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All Journal Jurnal Konstruksi Jurnal Konstruksia Prosiding Semnastek AGREGAT Rancang Bangun 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 Spesialis Teknik Sipil (JSpTS) Jurnal Inovasi Teknologi dan Edukasi Teknik Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan JMTSS Clean Energy and Smart Technology Journal of Green Science and Technology PASAK: Jurnal Teknik Sipil dan Bangunan
Heri Khoeri
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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FORMULATION OF CONCRETE COMPRESSIVE STRENGTH BASED ON BUILDING AGE, DENSITY, AND NON-DESTRUCTIVE TESTING WITH ULTRASONIC PULSE VELOCITY TESTS Khoeri, Heri; Wisnu Isvara; Roberto Pradana; Dini Sofiana
Clean Energy and Smart Technology Vol. 2 No. 2 (2024): April
Publisher : Nacreva Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58641/cest.v2i2.85

Abstract

In the assessment of existing reinforced concrete buildings, the compressive strength of concrete, , is a key parameter for performance assessment. The most accurate way to identify it is by conducting compressive strength tests on core concrete samples from structural elements obtained through drilling. The more samples taken, the more accurate the determination of for structural modeling will be. However, sampling in buildings certainly disrupts activities within the building, compounded by drilling marks that leave traces even after repairs. Therefore, sample collection must be selective, yet the results must still provide confidence as input for structural analysis. A method for estimating using the ultrasonic pulse velocity test, UPVT, categorized as a Nondestructive Test, NDT, has long been used and continues to be developed. Various building regulations state that NDT for estimating should be paired with the results of compressive strength tests on core concrete samples to obtain correlation between them. The relationship equation between wave propagation velocity, , and varies between studies, indicating that besides , there are other influencing factors. In this study, samples were taken from 5 (five) buildings of different ages. In addition to , the effects of density, , and age, , were examined. The results of the study indicate that has no effect, while influences the relationship between V and according to the equation with .
Quick Assessment of Bridge Performance Based on Dynamic Parameters Acquired with Smartphone Application Khoeri, Heri; Nugroho, Panji; Pradana, Roberto
Clean Energy and Smart Technology Vol. 2 No. 2 (2024): April
Publisher : Nacreva Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58641/cest.v2i2.86

Abstract

The road management regulation aims to achieve reliable and excellent road services that prioritize the interests of the community by ensuring the functional and competitive performance of the roads, as well as community participation in road management in accordance with Republic of Indonesia Law No. 2 of 2022. As part of the community, when crossing the Tegineneng Bridge on the Tegineneng-Sp. Tanjung Karang road section in Lampung Province and feeling discomfort from the bridge vibrations, participating individuals conducted vibration measurements using 2 smartphones. The gyroscopes in the smartphones, packaged within a g-force application, were capable of recording real-time vibrations in a user-friendly manner, and the output data was compatible with existing modal analysis software. Subsequently, vibration data recordings using the SSI algorithm yielded dynamic parameters such as a natural frequency of 2.009Hz and a damping ratio of 7.927%. The frequency of 2.009Hz for a span of 60m is lower compared to bridges of the same span from the dynamic bridge test regression equation in Indonesia, which is 2.347Hz. Under these conditions, it is estimated that the Tegineneng Bridge experienced minor structural damage with a damage level of 14.1% and its capacity is lower by 28.2% than the empirical estimate. The damping ratio exceeding 5% is estimated to be due to excessive energy dissipation through cracks in the concrete or through defects in the connections between steel frame elements. It is recommended that relevant stakeholders conduct a detailed inspection of the bridge to ensure its safety and undertake necessary measures to guarantee the safety of its users.
Uji Beban Statik dan Dinamik untuk Asesmen Reliabilitas Jembatan Baja Komposit Bentang 20m, 25m dan 30m Khoeri, Heri
Pasak: Jurnal Teknik Sipil dan Bangunan Vol 1 No 2 (2024): Maret
Publisher : Fakultas Teknik dan Ilmu Komputer Universitas Sains Al-Quran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/pasak.v1i2.6957

