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Ashar Saputra
Universitas Gajah Mada
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Development of Information Systems in the Jayapura Regency Regional Disaster Management Agency Rimindubby, Vriska D.S; Satyarno, Iman; Saputra, Ashar
Jurnal Ilmiah Multidisiplin Indonesia (JIM-ID) Vol. 2 No. 02 (2023): Jurnal Ilmiah Multidisiplin Indonesia (JIM-ID), July
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58471/esaprom.v2i02.2423

Abstract

BPBD Jayapura Regency is a government agency that coordinates and handles disaster issues in the Jayapura Regency. Jayapura Regency has geographical, geological, hydrological, and demographic conditions that have the potential for disasters that need to be handled both pre-disaster, during emergency response, and post-disaster. Disaster information delivery, both knowledge about disaster or disaster reports to the community, information on BPBD activities, and news about BPBD is currently carried out through socialization in the community. So that there are often many conflicts due to incorrect news in the community related to BPBD's work programs, besides that BPBD Jayapura Regency itself does not yet have an integrated communication media that is directly connected to the people of Jayapura Regency. System An Information system in the form of a website was built to help related parties, namely BPBD Jayapura Regency and the community to be directly connected. This system was built using XAMPP as a web server and MySQL as a database server using the SQL programming language, PHP programming language is run on the server side so that the website becomes more dynamic. The analysis method used Use Case Diagram as a description of interactions that occur in the system. This system provides disaster reporting and complaint services This system also helps the BPBD in displaying information related to BPBD and disasters. This system will display information to the community and access to view disaster data reports that occur in the village added by each village or district head in Jayapura Regency.
PANEL DINDING GEOPOLIMER DENGAN PERKUATAN WIREMESH Putri, Andini Pratiwi; Satyarno, Iman; Saputra, Ashar
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 (523.75 KB) | DOI: 10.21831/inersia.v16i1.31312

Abstract

ABSTRAK Pengembangan fly ash berbasis geopolimer sangat cocok untuk memperluas aplikasi pracetak khususnya panel dinding pada lingkungan asam sulfat. Panel berbahan abu terbang ini dapat dijadikan pertimbangan karena memiliki keunggulan diantaranya kekerasan tinggi, ramah lingkungan, tidak menghasilkan gas karbon (CO2), tahan pada temperatur panas antara 600-800° C, tahan lingkungan asam, dan tidak memerlukan perawatan panas. Untuk pembuatan struktur panel pracetak menggunakan bahan pengisi berupa mortar berbahan geopolimer dengan komposisi NaOH 14 M, rasio NaOH/Na2SiO3 sebesar 1 :2, rasio alkaline : fly ash sebesar 35%, dan menggunakan variasi wiremesh sebagai perkuatan, dengan ukuran benda uji panel 800x400x40 mm. Hasil yang didapat kuat tekan umur 1 hari sebesar 11.27 MPa umur 28 hari 60,84 MPa, dengan nilai modulus 28 hari sebesar 13808 MPa. Pengujian kuat tarik 1 hari sebesar 1.02 MPa dan 28 hari sebesar 2,95 MPa Pengujian kuat lentur didapatkan 3,52 MPa tanpa perkuatan dan 4,52 dengan perkuatan. Kata kunci: Geopolymer, panel, wiremesh  ABSTRACT Geopolymer-based fly ash development is perfect for expanding precast applications especially wall panels in sulfuric acid environments. Panels made of fly ash can be considered because it has the advantage of high hardness, environmentally friendly, does not produce carbon gas (CO2), resistant to heat temperature between 600-800 ° C, resistant to acidic environment, and not require hot maintenance.To create the structure of precast panels using mortar filling material with geopolymer with composition NaOH 14 M, ratio of NaOH/Na2SiO3 is 1:2, ratio alkaline ratio: fly ash 35%, and use wiremesh variation, size of panel 800x400x40 mm. Results obtained compressive strength of 1 day 11.27 MPa, age 28 Days 60.84 MPa, modulus elasticity 28-day 13808 MPa. Result tensile strength 1-day 1.02 MPa and 28 days 2.95 MPa, frexural strength panel 3.52 MPa without wiremesh and 4.52 with wiremesh. Keywords: Geopolymer, panels, wiremesh
Numerical Simulation of RC Beam-Column Joint: Influence of Discrete Crack Modeling on Hysteresis Response Brihaspati, Brihaspati; Saputra, Ashar; Setiawan, Angga Fajar
ASTONJADRO Vol. 14 No. 4 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i4.19246

