基于功能的混凝土重力坝地震破坏评价模型
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摘要
为了定量反映混凝土重力坝地震破坏程度,进行基于功能的重力坝抗震设计,建立了一种地震破坏评价模型。基于线弹性模型,分析了混凝土重力坝在地震作用下的需求能力比、超应力累积持时,并在弹塑性损伤力学的基础上分析了损伤区长度、位置及损伤因子,建立了重力坝地震破坏评价模型。通过印度K oyna重力坝典型地震破坏事例分析,模型计算的损伤指标(DM)值均大于0.6,属于严重损伤破坏,验证了该模型的合理性。因此,该模型可以定量评估重力坝震后的破坏状态。
Performance-based seismic design of concrete gravity dams requires a seismic damage assessment model which can quantitatively describe the damage degree of dams during strong earthquakes.A linear finite element analysis was used to calculate the damage response of dams to earthquakes as demand-capacity ratios and cumulative overstress durations.The damage index,ratios,and damage zone positions were also studied using a plastic-damage model.The results were used to develop a seismic damage assessment model for concrete gravity dams.All values of the calculated damage measure(DM) were more than 0.6.The accuracy of the model's seismically induced damage assessment was verified by the case of Koyna dam in India.The model can quantitatively evaluate the damage degree of gravity dams during strong earthquakes.
Performance-based seismic design of concrete gravity dams requires a seismic damage assessment model which can quantitatively describe the damage degree of dams during strong earthquakes.A linear finite element analysis was used to calculate the damage response of dams to earthquakes as demand-capacity ratios and cumulative overstress durations.The damage index,ratios,and damage zone positions were also studied using a plastic-damage model.The results were used to develop a seismic damage assessment model for concrete gravity dams.All values of the calculated damage measure(DM) were more than 0.6.The accuracy of the model's seismically induced damage assessment was verified by the case of Koyna dam in India.The model can quantitatively evaluate the damage degree of gravity dams during strong earthquakes.
引文
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[5]张楚汉,金峰,沈怀至,等.基于功能的高坝抗震安全与风险评价[C]∥曹楚生.新世纪水利工程科技前沿.天津:天津大学出版社,2004.ZHANG Chuhan,JIN Feng,SHEN Huaizhi,et al.Performance based seismic safety and risk evaluation of highdams[C]∥CAO Chusheng.Frontiers of New CenturyHydraulic Engineering.Tianjin:Tianjin University Press,2004.(in Chinese)
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[7]Yamaguchi Y,Hall R,Maekawa K,et al.Seismicperformance evaluation of concrete gravity dams[C]//13thWorld Conf on Earthquake Eng,Canada,2004:1068.
[8]Lee J,Fenves G L.Plastic-damage model for cyclic loadingof concrete structures[J].Eng Mech,1998,124(8):892-900.
[9]Lee J,Fenves G L.A plastic-damage concrete model forearthquake analysis of dams[J].Earthquake Eng and StrucDyna,1998,127:937-956.
[2]SHEN Chonggang,CHEN Houqun,ZHANG Chuhan,et al.Earthquakes induced by reservoir impounding and their effecton Hsingfengkiang dam[J].Scientia Sinica,1974,17(2).
[3]Ghanaat Y.Failure modes approach to safety evaluation ofdams[C]//13th World Conf on Earthquake Eng.Canada,2004:1115.
[4]SASAKI Takashi,KANENAWA Kenichi,YAMAGUCHIYoshikazu.Simple estimating method of damages of concretegravity dam based on linear dynamic analysis[C]//13thWorld Conf on Earthquake Eng.Canada,2004:128.
[5]张楚汉,金峰,沈怀至,等.基于功能的高坝抗震安全与风险评价[C]∥曹楚生.新世纪水利工程科技前沿.天津:天津大学出版社,2004.ZHANG Chuhan,JIN Feng,SHEN Huaizhi,et al.Performance based seismic safety and risk evaluation of highdams[C]∥CAO Chusheng.Frontiers of New CenturyHydraulic Engineering.Tianjin:Tianjin University Press,2004.(in Chinese)
[6]Raphael J M.The tensile strength of concrete[J].ACI JProc,1984,81(17):158-165.
[7]Yamaguchi Y,Hall R,Maekawa K,et al.Seismicperformance evaluation of concrete gravity dams[C]//13thWorld Conf on Earthquake Eng,Canada,2004:1068.
[8]Lee J,Fenves G L.Plastic-damage model for cyclic loadingof concrete structures[J].Eng Mech,1998,124(8):892-900.
[9]Lee J,Fenves G L.A plastic-damage concrete model forearthquake analysis of dams[J].Earthquake Eng and StrucDyna,1998,127:937-956.
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