一类平面静定桁架内力的虚位移原理求解

Internal Forces Computation by Principle of Virtual Displacement for a Class of Planar Determinant Trusses

基于一个静定平面桁架问题,提出利用虚位移原理求解该问题时有关虚位移计算的一个新命题,并严格给出了该命题的证明,列出了对应于特殊情况下的一个推论,并利用该命题正确求解了该结构静力学问题.该命题丰富了虚位移原理的应用,为在满足特定条件下虚位移的计算以及静力学问题的求解奠定了基础.

A proposition on computing virtual displacements of a rigid body by which can be used to solve member’s internal forces of planar determinant trusses is proposed,and the procedure of proving this proposition is given out.A corollary corresponding to a specific case is listed.This proposition enriches the application of the virtual displacement principle,and sets a foundation for solving the problems of statics under the specific cases.