In the process , we import the displacement method " s concept of replacement ahead , that is to say , we replace the unknown vectors with new unknown vectors to prevent the delivering and accumulation of errors . at the same time , we completed the skew bridge calculation procedure , and compared the calculation results with the results by the finite element software ansys , it proved the correctness and practicality of this procedure 在矩阵传递的过程中引入位移法中的前进代入的概念，即将未知向量不断的以新的未知向量替换，以防止误差的传递和积累。本文完成了斜交格子梁桥的内力计算程序，并将计算结果与采用有限元分析软件ansys分析计算的结果进行了比较，验证了程序的正确性和实用性。
The cad system of prestressed concrete cassion beam is given in detail in this thesis including two parts as follows . ( 1 ) inner - forces analysis : in this section , the inner - forces were analyzed by matrix - displacement method . ( 2 ) design computation : in this section , the number of prestressed bars and steel reinforcements were calculated by load - balancing method 本文详细的论述了预应力混凝土井字梁计算机辅助设计系统的设计计算原理，用矩阵位移法进行内力分析，用荷载平衡法计算预应力混凝土井字梁的预应力筋、非预应力筋，然后进行抗剪、抗扭计算和使用阶段验算。
Third , a very useful colored cfi - interferometry is developed . as the result of the presence of shockwaves , or because of the spots of light , scattering , diffraction and other phenomena hiding the information searched in the experiment , discontinuities of the fringes are found in the interferogram of high - velocity gas flows . colored cfi - interferometry is a powerful tool to overcome these problems 对于含激波的干涉图的处理一直是个难题，试验干涉图在密度梯度很大的地方即使放大图像也不满足采样条件，使通过干涉条纹的连接很难判断，无论是用条纹位移法还是相位主值解调法都很难进行处理，通过彩色计算干涉技术可以帮助判断试验干涉图中过激波条纹的连续性。
