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All Journal G-Tech : Jurnal Teknologi Terapan
Josia Irwan Rastandi
University of Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Nonlinear Time-History Evaluation of Interstory Lead Rubber Bearing (LRB) Isolation in Reinforced Concrete Buildings Angela Ayu Putri; Josia Irwan Rastandi; Jessica Sjah
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.9654

Abstract

Seismic isolation is widely recognized as an effective strategy for mitigating earthquake-induced structural response. However, most studies have focused on base-isolated systems, whereas interstory isolation remains less explored. In particular, research on interstory LRB isolation for multistory reinforced concrete buildings in Indonesia remains limited. This study investigates a 13-story reinforced concrete dual-system building equipped with interstory Lead Rubber Bearing (LRB) isolators between the first and second floors. Two configurations are considered: fixed-base and interstory-isolated models. Seismic performance is evaluated through nonlinear time-history analysis using eleven ground-motion record pairs selected to represent Indonesian seismic hazard conditions, with nonlinear behavior considered for the isolators and critical ground-story elements. This study contributes to the limited research on interstory LRB isolation by clarifying how seismic demands are redistributed in a dual RC building under Indonesian hazard-consistent ground motions. Results show that interstory LRB isolation elongates the fundamental period from 0.91–1.51 s to 2.64–2.94 s, reduces base shear by 32–37%, decreases overturning moment by 71–78%, and lowers maximum interstory drift ratio from 1.87% to 0.52% in X and from 2.48% to 0.87% in Y. These results demonstrate that interstory LRB isolation is a promising alternative when conventional base isolation is impractical.
Seismic Performance Evaluation of Laboratory Building with Concrete Column Jacketing Based on ASCE 41-17 using Pushover Analysis Aditya Rihadatul Aisy; Josia Irwan Rastandi; Jessica Sjah
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.9704

Abstract

This study presents comprehensive seismic performance evaluation on the laboratory building structure designed using the old regulations (SNI 1726:2002 and SNI 2847:2002) and has been strengthened with concrete column jacketing through a pushover analysis procedure based on ASCE 41-17 guidelines. Based on the global performance of the structure, the structure drift have met the performance targets with a maximum drift of 1.92% for the X direction and 1.96% for the Y direction. Based on the analysis of the deformation-controlled action, the rotation values ​​that occur in the beam components have met the performance targets with a maximum rotation of 0.0066 for negative moments and 0.0073 for positive moments. While the strain that occurs in the column components have also met the performance targets with a maximum strain of 0.0032 for rebar compression strain, 0.0131 for rebar tensile strain, and 0.0024 for concrete compression strain. Then, based on the analysis of the force-controlled action, the DCR values ​​for shear and axial in the column components have met the performance targets with a maximum value for shear of 0.89 and for axial of 0.61. While the DCR values ​​for shear in the beam components partially exceed the performance targets with a maximum value of 1.29.
Co-Authors Aditya Rihadatul Aisy Angela Ayu Putri Jessica Sjah