徐强,徐舒桐,陈健云,李静,钱坤.重力坝抗震性能的POA-ETA评价方法[J].水利学报,2018,49(8):986-994 |
重力坝抗震性能的POA-ETA评价方法 |
POA-ETA method for seismic performance evaluation of concrete gravity dam |
投稿时间:2018-01-24 |
DOI:10.13243/j.cnki.slxb.20180090 |
中文关键词: ETA POA 多阶振型 地震随机性 损伤指标 性能点 |
英文关键词: ETA POA multi-modes seismic randomness damage factor performance points |
基金项目:国家重点研发计划项目(2017YFC0404903);国家自然科学基金项目(51679030);大连市高层次人才创新支持计划项目(2016RQ015) |
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中文摘要: |
本文结合耐震时程法(ETA)和静力弹塑性分析法(POA)各自的优点,提出了能够考虑结构多阶振型、地震随机性影响的POA-ETA法,并以此对混凝土重力坝进行抗震性能分析。通过分别对ETA和POA基本原理进行分析,总结了POA-ETA法的基本原理以及实施的关键步骤。采用ETA法生成不同峰值加速度的ETA时程,并以此作为激励,得到结构的动力响应。通过动力响应结果,得到结构的能力谱曲线,延性比-等效周期比,延性比-等效阻尼比曲线,并以此代入POA法中评价结构的抗震性能。本文采用Koyna混凝土重力坝模型,使用提出的POA-ETA法对坝体结构“中等破坏”、“严重破坏”两种损伤指标所对应的性能点(谱位移)值进行计算,从而对坝体结构抗震性能及抗震指标进行分析。研究表明,采用POA-ETA法可以得出不同损伤程度下的抗震性能,具有一定的适用性。 |
英文摘要: |
In this paper, adopting the advantages of endurance time analysis (ETA) and pushover analysis (POA) method, the POA-ETA method is proposed to realize the seismic performance analysis of concrete gravity dam, which can consider the influence of structure's multi-modes and seismic randomness. According to the analysis on basic principle of ETA and POA method respectively, the principles and the key steps of POA-ETA method are established. In POA-ETA method, ETA method is used to generate ETA history,which describes increasing peak ground acceleration and is loaded as excitation,and to get the dynamic response of structures eventually. By analyzing dynamic response,the capacity spectrum,ductility ratio-equivalent period ratio and ductility ratio-equivalent damping ratio curves are acquired to bring in POA method to evaluate seismic performance of structures. The POA-ETA method is used to calculate performance points in ‘moderate damage’ and ‘severe damage’ factor, and further, to analyze seismic performance and damage factor of Koyna concrete gravity dam. The results show that the POA-ETA method has high accuracy and the applicability. |
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