Abstract

Jembatan adalah salah satu prasarana transportasi vital yang berdampak pada bidang sosial, ekonomi, pertahanan dan keamanan, sehingga aspek keselamatan dan kenyamanan penggunanya harus benar-benar terpenuhi sebagaimana dinyatakan dalam Permen PUPR 10 tahun 2022 tentang Keamanan Jembatan dan Terowongan. Penilaian reliabilitas jembatan dapat diperoleh dari parameter statik pada kondisi layannya dengan tidak terlampauinya batas lendutan dan batas tegangan saat operasional termasuk saat pembebanan maksimum terjadi, juga terpenuhinya kriteria penilaian parameter dinamik yang salah satunya dari frekuensi alami. Untuk mengetahui reliabilitas 3 (tiga) buah jembatan baja komposit pada akses jalan Mukut, Sumatera Selatan, maka dilakukanlah uji beban statik dan dinamik. Dari uji beban dinamik diketahui tingkat kerusakan jembatan 2, 3, dan 4 secara berurutan sebesar 2.1%, 22.4% dan 25%. Dari hasil uji beban baik statik maupun dinamik teridentifikasi kapasitas jembatan 2, 3 dan 5 secara berurutan 95% (61 ton), 54% (43 ton), dan 49% (46 ton) dari rencananya. Karena ketiga jembatan tersebut dalam satu akses jalan, maka total beban yang diijinkan berada diatas jembatan adalah 43 ton. Diperoleh nilai akurasi yang cukup tinggi dari uji beban dinamik untuk penilaian reliabilitas bangunan atas jembatan dimana perbedaannya dengan uji beban statik hanya 0.04%­ + 0.8%. Dengan perbedaan yang sangat kecil mengingat uji beban dinamik memerlukan waktu yang relatif lebih singkat, maka dapat dinyatakan bahwa uji beban dinamik cukup efektif dan efisien untuk menilai reliabilitas struktur bangunan atas jembatan, selama jembatan masih berperilaku linear elastis.
Identification of Traffic-Induced Soil–Structure Resonance in Heritage Buildings and Mitigation using Operational Modal Analysis Khoeri, Heri; Sofiana, Dini
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11702

Abstract

Excessive vibrations in heritage buildings located near heavy traffic often cause occupant discomfort despite adequate structural capacity. This study investigates the vibration mechanism and proposes a mitigation strategy with minimal intervention using Operational Modal Analysis (OMA) and Stochastic Subspace Identification (SSI). The identified fundamental frequency of the building is 3.09 Hz, which closely matches the dominant traffic-induced ground frequency (3.10 Hz), yielding a frequency ratio  ≈ 1.0 and confirming soil–structure resonance as the governing mechanism. This resonance amplifies responses, particularly at intermediate floors. To mitigate the effect, a Multiple Tuned Mass Damper (MTMD) system with a total mass of 4 tons (≈0.54% of structural mass) is proposed. The MTMD effectively reduces dynamic amplification while remaining non-invasive, making it suitable for heritage structures. The results demonstrate that small-mass MTMD provides a practical and efficient vibration mitigation solution.
Evaluasi Kekakuan dan Stabilitas Hauling Road Berdasarkan Modulus Deformasi Tanah Hasil Repetitive Static Plate Load Test: EVALUATION OF HAULING ROAD STIFFNESS AND STABILITY BASED ON SOIL DEFORMATION MODULUS FROM REPETITIVE STATIC PLATE LOAD TEST Khoeri, Heri; Dini Sofiana; Panji Nugroho
Jurnal Teknik Sipil : Rancang Bangun Vol. 12 No. 01 (2026): April 2026
Publisher : Universitas Muhammadiyah Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33506/rb.v12i01.5359

