The influence of cross - correlations among three pairs of soil parameters on the reliability of reinforced retaining wall under various destructive models is discussed in this chapter . the three pairs of soil parameters are ( 1 ) the cohesion and friction angle , ( 2 ) the friction coefficient between fill and geotexile , and friction angle , and ( 3 ) the friction coefficient between fill and ground , and friction angle . the decision making of the reinforced retaining wall is carried on based on reliability theory by taking the minimum cost as the target 第四章对加筋土挡墙可靠性分析中有关参数的概率特性进行分析,以某加筋土挡墙为例,采用一次二阶矩法对筋材抗拉、抗拔,挡墙整体抗倾、抗滑和地基承载力进行可靠性分析,并对两种加筋方案情况下加筋土挡墙的可靠性进行分析比较;进行土性参数对可靠指标的敏感性分析;分析三对土性参数的互相关性,即土的粘聚力和内摩擦角、填土与筋材的摩擦系数和填土内摩擦角、填土与地基的摩擦系数和填土内摩擦角之间的互相关性对加筋土挡墙不同破坏模式可靠指标的影响。
Some interface contact models of soil - structure and resolution principles of contact element in universal fem program are introduced . considering the energy dissipation between soil and the box foundation , a modified three dimension goodman contact element is presented , and its element stiffness matrix is derivated . also , some seismic response analysis which in different max acceleration features are presented by using spring in marc program for simulating the modified contact element 4 、介绍了目前几种土与结构接触面常用的界面模型,以及一些大型通用有限元软件的接触单元计算原理,然后在前人研究的基础上考虑土-箱基动力相互作用中的能量耗散,计入阻尼成分,提出了一种改进的goodman三维土-箱基接触单元,并推导了相应的接触单元的单元刚度矩阵。
The columns internal forces of a 12 - storey rc frame with and without support loss are investigated by using three dimension finite element method considering soil - structure interaction . the support loss is expressed by soil voids , which are set up as 10 different sizes and locations . results of the study indicate that the effect of support loss on the columns axial forces changes little ， the influences of bending moments of the frame columns are substantial . with the stories increase and the voids sizes enlarge and the voids location are far away from the foundation , the influences for the bending moments lessens gradually 利用有限元法，通过对一栋12层钢筋混凝土框架结构在10种地基土支承损失条件下,土与上部结构协同工作的三维分析，探讨了框架柱内力变化的基本趋势.结果表明，支承损失对柱子轴力影响很小，对弯矩值的影响较大；但随着楼层的增高和表示地基土支承损失的土中孔洞尺寸的减小，以及其所在位置与基础地面距离的加大,对柱弯矩的影响逐渐减小
The article is divided into five chapters , as follows : 1 . with the review of development which about theory research on soil - structure dynamic interaction , various analysis methods and applications , exceptionally for the research history of soil - foundation contact interface are introduced . the work in this paper is based on former researches 本文共分五章,分别作了如下工作: 1 、回顾了土与结构动力相互作用的理论研究工作的发展历史,各种分析方法的特点及应用情况,并特别介绍了土与结构界面模型的研究历史,本文的研究正是在前人的这些工作基础上展开的。
