地震动参数对高层混合结构破坏的影响
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摘要
采用15条地震波对3个层高不同周期不同的钢框架-钢筋混凝土剪力墙混合结构进行动力时程分析,以了解地震波的峰值速度与峰值加速度的比值、峰值加速度、以及强震持时对结构破损程度的影响.结果表明:地震波的幅值相同时,结构的破坏程度与地震波峰值速度与峰值加速度的比值呈正比;地震波峰值加速度的增大使结构破坏程度不断提高,提高的速度先急后缓;地震波强震持时对结构破坏的影响随结构自振周期增大而增大.根据研究结果提出了结构破损计算公式,该公式综合反映了地震波幅值、频谱特性对不同周期结构破坏的影响,利用它能较为准确地判断地震波对结构的破坏能力.
Three steel frame-reinforced concrete tube structures with different stories and different structural periods were analyzed,using 15 ground motion records,in order to obtain the sensitivity of the seismic damage of structures to the ratio of peak ground velocity to acceleration(V/A),peak ground acceleration(A) and effective duration(Δt)of ground motion records.It was found that the damage increased with the increase of peak ground velocity to acceleration ratio for the same peak ground acceleration.The damage increased but the increased ratio decreased with the peak ground acceleration,and the effective duration had more influence on the structure of long period.Based on the conclusions,a new damage index describing the effects of V/A and A on hybrid structures of different periods was proposed,which provided a preferable estimation of measuring the damage potential of earthquake ground motion records.
Three steel frame-reinforced concrete tube structures with different stories and different structural periods were analyzed,using 15 ground motion records,in order to obtain the sensitivity of the seismic damage of structures to the ratio of peak ground velocity to acceleration(V/A),peak ground acceleration(A) and effective duration(Δt)of ground motion records.It was found that the damage increased with the increase of peak ground velocity to acceleration ratio for the same peak ground acceleration.The damage increased but the increased ratio decreased with the peak ground acceleration,and the effective duration had more influence on the structure of long period.Based on the conclusions,a new damage index describing the effects of V/A and A on hybrid structures of different periods was proposed,which provided a preferable estimation of measuring the damage potential of earthquake ground motion records.
引文
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[2]周云,徐彤,周福霖.抗震与减震结构的能量分析方法研究与应用[J].地震工程与工程震动,1999,19(4):133-139.ZHOU Y,XU T,ZHOU F L.Research and development ofstructural seismic design based on energy method[J].EarthquakeEngineering&Engineering Vibration,1999,19(4):133-139.(In Chinese)
[3]麋永红,汪梦甫.阻尼对结构能量反应的影响研究[J].湖南大学学报:自然科学版,2003,30(3):148-149.MI Y H,WANG M F.The effects of damping models to energyresponse of structures[J].Journal of Hunan University:NaturalSciences,2003,30(3):148-149.(In Chinese)
[4]李国强,周向明,丁翔.高层建筑钢-混凝土混合结构模型模拟地震振动台试验研究[J].建筑结构学报,2001,22(2):2-7.LI G Q,ZHOU X M,DING X.Shaking table study on a modelof steel-concrete hybrid structure tall buildings[J].Journal ofBuilding Structures,2001,22(2):2-7.(In Chinese)
[5]SHAHROOZ B M,GONG B N,TUNC G,et al.An overview ofreinforced concrete core wall-steel frame hybrid structures[J].Progress in Structural Engineering and Materials,2001,3(2):149-158.
[6]SUCUOGLU H,NURTUG A.Earthquake ground motion char-acteristics and seismic energy dissipation[J].Earthquake Engi-neering&Structural Dynamics,1995,24(9):1195-1213.
[7]KUNNATH S K,REINHORN A M,LOBO R F.IDARC version3.0:A program for the inelastic damage analysis of reinforcedconcrete structures.report No.NCEER-90-0022[R].NewYork:National Center for Earthquake Engineering Research,State University of New York at Buffalo,1992.
[8]GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB 50011-2001 Code for seismic design of buildings[S].Bei-jing:China Architecture and Building Press,2001.(In Chinese)
[9]李国强,周向明,丁翔.钢筋混凝土剪力墙非线性动力分析模型[J].世界地震工程,2000,16(2):13-18.LI G Q,ZHOU X M,DING X.Models of reinforced concreteshear walls for nonlinear analysis[J].World Information onEarthquake Engineering,2000,16(2):13-18.(In Chinese)
[10]李国强,周昊圣,周向明.高层钢-混凝土混合结构弹塑性地震位移的工程实用计算[J].建筑结构学报,2003,24(1):40-45.LI G Q,ZHOU H S,ZHOU X M.A practical approach for esti-mating elastoplastic seismic displacements of tall steel-concretemixed buildings[J].Journal of Building Structures,2003,24(1):40-45.(In Chinese)
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