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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Portal: Jurnal Teknik Sipil Jurnal Jalan Jembatan
Ediansjah Zulkifli
Civil Engineering and Environment Department, Bandung, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132,
Civil Engineering, Building, Construction & Architecture Engineering

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EFEKTIVITAS SUPERPLASTICIZER TERHADAP WORKABILITAS DAN KUAT TEKAN BETON GEOPOLIMER Herwani Herwani; Iswandi Imran; Bambang Budiono; Ivindra Pane; Ediansjah Zulkifli; Elvira Elvira
Portal: Jurnal Teknik Sipil Vol 10, No 2 (2018)
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/portal.v10i2.975

Abstract

Beton Geopolimer merupakan beton yang tersusun dari campuran agregat kasar dan halus tanpa pengikat semen Portland (OPC). Sebagai penggantinya, digunakan pengikat dari bahan yang banyak mengandung silica dan alumina seperti fly ash. Analog dengan beton yang berbasis semen Portland, beton geopolimer juga menjadi kurang sempurna jika campuran beton segar mempunyai konsistensi yang tinggi dan bersifat kental (kaku) sehingga sulit untuk dikerjakan (workabilitas rendah). Penambahan Superplastisizer manjadi salah satu cara untuk meningkatkan workabilitasnya. Dalam makalah ini digunakan superplastisizer yang berbasis naphthalene dengan dosis 0%, 1.5%, dan 2 %. Molaritas larutan NaOH yang digunakan sebagai aktivator alkalin adalah 8 M, 10 M, 12 M, dan 14 M dengan rasio Na2SiO3/NaOH = 1.5. Dari hasil pengujian diketahui bahwa pengaruh superplastisizer yang berbasis naphthalene cukup efektif untuk memperbaiki workabilitas beton geopolymer. Beton segar menjadi lebih encer dan mudah dilakukan pemadatan saat di tuang ke dalam cetakan. Superplastisizer juga mampu meningkatkan kekuatan beton geopolymer namun besaran hanya mencapai 5.42%. Dosis Superplastisizer akan optimum pada persentase 1.5% terhadap berat fly ash dengan kuat tekan mencapai 31.63 MPa dan nilai slump antara 8-10 cm. Molaritas larutan NaOH yang baik untuk rasio Na2SiO3/NaOH = 1.5 adalah 8 M.
Experimental Study and Numerical Model of Spruce and Teak Wood Strength Properties Under Compressive High Strain Rate Loading Ediansjah Zulkifli; Patria Kusumaningrum; Diah Puspita Rahmi
Journal of Engineering and Technological Sciences Vol. 53 No. 1 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.1.3

Abstract

Spruce and teak wood as anisotropic materials have complex behavior, particularly in the relationship between strain-rate and strength. High strain-rate compression tests between 590 s-1 and 3300 s-1 were carried out using two types of split Hopkinson pressure bar (SPHB) in order to measure the behavior of the wood along three principal axes with respect to fiber direction and growth rings. Numerical simulation using finite element software of the wood materials under high strain rates was performed and showed results with only a difference of 10% to the experimental results. The strain rate affects the strength of materials. In this case, it follows the power function, which means the higher the strain rate, the stronger the material.
Strength Enhancement, Ductility, and Confinement Effectiveness Index of Fly Ash-based Geopolymer Concrete Square Columns Herwani Herwani; Iswandi Imran; Bambang Budiono; Ediansjah Zulkifli
Journal of Engineering and Technological Sciences Vol. 54 No. 4 (2022)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2022.54.4.11

Abstract

Geopolymer concrete is an environmentally friendly construction material that has the potential to be applied in building structures. It is important to understand the structural behavior of geopolymer concrete. This paper presents an experimental investigation into the performance of structural elements of geopolymer concrete under concentric axial loads. The specimens were twelve square columns with a size of 170 x 170 mm and a height of 480 mm. The study variables were the tie spacing and the compressive strength of unconfined geopolymer concrete (f’c). The test results showed that the increase in f'cc was not as significant as the increase in unconfined concrete compressive strength (f'c). The value of strength enhancement (K) tended to decrease. The column ductility (m) and confinement effectiveness index (Ic) had optimum values. The effect of increasing the tie spacing (s) decreased the K, Ic, and m values of the column. The proposed f’cc formulation for geopolymer concrete is compatible.
Spectral Matching of Three-Component Seismic Ground Accelerations for Critical Structures Sindur P. Mangkoesoebroto; Adi Yasa; Ediansjah Zulkifli
Jurnal Teknik Sipil Vol 30 No 1 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.1.5

