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All Journal Jurnal Konstruksia Rancang Bangun BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Jurnal Aplikasi Teknik Sipil JUTEKS - Jurnal Teknik Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Borneo Engineering : Jurnal Teknik Sipil Prosiding Seminar Nasional Teknik Sipil UMS Jurnal Indonesia Sosial Sains Journal Research of Social Science, Economics, and Management Jurnal Ekonomi, Teknologi dan Bisnis Jurnal Spesialis Teknik Sipil (JSpTS)
Wisnu Isvara, Wisnu
Department of Civil Engineering, Universitas Indonesia
Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences Transportation

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Asesmen Stabilitas Geoteknik dan Rekomendasi Perbaikan Tanah dengan Soil Grouting dan Drainage Tunnels Khoeri, Heri; Isvara, Wisnu; Pradana, Roberto
JUTEKS : Jurnal Teknik Sipil Vol 9 No 1 (2024): JUTEKS (Jurnal Teknik Sipil)
Publisher : P3M- Politeknik Negeri Kupang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32511/juteks.v9i1.1214

Abstract

Terdeteksinya pergeseran dinding penahan tanah pada awal tahun 2023 di salah satu lokasi tower transmisi DD6+12, dikhawatirkan akan mengganggu stabilitas tower yang dapat mengakibatkan kegagalan struktur tower. Asesmen dilakukan secara komprehensif terhadap verticality tower, pergeseran dinding penahan tanah, kondisi di bawah permukaan tanah, dan sifat-sifat tanah di sekitar area tower. Hasil asesmen menunjukkan adanya kemiringan pada tower transmisi secara linier dari bawah ke puncak, dengan defleksi di puncak ±20 cm ke arah selatan dan ±7 cm ke barat. Dengan kondisi ini rasio tegangan tehadap tegangan ijin elemen struktur ada yang mencapai 0.91. Walaupun masih dalam batas ijin, jika stabilitas tanah tidak diperbaiki, dikhwatirman tower akan mengalami kegagalan struktur. Scan GPR menunjukkan adanya perbedaan dimensi pondasi dengan as built drawing dan ditemukan adanya rongga di bawah permukaan tanah yang terisi air karena tidak terdrainasi dengan baik, dimana faktor kemanan dalam kondisi ini 1,088 sementara yang disyaratkan 1,5. Kondisi ini yang menyebabkan terjadinya pergeseran dinding penahan tanah. Rekomendasi pembuatan terowongan drainasi (drainage tunnels) di sisi hulu, soil grouting, pemasangan wheep hole pada dinding penahan tanah dan menambahkan secant pile, akan menaikkan faktor keamanan menjadi 1,988.
Pemeriksaan Kelaikan Fungsi Dengan Uji Beban Statik Pada Jembatan Gelagar Komposit Khoeri, Heri; Nugroho, Panji; Isvara, Wisnu
Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 1 Tahun 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v8i1.4969

Abstract

Parameter daya layan yang harus dipenuhi untuk aspek keamanan jembatan adalah tidak terlampauinya batas tegangan dan batas lendutan pada saat operasional termasuk saat kondisi pembebanan maksimum terjadi. Untuk mengetahui perilaku Jembatan Komposit A30 Persimpangan Underpass Bekambit saat beroperasi dilakukanlah uji pembebanan statik. Uji dilakukan dengan beban bertahap sampai dengan 60% beban rencana (UDL) dan selanjutnya beban dihilangkan pula secara bertahap.. Lendutan terukur pada beban 60% UDL yaitu  21.77 mm yang diextrapolasi ke 100% UDL menjadi 36.28 mm masih di bawah batas lendutan sisa terpasang yaitu 72.4 mm menurut spesifikasi jembatan gelagar komposit A30 dan juga masih di bawah batas lendutan ijin maksimum L/800 yaitu 37.5 mm. Sejalan dengan itu penambahan tegangan pada UDL100% yang diekstrapolasi dari tegangan 60%UDL yaitu 73.64 MPa artinya hanya 32 % dari tegangan ijin SM490 230 MPa. Elastisitas material selama pengujian menunjukkan hasil yang linier, dengan lendutan sisa maksimum 1.14 mm masih di bawah lendutan sisa yang diijinkan yaitu 7.5 mm. Sehingga berdasarkan hasil uji beban statik, jembatan dapat dinyatakan laik untuk difungsikan.
Geotechnical Stability Assessment and Soil Improvement Recommendations using Soil Grouting and Drainage Tunnels (Case study: Retaining wall displacement at a transmission tower site) Khoeri, Heri; Pradana, Roberto; Isvara, Wisnu; Irwanto, Rachmad
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 12 No 2 (2024): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (July 2024)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v12i2.8306

