In addition , based on the analysis of several factors including the single - double - layer span ratios , the height - to - span ratios and the pipe types , the nonlinear analysis gives important suggestion to engineering application 同时考虑了几何非线性的影响,在几何非线性的影响下分析结构随跨度、矢跨比、网格频数等参数受地震荷载的响应情况,对工程应用提出有科学价值的建议。
The aim to study the system structure is to have better understanding , description and control of the complex system . the current studies focus on the system structure in a general way rather than differentiate the inner structure from the analytic structure of a system 结合复杂系统特征和认知的阶段与层次,本文在分析ahp和anp内在作用机制的基础上分别给出了系统分析结构表达的方法即具有隐含层的分析结构。
As is seen , the understanding and description of a system is the basis to solve problems . the understanding of the system structure is so important that the analysis of the system structure is the primary task in analyzing the decision making of a complex system 然后,根据认知过程的特点将认知过程划分为问题识别、概念化、形式表示和测试四个阶段,并在不同的阶段划分了认知的层次,指出界定分析结构的原则和专家在分析结构界定中的重要作用。
Abstract : based on spline function method , the spline finite element formulation for the contact - impact problems is proposed . in order to get the formulation , the b3 spline function is used to distribute the contact problem , and numerical examples are analyzed to show the effectiveness of the method . because the spline function has double characteristics including analytical and numerical , and good continuity and high correctness , a little unknown number and high efficiency , the spline functions are used to set the displacement of the bar , and the whole structure equations are constructed directly . it is convenient to analyze dynamic response of the structure by using the method 文摘:用样条有限元法分析了杆的接触冲击动力响应问题,建立了计算格式,并用算例说明该方法的有效性.该方法充分利用了样条函数的解析和数值双重性及连续性强的优点来构造杆的位移函数,因此可推广应用于分析结构在冲击荷载下的动力响应问题
The work of this dissertation is mainly as follows : 1 . systemically introduce and evaluate the advance of studies on damage models of reinforced concrete on material , member and structure level ; 2 . by inputing earthquake wave for member model , analyse dissipating energy process and development process of structure damage and discuss relation between structure damage and pga , time of earthquake motion 本文的主要内容如下: 1 )系统地总结当前钢筋混凝土损伤理论在基于材料、构件和结构层次的研究进展及其评价; 2 )通过杆系模型对结构输入实际地震动,分析结构在地震作用下能量耗散过程以及结构损伤的发展过程,并讨论结构损伤和地震动三要素(主要是加速度和持时)的关系。