换铰法确定结点线位移数的研究

针对用换铰法确定位移法中独立的未知结点线位移时遇到的问题，提出了对定向支座的换铰处理方法，论证了与杆轴平行的链杆支座、定向支座处的线位移不必作为位移法独立的未知结点线位移，与杆轴垂直或斜交的链杆支座、定向支座处的线位移一般要作为位移法独立的未知结点线位移，总结出了用换铰法确定位移法中独立的未知结点线位移的简单计算公式，使得换铰法不再受边界条件的限制，并通过实例计算得以验证。

Research on Changing- hinge's Analysis Method Determining the Number of Node Linear Displacement

The method of dealing with the hinge for directional supports has been put forward while making use of the changing - hinge' s analysis method to determine the unattached unknown node linear displacement of displacement method. It is proved that the linear displacement of linking bar supports and directional support paralleled the bar axis should not regard the unattached unknown node linear displacement of displacement method, and the linear displacement of linking bar supports and directional support un - paralleled the bar axis should regard the unattached unknown node linear displacement. The simple calculation formulas of determining the unattached unknown node linear displacement by the changing-hinge' s analysis method have been summarized. The changing - hinge' s analysis method has not confined to the boundary condition in this paper, the correctness of the formulas has been validated by some examples.