The research is carried on the drop of bending rigidness if bolted joint loose and the equivalent reduced mechanical model is established . the comparisons beween the finite element model and the reduced mechanical demonstrate that the reduced mechanical model is right 本文还对螺栓松动对杆件节点抗弯刚度折减进行了研究，建立了等效结构力学模型，计算表明等效模型是正确可行的。
Hi this paper , we consider the precise analysis of connections could be gained by the concept of semi - rigid , due to the development of computer . at the same time , the geometric nonlinear analysis is an important component in the ultimate design of steel frame 同时，考虑到在钢结构的极限状态分析中，尤其是对于承受很大重力荷载的高而窄的框架结构，几何非线性对结构力学分析的影响很大。
Based on the theory of analogy of structural mechanics and optimal control , the optimal induced norm - 2 of state feedback h control is shown to be the fundamental rayleigh quotient eigenvalue in structural vibration or euler stability problems 根据结构力学与最优控制的模拟理论，指出状态反馈h控制黎卡提方程中的最优参数2 ，实质上就是结构振动或稳定理论中的瑞利商最小本征值。
Experience formula is applicable for some small and low precision - requested assembly fixture , for some complicated and large scale ones , fem for space frame is requested . at the end , an example based on this system has been given 即对于结构简单、精度要求不高的部装型架，采用材料力学和结构力学理论公式进行刚度校核；对于总装等结构复杂，精度要求高的大型型架，采用空间刚架的有限元分析。
Abstract : in compliance with the theories of structural mechanics , and in consideration of all factors that may influence vehicle impact , two new concepts , i . e . road condition factor and amplification factor of impact dynamics are proposed 文摘:从结构力学的理论出发，考虑影响车辆冲击力的各种因素，提出了路况系数和冲击动力放大系数两个新概念；克服了目前简单确定冲击系数和直线中插确定冲击力的弊端。
Abstract : based on the theory of analogy of structural mechanics and optimal control , the optimal induced norm - 2 of state feedback h control is shown to be the fundamental rayleigh quotient eigenvalue in structural vibration or euler stability problems 文摘:根据结构力学与最优控制的模拟理论，指出状态反馈h控制黎卡提方程中的最优参数2 ，实质上就是结构振动或稳定理论中的瑞利商最小本征值。
The element is then used to analyse an irregular shaped cavity . a semi - analytic method , in which the derivatives of stiffness matrix and mass matrix are obtained by the difference technique , for sensitivity analysis in dynamic shape optimization is presented in this dissertation 本文采用基于局部差分的半解析算法，进行特征值的灵敏度分析，并将计算结果提供给结构力学分析模块，实现了空腔声学的有限元分析和灵敏度计算。
As a consequence , the safe coefficient has to be considered according to the result of the calculations when designing . this inevitably makes the structure more redundant than it ought to be . what ' s more , materials are wasted by this design method 随着计算机技术的飞速发展，使得有限元分析计算方法得到了广泛的使用，涉及航空航天，土木，水利，造船及机械工程等各领域，用来进行结构力学分析，流体力学分析，热传导和电磁分析。
The present packing must manifest the culture , the designer must more understandings packing vessel structure mechanics , the packing content attribute , want to know well the content behind the cultural inside story , must reasonably mix each kind of resources to manifest " the ritual " the character 礼品包装要体现文化性，设计师则要更多了解包装容器的结构力学，包装内容物的属性，要谙熟内容物背后的文化底蕴，要合理调配各种资源以体现“礼”字。
Traditionally , loads of the arc gate are applied on the support or gate frusta as a set of concentrated load , but the effect range of such load on the frusta cannot be solved by material mechanics and structure mechanics . most of the load cases are fulfilled through optic - elastic test 通常弧门荷载作为一组集中荷载作用于牛腿或闸墩上，而这组荷载对闸墩受力的影响范围材料力学方法和结构力学方法是不能解决的，受力状况大部分是通过光弹试验完成。
