Pushover analysis for the seismic response prediction of cable-stayed bridges under multi-directional excitation

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• 作者：A. Camara ; ^{acamara@ciccp.es} ; M.A. Astiz ^{miguel.a.astiz@upm.es}
• 关键词：Pushover analysis ; Seismic excitation ; Nonlinear dynamics ; Cable-stayed bridges ; Computational cost
• 刊名：Engineering Structures
• 出版年：2012
• 期刊代码：55_01410296
• 类别：et
• 出版时间：August, 2012
• 卷：41
• 期：Complete
• 页码：444-455
• 文件大小：1050 K

摘要

Cable-stayed bridges represent nowadays key points in transport networks and their seismic behavior needs to be fully understood, even beyond the elastic range of materials. Both nonlinear dynamic (NL-RHA) and static (pushover) procedures are currently available to face this challenge, each with intrinsic advantages and disadvantages, and their applicability in the study of the nonlinear seismic behavior of cable-stayed bridges is discussed here. The seismic response of a large number of finite element models with different span lengths, tower shapes and class of foundation soil is obtained with different procedures and compared. Several features of the original Modal Pushover Analysis (MPA) are modified in light of cable-stayed bridge characteristics, furthermore, an extension of MPA and a new coupled pushover analysis (CNSP) are suggested to estimate the complex inelastic response of such outstanding structures subjected to multi-axial strong ground motions.