Abstract

Kinerja struktural hauling road ditentukan oleh kekakuan dan stabilitas tanah dasar akibat beban berat berulang. Evaluasi lapangan umumnya dilakukan menggunakan repetitive static plate load test dengan modulus deformasi siklus pembebanan lanjutan sebagai dasar pemenuhan kriteria desain, meskipun pendekatan satu parameter belum sepenuhnya menggambarkan kondisi awal dan evolusi kekakuan tanah dasar. Penelitian ini mengevaluasi kinerja subgrade hauling road menggunakan repetitive static plate load test pada beberapa titik uji yang mewakili berbagai jalur operasional. Analisis difokuskan pada respons pembebanan siklus awal dan lanjutan serta rasio peningkatan kekakuan sebagai indikator stabilisasi tanah. Hasil menunjukkan bahwa sebagian besar titik uji memenuhi modulus minimum desain, namun didominasi oleh rasio peningkatan kekakuan yang tinggi, yang mengindikasikan sensitivitas subgrade terhadap pembebanan awal. Titik yang tidak memenuhi kriteria desain berkorelasi dengan kekakuan awal yang rendah dan dominasi deformasi plastis. Temuan ini menegaskan bahwa evaluasi kinerja subgrade hauling road akan lebih komprehensif apabila pemenuhan kriteria desain dikombinasikan dengan analisis perilaku tanah akibat pembebanan berulang untuk mendukung pengendalian mutu dan strategi perbaikan yang lebih efektif dan berkelanjutan.
PENGARUH BERLAWANAN KONFINEMEN CFRP DENGAN ADANYA CHAMFER DAN REDUKSI LUAS PENAMPANG PADA KOLOM BETON BERTULANG PERSEGI: COUNTERACTING EFFECTS OF CFRP CONFINEMENT AND CHAMFER-INDUCED AREA REDUCTION IN SQUARE REINFORCED CONCRETE COLUMNS Khoeri, Heri; Panji Nugroho
Jurnal Teknik Sipil : Rancang Bangun Vol. 12 No. 01 (2026): April 2026
Publisher : Universitas Muhammadiyah Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33506/rb.v12i01.5405

Abstract

Perkuatan kolom beton bertulang persegi menggunakan Carbon Fiber Reinforced Polymer (CFRP) merupakan metode yang efektif untuk meningkatkan kapasitas struktur eksisting. Pada kolom persegi, aplikasi CFRP full jacket memerlukan pembulatan sudut (chamfer) guna meningkatkan efektivitas konfinemen, namun pembesaran chamfer secara simultan menyebabkan pengurangan luas penampang beton efektif. Penelitian ini mengevaluasi keseimbangan pengaruh antara peningkatan kapasitas akibat konfinemen CFRP dan penurunan kapasitas akibat kehilangan luas penampang pada kolom beton bertulang persegi. Studi dilakukan pada kolom berukuran 400×400 mm dengan pembesian 8D16, sengkang D10-150, mutu beton f’c = 25 MPa, dan baja tulangan fy = 400 MPa, yang diperkuat CFRP dua lapis dengan orientasi serat hoop full jacket. Variasi radius chamfer dianalisis mulai dari r = 20 mm hingga batas maksimum yang ditentukan oleh selimut beton eksisting. Kapasitas kolom dievaluasi menggunakan diagram interaksi aksial–momen (Pn–Mn) dengan mempertimbangkan beton terkekang dan pengurangan luas penampang efektif secara eksplisit. Hasil menunjukkan bahwa peningkatan radius chamfer meningkatkan efektivitas konfinemen CFRP dan kapasitas kolom secara keseluruhan, sementara pengaruh negatif akibat reduksi penampang relatif lebih kecil, meskipun kecenderungan diminishing return terlihat pada radius yang lebih besar.
Rainfall-Induced Shallow Slope Failure and Mechanism-Based Stabilization of Telecommunication Infrastructure Khoeri, Heri; Nugroho, Panji; Rizqullah, Naufal Rafif
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.8315

Abstract

Rainfall-induced shallow slope failure is a recurrent geotechnical hazard in tropical regions, particularly for slopes supporting critical infrastructure. This paper presents a case study of a shallow translational failure at a telecommunication facility in Batam, Indonesia, following prolonged heavy rainfall. The study integrates subsurface investigation (six boreholes with SPT, electrical resistivity surveys, and laboratory testing) to establish engineering stratigraphy consisting of three units: an upper loose to medium silty sand (Unit I), a medium to dense sand (Unit II), and competent sandstone (Unit III). Limit-equilibrium stability analyses were performed under dry and various rainfall infiltration scenarios, with rainfall effects represented by a rising perched water table (PWT). Results show that the slope is highly stable under dry conditions (factor of safety, FS ? 1.996). However, as the PWT rises from 4 m to 1 m below ground surface, the FS progressively decreases from 1.384 to 0.931, indicating that rainfall-induced pore water pressure increase and loss of matric suction are the governing failure mechanisms. Based on this mechanism, a combined mitigation strategy incorporating surface drainage improvement and soldier pile reinforcement was developed. Under the most critical rainfall scenario (PWT at 1 m depth), the reinforced slope achieves an FS of approximately 1.593, exceeding the recommended minimum of 1.5 for strategic infrastructure. The study highlights the necessity of explicitly incorporating rainfall-driven groundwater rise into slope stability assessments for critical facilities in tropical environments and provides a mechanism-based framework for effective stabilization.
Uji Beban Statis Dan Dinamis Jembatan Baja Komposit Batang Toru-4 Khoeri, Heri; Nugroho, Panji
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 13 No 3 (2025): Jurnal Konstruksi dan Infrastruktur Vol 13 No.3 Desember 2025 Special Edition: E
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.v13i3.10749

