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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Teras Jurnal Journal of the Civil Engineering Forum LANGKAU BETANG: JURNAL ARSITEKTUR Jurnal Aplikasi Teknik Sipil Jurnal Riset Rekayasa Sipil Journal of the Civil Engineering Forum
Bambang Suhendro
Departemen Teknik Sipil Dan Lingkungan, Universitas Gadjah Mada, Yogyakarta
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Transportation Other

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The Influence of Temperature Variations on Rigid Pavement Concrete Slabs Anno Mahfuda; Suprapto Siswosukarto; Bambang Suhendro
Journal of the Civil Engineering Forum Vol. 9 No. 2 (May 2023)
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.5744

Abstract

This research aims to assess the effect of temperature gradient developed within the concrete slab of rigid pavement, and to investigate its impact when incorporated with the traffic load, and the heat transfer pattern. The rigid pavement model considers an isotropic, uniform, and linear-elastic schemes to simulate the material properties. A numerical analysis approach was employed using Abaqus software incorporated with the 3D Solid model. The traffic loads were obtained from the field surveys, while the temperature of the slabs was measured directly on the site. The dimension of the rigid panel is 2.75 m in width, 5 m long, slab thickness of 25 cm, and concrete specification of 41.33 MPa. The results showed that the temperature gradient produced a significant impact on stress development within the concrete slab of rigid pavement. It was observed that the temperature gradient during the daytime generated higher stress than at night, with a value reaching the MOR (Modulus of Rupture). The exposure of the rigid pavement to 500C tends to produce a principle slab stress of 2.395 MPa, while 1.31 MPa was developed due to the traffic load. When the two factors were combined, the concrete slab acquired a maximum principle stress of 3.322 MPa, which is close to the MOR of 83.34% fa. These results showed that the pavement is capable of withstanding stress from temperature gradient and traffic load as indicated by the ratio of less than one (1). However, this ratio is high for fatigue failure mitigation purposes, and this reduces the quality of life of the rigid pavement.
Analisis Derajat Kerusakan dan Penurunan Modulus Elastisitas Material Cement Treated Base (CTB) menggunakan UPV test dan Concrete Quality Designation (CQD) Ade Trias Safrudin; Suprapto Siswosukarto; Bambang Suhendro
Jurnal Aplikasi Teknik Sipil Vol 21, No 4 (2023)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2579-891X.v21i4.18629

Abstract

Cement-treated base (CTB) is a type of foundation material commonly used in pavement structures which initially has high stiffness, but due to repeated loads CTB tends to experience more cracks which can cause a decrease in its elastic modulus. This study aims to determine the extent of damage and decrease in the value of CTB's elastic modulus before and after cracking through ultrasonic pulse velocity (UPV) test and unconfined compressive strength (UCS) tests on CTB cylinder samples. The CTB material quality index was evaluated using a concrete quality designation (CQD). The results showed that the magnitude of stress applied to  CTB affects the degree of damage, and the degree of damage to CTB significantly affects the material’s modulus of elasticity. The greater the degree of damage to CTB, the smaller the elastic modulus will be. For applied stress with CTB damage level of 32%, the elastic modulus decreases by 33.55%. The level of damage caused by the application of the maximum stress (100%) on CTB sample reached 95.29%, and the modulus of elasticity decreased by 83.30%. The CTB sample with 95.29% degree of damage has the same elastic modulus as the unbound granular aggregate material.
Experimental Study of Cable Force Measurement on Cable-Stayed Bridges Based on Vibration Method Aisyah, Aisyah; Suhendro, Bambang; Aminullah, Akhmad
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 20 No. 2 (2024): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v20i2.67731

