不同地震作用方向下混凝土核心筒基于增量动力分析的抗震性能评估
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摘要
强震作用下,核心筒对混合结构发生破坏乃至倒塌有着重要影响。选择合适的地震输入,进行核心筒在双向或多向地震作用下的地震反应分析是值得深入研究的。采用动力时程分析方法,通过不同方向地震作用与单向地震作用下混凝土核心筒的地震效应对比可知,在进行结构设计时,大震作用下,斜向地震作用下的内力要明显偏大,仅考虑单向输入的水平加速度的设计结果会偏于不安全。并通过输入与Y轴45°斜向地震记录基于单条地震记录的增量动力分析方法(IDA方法)对核心筒进行抗震性能评估。结果表明,斜向地震输入对核心筒IDA曲线有一定影响,但各性能点对应的量化位移指标与Y向单条地震输入时相差不大。
The effect of aseismic performance of core walls on damage of a hybrid structure under a strong earthquake is very important.It is worth studying deeply seismic response of a core wall under double-direction or multidirection earthquakes action by choosing appropriate earthquake inputs.The dynamic time history analysis of a core wall was performed.By comparison,it was shown that the structural internal force under oblique directional seismic action is much stronger than that under unidirectional earthquake action and the design results based on unidirectional earthquake input may be unsafe.The aseismic performance of a core wall based on the single-input IDA method was analyzed under an earthquake action in the direction of 45° about the vertical axis.The results indicated that an oblique directional earthquake action has a certain effect on the IDA curves of a core wall;however,the displacement indexes corresponding to different performance levels are close to those under the vertical directional single earthquake action.
The effect of aseismic performance of core walls on damage of a hybrid structure under a strong earthquake is very important.It is worth studying deeply seismic response of a core wall under double-direction or multidirection earthquakes action by choosing appropriate earthquake inputs.The dynamic time history analysis of a core wall was performed.By comparison,it was shown that the structural internal force under oblique directional seismic action is much stronger than that under unidirectional earthquake action and the design results based on unidirectional earthquake input may be unsafe.The aseismic performance of a core wall based on the single-input IDA method was analyzed under an earthquake action in the direction of 45° about the vertical axis.The results indicated that an oblique directional earthquake action has a certain effect on the IDA curves of a core wall;however,the displacement indexes corresponding to different performance levels are close to those under the vertical directional single earthquake action.
引文
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[3]易方民,高小旺,张维嶽,等.高层建筑钢结构在多维地震动输入作用下的反应[J].建筑结构学报,2003,24(3):33-43.YI Fang-min,GAO Xiao-wang,ZHANG Wei-yue,et al.Response of tall-building steel structure to multi-dimensionalseismic action[J].Journal of Building Structures,2003,24(3):33-43.
[4]曹万林,王光远,吴建有,等.不同方向周期反复荷载作用下L形柱的性能[J].地震工程与工程振动,1995,15(1):67-72.CAO Wan-lin,WANG Guang-yuan,WU Jian-you,et al.Behavior of“L”shape column under different directionalcyclic loading[J].Earthquake Engineering and EngineeringVibration,1995,15(1):67-72.
[5]黄选明,张建伟,曹万林,等.钢筋混凝土非工程轴方向受力短肢剪力墙抗震性能试验[J].北京工业大学学报,2010,36(2):172-178.HUANG Xuan-ming,ZHANG Jian-wei,CAO Wan-lin,etal.Seismic performance of short pier RC shear wall withoutengineering axial force[J].Journal of Beijing University oftechnology,2010,36(2):172-178.
[6]管民生,王险峰,杜宏彪,等.框架-剪力墙结构单双向地震输入下的反应分析[J].广东工业大学学报,2010,27(2):17-20.GUAN Min-sheng,WANG Xian-feng,DU Hong-biao,et al.The Seismic response analysis of frame-shear wall structuresunder uni-and bi-directional seismic excitation[J].Journal ofGuangdong University of Technology,2010,27(2):17-20.
[7]Bertero V V.Strength and deformation capacities of buildingsunder extreme environments[M].Prentice-Hall:EnglewoodCliffs,NJ,Structural Engineering and Structural Mechanics,Pister KS(ed.),1977:211-255.
[8]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engng Struct.Dyn.,2002,31(3):491-514.
[9]Vamvatsikos D,Cornell C A.Applied Incremental dynamicanalysis[J].Earthquake Spectra,2004,20(2):523-553.
[10]玉军.钢筋混凝土高层建筑结构抗震弹塑性分析方法的研究及其应用[D].长沙:湖南大学,2007.
[11]王秋维,史庆轩,侯炜,等.型钢混凝土框架结构基于增量动力分析的抗震性能评估[J].世界地震工程,2011,27(1):34-40.WANG Qiu-wei,SHI Qing-xuan,HOU Wei,et al.Seismicperformance evaluation of SRC frame structures based onincremental dynamic analysis[J].World EarthquakeEngineering,2011,27(1):34-40.
[12]Perform Components and Elements,CSI,2006.
[13]史庆轩,侯炜,田园,等.钢筋混凝土核心筒性态水平及性能指标限值研究[J].地震工程与工程振动,2011,31(6):88-95.SHI Qing-xuan,HOU Wei,TIAN Yuan,et al.Study on seismicperformance levels and performance index limit values ofreinforced concrete core wall structure[J].EarthquakeEngineering and Engineering Vibration,2011,31(6):88-95.
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