Development of improved modal pushover analysis and its application for seismic assessment of bridge structures = 개선된 모드별 비탄성 정적해석법의 개발과 교량구조물에 대한 적용

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This thesis presents nonlinear static procedures for seismic assessment of cable-stayed bridges, especially by improved modal pushover analysis. To enhance the procedure’s accuracy, the key feature of the improved modal pushover analysis, which is the approximate elastic deformed shape, is improved to reduce the maximum error rates. Applying improved modal pushover analysis with other conventional nonlinear static procedures on multi-span continuous bridges, these procedures’ applicability and trouble spots have been studied. Moreover, the applicability of the improved modal pushover analysis has been verified by applying it to numerous multi-span continuous bridges with several earthquake motions. In addition, the relationship between overall result error rates and approximate elastic deformed shape error has been researched, and it is verified that to secure the procedures’ accuracy, the assumption of the procedure, maintaining a deformed shape after system yielding, should be valid. The assumption is valid when the structure’s shape is relatively regular and the stiffness ratio of pier and deck does not have a certain value. NSPs were also applied on cable-stayed bridges with a number of earthquake motions. The single-mode pushover analysis methods could not produce reasonable results at relatively stiffer sections of the system, such as the tower of a cable-stayed bridge. Multi-mode pushover analysis methods show reliable results with every part of cable-stayed bridges. However, when the introduced reliability indexes, approximate elastic deformed shape error index and earthquake property index have large values, these methods tend to underestimate structures’ deformation.
Advisors
Kwak, Hyo-Gyoungresearcher곽효경researcher
Description
한국과학기술원 : 건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
455282/325007  / 020065846
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 건설및환경공학과, 2010.08, [ 132 p. ]

Keywords

IMPA; bridge; cable-stayed bridge; PBSD; MPA; 모드별비탄성정적해석법; 개선된모드별비탄성정적해석법; 교량; 사장교; 성능기반내진설계

URI
http://hdl.handle.net/10203/30617
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=455282&flag=dissertation
Appears in Collection
CE-Theses_Ph.D.(박사논문)
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