Abstract

The detection of a retaining wall displacement in early 2023 at one of the DD6+12 transmission tower sites raised concerns about the tower's stability, potentially leading to structural failure. A comprehensive assessment was conducted on the tower's verticality, retaining wall displacement, subsurface conditions, and soil properties around the tower area. The assessment results revealed a linear inclination of the transmission tower from the base to the top, with a deflection at the top of approximately ±20 cm to the south and ±7 cm to the west. With this condition, some structural elements reached a stress-to-permitted stress ratio of 0.91. Although still within allowable limits, without soil stabilization, it is at risk of structural failure. GPR scan results showed differences in foundation dimensions compared to the as-built drawings and identified cavities filled with water beneath the ground surface due to poor drainage, resulting in a safety factor of 1.088, whereas the required safety factor is 1.5. This condition caused the retaining wall displacement. Recommendations including constructing drainage tunnels upstream, soil grouting, installing wheep holes in the retaining walls, and adding secant piles would increase the safety factor to 1.988.
Formulasi Kuat Tekan Perkerasan Landasan Pacu Dari Sampel Acak Terstruktur Transmisi Permukaan Ultrasonik Khoeri, Heri; Isvara, Wisnu; Nugroho, Panji
Konstruksia Vol 16, No 1 (2024): Jurnal Konstruksia Vol 16 No. 1 Tahun 2024
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.16.1.131-141

Abstract

Landasan pacu (Runway) merupakan salah satu penentu keamanan dan keselamatan operasional bandara, kerusakan perkerasan runway dapat membahayakan operasi penerbangan. Untuk mengetahui daya dukung perkerasan beton bertulang, maka kuat tekan beton menjadi hal penting untuk diperiksa. Uji tekan pada sampel beton inti merupakan cara yang paling akurat untuk menentukan kuat tekan beton, namun waktu yang tersedia untuk pemeriksaan pada runway sangat terbatas, sehingga pengujian tidak merusak (Non destructive test, NDT) dengan uji cepat rambat gelombang ultrasonik (ultrasonic pulse velocity test, UPVT) dan uji palu pantul (Rebound Hammer test, RHT) menjadi alternatif pilihan. Pada landasan pacu pengujian ultrasonik yang memungkinkan adalah dengan metode transmisi langsung (indirect transmission method, ITM) atau metode transmisi permukaan (surface transmission method), yang dalam banyak penelitian menunjukkan nilai akurasi yang lebih rendah dibandingkan dengan direct transmission method (DTM). Penelitian dilakukan dengan sampel acak terstruktur 1245 data RHT di sepanjang runway 3645 m, 45 pengukuran DTM dan 15 uji sampel beton inti. Hasil pengujian menunjukkan ada hubungan kuat antara hasil RHT dengan ITM, ditemukan korelasi rendah antara ITM dengan kuat tekan beton, , dan tidak ada hubungan antara ITM dan .  Namun secara bersama-sama ITM dan RHT menunjukkan korelasi yang kuat dengan fc’, dimana dengan faktor determinasi.
Asesmen Stabilitas Geoteknik dan Rekomendasi Perbaikan Tanah dengan Soil Grouting dan Drainage Tunnels (Studi Kasus: Pergeseran Dinding Penahan Tanah Pondasi Tower Transmisi) Khoeri, Heri; Isvara, Wisnu; Pradana, Roberto
Jurnal Spesialis Teknik Sipil (JSpTS) Vol 5 No 2 (2024)
Publisher : Magister Teknik Sipil, Fakultas Teknik, Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30996/jspts.v5i2.12067

