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忽略杆件轴向变形可以使框架在动力分析中的自由度大为减少,但对于斜杆不好处理。本文引入轴向约束方程,并推导了有关公式,将轴向约束方程与“定位向量”相结合,简单而有效地解决了电算中忽略斜杆轴向变形的困难,同时又保留了处理正交框架传统方法中的优点。已用本法分别编制了平面和空间框架的静动力分析程序(TQ—16机、ALGOL语言),非独立位移的判别以及节点位移座标的编号,均能在程序中自动完成。
Ignoring the axial deformation of the bar can greatly reduce the degree of freedom of the frame in dynamic analysis, but it is not easy to handle the diagonal bar. In this paper, the axial constraint equation is introduced, and the related formulae are deduced. The axial constraint equation is combined with the “positioning vector” to solve the difficulty of neglecting the axial deformation of the slant rod in the calculation, and at the same time, The advantages of the traditional methods of the framework. The static and dynamic analysis program for plane and space frames (TQ-16 machine, ALGOL language) has been programmed by this method. The identification of non-independent displacement and the number of nodal displacement coordinates can be automatically completed in the program.