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Title |
Effect of Foundation Modeling on the Seismic Performance of Re-strengthened RC Framed Structures: The Case of Isolated Foundations in School Buildings
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Authors |
이영욱(Young-Wook Lee) ; 이찬희(Chanhui Lee) ; 고수경(Sookyung Ko) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.4.489 |
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Keywords |
독립기초; 얕은기초; 6-자유도계 스프링; 내진성능평가; 내진보강된 RC 골조 isolated shallow foundation; 6-DOF spring; seismic performance; retrofitting RC frame |
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Abstract |
In this study, the effect of foundation modeling on the seismic performance after seismic retrofitting was investigated for a building with isolated shallow foundations and a large ratio of short sides to long sides such as found in a typical elementary school. To examine the effectiveness of seismic retrofitting, a three-story building located in seismic zone I and on soil profile type S2 was selected. The retrofitting design incorporated four variations of horizontal stiffness achieved through the use of steel bracing. For the nonlinear static analysis, two methods of modeling the foundation were used: the commonly used fixed-base model and a model incorporating six-degree-of-freedom (6-DOF) springs. The nonlinear static procedure was applied to each of the four re-strengthened models using both foundation modeling types to evaluate and compare the seismic performance of the RC frame and foundation. The results indicated that it is preferable to use 6-DOF springs, because using a fixed-base model will overestimate the lateral stiffness, which may lead to unsatisfactory performance of the foundation. However, the spring model can lead to brittle shear failure in the columns due to increased deformation. Therefore, care should be taken to limit the horizontal deformation in retrofitted buildings.
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