# 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)
• 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.

#### File

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

Fig. 2. Hachinohe earthquake wave (long wave)

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

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

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

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

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

Table 2. Ground properties

Table 3. Properties of building structural members

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

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

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

#### Acknowledgement

Supported by : 수원대학교

#### References

1. Hwang, T.H. (2000), A comparative study between finite element method and finite difference method on variation of lateral earth pressure in NATM tunnel analysis, Master's Degree, Dankook University Graduate School, Dankook University, pp. 54.
2. Itasca Consulting Group, Inc. (2005), Fast lagrangian analysis of continua, Ver. 5.0, Itasca Consulting Group Inc., Minnesota, USA.
3. Kim, D.G. (2013), Dynamics of structures, Goomibook, Seoul, pp. 779.
4. Koo, H.J., Kim, H.J. (2015), "Natural period and damping ratio of RC buildings for serviceability design", Journal of the Architectural Institute of Korea Structure and Construction, Vol. 31, No. 2, pp. 37-44. https://doi.org/10.5659/JAIK_SC.2015.31.2.37
5. Lysmer, J., Kuhlemeyer, R.L. (1969), "Finite dynamic model for infinite media", Journal of the Engineering Mechanics Division, Vol. 95, No. 4, pp. 859-877.
6. MIDAS Information Technology Co. (2012), MIDAS CIVIL user manual, MIDAS Information Technology Co., Korea, pp. 551.
7. MIDAS Information Technology Co. (2016), MIDAS GTS NX user manual, MIDAS Information Technology Co., Korea, pp. 445.
8. Ministry of Land, Infrastructure and Transport (2016), Concrete standard specification, pp. 358.
9. National Disaster Management Research Institute (2012), Development of the public buildings emergency integrity assessment technology using seismic acceleration response signal, National Disaster Management Research Institute, Korea, pp. 253.
10. Park, S.S., Moon, H.D., Park, S.H. (2015), "A study on dynamic analyses of cut and cover tunnel during earthquakes", The Korean Society of Engineering Geology, Vol. 25, No. 2, pp. 237-250.
11. Son, S.H. (2012), An analysis of effect of vibration in urban tunnel blasting, Master's Degree, Inha University Graduate School, Inha University, pp. 49.
12. Western Metro (2016), Final design of private infrastructure investment project on ${\bigcirc}{\bigcirc}-{\bigcirc}{\bigcirc}$ double track railway (zone 4), Tunnel Analysis Report, pp. 906.
13. You, K.H., Kim, Y.J. (2018), "A preliminary numerical analysis study on the seismic stability of a building and underground structure by using SSI", Journal of Korean Tunnelling and Underground Space Association, Vol. 20, No. 1, pp. 23-38. https://doi.org/10.9711/KTAJ.2018.20.1.023
14. You, K.H., Park, Y.J., Hong, K.Y., Lee, H.K., Kim, J.K. (2005), "Numerical estimation for safety factors of tunnels considering the failure of supports", Journal of Korean Tunnelling and Underground Space Association, Vol. 7, No. 1, pp. 37-49.