框剪结构土-结构相互作用地震反应分析

An Analysis of Seismic Soil-Structure Interaction Response for Frame-Shear Wall Structure

本文在全面考虑上部结构、基础及下部土体实际情况和受力特性的基础上,开发了一种平面框剪土-结构相互作用的简化分析模型。在这个模型中,利用矩阵位移法的概念,同时考虑框架和剪力墙(筒体)的协同工作原理,将上部结构简化成平面的框架-剪力墙(筒体)结构,这一模型可以很好地模拟常用高层建筑体系的弯曲特性和弯剪特性。地基土采用一块在计算平面内高度为H,宽度为B,而在出平面方向厚度为t的土体作为分析模型,并对MSC.Marc进行了二次开发,将多层土E-B本构关系模型作为子程序嵌入其中,使用E-B本构关系模型来考虑它的非线性特性,利用粘-弹性人工边界作为地基土的边界条件。用接触迭代算法考虑了桩、箱-土之间的相互作用。最后,采用本文的方法对某高层框剪建筑进行了分析,并与不考虑土-结构相互作用的地震反应分析结果进行了对比。通过算例,本文初步探讨了在土-结构相互作用模型中,考虑和不考虑桩-土间相互作用对结构地震反应的影响,并得到了一些结论,证明了本文方法的适用性。

In this paper, a simplified 2D soil-structure interaction analysis model of high-rise buildings is given on the basis of considering actual condition and mechanics behaviors of the superstructure, and base and foundation soil situation. In this model, the principle of coordination work between frame and shear wall （tube） is considered by using matrix displacement method. The superstructure is simplified to 2D frame-shear wall （tube） structure that can simulate flexible and flexible-shear characteristic of high-rise buildings. MSC.Marc is redeveloped so that the E-B constitutive relation model of multi-layer soil is embedded in. The nonlinear characteristic of foundation soil is taken into account by using the E-B constitutive relation model, and the boundary condition of foundation soil is simulated by adopting viscous-spring artificial boundary condition. Finally, a high-rise building has been analyzed as an example by,adopting the method. Our results are compared with those without considering soil-structure interaction. In addition, the influence on the seismic response of high-rise buildings from pile-soil interaction is discussed initially. A case study in this paper proves the validity of the method.