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Unveiling Differences in Seismic Response: Comparative Study of Equivalent Linear and Nonlinear Analyses in the Central Coastal Region of Bengkulu, Indonesia Anggraini, Giovanny Dhebby; Mase, Lindung Zalbuin; Supriani, Fepy; Misliniyati, Rena; Amri, Khairul; Chaiyaput, Salisa
Journal of the Civil Engineering Forum Vol. 11 No. 1 (January 2025)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.13849

Seismic response analysis is a key aspect in earthquake geotechnical engineering, as it provides important insights into the behavior of soils when exposedtoseismic forces. This research compares equivalent linear and non-linear models in the central coastal region of Bengkulu, which is known for its complex geology and high seismicity. By evaluating the accuracy and reliability of each model in predicting ground motion amplification, this research aims to provide useful recommendations for seismic design. The research method uses one-dimensional equivalent linear and nonlinear propagation modeling, namely Pressure Dependent Hyperbolic (PDH). The analysis resulted in the parameters of Peak Ground Acceleration (PGA), time history acceleration, spectral response acceleration, and amplification factor. The equivalent linear method consistently produced higher values for peak ground acceleration (PGA), spectral response acceleration, time history acceleration, and amplification factor compared to the nonlinear method. The analysis results show that the equivalent linear PGA values are in the range of 0.32g to 0.63g, while the nonlinear values range from 0.20g to 0.52g. The resulting spectral responses are averaged over the design spectrum within 0.2 s to 0.9 s, which can affect low- to high-ceilinged buildings. The equivalent linear amplification factor has a range of 1.59 to 1.91, while the nonlinear has a range of 0.80 to 1.59. Both methods have their advantages, with the nonlinear approach offering greater accuracy for large seismic events, while the equivalent linear model remains useful for preliminary analysis. Hopefully, these findings will improve the understanding of ground response in coastal areas and provide valuable data for improving infrastructure resilience in earthquake-prone areas around the world.

Spatial Distribution Analysis of Geotechnical Properties (Elastic Modulus, Cohesion, and Internal Friction Angle) in Soil Layers of Bengkulu City Hanipa, Rerisa Al; Kamal, Thomas Mustafa; Fikri, Muhammad Haikal; Mase, Lindung Zalbuin; Misliniyati, Rena; Supriani, Fepy; Refrizon, Refrizon
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.v21i1.78611

This study investigates the spatial distribution of key geotechnical parameters—namely modulus of elasticity, cohesion, and internal friction angle—in the dominant soil types of Bengkulu City, Indonesia. Given the region’s complex geological structure and vulnerability to seismic activity, accurate assessment of soil characteristics is essential to support infrastructure development and mitigate geotechnical risks. Bengkulu lies between two active tectonic faults, making soil behavior analysis a crucial component of earthquake-resistant design. A total of 215 geotechnical data points were compiled from previous field investigations, covering a wide range of lithologies, including sandy soils, clay deposits, and various rock layers. The geotechnical parameters were spatially interpolated using the Inverse Distance Weighting (IDW) method to generate distribution maps that visualize the variation across different soil layers. This method was selected for its simplicity, effectiveness, and ability to provide weighted estimates based on spatial proximity. The analysis reveals that soils in the southern coastal region generally exhibit lower values of modulus of elasticity and cohesion, indicating a higher potential for deformation and shear failure. In contrast, central and northern areas tend to show higher geotechnical strength parameters, suggesting relatively stable ground conditions. The internal friction angle also increases with depth and material density, with hard rock zones showing the highest values. These findings contribute to the understanding of soil behavior in Bengkulu City and offer valuable insights for geotechnical engineers, urban planners, and disaster mitigation authorities. The spatial analysis of soil strength parameters provides a foundation for more resilient infrastructure planning and can be used as a reference for similar studies in other high-risk seismic regions.

Karakteristik Tanah pada Kawasan Sawah Lebar Baru Kota Bengkulu dan Aplikasinya dalam Perancangan Geoteknik Rifqi, Fianco Fakhri; Mase, Lindung Zalbuin; Supriani, Fepy; Misliniyati , Rena; Hardiansyah
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 14 No. 1 (2025): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35139/cantilever.v14i1.416

