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对于水平荷载作用下的顶横梁为绝对刚性的两层多跨框架,使用武藤清D值法计算,误差甚大,不能满足工程使用要求。本文针对这类框架,建立了关于D值、反弯点高度比、柱剪力、荷载比及侧移的基本关系式;提出了求解一组关系式的迭代方法;分析了荷载比对D值的影响;给出了计算框架内力与侧移的方法步骤。文中算例,计算结果接近精确解,精度较武氏D值法高出很多。本文方法可用于矩形筒仓支承框架的结构分析。
For the two-story multi-span frame with absolute rigidity under the horizontal load, using the Wu Tengqing D-value method to calculate, the error is very large and can not meet the engineering requirements. In this paper, the basic relational expressions of D value, ratio of anti-bending point height, column shear force, load ratio and lateral displacement are established for this type of framework; an iterative method for solving a set of relational equations is proposed; and the load ratio D is analyzed. The influence of the method; the method steps for calculating the internal force and lateral displacement of the frame are given. In this paper, the calculation results are close to the exact solution, and the accuracy is much higher than the Wu’s D value method. This method can be used for structural analysis of rectangular silo support frames.