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All Journal Jurnal Pensil : Pendidikan Teknik Sipil Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan
Muhammad Aziz Komarudin
PT. Hesa Laras Cemerlang
Civil Engineering, Building, Construction & Architecture Education Transportation Other

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HIDDEN DRAGLOAD: RISKS POSED BY NEGATIVE SKIN FRICTION TO PILE INTEGRITY IN SOFT SOILS Heri Khoeri; Badaruddin; Muhammad Aziz Komarudin; Naufal Rafif Rizqullah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 15 No. 3 (2026): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v15i3.70959

Abstract

Consolidation of soft soil surrounding pile foundations can generate negative skin friction and dragload that is not represented by the superstructure load. This study presents an integrated field, analytical, and numerical diagnosis of pile vulnerability at an operating industrial facility in Kutai Kartanegara, East Kalimantan, where 3.5 m of fill overlies 3–7 m of peat and soft clay. Sixth-year field observations indicated 0.50–0.80 m of ground settlement. Borehole and laboratory data, one-dimensional consolidation, dragload estimation, pile-length sensitivity from 18 to 28 m, and MIDAS SoilWorks modelling were combined. The estimated dragload was 330.7 kN, or 50.3% of the sustained structural load. Including dragload produced geotechnical utilization ratios of 1.334 and 1.013 for 18 m and 21 m piles. The 22 m pile was the minimum length satisfying the adopted axial geotechnical criterion, with URg = 0.935 and a 68.6 kN margin, but the maximum moment reached 86.86 kNm, or 95.9% of the adopted cracking moment. These results indicate limited geotechnical margin and structural vulnerability, not confirmed pile damage. Continued settlement monitoring and pile-integrity testing are required before intervention decisions.
Evaluasi Getaran Lantai Bangunan Menggunakan Smartphone Sebagai Metode Screening Cepat Heri Khoeri; Muhammad Aziz Komarudin
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 14 No 2 (2026): Jurnal Konstruksi dan Infrastruktur Vol 14 No.2 : October 2026
Publisher : Civil Engineering Department, Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jki.v14i2.12407

Abstract

Floor vibrations can affect user comfort even though they do not always indicate structural capacity impairment. This study evaluated vibrations on the third floor of a four-story shophouse and assessed the use of smartphones as an initial screening method. Measurements were conducted at three locations using an iPhone 11 and the G-Force Meter application with a sampling frequency of 100 Hz. The recording duration of 40–60 seconds was standardized to 30 seconds for analysis. Vibrations were recorded during normal activities, particularly when users were walking in corridors or outdoor stairs. Acceleration data were processed through gravity removal, detrending, FIR band-pass filtering, Fast Fourier Transform, and numerical integration. The analysis results showed a dominant frequency of 14.42–18.64 Hz, RMS acceleration of 0.048–0.094 m/s², estimated peak velocity of 2.992–4.832 mm/s, and estimated peak drift of 0.010–0.025 mm. Based on ISO 10137, all points are above the comfort limits for office buildings, while comparison with Minister of Environment Decree No. 49 of 1996 shows vibration levels within the permissible to uncomfortable range. These results indicate comfort issues but do not guarantee structural safety. Smartphones have the potential to be used as an initial screening tool, while technical decisions require calibrated measurements and further evaluation.
Co-Authors Badaruddin Heri Khoeri Heri Khoeri Naufal Rafif Rizqullah