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Title |
Effect of Foundation Modeling in Nonlinear Static Analysis on the Seismic Performance Evaluation of Pilotis Buildings Strengthened with Steel Braces
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Authors |
장태수(Tae Soo Jang) ; 이영욱(Young-Wook Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.5.655 |
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Keywords |
필로티 건물; 매트기초; 6자유도계 스프링; 내진성능; 보강 pilotis building; mat foundation; 6-DOF spring; seismic performance; restrengthened |
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Abstract |
The effect of mat foundation modeling on the seismic performance of low-rise pilotis buildings was evaluated using nonlinear static analysis. The seismic performance of the example building with unidirectional or bidirectional eccentricity was evaluated after being stiffened with steel braces, in accordance with the Seismic Performance Evaluation Guidelines (SPEG, 2021). The mat foundation was modeled using the fixed-end (FE) approach per SPEG (2021) and a spring model with finite stiffness according to ASCE/SEI 41-23. Additionally, in cases of foundation tension, a fixed-end model allowing uplift (FE-R) per SPEG (2021) was analyzed. For both example buildings, the maximum reaction force predicted by the spring model was lower than that of the FE and FE-R models. This reduction is attributed to the spring model’s distribution of concentrated forces due to spring stiffness and yielding. Moreover, the ratio of the reaction force to the bearing capacity of the foundation in the spring model was smaller than that of both the FE and FE-R models.
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