An improved pseudo-static method for seismic resistant design
of underground structures
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Liu Rushan (ÁõÈçɽ) 1 and Shi Hongbin (ʯºê±ò)2
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1£®Institute of Engineering Mechanics, China Earthquake Administration,
Harbin 150080, China
2£®Heilongjiang Institute of Technology, Harbin 150050, China
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Abstract:
This paper describes a commonly used
pseudo-static method in seismic resistant design of the cross section of
underground structures. Based on dynamic theory and the vibration
characteristics of underground structures, the sources of errors when using this
method are analyzed. The traditional seismic motion loading approach is replaced
by a method in which a one-dimensional soil layer response stress is
differentiated and then converted into seismic live loads. To validate the
improved method, a comparison of analytical results is conducted for internal
forces under earthquake shaking of a typical shallow embedded box-shaped subway
station structure using four methods: the response displacement method, finite
element response acceleration method, the finite element dynamic analysis method
and the improved pseudo-static calculation method. It is shown that the improved
finite element pseudo-static method proposed in this paper provides an effective
tool for the seismic design of underground structures. The evaluation yields
results close to those obtained by the finite element dynamic analysis method,
and shows that the improved finite element pseudo-static method provides a
higher degree of precision.
Keywords:
underground structures; seismic
design; finite element method; pseudo-static method; dynamic analysis method
