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Wisnumurti
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Journal : Rekayasa Sipil

 1 
Prediction of Creep Concrete in Lightweight Concrete with Pumice as Coarse Aggregate Maulidyah, Chairah; Wisnumurti; Desy Setyowulan
Rekayasa Sipil Vol. 18 No. 3 (2024): Rekayasa Sipil Vol. 18 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2024.018.03.7

Abstract

Concrete creep is the additional strain that develops in concrete under constant stress over time. In this study, lightweight concrete is created by entirely replacing coarse aggregate with pumice to reduce the concrete's overall weight. The research involves producing 18 cylindrical concrete test specimens with a diameter of 150mm and a height of 300mm. These specimens include three normal and three lightweight concrete samples for each 90-day creep test and three normal and three lightweight concrete samples for compressive strength tests on the 14th and 28th days. The variation in aggregate proportions affects the aggregate content and weight in each type of concrete, influencing their properties. This is evident in the creep curves for the lightweight concrete samples. Similarly, the differences in the creep curves for normal concrete samples are attributed to stress distribution during loading. The strain acceleration between normal and lightweight concrete under load remains similar until the final loading day at 90 days. However, lightweight concrete significantly increases creep value after prolonged loading, rising by 35.85%. In contrast, normal concrete exhibits a creep increase of 16.51% from the beginning of loading until the 90th day.
Flexural Performance of a Semi-Precast Two-Way Slab with AAC Infill and Hybrid Bamboo–Steel Reinforcement under Point Loading Dwi Putra, Bagus Ginanjar; Dewi, Sri Murni; Wisnumurti
Rekayasa Sipil Vol. 19 No. 3 (2025): Rekayasa Sipil Vol. 19 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.03.3

Abstract

This study investigates the flexural performance of a semi-precast two-way ribbed slab system composed of a ferrocement bottom layer, Autoclaved Aerated Concrete (AAC) infill, and a hybrid bamboo–steel reinforcement configuration, subjected to a centrally applied point load. Two specimens were tested experimentally to evaluate their deflection behavior, crack patterns, and ultimate load capacity. The Finite Element Method (FEM) was also used to simulate the slab’s response and validate the experimental outcomes. The experimental results indicated ultimate load capacities of 5277 kg and 5000 kg for specimens S1 and S2, with corresponding maximum deflections of 6.80 mm and 6.90 mm. Diagonal cracks were observed originating from the load application point, which was consistent with flexural behavior under concentrated loading. The FEM simulation predicted an ultimate load of 5500 kg and a maximum deflection of 6.38 mm, resulting in a load deviation of +4.44% and a deflection deviation of –6.97% relative to the experimental average. Despite idealized assumptions in the numerical model, the FEM results showed good agreement with experimental observations in terms of deformation patterns and stress distribution. These findings demonstrate the potential of the proposed slab system for structural applications incorporating lightweight materials and alternative reinforcements. Further studies are recommended to explore its dynamic performance and practical feasibility in sustainable construction practices.
Structural Damage Assessment and Seismic Performance Optimization (case study: Ambon City Regional Representative Council Building) Madobaafu, Sarivanoly; Wibowo, Ari; Wisnumurti
Rekayasa Sipil Vol. 19 No. 3 (2025): Rekayasa Sipil Vol. 19 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.03.7

Abstract

The earthquake in Ambon City in 2019 damaged several buildings, including the DPRD building. This study aims to evaluate the seismic performance of the building and identify effective structural strengthening methods. The method used is pushover analysis, with structural modeling carried out using SAP2000 v.26. Lateral loads are applied gradually until the structure collapses. Secondary data in technical drawings and building documentation are used to build a structural model in SAP2000. The analysis results show that before reinforcement, the maximum roof displacement (?) reached 0.352 meters, with a total building height of 17 meters, resulting in a drift ratio of 0.0207 in the X–X direction, which is assumed to be the weak axis. Based on the ATC-40 criteria, this condition indicates the structural performance level in the "Life Safety" category. Concrete jacketing was applied to critical columns identified from the initial analysis to improve the structural performance. After remodeling the structure in the post-reinforcement condition, the study showed a reduction in maximum displacement to 0.335 meters, with a drift ratio of 0.01970. Performance level of the structure improved to the "Damage Control" category, indicating that the structure has better deformation capacity and lower potential for damage in the event of a similar-intensity earthquake.
Co-Authors Abram Guardinata Sinamo Achfas Zacoeb Achfas Zacoeb Agoes Soehardjono Agoes Soehardjono Moesono Djojoatmodjo Ahmad Abiyyu Musyafa' Akhmad Reza Irhamy Amanda Natalia Veronicha Angelo Adrian Ibrahim Antariksa Ari Wibowo Badruz Zamanul Mughni Bhondana Bayu Brahmana Kridaningrat Budi Kurniawan Desy Setyowulan Devi Nuralinah Dwi Putra, Bagus Ginanjar Elang Yudha Mas Adibronto Halawane, Francisius Marcelleon Hasyr Thawaf Syahristany Rahman Indradi Wijatmiko Kartika Puspa Negara Kevin D. E. Silitonga Kusnul Prianto, Kusnul Lalita Nurul Azizah Lathiif Anggoro, Adik Muhammad M. Hamzah Hasyim Madobaafu, Sarivanoly Maulana Rizqi Riwawo Maulidyah, Chairah Mohammad Raihan Hamzah Ovie Olita Indriansi Permana Akbar Maulana Prasetyo Purwaningrum, Putri Retno Anggraini Roland Martin Simatupang Saifoe El Unas Sarwono Sri Murni Dewi Yohanes Kevin Zidan, Mohammad Akrom