混凝土高坝-地基体系的地震损伤分析
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摘要
在研究混凝土高坝的地震损伤过程中,采用基于由材料试验结果直接建立计入残余应变影响的混凝土损伤力学模型的新思路,可以避免使用目前常用的并不适用于混凝土的塑性损伤模型,从而使计算流程大为简化,计算结果更为合理。鉴于地基岩体对混凝土高坝地震损伤的影响不容忽视,本文在已有研究基础上,对计入弹性地基及其辐射阻尼的坝体-地基体系进行了地震损伤的初步分析,并与刚性地基的分析结果进行比较,结果表明,考虑地基岩体的损伤特性后结果更加合理。
To prevent seismic catastrophe the damage process of high concrete dam during strong earthquake has to be studied. A new conception of setting up seismic damage model with considering residual deformation dam based directly on material experimental data without plastic-damage coupling has been provided. The suggested approach seems more reasonable and simplified. However, the effect of foundation rock on the seismic damage of high concrete dam should not be neglected. On the basis of proposed approach a preliminary seismic damage analysis for high concrete dam system including elastic near-foundation rock mass and radiation damping of far-foundation was introduced in this paper. For validating the seismic damage phenomenon of the Koyna Dam, the analytical results compared between the rigid foundation model and the model of dam-foundation system reveal that to explore the seismic damage process of high concrete dam-foundation system the consideration of damage properties of rock foundation is necessary and a further investigation on preventing seismic catastrophe is now being guided.
To prevent seismic catastrophe the damage process of high concrete dam during strong earthquake has to be studied. A new conception of setting up seismic damage model with considering residual deformation dam based directly on material experimental data without plastic-damage coupling has been provided. The suggested approach seems more reasonable and simplified. However, the effect of foundation rock on the seismic damage of high concrete dam should not be neglected. On the basis of proposed approach a preliminary seismic damage analysis for high concrete dam system including elastic near-foundation rock mass and radiation damping of far-foundation was introduced in this paper. For validating the seismic damage phenomenon of the Koyna Dam, the analytical results compared between the rigid foundation model and the model of dam-foundation system reveal that to explore the seismic damage process of high concrete dam-foundation system the consideration of damage properties of rock foundation is necessary and a further investigation on preventing seismic catastrophe is now being guided.
引文
[1]Lubliner J,Oliver J,Oller S,et al.A Plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299-326.
[2]Lee Jeeho,Gregory L Fenves.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engi neering Mechanics,1998,124(3):892-900.
[3]ABAQUS THEORY MANUAL[Z].ABAQUS,INC,2009.
[4]Lee Jeeho,Gregory L Fenves.A plastic-damage concrete model for earthquake analysis of dams[J].Journal of Earthquake Engineering And Structural Dynamics,1998,27:937-956.
[5]陈厚群,郭胜山.地震作用下混凝土高坝损伤模型的探讨[C]//第四届全国结构振动与动力学学术研讨会议论文集.2011:14-16.
[2]Lee Jeeho,Gregory L Fenves.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engi neering Mechanics,1998,124(3):892-900.
[3]ABAQUS THEORY MANUAL[Z].ABAQUS,INC,2009.
[4]Lee Jeeho,Gregory L Fenves.A plastic-damage concrete model for earthquake analysis of dams[J].Journal of Earthquake Engineering And Structural Dynamics,1998,27:937-956.
[5]陈厚群,郭胜山.地震作用下混凝土高坝损伤模型的探讨[C]//第四届全国结构振动与动力学学术研讨会议论文集.2011:14-16.
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