Abstract

Abstract This study introduces a new procedure for three-component spectral matching of seismic ground acceleration records. The procedure involves preserving the phase angle and varying the Fourier amplitudes to match the spectra of the recorded records with a provided target spectrum that represents the spectral values of ground motions in three orthogonal directions. Several three-component recorded records were matched against two target response spectra to test the method. An accurate convergence was achieved in the velocity and displacement records. In addition, the scales among the components’ magnitude were maintained, creating realistic three-component ground motions. Such ground motion inputs are important to qualify critical structures sensitive to three-component motions. Our proposed procedure is novel because the present practices are mostly created based on one-component ground motions. Keywords: Spectral matching, three components, component scales, phase angle, critical structures. Abstrak Studi ini mengusulkan prosedur baru terkait penyesuaian spektra catatan percepatan gempa. Prosedur ini dilakukan dengan mempertahankan sudut phasa tetapi mengubah amplitudo Fourier catatan percepatan gempa demikian hingga spektrumnya sesuai dengan target. Target spektrum yang diinputkan mewakili tiga komponen gempa. Untuk mengujinya, beberapa catatan gempa tiga-komponen disesuaikan spektrumnya terhadap dua target spektra. Ketelitian yang cukup baik terlihat dari catatan kecepatan dan simpangan. Skala ketiga komponen juga dijaga sehingga dihasilkan percepatan gempa tiga-komponen yang realistis. Percepatan gempa sejenis ini diperlukan dalam proses kualifikasi struktur penting yang sensitif terhadap pengaruh gerakan tiga arah. Prosedur tersebut adalah baru karena teknik yang ada sekarang didasarkan pada penyesuain spektrum per-komponen. Kata-kata Kunci: Penyesuaian spektra, tiga komponen, skala komponen, sudut phasa, struktur penting.  
The Risk of Failure Assessment in Bina Marga Standard Designed Prestressed Concrete Girder Bridges under B-WIM Load Measurement Widi Nugraha; Indra Djati Sidi; Made Suarjana; Ediansjah Zulkifli
Journal of Engineering and Technological Sciences Vol. 55 No. 5 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.5.5

Abstract

The use of precast prestressed concrete girder bridges in Indonesia has been increasing rapidly due to their high quality, reliability, and faster construction on site. The girder components are typically designed for a specific bridge span and can be prefabricated. The Directorate General of Highways of the Ministry of PUPR (Bina Marga) has released a standard design for prestressed concrete girder bridges with a typical span of up to 40 m. This design is based on the bridge loading standard SNI 1725 2016, which determines the live traffic load through consensus due to limited data on actual traffic load measurement results. However, the Ministry of PUPR has been implementing actual traffic load measurements using weigh-in-motion (WIM) technology to directly measure the load of passing vehicles. In this study, a risk assessment of the failure risk of a standard Bina Marga bridge with a 40-m span prestressed concrete girder type was conducted based on B-WIM load measurements. The results of this assessment indicate that the standard Bina Marga bridge has a failure risk of 1.48 x 10-4, which is smaller than the acceptable risk of failure according to the AASHTO LRFD Bridge Design Specification as referenced in SNI 1725 2016.
PENENTUAN FAKTOR BEBAN DINAMIS PADA JEMBATAN BERDASARKAN PENGUKURAN BRIDGE WEIGH-IN-MOTION Nugraha, Widi; Sidi, Indra Djati; Suarjana, Made; Zulkifli, Ediansjah
Jurnal Jalan Jembatan Vol 40 No 2 (2023)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58499/jatan.v40i2.1221

Abstract

Vehicle loading on bridges involves dynamic loads, exhibiting distinct behavior from static loads. Dynamic loads can lead to the phenomenon of dynamic load amplification, potentially increasing the effects of the static weight of vehicles on the bridge. Addressing these effects is crucial during bridge design to ensure safety. The Dynamic Amplification Factor (DAF) is employed in bridge design as a multiplier for the live load standard to account for these effects. This study aims to assess the DAF on two Bridge Weigh-in-Motion (B-WIM) systems in Indonesia: Pawiro Baru Bridge (ID-001) with an 18 m in span and Kaligawe Bridge (ID-004) with a 30 m in span. The methodology involves analyzing the bridge's structural response to passing vehicles using strain transducer sensors in the B-WIM system to calculate the DAF. Results indicate that the average DAF for light vehicles (GVW<25 ton) is 1.19 for ID-001 and 1.19 for ID-004. For heavy vehicles (GVW>=25 ton), it's 1.10 for ID-001 and 1.09 for ID-004. The analysis reveals a consistent correlation between DAF and GVW, with heavier vehicles yielding lower DAF values. This research suggests to a proposed DAF model as a function of GVW, which proved to be more efficient and accurate based on actual measurements. The model presents the potential to enhance the efficiency of bridge design. It generally yields lower DAF values compared to those stated in SNI 1725:2016, aiming to align design standards more closely with the actual dynamic behaviour of typical bridge types under varying vehicle loads. Keywords: bridge, dynamic amplification factor (DAF), Bridge Weigh-in-Motion (B-WIM), bridge design, gross vehicle weight (GVW)
Co-Authors Adi Yasa Bambang Budiono Bambang Budiono Diah Puspita Rahmi Elvira Elvira Herwani . Indra Djati Sidi Indra Djati Sidi Iswandi Imran Ivindra Pane Made Suarjana Patria Kusumaningrum Sindur P. Mangkoesoebroto Widi Nugraha Widi Nugraha, Widi