基于等效一致黏弹性边界的重力坝抗震分析

发布时间：2018-04-22 06:23

本文选题：等效三维一致黏弹性边界 + 无质量地基　；参考：《中国科技论文》2017年19期

【摘要】：在结构-地基的抗震动力分析中,有限元法通常是通过对模型施加弹簧-阻尼器或者无质量地基的方法来模拟地震的辐射阻尼效应,其工作量较大。在ADINA程序中采用等效三维一致黏弹性边界单元对三维黏弹性人工边界进行模拟,建立三维有限元模型,在模型的边界上延伸一层实体单元,利用黏弹性边界的弹簧-阻尼器的系数公式推导出边界单元的弹性模量和阻尼系数,并赋值给边界材料参数。利用地震响应时程分析法,对带有等效一致黏弹性边界的重力坝模型计算得出的结果与以无质量地基的方法来阻止地震波在边界反射的计算结果相比较,得出使用等效三维一致黏弹性边界来模拟地震辐射阻尼的抗震性能更好,可大大减少建模工作量,为复杂结构进行抗震分析提供了新的方法。
[Abstract]:In the seismic dynamic analysis of structure-foundation, the finite element method (FEM) is usually used to simulate the radiation damping effect of earthquake by applying spring damper or massless foundation to the model. The three-dimensional viscoelastic artificial boundary is simulated by using the equivalent three-dimensional uniform viscoelastic boundary element in ADINA program. The three-dimensional finite element model is established and a layer of solid element is extended on the boundary of the model. The elastic modulus and damping coefficient of the boundary element are derived by using the coefficient formula of the spring-damper of the viscoelastic boundary, and the parameters of the boundary material are assigned. By using the time-history analysis method of seismic response, the results of gravity dam model with an equivalent uniformly viscoelastic boundary are compared with the results obtained by using the massless foundation method to prevent seismic waves from reflecting at the boundary. It is concluded that the equivalent three-dimensional uniform viscoelastic boundary can be used to simulate the seismic performance of seismic radiation damping, which can greatly reduce the workload of modeling and provide a new method for seismic analysis of complex structures.
【作者单位】：上海海事大学经济管理学院;上海海事大学海洋科学与工程学院;
【基金】：国家自然科学基金资助项目(51078228) 上海市研究生教育创新计划实施项目(20131129)
【分类号】：TV312;TV642.3

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