Abstract

Bridges are vital infrastructure that require feasibility evaluation before being used to ensure user safety. Feasibility assessment can be done through dynamic and static tests. The dynamic parameters used are natural frequency and damping ratio, while static parameters include deflection and strain during loading. This study conducted forced vibration tests and static load tests on the Batang Toru-4 Bridge. The vibration test results showed a natural frequency of 3,248 Hz, lower than the minimum limit of 3,357 Hz according to Bina Marga empirical data, but still above the British Standard, and a damping ratio of 7.636%, indicating an indication of excessive energy dissipation which is generally due to defects in the structure. However, the static test showed a maximum deflection at 100% UDL of 11.9 mm, still far below the permissible limit of 50 mm. The residual deflection ratio was also only 0.044, still below the permissible limit of 0.2. Therefore, with these results, the bridge was declared functionally fit, but it was recommended to conduct further checks to ensure that excessive damping was not caused by structural damage. The calculated relative capacity is approached by a more conservative dynamic load test compared to a static load test, so that the dynamic load test is an alternative test with a relatively faster time, easier and more conservative results compared to the static load test.
Mitigasi Getaran Enclosed High Temperature Flaring System (EHTFS) Berbasis Operational Modal Analysis dan Interaksi Tanah–Struktur Khoeri, Heri; Isvara, Wisnu
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 14 No 1 (2026): Jurnal Konstruksi dan Infrastruktur Vol 14 No.1 : April 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.v14i1.11711

Abstract

Enclosed High Temperature Flaring Systems (EHTFS) are employed to control gas emissions through high-temperature enclosed combustion; however, structural modifications such as flare stack heightening may alter dynamic characteristics and induce environmental vibration problems. This study evaluates vibration responses induced by EHTFS operation and investigates the mechanisms of vibration amplification and resonance affecting surrounding structures. Field measurements were carried out using three-axis accelerometers installed on the flare stack, supporting structures, soil, and nearby residential buildings during flaring events. Structural dynamic properties were identified using Operational Modal Analysis (OMA) based on the Stochastic Subspace Identification (SSI) method, combined with an assessment of soil–structure interaction. The results show dominant vibration frequencies of 6.1–6.2 Hz, where the natural frequencies of the flare stack and nearby houses are closely spaced. Peak acceleration at residential buildings reached 0.149 m/s², approximately twice that at the source (0.074–0.077 m/s²), indicating significant amplification. Soil investigation revealed shear-wave velocities of 168–257 m/s with relative dynamic amplification factors up to 1.0. Although soil–structure interaction influences wave propagation, the observed amplification is primarily attributed to low-frequency resonance between operational excitation and structural natural frequencies. Increasing flare stack stiffness effectively shifts the natural frequency and reduces resonance potential. The proposed integrated OMA–SSI framework provides a reliable basis for vibration mitigation in industrial flaring facilities.
Co-Authors Adeputra, Galuh Andika Setiawan, Andika Badaruddin Badaruddin Badaruddin Badaruddin, B Davit Fikri Deby Puspitaningrum Dini Sofiana Dwi Yulina Abdi Jayanti Faisal Ridho Faisal Ridho, Faisal Galuh Ade Putra Haryo Koco Buwono Jack Widjajakusuma Natasa, Fani Naufal Rafif Rizqullah Nugroho, Panji Panji Nugroho Pradana, Roberto Prof. Ir. Sofia W. Alisjahbana, M.Sc., Ph.D., Prof. Ir. Sofia W. Rizqullah, Naufal R. Rizqullah, Naufal Rafif Rizwan Komarudin Roberto Pradana Satiawan, Budi Sembada, Zerik Sofiana, Dini Tri Setiyono Wisnu Isvara Wisnu Isvara, Wisnu