混凝土重力坝抗震破坏等级及安全评价方法
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摘要
为有效地评价混凝土重力坝的抗震性能,考虑迎水面破坏、不同裂缝倾入坝体的程度、灌浆帷幕破坏程度和损伤区域的位置对重力坝整体结构的影响,基于混凝土塑性损伤力学本构模型定义大坝整体损伤指标,并以整体损伤指标划分重力坝地震破坏等级,建立混凝土重力坝抗震破坏评价模型。采用该方法对某混凝土重力坝的抗震安全进行评价,得到强震作用下大坝的破坏模式及抗震性能,结果表明该大坝在设计地震下发生的破坏为可修复性破坏,在校核地震下会发生严重破坏,坝头可能会发生断裂,建议强震发生时及时降低库水位以确保下游安全。
In order to evaluate the earthquake resistant behavior of concrete gravity dam effectively,nonlinear seismic analysis of a concrete gravity dam is performed based on the plastic damage constitutive model.Based on the seismic safety of structural performance,a seismic damage assessment model considering the influence of the damage of the upper part,the crack length and the damage of curtain grouting on dam safety was developed for describing the damage of the concrete gravity dam.Based on this approach,the seismic safety of a certain concrete gravity dam has been evaluated.In addition,possible failure modes and seismic performance of the dam are obtained under the action of strong earthquake.The results show that the dam damage is repaired at the design operating condition while it will damage severely in the check earthquake and the abutment may be fractured.Therefore,it suggests that the water level of reservoir should be fallen to ensure the lower reaches safety when the strong earthquake appears.
In order to evaluate the earthquake resistant behavior of concrete gravity dam effectively,nonlinear seismic analysis of a concrete gravity dam is performed based on the plastic damage constitutive model.Based on the seismic safety of structural performance,a seismic damage assessment model considering the influence of the damage of the upper part,the crack length and the damage of curtain grouting on dam safety was developed for describing the damage of the concrete gravity dam.Based on this approach,the seismic safety of a certain concrete gravity dam has been evaluated.In addition,possible failure modes and seismic performance of the dam are obtained under the action of strong earthquake.The results show that the dam damage is repaired at the design operating condition while it will damage severely in the check earthquake and the abutment may be fractured.Therefore,it suggests that the water level of reservoir should be fallen to ensure the lower reaches safety when the strong earthquake appears.
引文
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[6]范书立,陈明阳,陈健云,等.基于能量耗散碾压混凝土重力坝地震损伤分析[J].振动与冲击,2011,30(4):271-275.
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[8]Lee J,Fenves L G.Plastic-damage Model for CyclicLoading of Concrete Structures[J].Journal of Engi-neering Mechanics,1998,124(8):892-900.
[9]李晓燕,钟红,林皋.地震作用下混凝土坝破坏过程与破坏形态数值仿真[J].水利学报,2011,42(10):1 209-1 216.
[10]甘磊,沈振中,凌春海,等.马堵山重力坝动力响应分析及安全评价[J].水电能源科学,2010,28(7):78-81.
[2]Park Y J,Ang H S.Mechanistic Seismic Damage Modelfor Reinforced Concrete[J].Journal of Structural Engi-neering,1985,111(4):722-739.
[3]Ghanaat Y.Failure Modes Approach to Safety Evalua-tion of Dams[A].13th World Conference on Earth-quake Engineering[C].Vancouver,Canada:2004.
[4]沈怀志,张楚汉,寇立夯.基于功能的混凝土重力坝地震破坏评价模型[J].清华大学学报(自然科学版),2007,47(12),2114-2118.
[5]寇立夯,金峰,张楚汉,等.重力坝地震整体损伤指数的初步探索[J].中国水利,2008(11):28-30.
[6]范书立,陈明阳,陈健云,等.基于能量耗散碾压混凝土重力坝地震损伤分析[J].振动与冲击,2011,30(4):271-275.
[7]ABAQUS,Inc.ABAQUS/Standard User’s Manual(Version 6.10)[M].Hibbit Karlsson and SorensenInc.,2010.
[8]Lee J,Fenves L G.Plastic-damage Model for CyclicLoading of Concrete Structures[J].Journal of Engi-neering Mechanics,1998,124(8):892-900.
[9]李晓燕,钟红,林皋.地震作用下混凝土坝破坏过程与破坏形态数值仿真[J].水利学报,2011,42(10):1 209-1 216.
[10]甘磊,沈振中,凌春海,等.马堵山重力坝动力响应分析及安全评价[J].水电能源科学,2010,28(7):78-81.
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