( 2 ) to cut down great calculation of assembling and disassembling of stiffness matrix in the nonlinear procedure , the initial stress method is introduced to resolve the nonlinear equations ( 2 )使用初应力法对非线性方程组进行迭代计算，避免了组装和分解总体刚度矩阵的繁杂而庞大的运算。
The mixed incremental iteration formulas by a linear programming algorithm for elasto - plastic contact problems are shown . secondly , main procedures of meshless methods are reviewed and discussed 介绍了一般弹塑性问题的解法，阐述了弹塑性接触问题的增量初应力-线性规划方法，给出了计算流程。
In allusion to cylindrical thin shell , how to describe the initial stress and analyze the effect brought by initial stress to piece ' s mechanical behavior are the problem this paper is to discuss 如何描述初应力，如何分析初应力对构件力学行为的影响。对于圆柱薄壳，本文就这些问题给出了讨论。
In chapter one , the raise of an ideology , studying about the deformation ' s rule attached to initial - stress configuration , the research history and actuality in domestic and overseas are narrated 本文第一章述评了初应力位形上附加变形规律研究工作这一思想的提出、研究历史及国内外研究现状。
An experimental study on 14 square cfst members with and without pre - stress in steel tube was carried out . a comparison of results calculated using this model shows good agreement with test results . 3 进行了14个有或无初应力的方钢管混凝土构件的试验研究，理论计算结果与试验结果吻合良好； 3
Small deformation behavior with initial stress or without initial stress has different control equations . the effects to structure ' s mechanical behavior caused by them are different , too 无初应力的小变形运动与附加于初应力位形上的小变形运动有不同的控制方程，它们对构件力学行为的影响也不相同。
An efg - fe coupling method is then presented and implemented . the validity and effectivity of the presented efg - fe coupling method is also verified through comparing the numerical solutions with theoretical ones 然后，将增量初应力-线性规划方法与无网格伽辽金-有限元耦合方法结合求解弹塑性接触问题。
So , the actual state of concrete filled steel tube on load is always that there is pre - stress in steel tube . these members are susceptible to the effects of pre - stress in the steel tube due to construction load 因此，就出现了在钢管和混凝土共同受荷前，空钢管就预先承受纵向压力(包括自重、施工荷载等) ，在钢管中产生了初应力。
According to the feature that residual stress does not change with pole , the program is compiled to deal with the difficulties in writing file when there are a great of elements 根据残余应力大小沿杆长方向不变的特点，用vb编写了残余应力转化程序。该程序解决了当单元量巨大时， ansys初应力文件编写困难的问题，且适用于各种截面类型的构件。
The feasibility of evaluating the pre - stress with the measured frequencies of a structure under external excitation , and the influence of the mean normal stress on the mechanical properties of a column was also discussed 第七章提出了用固有频率的测试评估预应力效果的思想，论证了其技术可行性。指出了钢管内填物的压力产生的初应力对临界压力的有利影响。
