[1]马高,邹雅峰.FRP加固震损RC柱建模方法及骨架模型研究[J].自然灾害学报,2021,30(01):089-98.[doi:10.13577/j.jnd.2021.0109]
 MA Gao,ZOU Yafeng.Investigation of modeling method and skeleton curve of earthquake-damaged RC columns retrofitted with FRP[J].,2021,30(01):089-98.[doi:10.13577/j.jnd.2021.0109]
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FRP加固震损RC柱建模方法及骨架模型研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
30
期数:
2021年01期
页码:
089-98
栏目:
出版日期:
2021-02-28

文章信息/Info

Title:
Investigation of modeling method and skeleton curve of earthquake-damaged RC columns retrofitted with FRP
作者:
马高12 邹雅峰1
1. 湖南大学 土木工程学院, 湖南 长沙 410082;
2. 工程结构损伤诊断湖南省重点实验室(湖南大学), 湖南 长沙 410082
Author(s):
MA Gao12 ZOU Yafeng1
1. College of Civil Engineering, Hunan University, Changsha 410082, China;
2. Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province(Hunan University), Changsha 410082, China
关键词:
震损RC柱FRP加固OpenSees有限元模型骨架曲线
Keywords:
earthquake-damaged RC columnsFRP retrofitOpenSeesfinite element modelskeleton curve
分类号:
TU528.1;X9
DOI:
10.13577/j.jnd.2021.0109
摘要:
为研究震损RC柱采用FRP (Fiber Reinforced Polymer,FRP)加固修复后的抗震性能,本文基于OpenSees仿真平台,根据震后RC柱的表观损伤状态提出FRP加固震损RC柱的有限元模型建立方法。对FRP加固震损RC柱进行5120种工况的Pushover分析,采用三折线荷载-位移骨架曲线,研究损伤状态对骨架曲线特征点参数的影响规律,并通过数据回归分析提出FRP加固震损RC柱的骨架曲线计算模型。分析结果表明:损伤会降低FRP加固RC柱的承载力及刚度,且降低程度随损伤指数的增大而增加,两者近似成抛物线关系;在DS-5损伤状态下,相比于FRP加固完好RC柱,FRP加固震损RC柱的屈服承载力Py、峰值承载力Pc、弹性刚度K1、弹塑性刚度K2及下降段刚度K3的均值下降17.9%、14.5%、41.8%、43.1%和19.9%;损伤对FRP加固RC柱弹性刚度和弹塑性刚度的降低程度明显高于屈服承载力和峰值承载力;文中提出的FRP加固震损RC柱骨架曲线计算模型具有较高精度。
Abstract:
In order to study the seismic performances of earthquake-damaged RC columns retrofitted with fiber reinforced polymer (FRP), the OpenSees analysis software was used to establish the finite element model of FRP-retrofitted earthquake-damaged RC columns based on the damage states of earthquake-damaged RC columns. 5120 pushover analyses of FRP-retrofitted earthquake-damaged RC columns were carried out. Adopting the tri-linear load-displacement skeleton curve, the influences of damage states on the feature points of the skeleton curve were studied, and a calculation model for the skeleton curves of the FRP-retrofitted earthquake-damaged RC columns was proposed by data regression analysis. The analysis results showed that the damage reduced the bearing capacity and stiffness of the FRP-retrofitted RC columns, and the decrease degree of the bearing capacity and stiffness increased with the increase of damage index, exhibiting a parabolic relationship. Compared with the FRP-retrofitted intact RC columns, the mean values of the yield bearing capacity Py, the peak bearing capacity Pc, the elastic stiffness K1, the elasto-plastic stiffness K2 and the descending stiffness K3 of the FRP-retrofitted earthquake-damaged RC columns were reduced by 17.9%, 14.5%, 41.8%, 43.1% and 19.9% for the DS-5 damage state. The influences of damage on the reduction of elastic stiffness and elasto-plastic stiffness were significantly higher than that on the yield bearing capacity and the peak bearing capacity. The calculation model for the skeleton curves of the FRP-retrofitted earthquake-damaged RC columns had a relatively high accuracy.

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备注/Memo

备注/Memo:
收稿日期:2019-02-26;改回日期:2020-08-04。
基金项目:国家自然科学基金项目(51878268)
作者简介:马高(1985-),男,副教授,博士,主要从事结构抗震、FRP加固理论等研究.E-mail:magao@hnu.edu.cn
更新日期/Last Update: 1900-01-01