【摘要】 阻尼溶剂抽取法通过虚加人工高阻尼再移频抽取的方式考虑无限地基辐射阻尼影响,可有效模拟非均质无限域的动力特性,且能实现时频变换的完全解耦,故推进该方法的工程应用具有实用价值。该文基于ANSYS平台,以UPFs为二次开发工具,在通用有限元软件中嵌入了阻尼溶剂抽取法的时域地基模型。推导了一种交界面空间耦联单元,用于考虑在结构侧交界面迭加地基高阻尼的影响,并建立Fortran外部接口进行交界面相互作用力的求解,从而形成动力求解的整体系统。最后,通过数值算例验证了计算模型的可靠性和良好的适用性,进而结合通用有限元软件丰富的结构单元模型及非线性分析能力,可开展各类复杂结构的动力相互作用分析。更多还原

【Abstract】 The Damping Solvent Extraction Method(DSEM),which considers the radiation damping by introducing artificial high damping to attenuate wave motion and then extracting its influence through shifting the frequency axis,can simulate the dynamic properties of inhomogeneous infinite medium and make the coupling of a time-frequency domain eliminated,so the research on generalizing the method to engineering application has practical value.A time-domain model based on User Programmable Features(UPFs) for implementing the DSEM within commercial finite element software ANSYS is presented.The structure and unbounded foundation are modeled as two separate substructures,and a coupling element is formulated for considering the effect of high damping on the structure and a practical external-interface is developed with ANSYS for evaluating interaction forces on the structure-foundation interface.Numerical examples show the reliability and good validity of the presented model.Further more,by taking the advantage of the rich element library and powerful numerical solvers in commercial finite element software,the presented model can be used for solving sophisticated dynamic structure-soil interaction problems.更多还原