Soil is an essential and indispensable material in civil engineering and building design, affecting various construction works. The primary function of soil is to support the construction load built on it, so the soil must be able to carry the load. Each type of soil has different characteristics, so it requires special handling, both physically and mechanically. This research aims to determine the soil's physical and mechanical properties and its application using the finite element method in the Sawah Lebar Baru area, Bengkulu City. The Sawah Lebar Baru area is currently developing a new residential area. Based on the tests conducted, the soil in the area is classified as silt with high plasticity (MH). The tests include physical tests such as moisture content, volume weight, specific gravity, grain size analysis, and Atterberg limits, as well as mechanical tests such as free compressive strength test, consolidation test, and direct shear test. The results of this study provide information on the type, characteristics, physical and mechanical properties of soil, as well as its application in geotechnical design. The foundation design test results showed that the maximum vertical load was 32,900 kN/m², and the safety factor value was 3.047 for the 0.5 m depth variation. The maximum vertical load value in the foundation with a depth variation of 0.75 m is 67,500 kN/m², and the most significant safety factor value is 5.909. For the depth variation of 1 m, the maximum vertical load value is 118,050 kN/m², and the safe factor value is 9.864.

COMPARATIVE ANALYSIS OF PLASTERING WORK EXECUTION TIME ON LABOUR PRODUCTIVITY WITH WORK SAMPLING METHOD Susanti, Dwi Dzulma; Supriani, Fepy; Misliniyati, Rena; Mase, Lindung Zalbuin; Hardiansyah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.54314

Labor productivity is the main parameter in the success of a construction job. This study aims to analyze the level of productivity and the level of Labor Utilization Rate (LUR) in plastering work using the work sampling method, and the most effective time correlation between morning and afternoon. This research was conducted by direct observation for 3 days. The results showed that the highest productivity value was 14.30 m²/hour in the afternoon, and the lowest productivity value was 6.86 m²/hour in the morning. The Labor Utilization Rate (LUR) values in the morning and afternoon were 57.9% and 65.9%, indicating that the afternoon time was more effective than the morning time. However, there was a significant difference in productivity between morning and afternoon time overall, and it can still be categorized as effective with a Labor Utilization Rate (LUR) value of 61.9%, which exceeds 50%.

Characteristics of Cohesive Soil Tanjung Jaya area of Bengkulu City and Its Implementation in Geotechnical Design Junasiq, M. Afra; Misliniyati, Rena; Mase, Lindung Zalbuin; Hardiansyah, Hardiansyah; Supriani, Fepy
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 1 (2025): Volume 15 Nomor 1, Maret 2025
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i1.1214

Abstrak Pembangunan konstruksi di Indonesia terus meningkat seiring dengan meningkatnya kebutuhan infrastruktur. Kota Bengkulu, ibukota Provinsi Bengkulu, juga mengalami pembangunan infrastruktur yang signifikan dalam beberapa tahun terakhir. Penelitian ini bertujuan untuk mengidentifikasi karakteristik tanah kohesif di kawasan Tanjung Jaya, Kota Bengkulu, dan penerapannya dalam mendesain fondasi dangkal. Tahap awal penelitian ini meliputi pengambilan sampel, kemudian dilanjutkan dengan pengujian sifat-sifat fisis tanah, seperti kadar air, berat volume, berat jenis, analisa ukuran butiran, dan Atterberg Limits. Dari hasil pengujian tersebut, tanah di lokasi tersebut diklasifikasikan sebagai lanau elastis (MH). Pengujian sifat mekanis dilakukan melalui uji kuat tekan bebas dan konsolidasi. Pemodelan fondasi berdasarkan sifat fisis dan mekanis tanah, dilakukan dengan menggunakan aplikasi berbasis metode elemen hingga pada satu titik sampel, dengan menggunakan nilai terendah dari kuat tekan bebas (qu) dan kuat geser (Su) dari dua titik uji pada kedalaman 0,75 m dan 1 m, serta variasi lebar fondasi untuk pendekatan yang lebih konservatif. Faktor keamanan terkecil yang diperoleh adalah 1,440, dan terbesar adalah 4,654, dengan beban vertikal maksimum mencapai 109,30 kN/m² pada kedalaman 1 m dan lebar fondasi 2 m.Kata kunci: Tanah kohesif, sifat fisis, sifat mekanis, metode elemen hingga, fondasi dangkal Abstract Construction development in Indonesia continues to increase in line with the growing demand for infrastructure. The City of Bengkulu, the capital of Bengkulu Province, has also seen significant infrastructure development in recent years. This study aims to identify the characteristics of cohesive soil in the Tanjung Jaya area, Bengkulu City, and its application in designing shallow footing. The initial phase of the study includes sample collection, followed by tests of the soil's physical properties, such as moisture content, volume weight, specific gravity, grain size analysis, and Atterberg Limits. The results classify the soil in this location as elastic silt (MH). Mechanical properties testing was assessed through unconfined compressive strength and consolidation tests. Foundation modeling, based on the soil's physical and mechanical properties, was conducted using a finite element method-based application at one sample point, utilizing the lowest values of unconfined compressive strength (qu) and shear strength (Su) from the two test points at depths of 0.75 m and 1 m, as well as Foundation width variations, for a more conservative approach. The most minor safety factor obtained was 1.440, and the largest was 4.654, with the maximum vertical load reaching 109.30 kN/m² at a depth of 1 m and a foundation width of 2 m. Keywords: Cohesive soil, physical properties, mechanical properties, element method, shallow footing

