Dynamic Modeling of Underground Structure Based on Viscoelastic Boundaries under Construction Vibration

doi:10.16183/j.cnki.jsjtu.2012.01.014

Abstract

Abstract:

A three-dimensional finite element model based on viscoelastic boundaries was developed to effectively capture the dynamic behavior of the metro transfer hall hub of the People's Square. Dynamic characteristics of the underground structure during vibration induced by dismantling temporary reinforced-concrete supporting system were studied, resorting to the Newmark method. In-situ monitoring data were used to calibrate the proposed method in this paper. The results show dynamic characteristics of the underground structure under vibration loading are accurately simulated by the presented model based on viscoelastic boundaries, and thus spurious reflections on the interface of soil and structure can be effectively eliminated. Prediction on the possibility of structural resonance under vibration loading can also be made by the proposed model, which is of benefit to decision making of engineering design and construction.

Key words: demolition vibration, underground structure, viscoelastic boundary, dynamic characteristics

CLC Number:

U459.3

YU Hai-tao, YUAN Yong, ZHU Yi-min, WANG Jian-hua. Dynamic Modeling of Underground Structure Based on Viscoelastic Boundaries under Construction Vibration[J]. Journal of Shanghai Jiao Tong University, 2012, 46(01): 64-68.

Figures/Tables 9

Fig. 1

Tab. 1

Fig. 2

Fig. 3

Tab. 2

Fig. 4

Fig. 5

Tab. 3

Fig. 6

结构	ρ/(g·cm^-3)	E/GPa	μ
立柱C50	2.65	35	0.170
梁板C30	2.50	30	0.167

模态	f/Hz
1	3.034 8
2	3.537 4
3	4.283 0
4	4.965 0
5	5.109 7
6	5.140 5
7	5.220 0
8	5.709 6
9	5.975 3
10	6.103 3

测点	ε_max×10^-6		ε_min×10^-6
测点	实测值	模拟值	实测值	模拟值
A水平	99.18	92.26	-144.41	-139.77
B水平	79.35	83.11	-89.19	-92.55
B竖直	88.07	87.98	-98.39	-105.08
C水平	66.65	80.57	-68.24	-71.19
D水平	52.71	62.62	-40.92	-55.24

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