Abstract

Understanding the hysteresis behavior of reinforced concrete (RC) beam-column joints with monolithic slabs under cyclic loading is essential for assessing seismic performance. Finite element analysis (FEA) provides a powerful tool for such studies, but accurately capturing cyclic response remains challenging. This research aims to develop and validate an FEA model that provides the hysteresis behavior of an RC beam-column joint focusing on material modeling approaches and emphasizing the influence of discrete crack modeling in simulating major crack opening and closure. The numerical model is implemented in ABAQUS/Standard, combining the Concrete Damaged Plasticity (CDP) model for concrete, combined hardening for reinforcement, and discrete crack representation to enhance crack behavior simulation. The model is validated against previous experimental results by Durrani & Zerbe (1987) under the same cyclic loading protocol. The results show that least one discrete crack significantly enhances the agreement between numerical and experimental hysteresis loops, while two discrete cracks provide the best match for capturing pinching effect and cyclic stiffness degradation. The compression stiffness recovery parameter (wc) in CDP and the combined hardening model for reinforcement also play critical roles in influencing numerical results. The model successfully reproduces cyclic stiffness degradation and energy dissipation, although minor discrepancies exist due to material data limitations. This study advances numerical modeling of RC beam-column joints under cyclic loading, emphasizing the importance of discrete crack modeling in enhancing simulation accuracy for seismic performance assessment.
Seismic Performance Evaluation of Simple Reinforced Masonry Houses with Brick Walls: Experimental and Numerical Approaches Pasya, Namira Risza; Saputra, Ashar; Setiawan, Angga Fajar; Priyosulistyo, Henricus
ASTONJADRO Vol. 14 No. 4 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i4.19253

Abstract

This study aims to evaluate the performance of brick houses against earthquakes through experimental and numerical approaches. The research objects include two single-story houses located at University of Gadjah Mada (UGM) and Turi, Sleman, Yogyakarta. Microtremor measurement was carried out using accelerometers to record building vibrations, which were then analyzed using Fast Fourier Transform (FFT) to obtain the natural frequency on site of the structure. Numerical modeling was carried out using finite element analysis to validate and asses the building’s frequency response to earthquake loads based on Service Level Earthquake (SLE), Design Basis Earthquake (DBE), and Maximum Considered Earthquake (MCE). The results of the study indicate that the modeling can be validated based on the natural frequency approach from field and numerical evaluate. The maximum displacement that occured at the SLE, DBE, and MCE levels exceeded the allowable limits, indicating that both houses are in an unsafe condition. The structural performance evaluation based on Federal Emergency Management Agency (FEMA 356) shows that the houses in UGM and Turi fall into the Collapse Prevention (CP) category, which mean that the building can no longer be used as houses on the verge of collapse. Although the maximum acceleration analysis of the houses indicates that the values are lower than the design peak ground acceleration (PGAM), structural failure may still occur. The results of this study are expected to provide insights into earthquake-resistant house design as well as recommendations for improving structural resistance to seismic load.
Finite Element Analysis of Plastic Behavior in RC Beam Supports with Composite Steel Deck Slabs under Cyclic Loading Brihaspati, Brihaspati; Saputra, Ashar; Setiawan, Angga Fajar; Sulistyo, Djoko
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.34-45

Abstract

The performance of beam supports is essential for seismic resilience, particularly under the Strong Column–Weak Beam (SCWB) principle. To improve construction efficiency, steel deck-based composite slabs are increasingly adopted as alternatives to conventional slabs. However, their impact on the plastic behavior of beam supports remains underexplored. This study evaluates the influence of steel deck slabs using finite element analysis in ABAQUS. Two beam-column joint models—conventional and modified—were subjected to cyclic loading according to FEMA 461. The models incorporated stiffness recovery, combined hardening for steel, and a cohesive zone model (CZM) for the concrete–steel deck interface. Results indicate that the steel deck model shows a wider hysteresis loop and 2.425% higher energy dissipation, but experiences earlier reinforcement yielding and greater stiffness degradation. Although ductility increases, plastic hinges form at nearly the same cycle. Overall, the steel deck system improves energy absorption and ductility but reduces elastic stiffness and accelerates inelastic behavior.
Co-Authors Adityawan, Muh. Handy Dwi Agus Darmawan Adi Andreas Triwiyono Arianto, Niky Brihaspati, Brihaspati Djoko Sulistyo Firman Syarif Gabriella Agnes Luvena, Gabriella Agnes Hariyanto, Gatot Henricus Priyosulistyo, Henricus Hermansyah Hermansyah Iman Satyarno M.Fauzie Siswanto, M.Fauzie Muhammad, Heidi Nurokhman, Nurokhman Pasya, Namira Risza Pratama, Hamdi Y. Putra, Whelly T. Putri, Andini Pratiwi Richo Andi Wibowo Rimindubby, Vriska D.S Satmoko, Tranggono Aji Setiawan, Angga F. Setiawan, Angga Fajar Siswanto, Muhammad Fauzie Suprapto Siswosukarto