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本文以弹性体功的互等原理为基础,提出了用强迫变位法计算空间结构中板、梁内力影响面的基本原理。文中给出了空间杆单元杆端发生单位强迫变形时单元等效节点力的计算方法;在薄板计算中引入了强迫应变盒的概念,导出了应变盒在某力素方向上发生单位面积强迫应变时单元的等效节点力计算公式,还对影响面坐标加密等问题作了讨论,实现了空间结构内力影响面的有限元计算。
Based on the principle of mutual equivalence of elastic body work, this paper proposes the basic principle of using forced displacement method to calculate the influence surface of the internal forces of plates and beams in spatial structures. In this paper, the calculation method of unit equivalent nodal force is given when unit forced deformation occurs at the end of the space bar element. The concept of forced strain box is introduced in the calculation of thin plate and the force strain per unit area in the force direction of the strain cell is derived. The equivalent node force calculation formula of the time unit is also discussed, and the influence of surface coordinate encryption and other issues are also discussed, and the finite element calculation of the internal force influence surface of the spatial structure is realized.