing capacity and settlement behavior, and determine an effective ground improvement method for the box underpass construction at STA 0+112.95. Field investigations were conducted using Cone Penetration Tests (CPT) at three testing locations to obtain geotechnical parameters, including cone resistance (qc), sleeve friction (fs), and friction ratio (Rf). Bearing capacity analysis was performed using the Meyerhof method, while settlement analysis was carried out based on Terzaghi’s consolidation theory. Numerical modeling was conducted using Plaxis 2D with the Soft Soil Model and Mohr–Coulomb Model to simulate staged construction sequences. The results indicate that the subsoil is dominated by very soft to soft clay layers with qc values ranging from 0.3 to 1.1 MPa sampai kedalaman 3,4m. Granular replacement method was able to improve soil bearing capacity; however, it did not satisfy the allowable settlement criteria. The combination of granular replacement and 25×25 cm concrete mini piles with a length of 6 m proved effective in reducing first-year settlement to 1.4 cm with a consolidation degree of 91%. This study demonstrates that an integrated approach combining field investigation and numerical modeling can provide an optimal geotechnical solution for infrastructure construction on soft soil deposits.
Co-Authors AGUS MULDIYANTO Anik Kustirini, Anik Bambang Tutuko Bobby Rio Indriyantho Edy Susilo Hani Purwanti Iin Irawati Istianah Kukuh Wisnuaji Widiatmoko Kukuh Wisnuaji Widiatmoko Kusrin Kusrin Kusrin Masvika, Hendra Mohammad Haidar Ibnu Mas'ud Mudjiastuti Handajani Ngudi Hari Crista Purwanto RA Rieke Aulia Assafira Retno Sri Waryani Saputro, Yayan Adi Siril Alfana suudi Yuliahestikawati Yesina Intan Pratiwi