Abstract
Piloti-type structure is a popular architectural style consisting of only columns or minimum number of shear-resisting walls on the first floor. The large difference in lateral stiffness between the first and the upper floors makes the structure very vulnerable to earthquakes. Through the recent earthquakes in Gyeongju (2016) and Pohang (2017), due to such structural disadvantages, many damage cases have been reported, especially in low-rise piloti-type buildings with five stories or less. In this study, seismic soil-structure interaction (SSI) analysis is conducted on low-rise piloti-type buildings considering Korean geotechnical characteristics, and the effect is analytically evaluated. To achieve this goal, seismic SSI analysis applying the measured Gyeongju earthquake and design response spectrum (DRM) based on the architectural design codes are conducted by constructing three-dimensional structural analysis models with a five-story piloti-type building and four different soil properties: fill (FI), alluvial soil (AS), weathered soil (WS), and weathered rock (WR). From the analysis results, it is found that WS soil is largely affected by the seismic SSI, and the influence of the seismic SSI is different for each soil type regardless of the type of earthquake. Through the parameter study, simple and reasonable estimates are proposed to consider the SSI effect on the base shear in low-rise piloti-type buildings.
Highlights
Piloti type is a widely adopted architectural type for multiunit housing in Korea due to the advantage of efficient use of space on the first floor
The large difference in lateral stiffness between the floor of pilotis and the upper levels makes the structure very disadvantageous against earthquakes, causing the transverse shear deformation as shown in Figure 1(a), thereby resulting in shear failures in columns and walls in Figures 1(b) and 1(c) during earthquakes. rough the Gyeongju and Pohang earthquakes of magnitude 5.8 and 5.4 that occurred in Korea in August 2016 and November 2017, such damage cases have intensively been reported in piloti-type structures with five stories or less, and similar situations have been observed in different countries [2, 3]
The analysis results from the Gyeongju earthquake applied to the soil-structure finite element (FE) models described in Chapter 2 are summarized
Summary
Piloti type is a widely adopted architectural type for multiunit housing in Korea due to the advantage of efficient use of space on the first floor. From the fact that the damage cases of Gyeongju earthquake were concentrated on the low-rise piloti [4] and from the ASCE guideline [12] and the recent research results [13] that the influence of the inertial interaction is greater in a rigid structure with a short natural period (Tn < 1.0 sec) on mat or raft foundations, it is necessary to examine the influence of seismic SSI that occurs in low-rise piloti-type buildings occupying the absolute proportion of the architectural type. (d) domestic geotechnical properties for typical low-rise pilotitype buildings To achieve this goal, this study performs two steps of analytical procedure as follows. After the influence of the parameter is analyzed, simple and reasonable prediction values for the effect are presented, and these values are compared with the current architectural design guidelines
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