改进的Park-Ang地震损伤模型及其比较
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摘要
随着基于性态抗震设计理论的发展,Park-Ang双参数地震损伤模型在建立性态目标量化准则方面受到重视。通过引入与加载路径有关的能量项加权因子iβ,由定义的临界延性系数μ0和能量等效系数γE计算,提出了改进的Park-Ang双参数地震损伤模型。基于钢筋混凝土桥墩拟静力试验数据和非线性地震反应分析结果对改进模型进行了验证,并与原Park-Ang模型进行了比较分析,初步获得如下认识:①在选择合适组合参数β的条件下,改进Park-Ang模型和原模型在整体上都可以较好地描述构件的破损过程;②改进Park-Ang模型与原模型相比,可一定程度地降低组合参数β不确定性对损伤指数计算结果的影响。
More recently particular attention is paid to the cumulative seismic damage model proposed by Park and Ang with the development of performance based seismic design,because it can be used to numerically compute different structural damage during an earthquake and to define the performance design objectives.By multiplying another energy weighted coefficient which is related to load path and can be calculated by critical ductility factor and equivalent energy factor, the modified Park-Ang seismic damage model is obtained.Cyclic loading test and nonlinear seismic analysis results of reinforced concrete bridge piers show that:(1) the modified Park-Ang damage model and Park-Ang model can provide a good measure of damage at different limit states if a proper non-negative parameter β is used.(2)the damage calculated by modified Park-Ang damage model is not much sensitive to the non-negative parameter β than that by the Park-Ang damage model.
More recently particular attention is paid to the cumulative seismic damage model proposed by Park and Ang with the development of performance based seismic design,because it can be used to numerically compute different structural damage during an earthquake and to define the performance design objectives.By multiplying another energy weighted coefficient which is related to load path and can be calculated by critical ductility factor and equivalent energy factor, the modified Park-Ang seismic damage model is obtained.Cyclic loading test and nonlinear seismic analysis results of reinforced concrete bridge piers show that:(1) the modified Park-Ang damage model and Park-Ang model can provide a good measure of damage at different limit states if a proper non-negative parameter β is used.(2)the damage calculated by modified Park-Ang damage model is not much sensitive to the non-negative parameter β than that by the Park-Ang damage model.
引文
[1]Park Y J,Ang H S.Mechanistic Seismic Damage Model forReinforced Concrete[J].Journal of Structure Engineering,ASCE,1985,111(4):722~739.
[2]Bertero R D,Bertero V V.Performance-based SeismicEngineering:the Need for Reliable ConceptualComprehensive Approach[J].Earthquake Eng.Stru.Dyn.2002,31:627~652.
[3]欧进萍,何政,吴斌,等.钢筋混凝土结构的地震损伤控制设计[J].建筑结构学报,2000,21(1):63~70.
[4]刘伯权,白绍良,徐云中,等.钢筋混凝土柱低周疲劳性能的试验研究[J].地震工程与工程振动,1998,18(4):82~89.
[5]Kunnath S K.Cumulative Seismic Damage of ReinforcedConcrete Bridge Piers[R].University at Buffalo,StateUniversity of New York,NCEER Report:97-0006.
[6]Park S W,Wen W P,Cooper J D,et al.A ComparativeStudy of US-Japan Seismic Design of Highway Bridges:Ⅱ.Shake Table Model Tests[J].Earthquake Spectra,2003,19(4):933~958.
[7]王东升,冯启民,王国新.考虑低周疲劳寿命的改进Park-Ang地震损伤模型[J].土木工程学报,2004,37(11):41~49.
[8]Chai Y H,Romstad K M.Correlation between Strain-BasedLow-Circle Fatigue and Energy-based Linear Damage Models[J].Earthquake Spectra,1997,13(2):191~208.
[9]Valles R E,Reinhorn A M,Kunnath S K,et al.IDARC2DVersion 4.0:A Computer Program for the Inelastic DamageAnalysis of Buildings[R].University at Buffalo,StateUniversity of New York,NCEER Report:96-0010.
[2]Bertero R D,Bertero V V.Performance-based SeismicEngineering:the Need for Reliable ConceptualComprehensive Approach[J].Earthquake Eng.Stru.Dyn.2002,31:627~652.
[3]欧进萍,何政,吴斌,等.钢筋混凝土结构的地震损伤控制设计[J].建筑结构学报,2000,21(1):63~70.
[4]刘伯权,白绍良,徐云中,等.钢筋混凝土柱低周疲劳性能的试验研究[J].地震工程与工程振动,1998,18(4):82~89.
[5]Kunnath S K.Cumulative Seismic Damage of ReinforcedConcrete Bridge Piers[R].University at Buffalo,StateUniversity of New York,NCEER Report:97-0006.
[6]Park S W,Wen W P,Cooper J D,et al.A ComparativeStudy of US-Japan Seismic Design of Highway Bridges:Ⅱ.Shake Table Model Tests[J].Earthquake Spectra,2003,19(4):933~958.
[7]王东升,冯启民,王国新.考虑低周疲劳寿命的改进Park-Ang地震损伤模型[J].土木工程学报,2004,37(11):41~49.
[8]Chai Y H,Romstad K M.Correlation between Strain-BasedLow-Circle Fatigue and Energy-based Linear Damage Models[J].Earthquake Spectra,1997,13(2):191~208.
[9]Valles R E,Reinhorn A M,Kunnath S K,et al.IDARC2DVersion 4.0:A Computer Program for the Inelastic DamageAnalysis of Buildings[R].University at Buffalo,StateUniversity of New York,NCEER Report:96-0010.
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