The Effect of Cross-Sectional Shape of Pile Foundation on the Bearing Capacity and Settlement for the Kobema Bengkulu SPAM Filter Building Ibtisamah, Athiyyah Meisu; Misliniyati, Rena; Amri, Khairul; Fikri, Muharram Nur; Supriani, Fepy
Rekayasa Sipil Vol. 19 No. 3 (2025): Rekayasa Sipil Vol. 19 No. 3
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.2025.019.03.13

This study aims to investigate the impact of dimensional variations on the bearing capacity and settlement of filter buildings in the Benteng Kobema Bengkulu Regional Drinking Water Supply System (SPAM), which has a capacity of 380 L/second and plays a crucial role in providing clean water to the community. Given the potential risk of the Mentawai Pagai Megathrust subduction earthquake, it is necessary to evaluate the bearing capacity and settlement of building foundations. Based on the results of the Standard Penetration Test (SPT), the effect of variations on bearing capacity and settlement can be determined using two types of pile cross-sections, namely square and circular, accompanied by differences in pile cross-section dimensions, namely 300 mm, 400 mm, 500 mm, and depths of 7 m, 9 m, 11 m, and 13 m. The comparison is based on the bearing capacity of the foundation and the settlement of the pile foundation for the filter building of the SPAM Kobema Bengkulu project, using several methods: Poulos and Davis, Reese and Wright, Luciano Decourt, and the Finite Element Method. The smallest settlement is obtained by comparing the total settlement with the allowable settlement, which is 10% of the diameter. The test results show that the bearing capacity, deflection magnitude, and smallest settlement are below the permissible settlement limit, which is less than 10% of the foundation dimensions. The comparison between the static and numerical methods, or the Bearing Capacity Ratio (BCR), is closer to 1, indicating a more efficient and safer approach. In this analysis, a BCR value approaching one was obtained for a square-section foundation with a size of 500 mm, using the Reese and Wright method at a depth of 9 m. This yielded a bearing capacity of 312.04 tons for a single pile and 207.69 tons for a group of piles.

PENGETAHUAN MAHASISWA TEKNIK SIPIL UNIVERSITAS BENGKULU MENGENAI KESEHATAN DAN KESELAMATAN KERJA KONSTRUKSI Edriani, Annisa Fitria; Supriani, Fepy
JURNAL TEKNIK SIPIL Vol 9, No 2 (2020): Volume 9, Nomor 2, November 2020
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v9i2.16366

: Dengan tetap tingginya angka kecelakaan kerja di Indonesia, bahkan seluruh dunia, diperlukan inovasi-inovasi dan pendekatan-pendekatan baru dalam usaha menekan angka kecelakaan kerja sektor konstruksi. Salah satu usaha yang dapat dilakukan adalah dengan memastikan calon pekerja sektor konstruksi, khususnya calon sarjana teknik sipil, memiliki pemahaman yang cukup mengenai K3 sebelum mereka menamatkan pendidikan lalu bekerja di sektor konstruksi. Penelitian ini dilakukan untuk mengetahui tingkat pemahaman mahasiswa tahun pertama mengenai K3 di sektor konstruksi kemudian membandingkannya dengan tingkat pemahaman mahasiswa tahun keempat. Pengambilan data dilakukan melalui penyebaran kuisioner kepada dua kelompok sampel tersebut. Kuisioner dikembangkan dalam bentuk penilaian diri (self-assessment). Hasil penelitian menunjukkan sebanyak 23.1% responden dari mahasiswa tahun pertama menjawab sangat buruk ketika ditanyakan apakah Anda mengetahui mengenai K3 konstruksi. Nilai tersebut menjadi 0% ketika pertanyaan yang sama ditanyakan kepada mahasiswa tahun keempat. Menanggapi pertanyaan bagaimana sikap Anda terhadap K3 konstruksi? sebanyak 35.9% (mayoritas) responden merespon dengan skor 3 (biasa). Mayoritas responden mahasiswa tahun keempat memberikan skor 4 atau sangat baik (46.5%). Mayoritas tingkat pengetahuan mahasiswa tahun pertama mengenai aturan (undang-undang, peraturan menteri, dll) K3 konstruksi berada pada tingkat buruk (35.9%) sedangkan mayoritas mahasiswa tahun keempat merasa tingkat pengetahuan mahasiswa tahun pertama mengenai aturan (undang-undang, peraturan menteri, dll) K3 konstruksi mereka baik (44.2%). Mahasiswa tahun keempat diberikan beberapa pertanyaan tambahan. Sebanyak 41.9% responden memberikan penilaian baik dan sebanyak 44.2% responden memberikan penilaian sangat baik terhadap pertanyaan bagaimana kualitas pengajaran mengenai K3 oleh dosen di Prodi Teknik Sipil Universitas Bengkulu?. Penulis menanyakan tingkat penekanan pentingnya K3 oleh dosen di Prodi Teknik Sipil Universitas Bengkulu dan hasil yang diberikan serupa dengan pertanyaan sebelumnya (mayoritas baik dan sangat baik).

