配置高强钢筋混凝土框架结构的地震易损性分析
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摘要
为研究地震作用下配置不同高强钢筋的混凝土框架结构的地震易损性,得到预测结构倒塌概率的数学模型。基于SAP2000,分析了7度、8度设防烈度区共6种混凝土框架结构模型在13条地震动记录下的地震非线性时程分析,得到不同设防烈度区内的多条地震易损性曲线,对IDA曲线回归分析得到极限状态下的失效概率公式和抗倒塌储备系数。结果表明:IDA曲线发散性与地震震动强度成正相关,高强钢筋强度与结构IDA曲线的发散性在同一地震动强度内成负相关;同一设防烈度下,结构的抗倒塌储备系数随着钢筋强度的增加而增大,结构的倒塌概率越小。
In order to study the seismic vulnerability of concrete frame structures with different high-strength steel bars under earthquake, get a mathematical model for predicting the collapse probability of structures. Based on SAP 2000, writers analyzed the seismic non-linear time-history analysis of 6 kinds of concrete frame structure models in 7-degree and 8-degree fortification intensity zones under 13 seismic records and obtained several seismic vulnerability curves in different fortification intensity regions. The failure probability formula and collapse resistance reserve coefficient under limit state are generate by regression analysis of IDA curve. The results show that the divergence of IDA curve is positively correlated with seismic vibration intensity, and the divergence of IDA curve is negatively correlated with the strength of high-strength steel bar in the same earthquake intensity. Under the same fortification intensity, the reserve coefficient of collapse resistance of the structure increases with the increase of the strength of steel bar, and the collapse probability of the structure decreases.
In order to study the seismic vulnerability of concrete frame structures with different high-strength steel bars under earthquake, get a mathematical model for predicting the collapse probability of structures. Based on SAP 2000, writers analyzed the seismic non-linear time-history analysis of 6 kinds of concrete frame structure models in 7-degree and 8-degree fortification intensity zones under 13 seismic records and obtained several seismic vulnerability curves in different fortification intensity regions. The failure probability formula and collapse resistance reserve coefficient under limit state are generate by regression analysis of IDA curve. The results show that the divergence of IDA curve is positively correlated with seismic vibration intensity, and the divergence of IDA curve is negatively correlated with the strength of high-strength steel bar in the same earthquake intensity. Under the same fortification intensity, the reserve coefficient of collapse resistance of the structure increases with the increase of the strength of steel bar, and the collapse probability of the structure decreases.
引文
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[2] Federal Emergency Management Agency.Recommended seismic design criteria for new steel moment-frame buildings[R].Report No.FEMA 350.SAC Joint Venture,Washington DC:Federal Emergency Management Agency,2000:A-16.
[3] 马千里,叶列平,陆新征,等.采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究[J].建筑结构学报,2008,29(2):132-140.MA Qianli,YE Liping,LU Xinzheng,et al.Study on lateral force mode of RC frame structure nappe analysis by step-by-step incremental elastic-plastic time history method [J].Journal of Architectural Structure,2008,29 (2):132-140.(in Chinese)
[4] 周颖,吕西林,卜一.增量动力分析法在高层混合结构性能评估中的应用[J].同济大学学报:自然科学版,2010,38(2):83-87.ZHOU Ying,LV Xilin,BU Yi.Application of incremental dynamic analysis in performance evaluation of high-rise hybrid structures [J].Journal of Tongji University:Natural Science Edition,2010,38 (2):83-87.(in Chinese)
[5] 汪梦甫,曹秀娟,孙文林.增量动力分析方法的改进及其在高层混合结构地震危害性评估中的应用[J].工程抗震与加固改造,2010,32(1):104-109.WANG Mengfu,CAO Xiujuan,SUN Wenlin.Improvement of incremental dynamic analysis method and its application in seismic hazard assessment of high-rise hybrid structures [J].Seismic Resistance and Reinforcement of Engineering,2010,32 (1):104-109.(in Chinese)
[6] 张健,潘文,宋志刚,等.基于烈度差的城市建筑地震易损性评估[J].地震工程与工程振动,2017,37(4):77-84.ZHANG Jian,PAN Wen,SONG Zhigang,et al.Seismic vulnerability assessment of urban buildings based on poor intensity [J].Earthquake Engineering and Engineering Dynamics,2017,37 (4):77-84.(in Chinese)
[7] 周奎,林杰,祝文.基于增量动力分析(IDA)方法的地震易损性工程实例分析[J].地震工程与工程振动,2016,36(1):135-140.ZHOU Kui,LIN Jie,ZHU Wen.Case study of seismic vulnerability engineering based on incremental dynamic analysis (IDA) [J].Earthquake Engineering and Engineering Dynamics,2016,36 (1):135-140.(in Chinese)
[8] 吕大刚,李晓鹏,王光远.基于可靠度和性能的结构整体地震易损性分析[J].自然灾害学报,2006,15(2):107-114.LV Dagang,LI Xiaopeng,WANG Guangyuan.Analysis of overall seismic vulnerability of structures based on reliability and performance [J].Journal of Natural Disasters,2006,15(2):107-114.(in Chinese)
[9] ATC-63,Quantification of building seismic performance factors[R].ATC-63 Project Report (90% Draft),FEMA P695/April 2008.
[10] Federal Emergency Management Agency (FEMA).Moment-Frame Buildings[S].SAC Joint Venture Washington D C;FEMA 356,2000.
[11] GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2016.GB50011-2010 Code for Seismic Design of Buildings [S].Beijing:China Construction Industry Press,2016.(in Chinese)
[12] 张建伟,夏冬瑞,乔崎云,等.HRB600级钢筋高强混凝土柱的轴心受压性能[J].工业建筑,2017,47(11):77-83.ZHANG Jianwei,XIA Dongrui,QIAO Qiyun,et al.Axial compression behavior of HRB600 reinforced high strength concrete columns [J].Industrial Building,2017,47 (11):77-83.(in Chinese)
[13] Mander J B,Priestley M J N,Park R.Observed stress strain behavior of confined concrete[J].Journal of Structural Engineering,1988,114(8),1827-1849.
[14] Lueo N,Mai P M,Cornell C A.Probabilistic seismic demand analysis at a near-fault site using ground motion simulations based on a stoehastie-kinetie earthquake source model[C]//In:7th US National Conefreneeon Earthqukae Engineering.Boston,2002,l-10.
[15] 王亚勇,高孟潭.基于大震和特大震下倒塌率目标的建筑抗震设计方法研究方案[C]//第八届全国地震工程学术会议论文集,重庆,2010:291-297.WANG Yayong,GAO Mengtan.Research program of building seismic design method based on the target of collapse rate under large earthquakes and extreme earthquakes[C]//Papers Collection of the Eighth National Seismic Engineering Academic Conference,Chongqing,2010:291-297.(in Chinese)