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A comparative study on the numerical analysis program by SSI analysis of a high-rise building and an adjacent underground structure

초고층 건물과 인접지하구조물의 SSI 해석을 통한 수치해석 프로그램 비교 연구

  • You, Kwang-Ho (Dept. of Civil and Environmental Engineering, University of Suwon)
  • 유광호 (수원대학교 건설환경공학과)
  • Received : 2018.11.26
  • Accepted : 2019.01.03
  • Published : 2019.03.31

Abstract

Recently, earthquakes have occurred throughout the entire region of Korea and seismic analysis studies have been actively conducted in various fields. SSI analyses studies considering ground have been carried out consistently. However, few comparative analyses have been performed on the dynamic behavior of buildings according to numerical analysis method in the case of the previous dynamic analyses considering grounds. Therefore, in this study, the dynamic analyses were performed on a high-rise building by using both a finite element program MIDAS GTS NX and a finite difference program FLAC 2D. The results were compared and analyzed each other. As a result, both the maximum compressive and tensile bending stresses of above ground and below ground part were estimated to be a little larger by MIDAS GTS NX than by FLAC 2D. However, the maximum horizontal displacement value, the horizontal displacement distribution, and the position of weak part were turned out to be similar in both analysis programs. Therefore, it can be concluded that there is no difference in using either a finite element program or a finite difference program for the convenience of a user for a dynamic analysis.

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Fig. 1. The analysis section of 55 story a high-rise building with adjacent underground structure

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Fig. 2. Hachinohe earthquake wave (long wave)

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Fig. 3. The comparison of the horizontal displacement distribution of a high-rise building (excitation time = 12 seconds)

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Fig. 4. The comparison of acceleration spectra at the top floor (55 floor)

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Fig. 5. The comparison of inter-story drift ratio of a high-rise building (excitation time = 12 seconds)

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Fig. 6. The tensile bending stress distribution of a high-rise building and the adjacent underground structure computed by MIDAS GTS NX

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Fig. 7. The tensile bending stress distribution of a high-rise building and the adjacent underground structure computed by FLAC 2D (PGA 0.154 g, excitation time = 12 seconds)

Table 1. The comparison between two commercial programs in terms of dynamic analysis characteristics

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Table 2. Ground properties

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Table 3. Properties of building structural members

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Table 4. The comparison of the maximum horizontal displacement of a high-rise building (PGA = 0.154 g)

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Table 5. Inter-story drift ratio of a high-rise building (excitation time = 12 seconds)

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Table 6. The maximum bending stresses of above, below ground part and the adjacent underground structure (excitation time = 12 seconds)

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Acknowledgement

Supported by : 수원대학교

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