基于混凝土率相关损伤模型的重力坝地震动超载响应分析
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摘要
本文通过在损伤张量中引入应变率的影响,提出了应变率相关的混凝土弹塑性损伤模型,用来模拟混凝土材料在动力工况下的力学行为。利用此模型对一重力坝进行了地震动超载响应分析,分别从损伤断裂程度和层面抗滑稳定两个方面对坝体进行了安全评价。结果表明,由于地震荷载引起的应变率在坝面的分布不同,坝面各处的动态性能变化不一致,由此引起的混凝土强度和刚度的变化对坝体的动力响应和安全评价有重要影响。
A new rate-dependent damage constitutive model for simulating the mechanical behaviors of concrete working in seismic condition is established by introducing the effect of strain rate into the damage tensor.The model is applied to analyze the seismic overload response of a typical concrete gravity dam and the safety of the dam is assessed from two aspects including the damaged degree and sliding resistance stability.The result indicates that the distribution of strain rate caused by seismic loading varies at the dam surface and significantly affects the dynamic response as well as the safety evaluation of the dam.
A new rate-dependent damage constitutive model for simulating the mechanical behaviors of concrete working in seismic condition is established by introducing the effect of strain rate into the damage tensor.The model is applied to analyze the seismic overload response of a typical concrete gravity dam and the safety of the dam is assessed from two aspects including the damaged degree and sliding resistance stability.The result indicates that the distribution of strain rate caused by seismic loading varies at the dam surface and significantly affects the dynamic response as well as the safety evaluation of the dam.
引文
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[2]Bazant Z P,Oh B H.Crack bank theory for fracture in concrete[J].Mater.Struct.,1983,16(93):155-177.
[3]Faria R,Oliver J,Cervera M.A strain-based plastic viscous-damage model for massive concrete structure[J].Int.J.Solids Structures,1998,35(14):1553-1558.
[4]高文学,刘运通.岩石动态损伤的数值模拟[J].北京工业大学学报,2000,26(5):5-11.
[5]董毓利,谢和平,赵鹏.不同应变率下混凝土受压全过程的实验研究及其本构模型[J].水利学报,1997,(7):72-77.
[6]蒋昭,陈江瑛.混凝土结构动态安全分析的重要基础———混凝土动态力学性能[J].宁波大学学报,1997,10(2):50-57.
[7]Villiappan S,Yazdchi M.Seismic analysis of arch dams-a continuum damage mechanics approach[J].Int.J.Numer.Mech.Engng.,1999,(45):1685-1724.
[8]江见鲸.钢筋混凝土结构非线性有限元分析[M].西安:陕西科学技术出版社,1994.
[9]李庆斌,张楚汉,王光纶.单轴状态下混凝土的动力损伤本构模型[J].水利学报,1994,(12):55-60.
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