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本文提出一种以机动体系作为基本结构来分析有侧移刚架的方法。这种方法是将刚架中所有刚性结点全部用铰结点代出,使之成为一个几何可变的机动体系并以之作为基本结构。当将原来刚架的实际变形分解成为由直线段组成的线位移部分及由曲线段组成的角位移部分时,便可用基本结构(一)表达直线段位移部分,用基本结构(二)表达曲线段位移部分。通过利用虚位移原理及已知相邻杆件间相对转角为零的已知条件建立解求未知量的关系式。基本结构(一)、(二)虽然不能单独存立,但将它们“联立”起来后还是能用来进行分析的。
This paper proposes a method that uses the maneuvering system as the basic structure to analyze the rigid frame. In this method, all the rigid nodes in the rigid frame are replaced with hinge points to make it a geometrically variable maneuver system and use it as the basic structure. When the actual deformation of the original rigid frame is decomposed into a linear displacement portion composed of straight line segments and an angular displacement portion composed of curved line segments, the basic structure (1) can be used to express the displacement of the straight line segment, and the basic structure (2) expresses the curve. Segment displacement. The equation for solving the unknown is established by using the principle of virtual displacement and the known condition that the relative rotation angle between adjacent bars is known to be zero. Although the basic structures (a) and (b) cannot stand alone, they can be used for analysis after they are “aligned” together.