STUDI RESISTENSI TANAH BERDASARKAN VARIASI KEDALAMAN KECEPATAN GELOMBANG GESER (Vs) DI KECAMATAN SELEBAR, KOTA BENGKULU Setiawan, Dedi; Mase, Lindung Zalbuin; Supriani, Fepy; Misliniyati, Rena; Amri, Khairul
Jurnal Geosaintek Vol. 11 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i2.3075

Kecamatan Selebar merupakan salah satu kecamatan di Kota Bengkulu yang memiliki beberapa infrastruktur vital. Kondisi geologi yang beragam dan aktivitas seismik yang masif menjadikan kawasan ini sebagai lokasi penting dalam studi geoteknik. Penelitian ini bertujuan untuk mengeksplorasi hubungan antara kecepatan gelombang geser (Vs) terhadap resistensi tanah di Kecamatan Selebar berdasarkan parameter kecepatan gelombang geser rata-rata (Vs) pada kedalaman 10 hingga 50 m (Vs10, Vs20, Vs30, Vs40, dan Vs50), kelas situs dan Ground Amplification Factor (GAF). Penelitian ini menggunakan data sekunder dari perekaman mikrotremor sebanyak 40 titik yang kemudian dianalisis dan divisualisasikan dalam bentuk peta sebaran dua dimensi berbasis Geographic Information System (GIS). Interpolasi spasial dilakukan menggunakan metode Ordinary Kriging dengan Spherical Semivariogram Model dan Inverse Distance Weighting (IDW) untuk memperoleh distribusi sebaran yang lebih akurat. Hasil penelitian menunjukkan bahwa nilai Vs10, Vs20, Vs30, Vs40, dan Vs50 di Kecamatan Selebar berkisar antara 100 hingga 1.100 m/s, dengan peningkatan kekakuan tanah seiring bertambahnya kedalaman. Kecamatan Selebar didominasi oleh kelas situs C, dengan beberapa zona B dan D, serta GAF antara 0.9 hingga 1,7. Penelitian ini diharapkan dapat memberikan gambaran mengenai respons tanah dan dapat menjadi referensi dalam upaya mitigasi serta pertimbangan dalam perencanaan pembangunan infrastruktur tahan gempa di Kecamatan Selebar, Kota Bengkulu.

ANALISIS PENGARUH PENAMPANG FONDASI TERHADAP DAYA DUKUNG DAN PENURUNAN FONDASI TIANG PANCANG BANGUNAN SCADA Jinan, Raihanah Naura; Misliniyati, Rena; Amri, Khairul; Fikri, Muharram Nur; Supriani, Fepy
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.59178

Bengkulu is an area with the potential risk of the Mentawai Pagai Megathrust subduction earthquake; it is necessary to evaluate the bearing capacity and foundation settlement of the building. This study aims to analyse the influence of variations in dimensions and cross-sectional shapes on the bearing capacity and foundation settlement of the Scada building using the Poulos and Davis method, the Reese and Wright method, the Luciano Decourt method, and the finite element method. Based on the results of the Standard Penetration Test (SPT), the influence of variations in shape, namely square and circular, with dimensions of 300 mm, 400 mm, and 500 mm, as well as depths of 7m, 9m, 11m, and 13m, affects the bearing capacity and foundation settlement. The analysis was conducted by comparing the bearing capacity and settlement of pile foundations in the Scada building using various methods. The analysis results show that the bearing capacity, deflection magnitude, and smallest settlement are below the permitted settlement limit, i.e., less than 10% of the foundation dimensions. The comparison between static and numerical methods, or the Bearing Capacity Ratio (BCR) approaching 1, is more efficient and safer to use. In this analysis, the BCR value closest to 1 was obtained for a 500 mm foundation using the Reese and Wright method at a depth of 9 m, yielding a bearing capacity of 312.04 tonnes for a single pile and 207.69 tonnes for a pile group.

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