基于能量分析强震持时指标的选择
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摘要
基于能量结构地震弹塑性分析过程中,地震记录的强震持时是影响结构能量需求的重要指标。利用拟合设计反应谱的人工地震记录、对实际记录进行调整后与设计谱相匹配的地震记录以及实际地震记录,对不同滞回模型和不同自振周期的弹塑性单自由度结构体系以及按现行规范设计的12层钢筋混凝土框架结构进行弹塑性时程分析。通过分析5种不同类型的强震持时指标与结构总输入能、滞回耗能、阻尼耗能以及构件耗能之间的相关性,得到了与结构能量响应相关性较高的强震持时指标。结果表明,一致持时指标与各能量项之间的相关性较高,因此,进行能量分析时可选择一致持时作为参考指标。
Strong motion duration of earthquake records is an important factor affecting the energy demand of the structure in the energy elastic-plastic analysis.Artificial records,spectral matched records by scaling and adjusting the real accelerograms and real strong motion records are used to analyze single-degree-of-freedom structures with different hysteretic model and vibration period,and inelastic time history analysis based on energy response for a 12-story reinforced concrete moment frame designed according to the present code is also conducted using these records.Through correlation calculation among five types of strong motion duration indices and structural input energy,hysteretic energy,damping energy and components energy,the strong motion duration index which has higher correlation with structural energy demand is found.The results show that the uniform duration has higher correlation than other indexs.Accordingly,the uniform duration can be selected as the reference index when energy analysis will be carried out.
Strong motion duration of earthquake records is an important factor affecting the energy demand of the structure in the energy elastic-plastic analysis.Artificial records,spectral matched records by scaling and adjusting the real accelerograms and real strong motion records are used to analyze single-degree-of-freedom structures with different hysteretic model and vibration period,and inelastic time history analysis based on energy response for a 12-story reinforced concrete moment frame designed according to the present code is also conducted using these records.Through correlation calculation among five types of strong motion duration indices and structural input energy,hysteretic energy,damping energy and components energy,the strong motion duration index which has higher correlation with structural energy demand is found.The results show that the uniform duration has higher correlation than other indexs.Accordingly,the uniform duration can be selected as the reference index when energy analysis will be carried out.
引文
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[16]叶献国,徐勤,李康宁,种迅.地震中受损钢筋混凝土建筑弹塑性时程分析与振动台试验研究[J].土木工程学报,2003,36(12):20～25Ye Xian-guo,Xu Qin,Li Kang-ning,Chong Xun.Experimental Research on Inelastic Time-historyAnalysis and Shaking Table Test for a ReinforcedConcrete Building Damaged in Earthquake[J].ChinaCivil Engineering Journal,2003,36(12):20～25(in Chinese)
[17]李康宁,洪亮,叶献国.结构三维弹塑性分析方法及其在建筑物震害研究中的应用[J].建筑结构,2001,31(3):53～61Li Kang-ning,Hong Liang,Ye Xian-guo.NonlinearAnalysis of 3D Models and Application in Research of aBuilding Damaged in Earthquake[J].BuildingStructure,2001,31(3):53～61(in Chinese)
[2]Uang C M and Bertero V V.Evaluation of seismicenergy in structures[J].Earthquake Engineering and Structural Dynamics,1990,19:77～90
[3]Surahman A.Earthquake-resistant structural designthrough energy demand and capacity[J].EarthquakeEngineering and Structural Dynamics,2007,36:2099～2117
[4]尹保江,黄宗明,白绍良.对地震地面运动持续时间定义的对比分析及改进建议[J].工程抗震,1999,2:43～46Yin Bao-jiang,Huang Zong-ming,Bai Shao-liang.Comparison Analysis and Suggestion of Definition ofEarthquake Duration[J].Earthquake ResistantEngineering,1999,2:43～46(in Chinese)
[5]Bommer J J,Martinez-Pereira A.The effective durationof earthquake strong motion[J].Journal of EarthquakeEngineering,1999,3(2):127～172
[6]Bommer J J,Magenes G,Hancock J,Penazzo P.Theinfluence of strong motion duration on the seismicresponse of masonry structures[J].Bulletin ofEarthquake Engineering,2004,2(1):1～24
[7]杜修力,刘勇生.强震持时对钢筋混凝土结构地震累积破坏的影响[J].地震工程与工程振动,1992,12(3):65～70Du Xiu-li,Liu Yong-sheng.Influence of Strong MotionDuration on Accumulated Seismic Damage of RCStructures[J].Earthquake Engineering and EngineeringViberation,1992,12(3):65～70(in Chinese)
[8]Iunio Iervolino,Gaetano Manfredi,Edoardo Cosenza.Ground motion duration effects on nonlinear seismicresponse[J].Earthquake Engineering and StructuralDynamics,2006,35:21～38
[9]Jonathan Hancock,Julian J Bommer.Using spectralmatched records to explore the influence of strong-motionduration on inelastic structural response[J].SoilDynamics and Earthquake Engineering,2007,27:291～299
[10]Stafford P J,Mendis R and Bommer J J.Dependence ofDamping Correction Factors for Response Spectra onDuration and Numbers of Cycles[J].Journal ofStructural Engineering,2008,134(8):1364～1373
[11]Chai Y H,Fajfar P.A procedure for estimating inputenergy spectra for seismic design[J].Journal ofEarthquake Engineering,2000,4(4):539～561
[12]Manfredi G.Evaluation of seismic energy demand[J].Earthquake Engineering and Structural Dynamics,2001,30:485～499
[13]Abrahamson N A.Non-Stationary Spectral Matching Program RSPMATCH[R].Pacific Gas&ElectricInternal Report,University of California,Los Angeles.1998
[14]Lilhanand K,Tseng W S.Development and applicationof realistic earthquake time histories compatible withmultiple damping design spectra[A].Proceedings of the9th WCEE[C].Tokyo-Kyoto,Japan,1988.II:819～824
[15]王亚勇.关于设计反应谱、时程法和能量方法的探讨[J].建筑结构学报,2000,21(1):21～28Wang Ya-yong.A Review of Seismic Response Spectra,Time History Analysis and Energy Method[J].Journalof Building Structures,2000,21(1):21～28(in Chinese)
[16]叶献国,徐勤,李康宁,种迅.地震中受损钢筋混凝土建筑弹塑性时程分析与振动台试验研究[J].土木工程学报,2003,36(12):20～25Ye Xian-guo,Xu Qin,Li Kang-ning,Chong Xun.Experimental Research on Inelastic Time-historyAnalysis and Shaking Table Test for a ReinforcedConcrete Building Damaged in Earthquake[J].ChinaCivil Engineering Journal,2003,36(12):20～25(in Chinese)
[17]李康宁,洪亮,叶献国.结构三维弹塑性分析方法及其在建筑物震害研究中的应用[J].建筑结构,2001,31(3):53～61Li Kang-ning,Hong Liang,Ye Xian-guo.NonlinearAnalysis of 3D Models and Application in Research of aBuilding Damaged in Earthquake[J].BuildingStructure,2001,31(3):53～61(in Chinese)
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