Abstract

The detection of a retaining wall displacement in early 2023 at one of the DD6+12 transmission tower sites raised concerns about the tower's stability, potentially leading to structural failure. A comprehensive assessment was conducted on the tower's verticality, retaining wall displacement, subsurface conditions, and soil properties around the tower area. The assessment results revealed a linear inclination of the transmission tower from the base to the top, with a deflection at the top of approximately ±20 cm to the south and ±7 cm to the west. With this condition, some structural elements reached a stress-to-permitted stress ratio of 0.91. Although still within allowable limits, without soil stabilization, it is at risk of structural failure. GPR scan results showed differences in foundation dimensions compared to the as-built drawings and identified cavities filled with water beneath the ground surface due to poor drainage, resulting in a safety factor of 1.088, whereas the required safety factor is 1.5. This condition caused the retaining wall displacement. Recommendations including constructing drainage tunnels upstream, soil grouting, installing wheep holes in the retaining walls, and adding secant piles would increase the safety factor to 1.988.
ANALISIS RESIKO GETARAN TANAH AKIBAT PENGEBORAN RENCANA PONDASI JEMBATAN YANG BERSIMPANGAN DENGAN JALUR PIPA GAS Khoeri, Heri; Isvara, Wisnu
Jurnal Teknik Sipil : Rancang Bangun Vol. 10 No. 2 (2024): Oktober 2024
Publisher : Universitas Muhammadiyah Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33506/rb.v10i2.3329

Abstract

Rencana pembangunan perumahan di Desa Cihuni, Kecamatan Pagedangan, Kabupaten Tangerang membutuhkan akses jalan yang melintasi jalur pipa milik PT. Pertamina Gas yang tertanam di bawah tanah. Pelaksanaan konstruksi di atas pipa gas tentunya berpotensi membahayakan keamanan pipa gas. Untuk mengetahui potensi resiko akibat getaran yang diakibatkan oleh pengeboran pondasi pada pipa gas yang tertanam dan mengetahui tindakan pencegahan dan atau perlindungan khusus apabila risiko pada pipa gas berada pada level yang tidak dapat diterima sesuai dengan klasifikasi resiko dilakukanlah penelitian ini. Hasil analisis menunjukkan bahwa penggunanaan mesin bor yang bertenaga 133kW dengan frekuensi putaran 36 rpm berpotensi menimbulkan getaran, PPV sebesar 33.15 mm/det saat mengenai pipa gas, hal ini melampaui kriteria maksimum yang diijinkan yaitu 30 mm/det, tentunya berpotensi merusak pipa. Sementara hasil analisis menunjukkan getaran akibat pengeboran tidak berpotensi menyebabkan likuifaksi dengan faktor keamanan sebesar 15. Untuk memitigasi hal tersebut alternatif yang dapat dilakukan adalah membatasi kecepatan putaran mesin bor sampai dengan 29.5 rpm atau menurunkan dasar pile cap sedalam 2.6 m, dan memasang accelerometer untuk memonitor besaran getaran dan menurunkan rpm atau menghentikan kegiatan konstruksi saat terindikasi ppv mendekati 30 mm/det.
Evaluation of Risk-Based Communication Management in Design-Build Building PT XYZ Projects to Improve Time Performance Jariski, Muzamil; Isvara, Wisnu; Riantini, Leni Sagita
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 4 No. 5 (2025): JETBIS : Journal of Economics, Technology and Business
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v4i5.182

Abstract

The design-build concept continues to evolve as a delivery method in the global and Indonesian construction markets. This study, conducted at PT XYZ, reveals that all design-build building projects over the past three years (2022–2024) have experienced delays or schedule extensions in execution. One of the main factors contributing to poor time performance in design-build projects is communication-related issues. The objective of this study is to evaluate communication management in design-build projects based on dominant risks. This research was conducted by collecting data through literature review, archival analysis, and expert validation questionnaire surveys. The study identified 4 phases, 12 stages, and 58 activities involving 9 stakeholders, which encompassed 59 communication activities and 40 communication-related risks were identified and further analyzed using statistical methods and subsequently evaluated based on their risk levels in order to plan risk responses in communication management evaluation to enhance time performance in design-build building projects.
Static Load Testing Of PCI-Bridges for Assessing Functional Suitability and Its Comparison with Dynamic Testing Khoeri, Heri; Isvara, Wisnu; Widjajakusuma, Jack; Natasa, Fani; Sofiana, Dini
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5655

