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- Title
基于 IDA 的铁路超高墩地震易损性分析.
- Authors
范 鑫; 王新敏; 陈士通
- Abstract
To investigate the seismic performance of railway super-high pier structure and evaluate its vulnerability under bi-directional earthquake action, a super-high pier structure of high-speed railway in the western mountainous area is used in this study. According to the dynamic characteristics of the structure itself, the curvatures corresponding to the strain state of the material are taken as the damage indexes to describe its different damage states, and the quantified damage index limits are determined for different damage levels. Based on incremental dynamic analysis ( IDA) method, 10 groups of far-field ground motions are selected from PEER database as input samples of bi-directional ground motions. The finite element model of super-high pier is established on ANSYS for nonlinear dynamic time-history analysis, and the structural seismic responses corresponding to different intensity ground motions are obtained. Combined with the log-regression analysis of capacity-demand ratio, the probabilistic seismic demand model of each control section of super-high pier is established to evaluate its vulnerability, and the first-order boundary method is used to calculate the structure damage probability to establish the vulnerability curve. It is observed that all parts of H-type double-column thin-walled hollow superhigh pier will be damaged to some extent under strong earthquake, and the damage at the bottom of the pier is the most serious. The exceeding probabilities of slight damage, moderate damage and complete damage at the bottom of super-high pier is 98. 71%, 96. 92% and 36. 02% respectively when PGA is 1. 0g. The probability of complete damage of the structure is small, which meets the requirements of three-level seismic fortification and has good anti-collapse ability. Vulnerability analysis can accurately reflect the real seismic performance of super-high piers and provide theoretical basis for post-earthquake damage reinforcement or design of super-high piers in practical projects.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p123
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209290004