Seismic Response and Pile Foundation Efficiency of an Irregular Hospital Building with Double Friction Pendulum System

Raden Buyung Anugraha Affandhie; Kohar Yudoprasetyo; Moh. Fadhlan Rosyidi; Ifarrel Rachmanda Hariyanto; Moh. Safi’i Mansur; Wiku Suryawidodo

doi:10.22487/renstra.v7i2.884

Authors

Raden Buyung Anugraha Affandhie Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Kohar Yudoprasetyo Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia https://orcid.org/0000-0003-1274-1052
Moh. Fadhlan Rosyidi Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Ifarrel Rachmanda Hariyanto Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Moh. Safi’i Mansur Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Wiku Suryawidodo Student Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

DOI:

https://doi.org/10.22487/renstra.v7i2.884

Keywords:

base isolation, double friction pendulum system, irregular building, Pile foundation, seismic response

Abstract

Hospital buildings are essential facilities that require adequate seismic performance to maintain post-earthquake functionality. This study evaluates the influence of a Double Friction Pendulum System (FPS) on the seismic response and pile-foundation demand of a nine-story irregular hospital building in Malang, Indonesia, designed in accordance with SNI 1726:2019. Fixed-base and FPS models were analyzed using a 5% damped response spectrum, with structural performance assessed through fundamental period, base shear, lateral displacement, interstory drift, and isolator displacement. Pile-foundation demand was evaluated from the governing support reactions, while the axial resistance of 600 mm prestressed concrete spun piles was determined from subsurface investigation data using the Décourt method. Foundation efficiency was quantified based on the total installed pile length required by each structural alternative. The FPS increased the dominant structural period to 3.063 s in the X direction and 2.580 s in the Y direction and reduced average interstory drift by 73.6–81.7% and 42.8–83.3%, respectively, relative to the fixed-base alternatives. The maximum resultant isolator displacement was 70.64 mm, corresponding to approximately 31.9% of the design displacement capacity of 221.11 mm. The FPS alternative reduced the total installed pile length from 4692 m to 1800 m, indicating a potential foundation-efficiency improvement of 61.63% under the adopted structural and geotechnical assumptions. The main contribution of this study is the integration of seismic-isolation performance with pile-foundation demand for an irregular essential building. Further verification through detailed pile-capacity, settlement, pile-group, and soil–pile–structure interaction analyses is recommended

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