Abstract

This study investigates cable force estimation in cable-stayed bridges through a vibration-based approach, utilizing experimental data measured using an accelerometer sensor. In the initial phase of the research, the frequency data measured by accelerometers is validated through numerical modeling using the Midas Civil software. Additionally, besides employing the string formula, this study adopts formulas proposed by [1] to predict cable forces in two cable-stayed bridges in Indonesia. The estimated cable forces using both formulas are then compared with the actual cable forces measured during the lift-off test.The analysis results indicate that most of the cable frequency data is valid, with differences of less than 7% between the measured frequencies and numerical results. However, a significant difference is observed in one cable, BA-M11, with differences of up to 50.9%. This suggests that the mode order and frequency values measured for this cable are not valid. Through a numerical approach, accurate mode orders and frequencies are determined, enabling confident use of the measurement data for cable force estimation in the case of cable BA-M11.Furthermore, when the validated mode orders and frequency values are used with both the string formula and Yu's proposed formulas, the results show that Yu's formulas tend to provide more accurate estimations compared to the string theory, with average differences in cable force estimation of approximately 4.33% and 2.97% relative to the lift-off force.The contribution of this research lies in the utilization of numerical verification to correct inaccuracies in accelerometer-measured mode orders and frequency values. Subsequently, armed with validated mode orders and frequency values, Yu's proposed formulas demonstrate superior accuracy in predicting cable forces compared to the string theory when both are compared with lift-off test data.
PENGARUH PERBEDAAN UKURAN KARET BAN BEKAS TERHADAP SIFAT MEKANIK Nasution, Multilawati; Aminnullah, Akhmad; Suhendro, Bambang
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol 16, No 1 (2020): Mei
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (646.488 KB) | DOI: 10.21831/inersia.v16i1.31314

Abstract

ABSTRAKBan bekas sulit diurai karena salah satu bahan penyusunnya adalah karet sintetis. Ban bekas digunakan untuk kerajinan tangan, namun besar peluang penggunaan ban bekas sebagai material konstruksi. Kajian ini bertujuan untuk membedakan ukuran karet ban bekas berdasarkan lolos saringan no.#4 (4.8 mm) dan lolos saringan no.#8 (2.3mm). Objek kajian ini adalah kuat tekan dan modulus elastisitas dengan benda uji slinder (&15 cm x 30 cm), kuat lentur dengan benda uji balok (10 cm x 10 cm x 50 cm),  serta kuat tarik dengan benda uji dogbone. Salah satu penyusun mortar adalah karet ban bekas pengganti sebagian dari volume pasir. Kadar karet yang di ambil dari kajian ini adalah 0%, 20%, 40% dan 60%. Kajian ini tidak didapatkan perbedaan yang signifikansi yang besar antara penggunaan karet ban bekas lolos saringan no.#4 (4.8 mm) dan lolos saringan no.#8 (2.3mm).Kata kunci: ban bekas, kuat tarik, kuat tekan, kuat lentur, modulus elastisitasABSTRACTUsed tires are difficult to decompose because one of the constituent materials is synthetic rubber. Used tires are used for handicrafts, but there is a big chance of using used tires as construction materials. This study aims to differentiate the size of used rubber tires based on sieve No. 4 (4.8 mm) and sieve # 8 (2.3mm). The object of this research is compressive strength and modulus of elasticity with slinder test specimens (15 cm x 30 cm), flexural strength with beam test specimens (10 cm x 10 cm x 50 cm), and tensile strength with dogbone specimens. One of the compilers of the mortar is a used tire rubber which partially replaces the volume of sand. The rubber content taken from this study is 0%, 20%, 40% and 60%. There was no significant difference between this study between the use of used rubber tires that passed filter No. #4 (4.8 mm) and passed filter # 8 (2.3 mm).Keywords: used tires, tensile strength, compressive strength, flexural strength, modulus of elasticity
Analisis Modal Operasional (OMA) pada Jembatan Concrete Box Girder Bentang 50 Meter dengan Perbandingan Metode Fast Fourier Transform (FFT) dan Enhanced Frequency Domain Decomposition (EFDD) Vallentino, Rizky; Aminullah, Akhmad; Suhendro, Bambang
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1286

