自由场边界的ABAQUS开发及其在隧道结构动力分析中的应用

发布时间：2018-03-11 04:06

  本文选题：山岭隧道　切入点：数值模拟　出处：《西南交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国西部开发的不断推进,大量的隧道工程被修建在西部高烈度地震区,从国内外的历次大地震中可以看出,山岭隧道在强震作用下也会发生严重破坏,因此开展强震作用下山岭隧道抗减震方面的研究己成为目前科学界和工程界的热门课题之一。基于此背景,本文以ABAQUS大型有限元软件为平台,开发了地震动计算中的自由场边界,并通过数值模拟的方法对山岭隧道结构在地震动作用下的损伤演化进行了初步分析,具体研究内容如下：(1)对ABAQUS动力有限元分析的基本理论进行介绍。着重介绍了直接积分中的隐式积分法、非线性求解时所采用的Newton-Raphson法；然后对ABAQUS中的混凝土塑性损伤本构模型进行了介绍；(2)对近场波动数值模拟中的关键问题：动力人工边界和地震动输入,进行了详细介绍,对几种常见的动力人工边界及其相应的地震动输入方法进行了推导,从而明确了动力问题数值计算的关键内容；(3)基于有限元方法的基本思路,将粘性边界和自由场地震动输入相耦合,推导得到了自由场边界单元的力学性质,然后利用Fortran语言,通过ABAQUS软件的UEL二次开发接口,实现了自由场边界单元的程序开发,最后以算例的形式对自由场边界单元的模拟效果进行了验证；(4)结合汶川地震中隧道结构破坏情况,采用数值模拟的方法,对隧道结构在强震下的损伤演化过程进行了分析,得到水平剪切波和竖向压缩波分别作用下隧道结构的渐进性破坏过程,明确了不同波型下隧道结构的薄弱部位和破坏特征。
[Abstract]:With the continuous development of western China, a large number of tunnel projects have been built in the high intensity earthquake areas in the west of China. It can be seen from all the major earthquakes at home and abroad that the mountain tunnels will also be seriously damaged under the action of strong earthquakes. Therefore, it has become one of the hot topics in the scientific and engineering fields to study the earthquake resistance of mountain tunnel under strong earthquake. Based on this background, this paper takes ABAQUS large-scale finite element software as the platform. The free field boundary in the calculation of ground motion is developed, and the damage evolution of mountain tunnel structure under the action of ground motion is analyzed preliminarily by means of numerical simulation. The main contents of this paper are as follows: (1) the basic theory of ABAQUS dynamic finite element analysis is introduced. The implicit integral method in direct integration and the Newton-Raphson method in nonlinear solution are introduced. Then the plastic damage constitutive model of concrete in ABAQUS is introduced. The key problems in numerical simulation of near-field wave are introduced in detail: dynamic artificial boundary and ground motion input. In this paper, several common dynamic artificial boundaries and their corresponding seismic input methods are derived, and the key content of numerical calculation of dynamic problems is clarified. The mechanical properties of the free field boundary element are derived by coupling the viscous boundary and the vibration input of the free site. Then the program development of the free field boundary element is realized by using Fortran language and the UEL secondary development interface of ABAQUS software. Finally, the simulation results of free field boundary element are verified by a numerical example. Combined with the failure of tunnel structure in Wenchuan earthquake, the damage evolution process of tunnel structure under strong earthquake is analyzed by numerical simulation. The progressive failure process of tunnel structure under the action of horizontal shear wave and vertical compression wave is obtained, and the weak position and failure characteristics of tunnel structure under different wave patterns are clarified.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451
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本文编号：1596482