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All Journal Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan REKAYASA DAN INOVASI TEKNIK SIPIL
Heri Khoeri
Program Studi Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Jakarta
Civil Engineering, Building, Construction & Architecture Environmental Science Transportation

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PEMODELAN BERBASIS UJI NON-DESTRUKTIF DAN SEMI-DESTRUKTIF YANG DIVALIDASI FREKUENSI ALAMI PADA ASESMEN RELIABILITAS PONDASI JIB CRANE Heri Khoeri; Naufal Rafif Rizqullah; Badaruddin Badaruddin; Haryo Koco Buwono
RENOVASI : Rekayasa Dan Inovasi Teknik Sipil Vol 8 No 2 (2023): Oktober
Publisher : Department of Civil Engineering, Faculty of Engineer, Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/renovasi.v8i2.17132

Abstract

To ensure the safety of operating the Jib crane, regular inspections and evaluations need to be conducted, including on the foundation structure system. The allowable load specified by the manufacturer only applies when the crane is positioned relatively flat against its support; thus, if the crane is tilted due to settlement at the support during operation, the allowable load will drastically decrease and may cause an overturning. This study was conducted to assess the reliability of the current foundation system after 10 years operation. The foundation system of the Jib crane under investigation consists of steel pipe piles connected to a pile cap at the top and reinforced with bracing between the pipes. Inspections were carried out using non-destructive and semi-destructive testing to obtain actual dimensions and quality of the structural elements. All test data were compiled to serve as input for structural modeling. To ensure the validity of the model, verification was performed with vibration test results. The determination of the number of points and types of tests affects the validity of the model, where the more numerous and comprehensive the tests, the more accurately the model represents actual conditions. The analysis results of the model produced a natural frequency of 1.48 Hz, while the dynamic load test result was 1.5 Hz, with closely matching frequencies indicating sufficiently valid input data, resulting in dynamic structural responses close to reality. The analysis results of the model indicate that the Jib crane foundation is still reliable with a safety factor of 3.1. However, to slow down the corrosion rate of the steel, protective measures are necessary, including periodic painting of the surface of the steel pipe foundation and its supporting bracing, injection into cracked concrete, and protecting concrete from alkali-silica reaction by applying corrosion-resistant bituminous-based painting.
Uji Beban Statis Dan Dinamis Jembatan Baja Komposit Batang Toru-4 Heri Khoeri; Panji Nugroho
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 Heri Khoeri; Wisnu Isvara
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 Badaruddin Badaruddin Haryo Koco Buwono Naufal Rafif Rizqullah Panji Nugroho Wisnu Isvara