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J. Ocean Eng. Technol. 2010;24(1):76-82.    

Seismic Response Analysis of Bridges Considering Spatial Variation of Input Ground Motion
Choi Kwang-Gyu,Kang Seung-Woo,Kook Seung-Kyu
Dept. of Civil Eng. Dong-A Univ.,Dept. of Civil Eng. Dong-A Univ.,School of Construction Pukyong National Univ.
입력지반운동의 공간적 변화를 고려한 교량의 지진응답해석
최광규,강승우,국승규
동아대학교 토목공학과,동아대학교 토목공학과,부경대학교 건설공학부
© 2010 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Seismic response, Input ground motion, Foundation-soil interaction
핵심용어: 지진응답, 입력지반운동, 기초-지반 상호작용
Abstract
This paper presents a seismic response analysis of bridge structures considering the spatial variation of input ground motion. In earthquake analyses of structures, it is usually assumed that the input ground motion is the same at every support. However, this assumption is not justified for long structures like bridges, because observations have shown that the earthquake ground motion can vary considerably within relatively small distances. When the soil under the foundation is relatively soft and deep, an analysis of the foundation-soil interaction must always be performed. To consider the foundation-soil interaction, a soil response analysis is performed first, and after determining the material characteristics of the foundation element obtained by this foundation-soil interaction analysis, the seismic response analysis of a bridge superstructure with equivalent springs and dampers is performed. Finally, the influences of the spatial variation in the input motion, which are affected by different soil characteristics, are considered.


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