Abstract

Abstrak   Jembatan merupakan infrastruktur vital dalam sistem transportasi yang memerlukan pemantauan kondisi struktural secara berkelanjutan. Penelitian ini bertujuan untuk menganalisis karakteristik dinamis jembatan box girder dengan bentang 50 meter menggunakan dua metode dalam Operational Modal Analysis (OMA), yaitu Fast Fourier Transform (FFT) dan Enhanced Frequency Domain Decomposition (EFDD). Data percepatan direkam oleh tiga sensor akselerometer yang dipasang pada satu bentang, dengan fokus pada sumbu vertikal (Z) untuk merepresentasikan respons struktur akibat eksitasi alami dari beban lalu lintas kendaraan (traffic-induced vibrations). Analisis menggunakan perangkat lunak PyOMA menunjukkan bahwa FFT mengidentifikasi dua frekuensi alami vertikal sebesar 2,672 Hz dan 3,207 Hz, sementara EFDD mendeteksi frekuensi sebesar 2,632 Hz dan 3,202 Hz, dengan selisih hanya 1,50% dan 0,16%. FFT efektif dalam memberikan gambaran awal terhadap spektrum frekuensi dan mendeteksi puncak dominan, sementara EFDD menawarkan kelebihan dalam memperkirakan redaman modal, mengekstraksi bentuk mode, serta mengidentifikasi mode yang berdekatan. Hasil ini menunjukkan bahwa kombinasi kedua metode mampu meningkatkan akurasi identifikasi modal dan mendukung penerapan sistem Structural Health Monitoring (SHM) berbasis data eksitasi alami secara efisien dan akurat.   Kata kunci: SHMS, Analisis Modal Operasional, PyOMA, FFT, EFDD     Abstract   Bridges are vital infrastructure in transportation systems that require continuous structural condition monitoring. This study aims to analyze the dynamic characteristics of a 50-meter span box girder bridge using two methods in Operational Modal Analysis (OMA), namely Fast Fourier Transform (FFT) and Enhanced Frequency Domain Decomposition (EFDD). Acceleration data were recorded by three accelerometer sensors installed on a single span, focusing on the vertical (Z) axis to represent the structural response due to natural excitation from traffic-induced vibrations. Analysis using the PyOMA software showed that FFT identified two vertical natural frequencies at 2.672 Hz and 3.207 Hz, while EFDD detected frequencies of 2.632 Hz and 3.202 Hz, with differences of only 1.50% and 0.16%, respectively. FFT is effective for providing an initial overview of the frequency spectrum and identifying dominant peaks, whereas EFDD offers advantages in estimating modal damping, extracting mode shapes, and identifying closely spaced modes. These results indicate that the combination of both methods can enhance the accuracy of modal identification and support the efficient and accurate implementation of Structural Health Monitoring (SHM) systems based on ambient excitation data.   Keywords: SHMS, Operational Modal Analysis, PyOMA, FFT, EFDD
Co-Authors Achmad Basuki Ade Trias Safrudin Adhe Noor Patria, Adhe Noor Aisyah Aisyah Akhmad Aminullah Ali Awaludin Ali Awaludin Aminnullah, Akhmad Aminullah, Akhmad Anas Puri, Anas Anno Mahfuda Bambang Supriyadi Hary Christady H. Hary Christady Hardiyatmo, Hary Christady Heribertus Sigit Kianjaya Iman Satyarno Kabul Basah Suryolelono Luki Hariando Purba Nasution, Multilawati Nuryanti, Pingkan Panji Krisna Wardana Purbolaras Nawangalam Raka Bagus Panuntun Renga Rao Krishnamoorthy Rini Kusumawardani, Rini Sulityo, Djoko Suprapto Siswosukarto Suprapto Siswosukarto Taqia Rahman Vallentino, Rizky Veithzal Rivai Zainal Wardhani Sartono Wira Sucitra Ibrahim Yuliar Azmi Adhitama