Abstract

 To accommodate the rapid development of residential and commercial areas in the Bumi Serpong Damai (BSD) Region, Banten, the construction of the Kadisurung bridge is necessary to integrate road networks. Before being operational to ensure the safety of bridge users, load testing is conducted. Parameters that must be met in the testing include not exceeding the strain and deflection limits during operational conditions, including when maximum loading occurs. To assess the bridge's performance during operation, research was conducted on both sides of the central span (western side bridge, JSB, and eastern side bridge, JST) with static load testing carried out with gradually increasing loads up to 50% UDL (136 tons), followed by gradual load removal. At JSB, the maximum deflection at 100% UDL, estimated from the deflection at 50% UDL, was 39.92 mm, and at JST, it was 31.67 mm, while the allowable deflection was 43.3 mm. Based on the deflection parameters, the relative capacities of JST and JSB are expressed as 108.5% and 136.7% respectively, relative to their allowable capacities. This indicates that the estimated bridge capacity using static load testing parameters is 6%-10% greater than when using parameters from dynamic load testing. Thus, the bridge is deemed suitable for operation.
Development of Strategies to Improve the Accuracy of Cost Estimates in Risk-Based Building Construction Projects Astuti, Agnes Sari Diah; Isvara, Wisnu
Journal Research of Social Science, Economics, and Management Vol. 4 No. 12 (2025): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i12.939

Abstract

The cost planning process is the initial stage of a construction project to plan for implementation costs that allow the project owner to determine economic feasibility and evaluate alternatives to achieve the desired feasibility. Poor planning can result in cost overruns, delays and even project cancellations. The cost planning process must be carried out accurately by considering many risk factors so that it can reduce the occurrence of cost overruns at the end of the project. Systemic risk is one of the factors that is often the main driver of the accuracy of cost estimates, especially during the early stages of project determination (AACE, 2020). The purpose of the study was to determine the most dominant systemic risk factors for the accuracy of cost estimates based on the owner's point of view. The methods used are qualitative and quantitative approaches or combined data from both (Ahnyar, Andriani, & Sukmana, 2020), surveys, expert validation, Risk Analysis using the Probability Impact Matrix and Forum Group Discussion (FGD). Questionnaire surveys were conducted on 34 respondents and processed with SPSS software to analyze the data. 13 systemic risk factors that affect the accuracy of the estimate were identified. The control strategy for the 13 recommended systemic risk factors is to develop operational standards for risk-based estimation, create a unit price database based on the realization price of previous projects, conduct training by involving competent senior estimates, add reserve or contingency factors, and look for alternative materials without reducing benefits and usefulness.
Evaluation of Risk-Based Communication Management in Design-Build Building PT XYZ Projects to Improve Time Performance Jariski, Muzamil; Isvara, Wisnu; Riantini, Leni Sagita
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 4 No. 5 (2025): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v4i5.182

Abstract

The design-build concept continues to evolve as a delivery method in the global and Indonesian construction markets. This study, conducted at PT XYZ, reveals that all design-build building projects over the past three years (2022–2024) have experienced delays or schedule extensions in execution. One of the main factors contributing to poor time performance in design-build projects is communication-related issues. The objective of this study is to evaluate communication management in design-build projects based on dominant risks. This research was conducted by collecting data through literature review, archival analysis, and expert validation questionnaire surveys. The study identified 4 phases, 12 stages, and 58 activities involving 9 stakeholders, which encompassed 59 communication activities and 40 communication-related risks were identified and further analyzed using statistical methods and subsequently evaluated based on their risk levels in order to plan risk responses in communication management evaluation to enhance time performance in design-build building projects.
Co-Authors Andreas Wibowo Astuti, Agnes Sari Diah Azhari Wicaksono, Andri Badaruddin, B Fahmilia, Astuti Heri Khoeri Irwanto, Rachmad Jack Widjajakusuma Jariski, Muzamil Kamilah, Fauziyah Khoeri, Heri Leni Sagita Riantini, Leni Sagita Natasa, Fani Nugroho, Panji Pradana, Roberto Sanjaya, Anggi Sofiana, Dini Yusuf Latief