钢筋混凝土框架结构震损定量评定方法研究
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摘要
针对目前震后钢筋混凝土框架结构的损伤程度多以定性评定为主的现状,本文提出借助Pushover分析方法,并结合现有的国内外规范,通过考虑结构的层间位移、塑性铰发展、频率降低等指标的变化,对结构在地震作用下可能出现的五种破坏状态"基本完好、轻微损坏、中等破坏、严重破坏、倒塌"进行定量划分。以某8层振动台模型试验的框架结构作为工程实例进行Pushover分析,计算结构在8度基本地震作用下的反应,将分析结果与本文提出的震损定量评估综合指标相对比,得出该建筑物在不同地震作用下的破坏等级。结果表明,本文的分析结果与试验震害现象基本一致。
Considering most damage assessment is qualitative for post-earthquake reinforced concrete frame structures.In this paper,by considering displacement between layers,number and percentage of hinges,reduction of frequency with the Nonlinear Static Analysis method combined with the existing norms,the range between the five levels of structures' earthquake damage state:"basically intact,minor damage,moderate damage,severe damage,collapse" is quantitative divided.Through the Pushover analysis of a frame structure damaged,the response of the structure in 8 basic degree are gotten.The results of Pushover Analysis are compared with the comprehensive standards to acquire the damage state.A conclusion can be obtained that the results analyzed by the method introduced in this paper is in accordance with the actual seismic damage state.
Considering most damage assessment is qualitative for post-earthquake reinforced concrete frame structures.In this paper,by considering displacement between layers,number and percentage of hinges,reduction of frequency with the Nonlinear Static Analysis method combined with the existing norms,the range between the five levels of structures' earthquake damage state:"basically intact,minor damage,moderate damage,severe damage,collapse" is quantitative divided.Through the Pushover analysis of a frame structure damaged,the response of the structure in 8 basic degree are gotten.The results of Pushover Analysis are compared with the comprehensive standards to acquire the damage state.A conclusion can be obtained that the results analyzed by the method introduced in this paper is in accordance with the actual seismic damage state.
引文
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[2]倪雪.钢筋混凝土框架结构震损评定方法和可修指标研究[D].上海:同济大学,2012
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[8]ATC-40 Seismic evaluation and retrofit of concrete buildings[S].Applied Technology Council,1996
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[2]倪雪.钢筋混凝土框架结构震损评定方法和可修指标研究[D].上海:同济大学,2012
[3]小谷俊介.日本基于性能结构抗震设计方法的进展[J].建筑结构,2000,30(6):3-9
[4]Chopra A K,Goel R K.Capacity-demand-diagram methodsfor estimating seismic deformation of inelastic structures:SDF systems[R].Berkeley:University of California,1999
[5]叶燎原,潘文.结构静力弹塑性分析(Push-over)的原理和计算实例[J].建筑结构学报,2000,21(1):37-43
[6]地震灾后建筑鉴定与加固技术指南[M].北京:中国建筑工业出版社,2008
[7]杨雪萍,章红梅,吕西林.RC框架结构在中震作用下不同性能目标的弹塑性分析[J].结构工程师,2009,25(1):14-20
[8]ATC-40 Seismic evaluation and retrofit of concrete buildings[S].Applied Technology Council,1996
[9]施卫星,冯军.基于频率的结构损伤识别方法在建筑地震破坏等级划分中的应用[C]//第二十一届全国振动与噪声高技术及应用学术会议论文集,2008
[10]Prestandard and commentary for the seismic rehabilitationof buildings[S].Federal Emergency Management Agency,2000
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