动力边界模型对土与结构非线性动力系统数值计算影响的分析(英文)

Analysis of Dynamic Boundary Model Effects on Soil-structure Nonlinear Dynamic System Numerical Calculation

对不同参数条件下自由的远置边界、固定的远置边界、简单的远置边界、粘性局部人工边界和粘弹性局部人工边界等动力边界模型对土与结构非线性相互作用数值计算的影响进行了分析,根据实例计算分析了各种动力边界模型的有效性、数值计算量及计算结果的可靠性。分析结果表明:不同的远置边界模型,对地基计算的合理取值范围有重要的影响,而只要地基的计算范围取得合理,都获得可靠的数值计算结果;粘性与粘弹性局部人工边界对数值计算结果虽有一定的影响,但具有足够的可靠性,而且可把地基计算范围取得较小,大大地减小数值计算量,在满足工程设计计算精度要求的基础上有效地节约计算成本。

The effects of various dynamic boundary models, such as free boundary, fix boundary, simple boundary, viscous local artificial boundary and viscous-spring local artificial boundary with different parameters on the numerical calculation of soil-structure nonlinear dynamic interaction system ware analyzed in this paper. The ef- ficiency and resource consumption of various dynamic boundary models and the reliability of numerical results were also discussed. Researches show that different dynamic boundary models have great effect on rational base calculation range; free, fix and simple dynamic boundary model can get same results under their own rational base calculation range ; viscous and viscous-spring local dynamic artificial boundary model may lose some precision, but still have enough reliability, and the smaller base calculation range is allowed without exceeding engineering precision limit, so they can save a lot of computer resource and calculation cost.